android/camera/VideoCamera.java

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.android.camera;

import com.android.camera.gallery.IImage;
import com.android.camera.gallery.IImageList;

import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.BroadcastReceiver;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.os.StatFs;
import android.os.SystemClock;
import android.preference.PreferenceManager;
import android.provider.MediaStore;
import android.provider.MediaStore.Video;
import android.text.format.DateFormat;
import android.util.Log;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SurfaceHolder;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.view.MenuItem.OnMenuItemClickListener;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.FileDescriptor;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;

/**
 * The Camcorder activity.
 */
public class VideoCamera extends Activity implements View.OnClickListener,
        ShutterButton.OnShutterButtonListener, SurfaceHolder.Callback,
        MediaRecorder.OnErrorListener, MediaRecorder.OnInfoListener {

    private static final String TAG = "videocamera";

    private static final int INIT_RECORDER = 3;
    private static final int CLEAR_SCREEN_DELAY = 4;
    private static final int UPDATE_RECORD_TIME = 5;

    private static final int SCREEN_DELAY = 2 * 60 * 1000;

    private static final long NO_STORAGE_ERROR = -1L;
    private static final long CANNOT_STAT_ERROR = -2L;
    private static final long LOW_STORAGE_THRESHOLD = 512L * 1024L;

    private static final int STORAGE_STATUS_OK = 0;
    private static final int STORAGE_STATUS_LOW = 1;
    private static final int STORAGE_STATUS_NONE = 2;

    public static final int MENU_SETTINGS = 6;
    public static final int MENU_GALLERY_PHOTOS = 7;
    public static final int MENU_GALLERY_VIDEOS = 8;
    public static final int MENU_SAVE_GALLERY_PHOTO = 34;
    public static final int MENU_SAVE_PLAY_VIDEO = 35;
    public static final int MENU_SAVE_SELECT_VIDEO = 36;
    public static final int MENU_SAVE_NEW_VIDEO = 37;

    SharedPreferences mPreferences;

    private static final float VIDEO_ASPECT_RATIO = 176.0f / 144.0f;
    VideoPreview mVideoPreview;
    SurfaceHolder mSurfaceHolder = null;
    ImageView mVideoFrame;

    private boolean mIsVideoCaptureIntent;
    // mLastPictureButton and mThumbController
    // are non-null only if mIsVideoCaptureIntent is true.
    private ImageView mLastPictureButton;
    private ThumbnailController mThumbController;

    private int mStorageStatus = STORAGE_STATUS_OK;

    private MediaRecorder mMediaRecorder;
    private boolean mMediaRecorderRecording = false;
    private long mRecordingStartTime;
    // The video file that the hardware camera is about to record into
    // (or is recording into.)
    private String mCameraVideoFilename;
    private FileDescriptor mCameraVideoFileDescriptor;

    // The video file that has already been recorded, and that is being
    // examined by the user.
    private String mCurrentVideoFilename;
    private Uri mCurrentVideoUri;
    private ContentValues mCurrentVideoValues;

    // The video frame size we will record (like 352x288).
    private int mVideoWidth, mVideoHeight;

    // The video duration limit.
    private int mMaxVideoDurationInMs;

    boolean mPausing = false;
    boolean mPreviewing = false; // True if preview is started.
    boolean mRecorderInitialized = false;

    private ContentResolver mContentResolver;

    private ShutterButton mShutterButton;
    private TextView mRecordingTimeView;
    private boolean mRecordingTimeCountsDown = false;

    ArrayList<MenuItem> mGalleryItems = new ArrayList<MenuItem>();

    private final Handler mHandler = new MainHandler();

    // This Handler is used to post message back onto the main thread of the
    // application
    private class MainHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {

                case CLEAR_SCREEN_DELAY: {
                    clearScreenOnFlag();
                    break;
                }

                case UPDATE_RECORD_TIME: {
                    updateRecordingTime();
                    break;
                }

                case INIT_RECORDER: {
                    initializeRecorder();
                    break;
                }

                default:
                    Log.v(TAG, "Unhandled message: " + msg.what);
                    break;
            }
        }
    }

    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (action.equals(Intent.ACTION_MEDIA_EJECT)) {
                updateAndShowStorageHint(false);
                stopVideoRecording();
            } else if (action.equals(Intent.ACTION_MEDIA_MOUNTED)) {
                updateAndShowStorageHint(true);
                mRecorderInitialized = false;
                initializeRecorder();
            } else if (action.equals(Intent.ACTION_MEDIA_UNMOUNTED)) {
                // SD card unavailable
                // handled in ACTION_MEDIA_EJECT
            } else if (action.equals(Intent.ACTION_MEDIA_SCANNER_STARTED)) {
                Toast.makeText(VideoCamera.this, getResources().getString(R.string.wait), 5000);
            } else if (action.equals(Intent.ACTION_MEDIA_SCANNER_FINISHED)) {
                updateAndShowStorageHint(true);
            }
        }
    };

    private static String createName(long dateTaken) {
        return DateFormat.format("yyyy-MM-dd kk.mm.ss", dateTaken).toString();
    }

    /** Called with the activity is first created. */
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        /*
         * To reduce startup time, we open camera device in another thread.
         * Camera is opened in onCreate instead of onResume because there are
         * lots of things to do here and camera open can be done in parallel. We
         * will make sure the camera is opened at the end of onCreate.
         */
        Thread openCameraThread = new Thread(new Runnable() {
            public void run() {
                mCameraDevice = CameraHolder.instance().open();
            }
        });
        openCameraThread.start();

        mPreferences = PreferenceManager.getDefaultSharedPreferences(this);
        mContentResolver = getContentResolver();

        requestWindowFeature(Window.FEATURE_PROGRESS);
        setContentView(R.layout.video_camera);

        mVideoPreview = (VideoPreview) findViewById(R.id.camera_preview);
        mVideoPreview.setAspectRatio(VIDEO_ASPECT_RATIO);

        // don't set mSurfaceHolder here. We have it set ONLY within
        // surfaceCreated / surfaceDestroyed, other parts of the code
        // assume that when it is set, the surface is also set.
        SurfaceHolder holder = mVideoPreview.getHolder();
        holder.addCallback(this);
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        mIsVideoCaptureIntent = isVideoCaptureIntent();
        mRecordingTimeView = (TextView) findViewById(R.id.recording_time);
        mVideoFrame = (ImageView) findViewById(R.id.video_frame);

        ViewGroup rootView = (ViewGroup) findViewById(R.id.video_camera);
        LayoutInflater inflater = this.getLayoutInflater();
        if (!mIsVideoCaptureIntent) {
            View controlBar = inflater.inflate(R.layout.camera_control, rootView);
            mLastPictureButton = (ImageView) controlBar.findViewById(R.id.review_thumbnail);
            mThumbController = new ThumbnailController(mLastPictureButton, mContentResolver);
            mLastPictureButton.setOnClickListener(this);
            mThumbController.loadData(ImageManager.getLastVideoThumbPath());
            findViewById(R.id.camera_switch).setOnClickListener(this);
        } else {
            View controlBar = inflater.inflate(R.layout.attach_camera_control, rootView);
            controlBar.findViewById(R.id.btn_cancel).setOnClickListener(this);
            controlBar.findViewById(R.id.btn_retake).setOnClickListener(this);
            controlBar.findViewById(R.id.btn_play).setOnClickListener(this);
            controlBar.findViewById(R.id.btn_done).setOnClickListener(this);
        }

        mShutterButton = (ShutterButton) findViewById(R.id.shutter_button);
        mShutterButton.setImageResource(R.drawable.btn_ic_video_record);
        mShutterButton.setOnShutterButtonListener(this);
        mShutterButton.requestFocus();

        // Make sure the camera is opened.
        try {
            openCameraThread.join();
        } catch (InterruptedException ex) {
            // ignore
        }
    }

    private void startShareVideoActivity() {
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_SEND);
        intent.setType("video/3gpp");
        intent.putExtra(Intent.EXTRA_STREAM, mCurrentVideoUri);
        try {
            startActivity(Intent.createChooser(intent, getText(R.string.sendVideo)));
        } catch (android.content.ActivityNotFoundException ex) {
            Toast.makeText(VideoCamera.this, R.string.no_way_to_share_video, Toast.LENGTH_SHORT)
                    .show();
        }
    }

    private void startPlayVideoActivity() {
        Intent intent = new Intent(Intent.ACTION_VIEW, mCurrentVideoUri);
        try {
            startActivity(intent);
        } catch (android.content.ActivityNotFoundException ex) {
            Log.e(TAG, "Couldn't view video " + mCurrentVideoUri, ex);
        }
    }


    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_retake:
                discardCurrentVideoAndInitRecorder();
                break;
            case R.id.camera_switch:
                MenuHelper.gotoCameraMode(this);
                break;
            case R.id.btn_play:
                startPlayVideoActivity();
                break;
            case R.id.btn_done:
                doReturnToCaller(true);
                break;
            case R.id.btn_cancel:
                stopVideoRecording();
                doReturnToCaller(false);
                break;
            case R.id.discard: {
                Runnable deleteCallback = new Runnable() {
                    public void run() {
                        discardCurrentVideoAndInitRecorder();
                    }
                };
                MenuHelper.deleteVideo(this, deleteCallback);
                break;
            }
            case R.id.share: {
                startShareVideoActivity();
                break;
            }
            case R.id.play: {
                doPlayCurrentVideo();
                break;
            }
            case R.id.review_thumbnail: {
                stopVideoRecordingAndShowReview();
                break;
            }
        }
    }

    public void onShutterButtonFocus(ShutterButton button, boolean pressed) {
        // Do nothing (everything happens in onShutterButtonClick).
    }

    public void onShutterButtonClick(ShutterButton button) {
        switch (button.getId()) {
            case R.id.shutter_button:
                if (mMediaRecorderRecording) {
                    if (mIsVideoCaptureIntent) {
                        stopVideoRecordingAndShowAlert();
                    } else {
                        stopVideoRecordingAndGetThumbnail();
                        mRecorderInitialized = false;
                        initializeRecorder();
                    }
                } else if (mRecorderInitialized) {
                    // If the click comes before recorder initialization, it is
                    // ignored. If users click the button during initialization,
                    // the event is put in the queue and record will be started
                    // eventually.
                    startVideoRecording();
                }
                break;
        }
    }

    private void doPlayCurrentVideo() {
        Log.v(TAG, "Playing current video: " + mCurrentVideoUri);
        Intent intent = new Intent(Intent.ACTION_VIEW, mCurrentVideoUri);
        try {
            startActivity(intent);
        } catch (android.content.ActivityNotFoundException ex) {
            Log.e(TAG, "Couldn't view video " + mCurrentVideoUri, ex);
        }
    }

    private void discardCurrentVideoAndInitRecorder() {
        deleteCurrentVideo();
        hideAlertAndInitializeRecorder();
    }

    private OnScreenHint mStorageHint;

    private void updateAndShowStorageHint(boolean mayHaveSd) {
        mStorageStatus = getStorageStatus(mayHaveSd);
        showStorageHint();
    }

    private void showStorageHint() {
        String errorMessage = null;
        switch (mStorageStatus) {
            case STORAGE_STATUS_NONE:
                errorMessage = getString(R.string.no_storage);
                break;
            case STORAGE_STATUS_LOW:
                errorMessage = getString(R.string.spaceIsLow_content);
        }
        if (errorMessage != null) {
            if (mStorageHint == null) {
                mStorageHint = OnScreenHint.makeText(this, errorMessage);
            } else {
                mStorageHint.setText(errorMessage);
            }
            mStorageHint.show();
        } else if (mStorageHint != null) {
            mStorageHint.cancel();
            mStorageHint = null;
        }
    }

    private int getStorageStatus(boolean mayHaveSd) {
        long remaining = mayHaveSd ? getAvailableStorage() : NO_STORAGE_ERROR;
        if (remaining == NO_STORAGE_ERROR) {
            return STORAGE_STATUS_NONE;
        }
        return remaining < LOW_STORAGE_THRESHOLD ? STORAGE_STATUS_LOW : STORAGE_STATUS_OK;
    }

    private void readVideoSizePreference() {
        boolean videoQualityHigh =
                getBooleanPreference(CameraSettings.KEY_VIDEO_QUALITY,
                        CameraSettings.DEFAULT_VIDEO_QUALITY_VALUE);

        // 1 minute = 60000ms
        mMaxVideoDurationInMs =
                60000 * getIntPreference(CameraSettings.KEY_VIDEO_DURATION,
                        CameraSettings.DEFAULT_VIDEO_DURATION_VALUE);

        Intent intent = getIntent();
        if (intent.hasExtra(MediaStore.EXTRA_VIDEO_QUALITY)) {
            int extraVideoQuality = intent.getIntExtra(MediaStore.EXTRA_VIDEO_QUALITY, 0);
            videoQualityHigh = (extraVideoQuality > 0);
        }

        if (videoQualityHigh) {
            // CIF size
            mVideoWidth = 352;
            mVideoHeight = 288;
        } else {
            // QCIF size
            mVideoWidth = 176;
            mVideoHeight = 144;
        }
    }

    @Override
    public void onResume() {
        super.onResume();
        mPausing = false;

        setScreenTimeoutLong();
        readVideoSizePreference();

        // install an intent filter to receive SD card related events.
        IntentFilter intentFilter = new IntentFilter(Intent.ACTION_MEDIA_MOUNTED);
        intentFilter.addAction(Intent.ACTION_MEDIA_EJECT);
        intentFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTED);
        intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_STARTED);
        intentFilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);
        intentFilter.addDataScheme("file");
        registerReceiver(mReceiver, intentFilter);
        mStorageStatus = getStorageStatus(true);

        mHandler.postDelayed(new Runnable() {
            public void run() {
                showStorageHint();
            }
        }, 200);

        if (mSurfaceHolder != null) {
            startPreview();
            mRecorderInitialized = false;
            mHandler.sendEmptyMessage(INIT_RECORDER);
        }
    }

    private void setCameraParameters() {
        android.hardware.Camera.Parameters param;
        param = mCameraDevice.getParameters();
        param.setPreviewSize(mVideoWidth, mVideoHeight);
        mCameraDevice.setParameters(param);
    }

    // Precondition: mSurfaceHolder != null
    private void startPreview() {
        Log.v(TAG, "startPreview");
        if (mPreviewing) {
            // After recording a video, preview is not stopped. So just return.
            return;
        }

        if (mCameraDevice == null) {
            // If the activity is paused and resumed, camera device has been
            // released and we need to open the camera.
            mCameraDevice = CameraHolder.instance().open();
        }

        setCameraParameters();
        try {
            mCameraDevice.setPreviewDisplay(mSurfaceHolder);
        } catch (Throwable ex) {
            closeCamera();
            throw new RuntimeException("setPreviewDisplay failed", ex);
        }

        try {
            mCameraDevice.startPreview();
            mPreviewing = true;
        } catch (Throwable ex) {
            closeCamera();
            throw new RuntimeException("startPreview failed", ex);
        }
        mCameraDevice.unlock();
    }

    private void closeCamera() {
        Log.v(TAG, "closeCamera");
        if (mCameraDevice == null) {
            Log.d(TAG, "already stopped.");
            return;
        }
        // If we don't lock the camera, release() will fail.
        mCameraDevice.lock();
        CameraHolder.instance().release();
        mCameraDevice = null;
        mPreviewing = false;
    }

    @Override
    public void onStop() {
        setScreenTimeoutSystemDefault();
        super.onStop();
    }

    @Override
    protected void onPause() {
        super.onPause();

        mPausing = true;

        // This is similar to what mShutterButton.performClick() does,
        // but not quite the same.
        if (mMediaRecorderRecording) {
            if (mIsVideoCaptureIntent) {
                stopVideoRecording();
                showAlert();
            } else {
                stopVideoRecordingAndGetThumbnail();
            }
        } else {
            stopVideoRecording();
        }
        closeCamera();

        unregisterReceiver(mReceiver);
        setScreenTimeoutSystemDefault();

        if (!mIsVideoCaptureIntent) {
            mThumbController.storeData(ImageManager.getLastVideoThumbPath());
        }

        if (mStorageHint != null) {
            mStorageHint.cancel();
            mStorageHint = null;
        }

        mHandler.removeMessages(INIT_RECORDER);
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        // Do not handle any key if the activity is paused.
        if (mPausing) {
            return true;
        }

        setScreenTimeoutLong();

        switch (keyCode) {
            case KeyEvent.KEYCODE_BACK:
                if (mMediaRecorderRecording) {
                    mShutterButton.performClick();
                    return true;
                }
                break;
            case KeyEvent.KEYCODE_CAMERA:
                if (event.getRepeatCount() == 0) {
                    mShutterButton.performClick();
                    return true;
                }
                break;
            case KeyEvent.KEYCODE_DPAD_CENTER:
                if (event.getRepeatCount() == 0) {
                    mShutterButton.performClick();
                    return true;
                }
                break;
            case KeyEvent.KEYCODE_MENU:
                if (mMediaRecorderRecording) {
                    mShutterButton.performClick();
                    return true;
                }
                break;
        }

        return super.onKeyDown(keyCode, event);
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        switch (keyCode) {
            case KeyEvent.KEYCODE_CAMERA:
                mShutterButton.setPressed(false);
                return true;
        }
        return super.onKeyUp(keyCode, event);
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
        // Make sure we have a surface in the holder before proceeding.
        if (holder.getSurface() == null) {
            Log.d(TAG, "holder.getSurface() == null");
            return;
        }

        if (mPausing) {
            // We're pausing, the screen is off and we already stopped
            // video recording. We don't want to start the camera again
            // in this case in order to conserve power.
            // The fact that surfaceChanged is called _after_ an onPause appears
            // to be legitimate since in that case the lockscreen always returns
            // to portrait orientation possibly triggering the notification.
            return;
        }

        if (mMediaRecorderRecording) {
            stopVideoRecording();
        }

        // Start the preview if it is not started yet. Preview may be already
        // started in onResume and then surfaceChanged is called due to
        // orientation change.
        if (!mPreviewing) {
            startPreview();
            mRecorderInitialized = false;
            mHandler.sendEmptyMessage(INIT_RECORDER);
        }
    }

    public void surfaceCreated(SurfaceHolder holder) {
        mSurfaceHolder = holder;
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        mSurfaceHolder = null;
    }

    private void gotoGallery() {
        MenuHelper.gotoCameraVideoGallery(this);
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        super.onPrepareOptionsMenu(menu);

        for (int i = 1; i <= MenuHelper.MENU_ITEM_MAX; i++) {
            if (i != MenuHelper.GENERIC_ITEM) {
                menu.setGroupVisible(i, false);
            }
        }

        menu.setGroupVisible(MenuHelper.VIDEO_MODE_ITEM, true);
        return true;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);

        if (mIsVideoCaptureIntent) {
            // No options menu for attach mode.
            return false;
        } else {
            addBaseMenuItems(menu);
            int menuFlags =
                    MenuHelper.INCLUDE_ALL & ~MenuHelper.INCLUDE_ROTATE_MENU
                            & ~MenuHelper.INCLUDE_DETAILS_MENU;
            MenuHelper.addImageMenuItems(menu, menuFlags, false, VideoCamera.this, mHandler,
            // Handler for deletion
                    new Runnable() {
                        public void run() {
                            // What do we do here?
                            // mContentResolver.delete(uri, null, null);
                        }
                    }, new MenuHelper.MenuInvoker() {
                        public void run(final MenuHelper.MenuCallback cb) {
                        }
                    });

            MenuItem gallery =
                    menu.add(MenuHelper.IMAGE_SAVING_ITEM, MENU_SAVE_GALLERY_PHOTO, 0,
                            R.string.camera_gallery_photos_text).setOnMenuItemClickListener(
                            new MenuItem.OnMenuItemClickListener() {
                                public boolean onMenuItemClick(MenuItem item) {
                                    gotoGallery();
                                    return true;
                                }
                            });
            gallery.setIcon(android.R.drawable.ic_menu_gallery);
        }
        return true;
    }

    private boolean isVideoCaptureIntent() {
        String action = getIntent().getAction();
        return (MediaStore.ACTION_VIDEO_CAPTURE.equals(action));
    }

    private void doReturnToCaller(boolean success) {
        Intent resultIntent = new Intent();
        int resultCode;
        if (success) {
            resultCode = RESULT_OK;
            resultIntent.setData(mCurrentVideoUri);
        } else {
            resultCode = RESULT_CANCELED;
        }
        setResult(resultCode, resultIntent);
        finish();
    }

    /**
     * Returns
     *
     * @return number of bytes available, or an ERROR code.
     */
    private static long getAvailableStorage() {
        try {
            if (!ImageManager.hasStorage()) {
                return NO_STORAGE_ERROR;
            } else {
                String storageDirectory = Environment.getExternalStorageDirectory().toString();
                StatFs stat = new StatFs(storageDirectory);
                return ((long) stat.getAvailableBlocks() * (long) stat.getBlockSize());
            }
        } catch (RuntimeException ex) {
            // if we can't stat the filesystem then we don't know how many
            // free bytes exist. It might be zero but just leave it
            // blank since we really don't know.
            return CANNOT_STAT_ERROR;
        }
    }

    private void cleanupEmptyFile() {
        if (mCameraVideoFilename != null) {
            File f = new File(mCameraVideoFilename);
            if (f.length() == 0 && f.delete()) {
                Log.v(TAG, "Empty video file deleted: " + mCameraVideoFilename);
                mCameraVideoFilename = null;
            }
        }
    }

    private android.hardware.Camera mCameraDevice;

    // initializeRecorder() prepares media recorder. Return false if fails.
    private boolean initializeRecorder() {
        Log.v(TAG, "initializeRecorder");
        if (mRecorderInitialized) return true;

        // We will call initializeRecorder() again when the alert is hidden.
        if (isAlertVisible()) {
            return false;
        }

        Intent intent = getIntent();
        Bundle myExtras = intent.getExtras();

        if (mIsVideoCaptureIntent && myExtras != null) {
            Uri saveUri = (Uri) myExtras.getParcelable(MediaStore.EXTRA_OUTPUT);
            if (saveUri != null) {
                try {
                    mCameraVideoFileDescriptor =
                            mContentResolver.openFileDescriptor(saveUri, "rw").getFileDescriptor();
                    mCurrentVideoUri = saveUri;
                } catch (java.io.FileNotFoundException ex) {
                    // invalid uri
                    Log.e(TAG, ex.toString());
                }
            }
        }
        releaseMediaRecorder();

        mMediaRecorder = new MediaRecorder();

        mMediaRecorder.setCamera(mCameraDevice);
        mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mMediaRecorder.setMaxDuration(mMaxVideoDurationInMs);

        if (mStorageStatus != STORAGE_STATUS_OK) {
            mMediaRecorder.setOutputFile("/dev/null");
        } else {
            // We try Uri in intent first. If it doesn't work, use our own
            // instead.
            if (mCameraVideoFileDescriptor != null) {
                mMediaRecorder.setOutputFile(mCameraVideoFileDescriptor);
            } else {
                createVideoPath();
                mMediaRecorder.setOutputFile(mCameraVideoFilename);
            }
        }

        // Use the same frame rate for both, since internally
        // if the frame rate is too large, it can cause camera to become
        // unstable. We need to fix the MediaRecorder to disable the support
        // of setting frame rate for now.
        mMediaRecorder.setVideoFrameRate(20);
        mMediaRecorder.setVideoSize(mVideoWidth, mVideoHeight);
        mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H263);
        mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
        mMediaRecorder.setPreviewDisplay(mSurfaceHolder.getSurface());

        long remaining = getAvailableStorage();
        // remaining >= LOW_STORAGE_THRESHOLD at this point, reserve a quarter
        // of that to make it more likely that recording can complete
        // successfully.
        try {
            mMediaRecorder.setMaxFileSize(remaining - LOW_STORAGE_THRESHOLD / 4);
        } catch (RuntimeException exception) {
            // We are going to ignore failure of setMaxFileSize here, as
            // a) The composer selected may simply not support it, or
            // b) The underlying media framework may not handle 64-bit range
            // on the size restriction.
        }

        try {
            mMediaRecorder.prepare();
        } catch (IOException exception) {
            Log.e(TAG, "prepare failed for " + mCameraVideoFilename);
            releaseMediaRecorder();
            // TODO: add more exception handling logic here
            return false;
        }
        mMediaRecorderRecording = false;

        // Update the last video thumbnail.
        if (!mIsVideoCaptureIntent) {
            if (!mThumbController.isUriValid()) {
                updateLastVideo();
            }
            mThumbController.updateDisplayIfNeeded();
        }
        mRecorderInitialized = true;
        return true;
    }

    private void releaseMediaRecorder() {
        Log.v(TAG, "Releasing media recorder.");
        if (mMediaRecorder != null) {
            cleanupEmptyFile();
            mMediaRecorder.reset();
            mMediaRecorder.release();
            mMediaRecorder = null;
        }
    }

    private int getIntPreference(String key, int defaultValue) {
        String s = mPreferences.getString(key, "");
        int result = defaultValue;
        try {
            result = Integer.parseInt(s);
        } catch (NumberFormatException e) {
            // Ignore, result is already the default value.
        }
        return result;
    }

    private boolean getBooleanPreference(String key, boolean defaultValue) {
        return getIntPreference(key, defaultValue ? 1 : 0) != 0;
    }

    private void createVideoPath() {
        long dateTaken = System.currentTimeMillis();
        String title = createName(dateTaken);
        String displayName = title + ".3gp"; // Used when emailing.
        String cameraDirPath = ImageManager.CAMERA_IMAGE_BUCKET_NAME;
        File cameraDir = new File(cameraDirPath);
        cameraDir.mkdirs();
        SimpleDateFormat dateFormat =
                new SimpleDateFormat(getString(R.string.video_file_name_format));
        Date date = new Date(dateTaken);
        String filepart = dateFormat.format(date);
        String filename = cameraDirPath + "/" + filepart + ".3gp";
        ContentValues values = new ContentValues(7);
        values.put(Video.Media.TITLE, title);
        values.put(Video.Media.DISPLAY_NAME, displayName);
        values.put(Video.Media.DATE_TAKEN, dateTaken);
        values.put(Video.Media.MIME_TYPE, "video/3gpp");
        values.put(Video.Media.DATA, filename);
        mCameraVideoFilename = filename;
        Log.v(TAG, "Current camera video filename: " + mCameraVideoFilename);
        mCurrentVideoValues = values;
    }

    private void registerVideo() {
        if (mCameraVideoFileDescriptor == null) {
            Uri videoTable = Uri.parse("content://media/external/video/media");
            mCurrentVideoValues.put(Video.Media.SIZE, new File(mCurrentVideoFilename).length());
            mCurrentVideoUri = mContentResolver.insert(videoTable, mCurrentVideoValues);
            Log.v(TAG, "Current video URI: " + mCurrentVideoUri);
        }
        mCurrentVideoValues = null;
    }

    private void deleteCurrentVideo() {
        if (mCurrentVideoFilename != null) {
            deleteVideoFile(mCurrentVideoFilename);
            mCurrentVideoFilename = null;
        }
        if (mCurrentVideoUri != null) {
            mContentResolver.delete(mCurrentVideoUri, null, null);
            mCurrentVideoUri = null;
        }
        updateAndShowStorageHint(true);
    }

    private void deleteVideoFile(String fileName) {
        Log.v(TAG, "Deleting video " + fileName);
        File f = new File(fileName);
        if (!f.delete()) {
            Log.v(TAG, "Could not delete " + fileName);
        }
    }

    private void addBaseMenuItems(Menu menu) {
        MenuHelper.addSwitchModeMenuItem(menu, this, false);
        {
            MenuItem gallery =
                    menu.add(MenuHelper.IMAGE_MODE_ITEM, MENU_GALLERY_PHOTOS, 0,
                            R.string.camera_gallery_photos_text).setOnMenuItemClickListener(
                            new OnMenuItemClickListener() {
                                public boolean onMenuItemClick(MenuItem item) {
                                    gotoGallery();
                                    return true;
                                }
                            });
            gallery.setIcon(android.R.drawable.ic_menu_gallery);
            mGalleryItems.add(gallery);
        }
        {
            MenuItem gallery =
                    menu.add(MenuHelper.VIDEO_MODE_ITEM, MENU_GALLERY_VIDEOS, 0,
                            R.string.camera_gallery_photos_text).setOnMenuItemClickListener(
                            new OnMenuItemClickListener() {
                                public boolean onMenuItemClick(MenuItem item) {
                                    gotoGallery();
                                    return true;
                                }
                            });
            gallery.setIcon(android.R.drawable.ic_menu_gallery);
            mGalleryItems.add(gallery);
        }

        MenuItem item =
                menu.add(MenuHelper.GENERIC_ITEM, MENU_SETTINGS, 0, R.string.settings)
                        .setOnMenuItemClickListener(new OnMenuItemClickListener() {
                            public boolean onMenuItemClick(MenuItem item) {
                                // Keep the camera instance for a while.
                                // This avoids re-opening the camera and saves
                                // time.
                                CameraHolder.instance().keep();

                                Intent intent = new Intent();
                                intent.setClass(VideoCamera.this, CameraSettings.class);
                                startActivity(intent);
                                return true;
                            }
                        });
        item.setIcon(android.R.drawable.ic_menu_preferences);
    }

    // from MediaRecorder.OnErrorListener
    public void onError(MediaRecorder mr, int what, int extra) {
        if (what == MediaRecorder.MEDIA_RECORDER_ERROR_UNKNOWN) {
            // We may have run out of space on the sdcard.
            stopVideoRecording();
            updateAndShowStorageHint(true);
        }
    }

    // from MediaRecorder.OnInfoListener
    public void onInfo(MediaRecorder mr, int what, int extra) {
        if (what == MediaRecorder.MEDIA_RECORDER_INFO_MAX_DURATION_REACHED) {
            mShutterButton.performClick();
        } else if (what == MediaRecorder.MEDIA_RECORDER_INFO_MAX_FILESIZE_REACHED) {
            mShutterButton.performClick();
            updateAndShowStorageHint(true);
        }
    }

    /*
     * Make sure we're not recording music playing in the background, ask the
     * MediaPlaybackService to pause playback.
     */
    private void pauseAudioPlayback() {
        // Shamelessly copied from MediaPlaybackService.java, which
        // should be public, but isn't.
        Intent i = new Intent("com.android.music.musicservicecommand");
        i.putExtra("command", "pause");

        sendBroadcast(i);
    }

    private void startVideoRecording() {
        Log.v(TAG, "startVideoRecording");
        if (!mMediaRecorderRecording) {

            if (mStorageStatus != STORAGE_STATUS_OK) {
                Log.v(TAG, "Storage issue, ignore the start request");
                return;
            }

            // Check mMediaRecorder to see whether it is initialized or not.
            if (mMediaRecorder == null) {
                Log.e(TAG, "MediaRecorder is not initialized.");
                return;
            }

            pauseAudioPlayback();

            try {
                mMediaRecorder.setOnErrorListener(this);
                mMediaRecorder.setOnInfoListener(this);
                mMediaRecorder.start(); // Recording is now started
            } catch (RuntimeException e) {
                Log.e(TAG, "Could not start media recorder. ", e);
                return;
            }
            mMediaRecorderRecording = true;
            mRecordingStartTime = SystemClock.uptimeMillis();
            updateRecordingIndicator(false);
            mRecordingTimeView.setText("");
            mRecordingTimeView.setVisibility(View.VISIBLE);
            mHandler.sendEmptyMessage(UPDATE_RECORD_TIME);
            setScreenTimeoutInfinite();
        }
    }

    private void updateRecordingIndicator(boolean showRecording) {
        int drawableId =
                showRecording ? R.drawable.btn_ic_video_record
                        : R.drawable.btn_ic_video_record_stop;
        Drawable drawable = getResources().getDrawable(drawableId);
        mShutterButton.setImageDrawable(drawable);
    }

    private void stopVideoRecordingAndGetThumbnail() {
        stopVideoRecording();
        acquireVideoThumb();
    }

    private void stopVideoRecordingAndShowAlert() {
        stopVideoRecording();
        showAlert();
    }

    private void showAlert() {
        mVideoPreview.setVisibility(View.INVISIBLE);
        fadeOut(findViewById(R.id.shutter_button));
        if (mCurrentVideoFilename != null) {
            mVideoFrame.setImageBitmap(
                    Util.createVideoThumbnail(mCurrentVideoFilename));
            mVideoFrame.setVisibility(View.VISIBLE);
        }
        int[] pickIds = {R.id.btn_retake, R.id.btn_done, R.id.btn_play};
        for (int id : pickIds) {
            View button = findViewById(id);
            fadeIn(((View) button.getParent()));
        }
    }

    private void hideAlert() {
        mVideoPreview.setVisibility(View.VISIBLE);
        mVideoFrame.setVisibility(View.INVISIBLE);
        fadeIn(findViewById(R.id.shutter_button));
        int[] pickIds = {R.id.btn_retake, R.id.btn_done, R.id.btn_play};
        for (int id : pickIds) {
            View button = findViewById(id);
            fadeOut(((View) button.getParent()));
        }
    }

    private static void fadeIn(View view) {
        view.setVisibility(View.VISIBLE);
        Animation animation = new AlphaAnimation(0F, 1F);
        animation.setDuration(500);
        view.startAnimation(animation);
    }

    private static void fadeOut(View view) {
        view.setVisibility(View.INVISIBLE);
        Animation animation = new AlphaAnimation(1F, 0F);
        animation.setDuration(500);
        view.startAnimation(animation);
    }

    private boolean isAlertVisible() {
        return this.mVideoFrame.getVisibility() == View.VISIBLE;
    }

    private void stopVideoRecordingAndShowReview() {
        stopVideoRecording();
        if (mThumbController.isUriValid()) {
            Uri targetUri = mThumbController.getUri();
            Intent intent = new Intent(this, ReviewImage.class);
            intent.setData(targetUri);
            intent.putExtra(MediaStore.EXTRA_FULL_SCREEN, true);
            intent.putExtra(MediaStore.EXTRA_SHOW_ACTION_ICONS, true);
            intent.putExtra("com.android.camera.ReviewMode", true);
            try {
                startActivity(intent);
            } catch (ActivityNotFoundException ex) {
                Log.e(TAG, "review video fail", ex);
            }
        } else {
            Log.e(TAG, "Can't view last video.");
        }
    }

    private void stopVideoRecording() {
        Log.v(TAG, "stopVideoRecording");
        boolean needToRegisterRecording = false;
        if (mMediaRecorderRecording || mMediaRecorder != null) {
            if (mMediaRecorderRecording && mMediaRecorder != null) {
                try {
                    mMediaRecorder.setOnErrorListener(null);
                    mMediaRecorder.setOnInfoListener(null);
                    mMediaRecorder.stop();
                } catch (RuntimeException e) {
                    Log.e(TAG, "stop fail: " + e.getMessage());
                }

                mCurrentVideoFilename = mCameraVideoFilename;
                Log.v(TAG, "Setting current video filename: " + mCurrentVideoFilename);
                needToRegisterRecording = true;
                mMediaRecorderRecording = false;
            }
            releaseMediaRecorder();
            updateRecordingIndicator(true);
            mRecordingTimeView.setVisibility(View.GONE);
            setScreenTimeoutLong();
        }
        if (needToRegisterRecording && mStorageStatus == STORAGE_STATUS_OK) {
            registerVideo();
        }

        mCameraVideoFilename = null;
        mCameraVideoFileDescriptor = null;
    }

    private void setScreenTimeoutSystemDefault() {
        mHandler.removeMessages(CLEAR_SCREEN_DELAY);
        clearScreenOnFlag();
    }

    private void setScreenTimeoutLong() {
        mHandler.removeMessages(CLEAR_SCREEN_DELAY);
        setScreenOnFlag();
        mHandler.sendEmptyMessageDelayed(CLEAR_SCREEN_DELAY, SCREEN_DELAY);
    }

    private void setScreenTimeoutInfinite() {
        mHandler.removeMessages(CLEAR_SCREEN_DELAY);
        setScreenOnFlag();
    }

    private void clearScreenOnFlag() {
        Window w = getWindow();
        final int flag = WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
        if ((w.getAttributes().flags & flag) != 0) {
            w.clearFlags(flag);
        }
    }

    private void setScreenOnFlag() {
        Window w = getWindow();
        final int flag = WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
        if ((w.getAttributes().flags & flag) == 0) {
            w.addFlags(flag);
        }
    }

    private void hideAlertAndInitializeRecorder() {
        hideAlert();
        mRecorderInitialized = false;
        mHandler.sendEmptyMessage(INIT_RECORDER);
    }

    private void acquireVideoThumb() {
        Bitmap videoFrame = Util.createVideoThumbnail(mCurrentVideoFilename);
        mThumbController.setData(mCurrentVideoUri, videoFrame);
    }

    private static ImageManager.DataLocation dataLocation() {
        return ImageManager.DataLocation.EXTERNAL;
    }

    private void updateLastVideo() {
        IImageList list =
                ImageManager.allImages(mContentResolver, dataLocation(),
                        ImageManager.INCLUDE_VIDEOS, ImageManager.SORT_ASCENDING,
                        ImageManager.CAMERA_IMAGE_BUCKET_ID);
        int count = list.getCount();
        if (count > 0) {
            IImage image = list.getImageAt(count - 1);
            Uri uri = image.fullSizeImageUri();
            mThumbController.setData(uri, image.miniThumbBitmap());
        } else {
            mThumbController.setData(null, null);
        }
        list.deactivate();
    }

    private void updateRecordingTime() {
        if (!mMediaRecorderRecording) {
            return;
        }
        long now = SystemClock.uptimeMillis();
        long delta = now - mRecordingStartTime;

        // Starting a minute before reaching the max duration
        // limit, we'll countdown the remaining time instead.
        boolean countdownRemainingTime = (delta >= mMaxVideoDurationInMs - 60000);

        if (countdownRemainingTime) {
            delta = Math.max(0, mMaxVideoDurationInMs - delta);
        }

        long seconds = (delta + 500) / 1000; // round to nearest
        long minutes = seconds / 60;
        long hours = minutes / 60;
        long remainderMinutes = minutes - (hours * 60);
        long remainderSeconds = seconds - (minutes * 60);

        String secondsString = Long.toString(remainderSeconds);
        if (secondsString.length() < 2) {
            secondsString = "0" + secondsString;
        }
        String minutesString = Long.toString(remainderMinutes);
        if (minutesString.length() < 2) {
            minutesString = "0" + minutesString;
        }
        String text = minutesString + ":" + secondsString;
        if (hours > 0) {
            String hoursString = Long.toString(hours);
            if (hoursString.length() < 2) {
                hoursString = "0" + hoursString;
            }
            text = hoursString + ":" + text;
        }
        mRecordingTimeView.setText(text);

        if (mRecordingTimeCountsDown != countdownRemainingTime) {
            // Avoid setting the color on every update, do it only
            // when it needs changing.

            mRecordingTimeCountsDown = countdownRemainingTime;

            int color =
                    getResources().getColor(
                            countdownRemainingTime ? R.color.recording_time_remaining_text
                                    : R.color.recording_time_elapsed_text);

            mRecordingTimeView.setTextColor(color);
        }

        // Work around a limitation of the T-Mobile G1: The T-Mobile
        // hardware blitter can't pixel-accurately scale and clip at the
        // same time, and the SurfaceFlinger doesn't attempt to work around
        // this limitation. In order to avoid visual corruption we must
        // manually refresh the entire surface view when changing any
        // overlapping view's contents.
        mVideoPreview.invalidate();
        mHandler.sendEmptyMessageDelayed(UPDATE_RECORD_TIME, 1000);
    }
}