CameraPicker.java revision 5eee0ee6fffdd2eb6a15b8c09d396973f1e63e8c 
1/*
2 * Copyright (C) 2010 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.camera.ui;
18
19import com.android.camera.ListPreference;
20import com.android.camera.R;
21
22import android.content.Context;
23import android.hardware.Camera.CameraInfo;
24import android.util.AttributeSet;
25import android.view.MotionEvent;
26import android.view.View;
27import android.widget.ImageView;
28
29/**
30 * A view for switching the front/back camera.
31 */
32public class CameraPicker extends ImageView implements View.OnClickListener,
33        View.OnTouchListener {
34    private Listener mListener;
35    private ListPreference mPreference;
36    private CharSequence[] mCameras;
37    private int mCameraIndex;
38
39    public CameraPicker(Context context, AttributeSet attrs) {
40        super(context, attrs);
41    }
42
43    static public interface Listener {
44        public void onSharedPreferenceChanged();
45    }
46
47    public void setListener(Listener listener) {
48        mListener = listener;
49    }
50
51    public void initialize(ListPreference pref) {
52        mPreference = pref;
53        mCameras = pref.getEntryValues();
54        if (mCameras == null) return;
55        setOnClickListener(this);
56        setOnTouchListener(this);
57        String cameraId = pref.getValue();
58        setVisibility(View.VISIBLE);
59        if (mCameras[CameraInfo.CAMERA_FACING_FRONT].equals(cameraId)) {
60            mCameraIndex = CameraInfo.CAMERA_FACING_FRONT;
61        } else {
62            mCameraIndex = CameraInfo.CAMERA_FACING_BACK;
63        }
64    }
65
66    public void onClick(View v) {
67        if (mCameras == null) return;
68        int newCameraIndex = (mCameraIndex == CameraInfo.CAMERA_FACING_BACK)
69                ? CameraInfo.CAMERA_FACING_FRONT
70                : CameraInfo.CAMERA_FACING_BACK;
71        mCameraIndex = newCameraIndex;
72        mPreference.setValue((String) mCameras[mCameraIndex]);
73        mListener.onSharedPreferenceChanged();
74    }
75
76    public boolean onTouch(View v, MotionEvent event) {
77        if (event.getAction() == MotionEvent.ACTION_DOWN) {
78            // Switching camera takes a long time. The drawable state changes
79            // after onClick. Set pressed state now so UI looks more responsive.
80            setPressed(true);
81        }
82        return false;
83    }
84}
85