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 android.app;
18
19import android.content.Context;
20import android.content.pm.ActivityInfo;
21import android.content.pm.PackageManager;
22import android.content.res.AssetManager;
23import android.content.res.Configuration;
24import android.graphics.PixelFormat;
25import android.os.Build;
26import android.os.Bundle;
27import android.os.Looper;
28import android.os.MessageQueue;
29import android.util.AttributeSet;
30import android.view.InputQueue;
31import android.view.Surface;
32import android.view.SurfaceHolder;
33import android.view.View;
34import android.view.ViewTreeObserver.OnGlobalLayoutListener;
35import android.view.WindowManager;
36import android.view.inputmethod.InputMethodManager;
37
38import java.io.File;
39
40/**
41 * Convenience for implementing an activity that will be implemented
42 * purely in native code.  That is, a game (or game-like thing).  There
43 * is no need to derive from this class; you can simply declare it in your
44 * manifest, and use the NDK APIs from there.
45 *
46 * <p>A typical manifest would look like:
47 *
48 * {@sample development/ndk/platforms/android-9/samples/native-activity/AndroidManifest.xml
49 *      manifest}
50 *
51 * <p>A very simple example of native code that is run by NativeActivity
52 * follows.  This reads input events from the user and uses OpenGLES to
53 * draw into the native activity's window.
54 *
55 * {@sample development/ndk/platforms/android-9/samples/native-activity/jni/main.c all}
56 */
57public class NativeActivity extends Activity implements SurfaceHolder.Callback2,
58        InputQueue.Callback, OnGlobalLayoutListener {
59    /**
60     * Optional meta-that can be in the manifest for this component, specifying
61     * the name of the native shared library to load.  If not specified,
62     * "main" is used.
63     */
64    public static final String META_DATA_LIB_NAME = "android.app.lib_name";
65
66    /**
67     * Optional meta-that can be in the manifest for this component, specifying
68     * the name of the main entry point for this native activity in the
69     * {@link #META_DATA_LIB_NAME} native code.  If not specified,
70     * "ANativeActivity_onCreate" is used.
71     */
72    public static final String META_DATA_FUNC_NAME = "android.app.func_name";
73
74    private static final String KEY_NATIVE_SAVED_STATE = "android:native_state";
75
76    private NativeContentView mNativeContentView;
77    private InputMethodManager mIMM;
78
79    private long mNativeHandle;
80
81    private InputQueue mCurInputQueue;
82    private SurfaceHolder mCurSurfaceHolder;
83
84    final int[] mLocation = new int[2];
85    int mLastContentX;
86    int mLastContentY;
87    int mLastContentWidth;
88    int mLastContentHeight;
89
90    private boolean mDispatchingUnhandledKey;
91
92    private boolean mDestroyed;
93
94    private native long loadNativeCode(String path, String funcname, MessageQueue queue,
95            String internalDataPath, String obbPath, String externalDataPath, int sdkVersion,
96            AssetManager assetMgr, byte[] savedState);
97    private native void unloadNativeCode(long handle);
98    private native void onStartNative(long handle);
99    private native void onResumeNative(long handle);
100    private native byte[] onSaveInstanceStateNative(long handle);
101    private native void onPauseNative(long handle);
102    private native void onStopNative(long handle);
103    private native void onConfigurationChangedNative(long handle);
104    private native void onLowMemoryNative(long handle);
105    private native void onWindowFocusChangedNative(long handle, boolean focused);
106    private native void onSurfaceCreatedNative(long handle, Surface surface);
107    private native void onSurfaceChangedNative(long handle, Surface surface,
108            int format, int width, int height);
109    private native void onSurfaceRedrawNeededNative(long handle, Surface surface);
110    private native void onSurfaceDestroyedNative(long handle);
111    private native void onInputQueueCreatedNative(long handle, long queuePtr);
112    private native void onInputQueueDestroyedNative(long handle, long queuePtr);
113    private native void onContentRectChangedNative(long handle, int x, int y, int w, int h);
114
115    static class NativeContentView extends View {
116        NativeActivity mActivity;
117
118        public NativeContentView(Context context) {
119            super(context);
120        }
121
122        public NativeContentView(Context context, AttributeSet attrs) {
123            super(context, attrs);
124        }
125    }
126
127    @Override
128    protected void onCreate(Bundle savedInstanceState) {
129        String libname = "main";
130        String funcname = "ANativeActivity_onCreate";
131        ActivityInfo ai;
132
133        mIMM = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
134
135        getWindow().takeSurface(this);
136        getWindow().takeInputQueue(this);
137        getWindow().setFormat(PixelFormat.RGB_565);
138        getWindow().setSoftInputMode(
139                WindowManager.LayoutParams.SOFT_INPUT_STATE_UNSPECIFIED
140                | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
141
142        mNativeContentView = new NativeContentView(this);
143        mNativeContentView.mActivity = this;
144        setContentView(mNativeContentView);
145        mNativeContentView.requestFocus();
146        mNativeContentView.getViewTreeObserver().addOnGlobalLayoutListener(this);
147
148        try {
149            ai = getPackageManager().getActivityInfo(
150                    getIntent().getComponent(), PackageManager.GET_META_DATA);
151            if (ai.metaData != null) {
152                String ln = ai.metaData.getString(META_DATA_LIB_NAME);
153                if (ln != null) libname = ln;
154                ln = ai.metaData.getString(META_DATA_FUNC_NAME);
155                if (ln != null) funcname = ln;
156            }
157        } catch (PackageManager.NameNotFoundException e) {
158            throw new RuntimeException("Error getting activity info", e);
159        }
160
161        String path = null;
162
163        File libraryFile = new File(ai.applicationInfo.nativeLibraryDir,
164                System.mapLibraryName(libname));
165        if (libraryFile.exists()) {
166            path = libraryFile.getPath();
167        }
168
169        if (path == null) {
170            throw new IllegalArgumentException("Unable to find native library: " + libname);
171        }
172
173        byte[] nativeSavedState = savedInstanceState != null
174                ? savedInstanceState.getByteArray(KEY_NATIVE_SAVED_STATE) : null;
175
176        mNativeHandle = loadNativeCode(path, funcname, Looper.myQueue(),
177                getAbsolutePath(getFilesDir()), getAbsolutePath(getObbDir()),
178                getAbsolutePath(getExternalFilesDir(null)),
179                Build.VERSION.SDK_INT, getAssets(), nativeSavedState);
180
181        if (mNativeHandle == 0) {
182            throw new IllegalArgumentException("Unable to load native library: " + path);
183        }
184        super.onCreate(savedInstanceState);
185    }
186
187    private static String getAbsolutePath(File file) {
188        return (file != null) ? file.getAbsolutePath() : null;
189    }
190
191    @Override
192    protected void onDestroy() {
193        mDestroyed = true;
194        if (mCurSurfaceHolder != null) {
195            onSurfaceDestroyedNative(mNativeHandle);
196            mCurSurfaceHolder = null;
197        }
198        if (mCurInputQueue != null) {
199            onInputQueueDestroyedNative(mNativeHandle, mCurInputQueue.getNativePtr());
200            mCurInputQueue = null;
201        }
202        unloadNativeCode(mNativeHandle);
203        super.onDestroy();
204    }
205
206    @Override
207    protected void onPause() {
208        super.onPause();
209        onPauseNative(mNativeHandle);
210    }
211
212    @Override
213    protected void onResume() {
214        super.onResume();
215        onResumeNative(mNativeHandle);
216    }
217
218    @Override
219    protected void onSaveInstanceState(Bundle outState) {
220        super.onSaveInstanceState(outState);
221        byte[] state = onSaveInstanceStateNative(mNativeHandle);
222        if (state != null) {
223            outState.putByteArray(KEY_NATIVE_SAVED_STATE, state);
224        }
225    }
226
227    @Override
228    protected void onStart() {
229        super.onStart();
230        onStartNative(mNativeHandle);
231    }
232
233    @Override
234    protected void onStop() {
235        super.onStop();
236        onStopNative(mNativeHandle);
237    }
238
239    @Override
240    public void onConfigurationChanged(Configuration newConfig) {
241        super.onConfigurationChanged(newConfig);
242        if (!mDestroyed) {
243            onConfigurationChangedNative(mNativeHandle);
244        }
245    }
246
247    @Override
248    public void onLowMemory() {
249        super.onLowMemory();
250        if (!mDestroyed) {
251            onLowMemoryNative(mNativeHandle);
252        }
253    }
254
255    @Override
256    public void onWindowFocusChanged(boolean hasFocus) {
257        super.onWindowFocusChanged(hasFocus);
258        if (!mDestroyed) {
259            onWindowFocusChangedNative(mNativeHandle, hasFocus);
260        }
261    }
262
263    public void surfaceCreated(SurfaceHolder holder) {
264        if (!mDestroyed) {
265            mCurSurfaceHolder = holder;
266            onSurfaceCreatedNative(mNativeHandle, holder.getSurface());
267        }
268    }
269
270    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
271        if (!mDestroyed) {
272            mCurSurfaceHolder = holder;
273            onSurfaceChangedNative(mNativeHandle, holder.getSurface(), format, width, height);
274        }
275    }
276
277    public void surfaceRedrawNeeded(SurfaceHolder holder) {
278        if (!mDestroyed) {
279            mCurSurfaceHolder = holder;
280            onSurfaceRedrawNeededNative(mNativeHandle, holder.getSurface());
281        }
282    }
283
284    public void surfaceDestroyed(SurfaceHolder holder) {
285        mCurSurfaceHolder = null;
286        if (!mDestroyed) {
287            onSurfaceDestroyedNative(mNativeHandle);
288        }
289    }
290
291    public void onInputQueueCreated(InputQueue queue) {
292        if (!mDestroyed) {
293            mCurInputQueue = queue;
294            onInputQueueCreatedNative(mNativeHandle, queue.getNativePtr());
295        }
296    }
297
298    public void onInputQueueDestroyed(InputQueue queue) {
299        if (!mDestroyed) {
300            onInputQueueDestroyedNative(mNativeHandle, queue.getNativePtr());
301            mCurInputQueue = null;
302        }
303    }
304
305    public void onGlobalLayout() {
306        mNativeContentView.getLocationInWindow(mLocation);
307        int w = mNativeContentView.getWidth();
308        int h = mNativeContentView.getHeight();
309        if (mLocation[0] != mLastContentX || mLocation[1] != mLastContentY
310                || w != mLastContentWidth || h != mLastContentHeight) {
311            mLastContentX = mLocation[0];
312            mLastContentY = mLocation[1];
313            mLastContentWidth = w;
314            mLastContentHeight = h;
315            if (!mDestroyed) {
316                onContentRectChangedNative(mNativeHandle, mLastContentX,
317                        mLastContentY, mLastContentWidth, mLastContentHeight);
318            }
319        }
320    }
321
322    void setWindowFlags(int flags, int mask) {
323        getWindow().setFlags(flags, mask);
324    }
325
326    void setWindowFormat(int format) {
327        getWindow().setFormat(format);
328    }
329
330    void showIme(int mode) {
331        mIMM.showSoftInput(mNativeContentView, mode);
332    }
333
334    void hideIme(int mode) {
335        mIMM.hideSoftInputFromWindow(mNativeContentView.getWindowToken(), mode);
336    }
337}
338