1package android.app;
2
3import com.android.internal.view.IInputMethodCallback;
4import com.android.internal.view.IInputMethodSession;
5
6import android.content.Context;
7import android.content.pm.ActivityInfo;
8import android.content.pm.PackageManager;
9import android.content.res.AssetManager;
10import android.content.res.Configuration;
11import android.graphics.PixelFormat;
12import android.os.Build;
13import android.os.Bundle;
14import android.os.Environment;
15import android.os.Looper;
16import android.os.MessageQueue;
17import android.util.AttributeSet;
18import android.view.InputChannel;
19import android.view.InputQueue;
20import android.view.KeyEvent;
21import android.view.Surface;
22import android.view.SurfaceHolder;
23import android.view.View;
24import android.view.WindowManager;
25import android.view.ViewTreeObserver.OnGlobalLayoutListener;
26import android.view.inputmethod.InputMethodManager;
27
28import java.io.File;
29import java.lang.ref.WeakReference;
30
31/**
32 * Convenience for implementing an activity that will be implemented
33 * purely in native code.  That is, a game (or game-like thing).  There
34 * is no need to derive from this class; you can simply declare it in your
35 * manifest, and use the NDK APIs from there.
36 *
37 * <p>A typical manifest would look like:
38 *
39 * {@sample development/ndk/platforms/android-9/samples/native-activity/AndroidManifest.xml
40 *      manifest}
41 *
42 * <p>A very simple example of native code that is run by NativeActivity
43 * follows.  This reads input events from the user and uses OpenGLES to
44 * draw into the native activity's window.
45 *
46 * {@sample development/ndk/platforms/android-9/samples/native-activity/jni/main.c all}
47 */
48public class NativeActivity extends Activity implements SurfaceHolder.Callback2,
49        InputQueue.Callback, OnGlobalLayoutListener {
50    /**
51     * Optional meta-that can be in the manifest for this component, specifying
52     * the name of the native shared library to load.  If not specified,
53     * "main" is used.
54     */
55    public static final String META_DATA_LIB_NAME = "android.app.lib_name";
56
57    /**
58     * Optional meta-that can be in the manifest for this component, specifying
59     * the name of the main entry point for this native activity in the
60     * {@link #META_DATA_LIB_NAME} native code.  If not specified,
61     * "ANativeActivity_onCreate" is used.
62     */
63    public static final String META_DATA_FUNC_NAME = "android.app.func_name";
64
65    private static final String KEY_NATIVE_SAVED_STATE = "android:native_state";
66
67    private NativeContentView mNativeContentView;
68    private InputMethodManager mIMM;
69    private InputMethodCallback mInputMethodCallback;
70
71    private int mNativeHandle;
72
73    private InputQueue mCurInputQueue;
74    private SurfaceHolder mCurSurfaceHolder;
75
76    final int[] mLocation = new int[2];
77    int mLastContentX;
78    int mLastContentY;
79    int mLastContentWidth;
80    int mLastContentHeight;
81
82    private boolean mDispatchingUnhandledKey;
83
84    private boolean mDestroyed;
85
86    private native int loadNativeCode(String path, String funcname, MessageQueue queue,
87            String internalDataPath, String obbPath, String externalDataPath, int sdkVersion,
88            AssetManager assetMgr, byte[] savedState);
89    private native void unloadNativeCode(int handle);
90
91    private native void onStartNative(int handle);
92    private native void onResumeNative(int handle);
93    private native byte[] onSaveInstanceStateNative(int handle);
94    private native void onPauseNative(int handle);
95    private native void onStopNative(int handle);
96    private native void onConfigurationChangedNative(int handle);
97    private native void onLowMemoryNative(int handle);
98    private native void onWindowFocusChangedNative(int handle, boolean focused);
99    private native void onSurfaceCreatedNative(int handle, Surface surface);
100    private native void onSurfaceChangedNative(int handle, Surface surface,
101            int format, int width, int height);
102    private native void onSurfaceRedrawNeededNative(int handle, Surface surface);
103    private native void onSurfaceDestroyedNative(int handle);
104    private native void onInputChannelCreatedNative(int handle, InputChannel channel);
105    private native void onInputChannelDestroyedNative(int handle, InputChannel channel);
106    private native void onContentRectChangedNative(int handle, int x, int y, int w, int h);
107    private native void dispatchKeyEventNative(int handle, KeyEvent event);
108    private native void finishPreDispatchKeyEventNative(int handle, int seq, boolean handled);
109
110    static class NativeContentView extends View {
111        NativeActivity mActivity;
112
113        public NativeContentView(Context context) {
114            super(context);
115        }
116
117        public NativeContentView(Context context, AttributeSet attrs) {
118            super(context, attrs);
119        }
120    }
121
122    static class InputMethodCallback extends IInputMethodCallback.Stub {
123        WeakReference<NativeActivity> mNa;
124
125        InputMethodCallback(NativeActivity na) {
126            mNa = new WeakReference<NativeActivity>(na);
127        }
128
129        @Override
130        public void finishedEvent(int seq, boolean handled) {
131            NativeActivity na = mNa.get();
132            if (na != null) {
133                na.finishPreDispatchKeyEventNative(na.mNativeHandle, seq, handled);
134            }
135        }
136
137        @Override
138        public void sessionCreated(IInputMethodSession session) {
139            // Stub -- not for use in the client.
140        }
141    }
142
143    @Override
144    protected void onCreate(Bundle savedInstanceState) {
145        String libname = "main";
146        String funcname = "ANativeActivity_onCreate";
147        ActivityInfo ai;
148
149        mIMM = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
150        mInputMethodCallback = new InputMethodCallback(this);
151
152        getWindow().takeSurface(this);
153        getWindow().takeInputQueue(this);
154        getWindow().setFormat(PixelFormat.RGB_565);
155        getWindow().setSoftInputMode(
156                WindowManager.LayoutParams.SOFT_INPUT_STATE_UNSPECIFIED
157                | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
158
159        mNativeContentView = new NativeContentView(this);
160        mNativeContentView.mActivity = this;
161        setContentView(mNativeContentView);
162        mNativeContentView.requestFocus();
163        mNativeContentView.getViewTreeObserver().addOnGlobalLayoutListener(this);
164
165        try {
166            ai = getPackageManager().getActivityInfo(
167                    getIntent().getComponent(), PackageManager.GET_META_DATA);
168            if (ai.metaData != null) {
169                String ln = ai.metaData.getString(META_DATA_LIB_NAME);
170                if (ln != null) libname = ln;
171                ln = ai.metaData.getString(META_DATA_FUNC_NAME);
172                if (ln != null) funcname = ln;
173            }
174        } catch (PackageManager.NameNotFoundException e) {
175            throw new RuntimeException("Error getting activity info", e);
176        }
177
178        String path = null;
179
180        File libraryFile = new File(ai.applicationInfo.nativeLibraryDir,
181                System.mapLibraryName(libname));
182        if (libraryFile.exists()) {
183            path = libraryFile.getPath();
184        }
185
186        if (path == null) {
187            throw new IllegalArgumentException("Unable to find native library: " + libname);
188        }
189
190        byte[] nativeSavedState = savedInstanceState != null
191                ? savedInstanceState.getByteArray(KEY_NATIVE_SAVED_STATE) : null;
192
193        mNativeHandle = loadNativeCode(path, funcname, Looper.myQueue(),
194                 getFilesDir().toString(), getObbDir().toString(),
195                 Environment.getExternalStorageAppFilesDirectory(ai.packageName).toString(),
196                 Build.VERSION.SDK_INT, getAssets(), nativeSavedState);
197
198        if (mNativeHandle == 0) {
199            throw new IllegalArgumentException("Unable to load native library: " + path);
200        }
201        super.onCreate(savedInstanceState);
202    }
203
204    @Override
205    protected void onDestroy() {
206        mDestroyed = true;
207        if (mCurSurfaceHolder != null) {
208            onSurfaceDestroyedNative(mNativeHandle);
209            mCurSurfaceHolder = null;
210        }
211        if (mCurInputQueue != null) {
212            onInputChannelDestroyedNative(mNativeHandle, mCurInputQueue.getInputChannel());
213            mCurInputQueue = null;
214        }
215        unloadNativeCode(mNativeHandle);
216        super.onDestroy();
217    }
218
219    @Override
220    protected void onPause() {
221        super.onPause();
222        onPauseNative(mNativeHandle);
223    }
224
225    @Override
226    protected void onResume() {
227        super.onResume();
228        onResumeNative(mNativeHandle);
229    }
230
231    @Override
232    protected void onSaveInstanceState(Bundle outState) {
233        super.onSaveInstanceState(outState);
234        byte[] state = onSaveInstanceStateNative(mNativeHandle);
235        if (state != null) {
236            outState.putByteArray(KEY_NATIVE_SAVED_STATE, state);
237        }
238    }
239
240    @Override
241    protected void onStart() {
242        super.onStart();
243        onStartNative(mNativeHandle);
244    }
245
246    @Override
247    protected void onStop() {
248        super.onStop();
249        onStopNative(mNativeHandle);
250    }
251
252    @Override
253    public void onConfigurationChanged(Configuration newConfig) {
254        super.onConfigurationChanged(newConfig);
255        if (!mDestroyed) {
256            onConfigurationChangedNative(mNativeHandle);
257        }
258    }
259
260    @Override
261    public void onLowMemory() {
262        super.onLowMemory();
263        if (!mDestroyed) {
264            onLowMemoryNative(mNativeHandle);
265        }
266    }
267
268    @Override
269    public void onWindowFocusChanged(boolean hasFocus) {
270        super.onWindowFocusChanged(hasFocus);
271        if (!mDestroyed) {
272            onWindowFocusChangedNative(mNativeHandle, hasFocus);
273        }
274    }
275
276    @Override
277    public boolean dispatchKeyEvent(KeyEvent event) {
278        if (mDispatchingUnhandledKey) {
279            return super.dispatchKeyEvent(event);
280        } else {
281            // Key events from the IME do not go through the input channel;
282            // we need to intercept them here to hand to the application.
283            dispatchKeyEventNative(mNativeHandle, event);
284            return true;
285        }
286    }
287
288    public void surfaceCreated(SurfaceHolder holder) {
289        if (!mDestroyed) {
290            mCurSurfaceHolder = holder;
291            onSurfaceCreatedNative(mNativeHandle, holder.getSurface());
292        }
293    }
294
295    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
296        if (!mDestroyed) {
297            mCurSurfaceHolder = holder;
298            onSurfaceChangedNative(mNativeHandle, holder.getSurface(), format, width, height);
299        }
300    }
301
302    public void surfaceRedrawNeeded(SurfaceHolder holder) {
303        if (!mDestroyed) {
304            mCurSurfaceHolder = holder;
305            onSurfaceRedrawNeededNative(mNativeHandle, holder.getSurface());
306        }
307    }
308
309    public void surfaceDestroyed(SurfaceHolder holder) {
310        mCurSurfaceHolder = null;
311        if (!mDestroyed) {
312            onSurfaceDestroyedNative(mNativeHandle);
313        }
314    }
315
316    public void onInputQueueCreated(InputQueue queue) {
317        if (!mDestroyed) {
318            mCurInputQueue = queue;
319            onInputChannelCreatedNative(mNativeHandle, queue.getInputChannel());
320        }
321    }
322
323    public void onInputQueueDestroyed(InputQueue queue) {
324        mCurInputQueue = null;
325        if (!mDestroyed) {
326            onInputChannelDestroyedNative(mNativeHandle, queue.getInputChannel());
327        }
328    }
329
330    public void onGlobalLayout() {
331        mNativeContentView.getLocationInWindow(mLocation);
332        int w = mNativeContentView.getWidth();
333        int h = mNativeContentView.getHeight();
334        if (mLocation[0] != mLastContentX || mLocation[1] != mLastContentY
335                || w != mLastContentWidth || h != mLastContentHeight) {
336            mLastContentX = mLocation[0];
337            mLastContentY = mLocation[1];
338            mLastContentWidth = w;
339            mLastContentHeight = h;
340            if (!mDestroyed) {
341                onContentRectChangedNative(mNativeHandle, mLastContentX,
342                        mLastContentY, mLastContentWidth, mLastContentHeight);
343            }
344        }
345    }
346
347    boolean dispatchUnhandledKeyEvent(KeyEvent event) {
348        try {
349            mDispatchingUnhandledKey = true;
350            View decor = getWindow().getDecorView();
351            if (decor != null) {
352                return decor.dispatchKeyEvent(event);
353            } else {
354                return false;
355            }
356        } finally {
357            mDispatchingUnhandledKey = false;
358        }
359    }
360
361    void preDispatchKeyEvent(KeyEvent event, int seq) {
362        mIMM.dispatchKeyEvent(this, seq, event,
363                mInputMethodCallback);
364    }
365
366    void setWindowFlags(int flags, int mask) {
367        getWindow().setFlags(flags, mask);
368    }
369
370    void setWindowFormat(int format) {
371        getWindow().setFormat(format);
372    }
373
374    void showIme(int mode) {
375        mIMM.showSoftInput(mNativeContentView, mode);
376    }
377
378    void hideIme(int mode) {
379        mIMM.hideSoftInputFromWindow(mNativeContentView.getWindowToken(), mode);
380    }
381}
382