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 int 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 int 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(int handle);
98
99    private native void onStartNative(int handle);
100    private native void onResumeNative(int handle);
101    private native byte[] onSaveInstanceStateNative(int handle);
102    private native void onPauseNative(int handle);
103    private native void onStopNative(int handle);
104    private native void onConfigurationChangedNative(int handle);
105    private native void onLowMemoryNative(int handle);
106    private native void onWindowFocusChangedNative(int handle, boolean focused);
107    private native void onSurfaceCreatedNative(int handle, Surface surface);
108    private native void onSurfaceChangedNative(int handle, Surface surface,
109            int format, int width, int height);
110    private native void onSurfaceRedrawNeededNative(int handle, Surface surface);
111    private native void onSurfaceDestroyedNative(int handle);
112    private native void onInputQueueCreatedNative(int handle, int queuePtr);
113    private native void onInputQueueDestroyedNative(int handle, int queuePtr);
114    private native void onContentRectChangedNative(int handle, int x, int y, int w, int h);
115
116    static class NativeContentView extends View {
117        NativeActivity mActivity;
118
119        public NativeContentView(Context context) {
120            super(context);
121        }
122
123        public NativeContentView(Context context, AttributeSet attrs) {
124            super(context, attrs);
125        }
126    }
127
128    @Override
129    protected void onCreate(Bundle savedInstanceState) {
130        String libname = "main";
131        String funcname = "ANativeActivity_onCreate";
132        ActivityInfo ai;
133
134        mIMM = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
135
136        getWindow().takeSurface(this);
137        getWindow().takeInputQueue(this);
138        getWindow().setFormat(PixelFormat.RGB_565);
139        getWindow().setSoftInputMode(
140                WindowManager.LayoutParams.SOFT_INPUT_STATE_UNSPECIFIED
141                | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
142
143        mNativeContentView = new NativeContentView(this);
144        mNativeContentView.mActivity = this;
145        setContentView(mNativeContentView);
146        mNativeContentView.requestFocus();
147        mNativeContentView.getViewTreeObserver().addOnGlobalLayoutListener(this);
148
149        try {
150            ai = getPackageManager().getActivityInfo(
151                    getIntent().getComponent(), PackageManager.GET_META_DATA);
152            if (ai.metaData != null) {
153                String ln = ai.metaData.getString(META_DATA_LIB_NAME);
154                if (ln != null) libname = ln;
155                ln = ai.metaData.getString(META_DATA_FUNC_NAME);
156                if (ln != null) funcname = ln;
157            }
158        } catch (PackageManager.NameNotFoundException e) {
159            throw new RuntimeException("Error getting activity info", e);
160        }
161
162        String path = null;
163
164        File libraryFile = new File(ai.applicationInfo.nativeLibraryDir,
165                System.mapLibraryName(libname));
166        if (libraryFile.exists()) {
167            path = libraryFile.getPath();
168        }
169
170        if (path == null) {
171            throw new IllegalArgumentException("Unable to find native library: " + libname);
172        }
173
174        byte[] nativeSavedState = savedInstanceState != null
175                ? savedInstanceState.getByteArray(KEY_NATIVE_SAVED_STATE) : null;
176
177        mNativeHandle = loadNativeCode(path, funcname, Looper.myQueue(),
178                getAbsolutePath(getFilesDir()), getAbsolutePath(getObbDir()),
179                getAbsolutePath(getExternalFilesDir(null)),
180                Build.VERSION.SDK_INT, getAssets(), nativeSavedState);
181
182        if (mNativeHandle == 0) {
183            throw new IllegalArgumentException("Unable to load native library: " + path);
184        }
185        super.onCreate(savedInstanceState);
186    }
187
188    private static String getAbsolutePath(File file) {
189        return (file != null) ? file.getAbsolutePath() : null;
190    }
191
192    @Override
193    protected void onDestroy() {
194        mDestroyed = true;
195        if (mCurSurfaceHolder != null) {
196            onSurfaceDestroyedNative(mNativeHandle);
197            mCurSurfaceHolder = null;
198        }
199        if (mCurInputQueue != null) {
200            onInputQueueDestroyedNative(mNativeHandle, mCurInputQueue.getNativePtr());
201            mCurInputQueue = null;
202        }
203        unloadNativeCode(mNativeHandle);
204        super.onDestroy();
205    }
206
207    @Override
208    protected void onPause() {
209        super.onPause();
210        onPauseNative(mNativeHandle);
211    }
212
213    @Override
214    protected void onResume() {
215        super.onResume();
216        onResumeNative(mNativeHandle);
217    }
218
219    @Override
220    protected void onSaveInstanceState(Bundle outState) {
221        super.onSaveInstanceState(outState);
222        byte[] state = onSaveInstanceStateNative(mNativeHandle);
223        if (state != null) {
224            outState.putByteArray(KEY_NATIVE_SAVED_STATE, state);
225        }
226    }
227
228    @Override
229    protected void onStart() {
230        super.onStart();
231        onStartNative(mNativeHandle);
232    }
233
234    @Override
235    protected void onStop() {
236        super.onStop();
237        onStopNative(mNativeHandle);
238    }
239
240    @Override
241    public void onConfigurationChanged(Configuration newConfig) {
242        super.onConfigurationChanged(newConfig);
243        if (!mDestroyed) {
244            onConfigurationChangedNative(mNativeHandle);
245        }
246    }
247
248    @Override
249    public void onLowMemory() {
250        super.onLowMemory();
251        if (!mDestroyed) {
252            onLowMemoryNative(mNativeHandle);
253        }
254    }
255
256    @Override
257    public void onWindowFocusChanged(boolean hasFocus) {
258        super.onWindowFocusChanged(hasFocus);
259        if (!mDestroyed) {
260            onWindowFocusChangedNative(mNativeHandle, hasFocus);
261        }
262    }
263
264    public void surfaceCreated(SurfaceHolder holder) {
265        if (!mDestroyed) {
266            mCurSurfaceHolder = holder;
267            onSurfaceCreatedNative(mNativeHandle, holder.getSurface());
268        }
269    }
270
271    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
272        if (!mDestroyed) {
273            mCurSurfaceHolder = holder;
274            onSurfaceChangedNative(mNativeHandle, holder.getSurface(), format, width, height);
275        }
276    }
277
278    public void surfaceRedrawNeeded(SurfaceHolder holder) {
279        if (!mDestroyed) {
280            mCurSurfaceHolder = holder;
281            onSurfaceRedrawNeededNative(mNativeHandle, holder.getSurface());
282        }
283    }
284
285    public void surfaceDestroyed(SurfaceHolder holder) {
286        mCurSurfaceHolder = null;
287        if (!mDestroyed) {
288            onSurfaceDestroyedNative(mNativeHandle);
289        }
290    }
291
292    public void onInputQueueCreated(InputQueue queue) {
293        if (!mDestroyed) {
294            mCurInputQueue = queue;
295            onInputQueueCreatedNative(mNativeHandle, queue.getNativePtr());
296        }
297    }
298
299    public void onInputQueueDestroyed(InputQueue queue) {
300        if (!mDestroyed) {
301            onInputQueueDestroyedNative(mNativeHandle, queue.getNativePtr());
302            mCurInputQueue = null;
303        }
304    }
305
306    public void onGlobalLayout() {
307        mNativeContentView.getLocationInWindow(mLocation);
308        int w = mNativeContentView.getWidth();
309        int h = mNativeContentView.getHeight();
310        if (mLocation[0] != mLastContentX || mLocation[1] != mLastContentY
311                || w != mLastContentWidth || h != mLastContentHeight) {
312            mLastContentX = mLocation[0];
313            mLastContentY = mLocation[1];
314            mLastContentWidth = w;
315            mLastContentHeight = h;
316            if (!mDestroyed) {
317                onContentRectChangedNative(mNativeHandle, mLastContentX,
318                        mLastContentY, mLastContentWidth, mLastContentHeight);
319            }
320        }
321    }
322
323    void setWindowFlags(int flags, int mask) {
324        getWindow().setFlags(flags, mask);
325    }
326
327    void setWindowFormat(int format) {
328        getWindow().setFormat(format);
329    }
330
331    void showIme(int mode) {
332        mIMM.showSoftInput(mNativeContentView, mode);
333    }
334
335    void hideIme(int mode) {
336        mIMM.hideSoftInputFromWindow(mNativeContentView.getWindowToken(), mode);
337    }
338}
339