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 dalvik.system.BaseDexClassLoader;
39
40import java.io.File;
41
42/**
43 * Convenience for implementing an activity that will be implemented
44 * purely in native code.  That is, a game (or game-like thing).  There
45 * is no need to derive from this class; you can simply declare it in your
46 * manifest, and use the NDK APIs from there.
47 *
48 * <p>A typical manifest would look like:
49 *
50 * {@sample development/ndk/platforms/android-9/samples/native-activity/AndroidManifest.xml
51 *      manifest}
52 *
53 * <p>A very simple example of native code that is run by NativeActivity
54 * follows.  This reads input events from the user and uses OpenGLES to
55 * draw into the native activity's window.
56 *
57 * {@sample development/ndk/platforms/android-9/samples/native-activity/jni/main.c all}
58 */
59public class NativeActivity extends Activity implements SurfaceHolder.Callback2,
60        InputQueue.Callback, OnGlobalLayoutListener {
61    /**
62     * Optional meta-that can be in the manifest for this component, specifying
63     * the name of the native shared library to load.  If not specified,
64     * "main" is used.
65     */
66    public static final String META_DATA_LIB_NAME = "android.app.lib_name";
67
68    /**
69     * Optional meta-that can be in the manifest for this component, specifying
70     * the name of the main entry point for this native activity in the
71     * {@link #META_DATA_LIB_NAME} native code.  If not specified,
72     * "ANativeActivity_onCreate" is used.
73     */
74    public static final String META_DATA_FUNC_NAME = "android.app.func_name";
75
76    private static final String KEY_NATIVE_SAVED_STATE = "android:native_state";
77
78    private NativeContentView mNativeContentView;
79    private InputMethodManager mIMM;
80
81    private long mNativeHandle;
82
83    private InputQueue mCurInputQueue;
84    private SurfaceHolder mCurSurfaceHolder;
85
86    final int[] mLocation = new int[2];
87    int mLastContentX;
88    int mLastContentY;
89    int mLastContentWidth;
90    int mLastContentHeight;
91
92    private boolean mDispatchingUnhandledKey;
93
94    private boolean mDestroyed;
95
96    private native long loadNativeCode(String path, String funcname, MessageQueue queue,
97            String internalDataPath, String obbPath, String externalDataPath, int sdkVersion,
98            AssetManager assetMgr, byte[] savedState, ClassLoader classLoader, String libraryPath);
99    private native String getDlError();
100    private native void unloadNativeCode(long handle);
101    private native void onStartNative(long handle);
102    private native void onResumeNative(long handle);
103    private native byte[] onSaveInstanceStateNative(long handle);
104    private native void onPauseNative(long handle);
105    private native void onStopNative(long handle);
106    private native void onConfigurationChangedNative(long handle);
107    private native void onLowMemoryNative(long handle);
108    private native void onWindowFocusChangedNative(long handle, boolean focused);
109    private native void onSurfaceCreatedNative(long handle, Surface surface);
110    private native void onSurfaceChangedNative(long handle, Surface surface,
111            int format, int width, int height);
112    private native void onSurfaceRedrawNeededNative(long handle, Surface surface);
113    private native void onSurfaceDestroyedNative(long handle);
114    private native void onInputQueueCreatedNative(long handle, long queuePtr);
115    private native void onInputQueueDestroyedNative(long handle, long queuePtr);
116    private native void onContentRectChangedNative(long handle, int x, int y, int w, int h);
117
118    static class NativeContentView extends View {
119        NativeActivity mActivity;
120
121        public NativeContentView(Context context) {
122            super(context);
123        }
124
125        public NativeContentView(Context context, AttributeSet attrs) {
126            super(context, attrs);
127        }
128    }
129
130    @Override
131    protected void onCreate(Bundle savedInstanceState) {
132        String libname = "main";
133        String funcname = "ANativeActivity_onCreate";
134        ActivityInfo ai;
135
136        mIMM = getSystemService(InputMethodManager.class);
137
138        getWindow().takeSurface(this);
139        getWindow().takeInputQueue(this);
140        getWindow().setFormat(PixelFormat.RGB_565);
141        getWindow().setSoftInputMode(
142                WindowManager.LayoutParams.SOFT_INPUT_STATE_UNSPECIFIED
143                | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
144
145        mNativeContentView = new NativeContentView(this);
146        mNativeContentView.mActivity = this;
147        setContentView(mNativeContentView);
148        mNativeContentView.requestFocus();
149        mNativeContentView.getViewTreeObserver().addOnGlobalLayoutListener(this);
150
151        try {
152            ai = getPackageManager().getActivityInfo(
153                    getIntent().getComponent(), PackageManager.GET_META_DATA);
154            if (ai.metaData != null) {
155                String ln = ai.metaData.getString(META_DATA_LIB_NAME);
156                if (ln != null) libname = ln;
157                ln = ai.metaData.getString(META_DATA_FUNC_NAME);
158                if (ln != null) funcname = ln;
159            }
160        } catch (PackageManager.NameNotFoundException e) {
161            throw new RuntimeException("Error getting activity info", e);
162        }
163
164        BaseDexClassLoader classLoader = (BaseDexClassLoader) getClassLoader();
165        String path = classLoader.findLibrary(libname);
166
167        if (path == null) {
168            throw new IllegalArgumentException("Unable to find native library " + libname +
169                                               " using classloader: " + classLoader.toString());
170        }
171
172        byte[] nativeSavedState = savedInstanceState != null
173                ? savedInstanceState.getByteArray(KEY_NATIVE_SAVED_STATE) : null;
174
175        mNativeHandle = loadNativeCode(path, funcname, Looper.myQueue(),
176                getAbsolutePath(getFilesDir()), getAbsolutePath(getObbDir()),
177                getAbsolutePath(getExternalFilesDir(null)),
178                Build.VERSION.SDK_INT, getAssets(), nativeSavedState,
179                classLoader, classLoader.getLdLibraryPath());
180
181        if (mNativeHandle == 0) {
182            throw new UnsatisfiedLinkError(
183                    "Unable to load native library \"" + path + "\": " + getDlError());
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