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 <a href="https://github.com/googlesamples/android-ndk/tree/master/native-activity">sample
49 * native activity</a> is available in the NDK samples.
50 */
51public class NativeActivity extends Activity implements SurfaceHolder.Callback2,
52        InputQueue.Callback, OnGlobalLayoutListener {
53    /**
54     * Optional meta-that can be in the manifest for this component, specifying
55     * the name of the native shared library to load.  If not specified,
56     * "main" is used.
57     */
58    public static final String META_DATA_LIB_NAME = "android.app.lib_name";
59
60    /**
61     * Optional meta-that can be in the manifest for this component, specifying
62     * the name of the main entry point for this native activity in the
63     * {@link #META_DATA_LIB_NAME} native code.  If not specified,
64     * "ANativeActivity_onCreate" is used.
65     */
66    public static final String META_DATA_FUNC_NAME = "android.app.func_name";
67
68    private static final String KEY_NATIVE_SAVED_STATE = "android:native_state";
69
70    private NativeContentView mNativeContentView;
71    private InputMethodManager mIMM;
72
73    private long mNativeHandle;
74
75    private InputQueue mCurInputQueue;
76    private SurfaceHolder mCurSurfaceHolder;
77
78    final int[] mLocation = new int[2];
79    int mLastContentX;
80    int mLastContentY;
81    int mLastContentWidth;
82    int mLastContentHeight;
83
84    private boolean mDispatchingUnhandledKey;
85
86    private boolean mDestroyed;
87
88    private native long loadNativeCode(String path, String funcname, MessageQueue queue,
89            String internalDataPath, String obbPath, String externalDataPath, int sdkVersion,
90            AssetManager assetMgr, byte[] savedState, ClassLoader classLoader, String libraryPath);
91    private native String getDlError();
92    private native void unloadNativeCode(long handle);
93    private native void onStartNative(long handle);
94    private native void onResumeNative(long handle);
95    private native byte[] onSaveInstanceStateNative(long handle);
96    private native void onPauseNative(long handle);
97    private native void onStopNative(long handle);
98    private native void onConfigurationChangedNative(long handle);
99    private native void onLowMemoryNative(long handle);
100    private native void onWindowFocusChangedNative(long handle, boolean focused);
101    private native void onSurfaceCreatedNative(long handle, Surface surface);
102    private native void onSurfaceChangedNative(long handle, Surface surface,
103            int format, int width, int height);
104    private native void onSurfaceRedrawNeededNative(long handle, Surface surface);
105    private native void onSurfaceDestroyedNative(long handle);
106    private native void onInputQueueCreatedNative(long handle, long queuePtr);
107    private native void onInputQueueDestroyedNative(long handle, long queuePtr);
108    private native void onContentRectChangedNative(long handle, int x, int y, int w, int h);
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    @Override
123    protected void onCreate(Bundle savedInstanceState) {
124        String libname = "main";
125        String funcname = "ANativeActivity_onCreate";
126        ActivityInfo ai;
127
128        mIMM = getSystemService(InputMethodManager.class);
129
130        getWindow().takeSurface(this);
131        getWindow().takeInputQueue(this);
132        getWindow().setFormat(PixelFormat.RGB_565);
133        getWindow().setSoftInputMode(
134                WindowManager.LayoutParams.SOFT_INPUT_STATE_UNSPECIFIED
135                | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
136
137        mNativeContentView = new NativeContentView(this);
138        mNativeContentView.mActivity = this;
139        setContentView(mNativeContentView);
140        mNativeContentView.requestFocus();
141        mNativeContentView.getViewTreeObserver().addOnGlobalLayoutListener(this);
142
143        try {
144            ai = getPackageManager().getActivityInfo(
145                    getIntent().getComponent(), PackageManager.GET_META_DATA);
146            if (ai.metaData != null) {
147                String ln = ai.metaData.getString(META_DATA_LIB_NAME);
148                if (ln != null) libname = ln;
149                ln = ai.metaData.getString(META_DATA_FUNC_NAME);
150                if (ln != null) funcname = ln;
151            }
152        } catch (PackageManager.NameNotFoundException e) {
153            throw new RuntimeException("Error getting activity info", e);
154        }
155
156        BaseDexClassLoader classLoader = (BaseDexClassLoader) getClassLoader();
157        String path = classLoader.findLibrary(libname);
158
159        if (path == null) {
160            throw new IllegalArgumentException("Unable to find native library " + libname +
161                                               " using classloader: " + classLoader.toString());
162        }
163
164        byte[] nativeSavedState = savedInstanceState != null
165                ? savedInstanceState.getByteArray(KEY_NATIVE_SAVED_STATE) : null;
166
167        mNativeHandle = loadNativeCode(path, funcname, Looper.myQueue(),
168                getAbsolutePath(getFilesDir()), getAbsolutePath(getObbDir()),
169                getAbsolutePath(getExternalFilesDir(null)),
170                Build.VERSION.SDK_INT, getAssets(), nativeSavedState,
171                classLoader, classLoader.getLdLibraryPath());
172
173        if (mNativeHandle == 0) {
174            throw new UnsatisfiedLinkError(
175                    "Unable to load native library \"" + path + "\": " + getDlError());
176        }
177        super.onCreate(savedInstanceState);
178    }
179
180    private static String getAbsolutePath(File file) {
181        return (file != null) ? file.getAbsolutePath() : null;
182    }
183
184    @Override
185    protected void onDestroy() {
186        mDestroyed = true;
187        if (mCurSurfaceHolder != null) {
188            onSurfaceDestroyedNative(mNativeHandle);
189            mCurSurfaceHolder = null;
190        }
191        if (mCurInputQueue != null) {
192            onInputQueueDestroyedNative(mNativeHandle, mCurInputQueue.getNativePtr());
193            mCurInputQueue = null;
194        }
195        unloadNativeCode(mNativeHandle);
196        super.onDestroy();
197    }
198
199    @Override
200    protected void onPause() {
201        super.onPause();
202        onPauseNative(mNativeHandle);
203    }
204
205    @Override
206    protected void onResume() {
207        super.onResume();
208        onResumeNative(mNativeHandle);
209    }
210
211    @Override
212    protected void onSaveInstanceState(Bundle outState) {
213        super.onSaveInstanceState(outState);
214        byte[] state = onSaveInstanceStateNative(mNativeHandle);
215        if (state != null) {
216            outState.putByteArray(KEY_NATIVE_SAVED_STATE, state);
217        }
218    }
219
220    @Override
221    protected void onStart() {
222        super.onStart();
223        onStartNative(mNativeHandle);
224    }
225
226    @Override
227    protected void onStop() {
228        super.onStop();
229        onStopNative(mNativeHandle);
230    }
231
232    @Override
233    public void onConfigurationChanged(Configuration newConfig) {
234        super.onConfigurationChanged(newConfig);
235        if (!mDestroyed) {
236            onConfigurationChangedNative(mNativeHandle);
237        }
238    }
239
240    @Override
241    public void onLowMemory() {
242        super.onLowMemory();
243        if (!mDestroyed) {
244            onLowMemoryNative(mNativeHandle);
245        }
246    }
247
248    @Override
249    public void onWindowFocusChanged(boolean hasFocus) {
250        super.onWindowFocusChanged(hasFocus);
251        if (!mDestroyed) {
252            onWindowFocusChangedNative(mNativeHandle, hasFocus);
253        }
254    }
255
256    public void surfaceCreated(SurfaceHolder holder) {
257        if (!mDestroyed) {
258            mCurSurfaceHolder = holder;
259            onSurfaceCreatedNative(mNativeHandle, holder.getSurface());
260        }
261    }
262
263    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
264        if (!mDestroyed) {
265            mCurSurfaceHolder = holder;
266            onSurfaceChangedNative(mNativeHandle, holder.getSurface(), format, width, height);
267        }
268    }
269
270    public void surfaceRedrawNeeded(SurfaceHolder holder) {
271        if (!mDestroyed) {
272            mCurSurfaceHolder = holder;
273            onSurfaceRedrawNeededNative(mNativeHandle, holder.getSurface());
274        }
275    }
276
277    public void surfaceDestroyed(SurfaceHolder holder) {
278        mCurSurfaceHolder = null;
279        if (!mDestroyed) {
280            onSurfaceDestroyedNative(mNativeHandle);
281        }
282    }
283
284    public void onInputQueueCreated(InputQueue queue) {
285        if (!mDestroyed) {
286            mCurInputQueue = queue;
287            onInputQueueCreatedNative(mNativeHandle, queue.getNativePtr());
288        }
289    }
290
291    public void onInputQueueDestroyed(InputQueue queue) {
292        if (!mDestroyed) {
293            onInputQueueDestroyedNative(mNativeHandle, queue.getNativePtr());
294            mCurInputQueue = null;
295        }
296    }
297
298    public void onGlobalLayout() {
299        mNativeContentView.getLocationInWindow(mLocation);
300        int w = mNativeContentView.getWidth();
301        int h = mNativeContentView.getHeight();
302        if (mLocation[0] != mLastContentX || mLocation[1] != mLastContentY
303                || w != mLastContentWidth || h != mLastContentHeight) {
304            mLastContentX = mLocation[0];
305            mLastContentY = mLocation[1];
306            mLastContentWidth = w;
307            mLastContentHeight = h;
308            if (!mDestroyed) {
309                onContentRectChangedNative(mNativeHandle, mLastContentX,
310                        mLastContentY, mLastContentWidth, mLastContentHeight);
311            }
312        }
313    }
314
315    void setWindowFlags(int flags, int mask) {
316        getWindow().setFlags(flags, mask);
317    }
318
319    void setWindowFormat(int format) {
320        getWindow().setFormat(format);
321    }
322
323    void showIme(int mode) {
324        mIMM.showSoftInput(mNativeContentView, mode);
325    }
326
327    void hideIme(int mode) {
328        mIMM.hideSoftInputFromWindow(mNativeContentView.getWindowToken(), mode);
329    }
330}
331