content: /*
   * Copyright (C) 2010 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package android.app;
  
  import android.annotation.UnsupportedAppUsage;
  import android.content.Context;
  import android.content.pm.ActivityInfo;
  import android.content.pm.PackageManager;
  import android.content.res.AssetManager;
  import android.content.res.Configuration;
  import android.graphics.PixelFormat;
  import android.os.Build;
  import android.os.Bundle;
  import android.os.Looper;
  import android.os.MessageQueue;
  import android.util.AttributeSet;
  import android.view.InputQueue;
  import android.view.Surface;
  import android.view.SurfaceHolder;
  import android.view.View;
  import android.view.ViewTreeObserver.OnGlobalLayoutListener;
  import android.view.WindowManager;
  import android.view.inputmethod.InputMethodManager;
  
  import dalvik.system.BaseDexClassLoader;
  
  import java.io.File;
  
  /**
   * Convenience for implementing an activity that will be implemented
   * purely in native code.  That is, a game (or game-like thing).  There
   * is no need to derive from this class; you can simply declare it in your
   * manifest, and use the NDK APIs from there.
   *
   * <p>A <a href="https://github.com/googlesamples/android-ndk/tree/master/native-activity">sample
   * native activity</a> is available in the NDK samples.
   */
  public class NativeActivity extends Activity implements SurfaceHolder.Callback2,
          InputQueue.Callback, OnGlobalLayoutListener {
      /**
       * Optional meta-that can be in the manifest for this component, specifying
       * the name of the native shared library to load.  If not specified,
       * "main" is used.
       */
      public static final String META_DATA_LIB_NAME = "android.app.lib_name";
      
      /**
       * Optional meta-that can be in the manifest for this component, specifying
       * the name of the main entry point for this native activity in the
       * {@link #META_DATA_LIB_NAME} native code.  If not specified,
       * "ANativeActivity_onCreate" is used.
       */
      public static final String META_DATA_FUNC_NAME = "android.app.func_name";
      
      private static final String KEY_NATIVE_SAVED_STATE = "android:native_state";
  
      private NativeContentView mNativeContentView;
      private InputMethodManager mIMM;
  
      @UnsupportedAppUsage
      private long mNativeHandle;
      
      private InputQueue mCurInputQueue;
      private SurfaceHolder mCurSurfaceHolder;
      
      final int[] mLocation = new int[2];
      int mLastContentX;
      int mLastContentY;
      int mLastContentWidth;
      int mLastContentHeight;
  
      private boolean mDispatchingUnhandledKey;
  
      private boolean mDestroyed;
      
      @UnsupportedAppUsage
      private native long loadNativeCode(String path, String funcname, MessageQueue queue,
              String internalDataPath, String obbPath, String externalDataPath, int sdkVersion,
              AssetManager assetMgr, byte[] savedState, ClassLoader classLoader, String libraryPath);
      private native String getDlError();
      private native void unloadNativeCode(long handle);
      private native void onStartNative(long handle);
      private native void onResumeNative(long handle);
      private native byte[] onSaveInstanceStateNative(long handle);
      private native void onPauseNative(long handle);
      private native void onStopNative(long handle);
      private native void onConfigurationChangedNative(long handle);
      private native void onLowMemoryNative(long handle);
      private native void onWindowFocusChangedNative(long handle, boolean focused);
      private native void onSurfaceCreatedNative(long handle, Surface surface);
      private native void onSurfaceChangedNative(long handle, Surface surface,
              int format, int width, int height);
      private native void onSurfaceRedrawNeededNative(long handle, Surface surface);
      private native void onSurfaceDestroyedNative(long handle);
      private native void onInputQueueCreatedNative(long handle, long queuePtr);
      private native void onInputQueueDestroyedNative(long handle, long queuePtr);
      private native void onContentRectChangedNative(long handle, int x, int y, int w, int h);
  
      static class NativeContentView extends View {
          NativeActivity mActivity;
  
          public NativeContentView(Context context) {
              super(context);
          }
  
          public NativeContentView(Context context, AttributeSet attrs) {
              super(context, attrs);
          }
      }
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          String libname = "main";
          String funcname = "ANativeActivity_onCreate";
          ActivityInfo ai;
  
          mIMM = getSystemService(InputMethodManager.class);
  
          getWindow().takeSurface(this);
          getWindow().takeInputQueue(this);
          getWindow().setFormat(PixelFormat.RGB_565);
          getWindow().setSoftInputMode(
                  WindowManager.LayoutParams.SOFT_INPUT_STATE_UNSPECIFIED
                  | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
  
          mNativeContentView = new NativeContentView(this);
          mNativeContentView.mActivity = this;
          setContentView(mNativeContentView);
          mNativeContentView.requestFocus();
          mNativeContentView.getViewTreeObserver().addOnGlobalLayoutListener(this);
          
          try {
              ai = getPackageManager().getActivityInfo(
                      getIntent().getComponent(), PackageManager.GET_META_DATA);
              if (ai.metaData != null) {
                  String ln = ai.metaData.getString(META_DATA_LIB_NAME);
                  if (ln != null) libname = ln;
                  ln = ai.metaData.getString(META_DATA_FUNC_NAME);
                  if (ln != null) funcname = ln;
              }
          } catch (PackageManager.NameNotFoundException e) {
              throw new RuntimeException("Error getting activity info", e);
          }
  
          BaseDexClassLoader classLoader = (BaseDexClassLoader) getClassLoader();
          String path = classLoader.findLibrary(libname);
  
          if (path == null) {
              throw new IllegalArgumentException("Unable to find native library " + libname +
                                                 " using classloader: " + classLoader.toString());
          }
          
          byte[] nativeSavedState = savedInstanceState != null
                  ? savedInstanceState.getByteArray(KEY_NATIVE_SAVED_STATE) : null;
  
          mNativeHandle = loadNativeCode(path, funcname, Looper.myQueue(),
                  getAbsolutePath(getFilesDir()), getAbsolutePath(getObbDir()),
                  getAbsolutePath(getExternalFilesDir(null)),
                  Build.VERSION.SDK_INT, getAssets(), nativeSavedState,
                  classLoader, classLoader.getLdLibraryPath());
  
          if (mNativeHandle == 0) {
              throw new UnsatisfiedLinkError(
                      "Unable to load native library \"" + path + "\": " + getDlError());
          }
          super.onCreate(savedInstanceState);
      }
  
      private static String getAbsolutePath(File file) {
          return (file != null) ? file.getAbsolutePath() : null;
      }
  
      @Override
      protected void onDestroy() {
          mDestroyed = true;
          if (mCurSurfaceHolder != null) {
              onSurfaceDestroyedNative(mNativeHandle);
              mCurSurfaceHolder = null;
          }
          if (mCurInputQueue != null) {
              onInputQueueDestroyedNative(mNativeHandle, mCurInputQueue.getNativePtr());
              mCurInputQueue = null;
          }
          unloadNativeCode(mNativeHandle);
          super.onDestroy();
      }
  
      @Override
      protected void onPause() {
          super.onPause();
          onPauseNative(mNativeHandle);
      }
  
      @Override
      protected void onResume() {
          super.onResume();
          onResumeNative(mNativeHandle);
      }
  
      @Override
      protected void onSaveInstanceState(Bundle outState) {
          super.onSaveInstanceState(outState);
          byte[] state = onSaveInstanceStateNative(mNativeHandle);
          if (state != null) {
              outState.putByteArray(KEY_NATIVE_SAVED_STATE, state);
          }
      }
  
      @Override
      protected void onStart() {
          super.onStart();
          onStartNative(mNativeHandle);
      }
  
      @Override
      protected void onStop() {
          super.onStop();
          onStopNative(mNativeHandle);
      }
  
      @Override
      public void onConfigurationChanged(Configuration newConfig) {
          super.onConfigurationChanged(newConfig);
          if (!mDestroyed) {
              onConfigurationChangedNative(mNativeHandle);
          }
      }
  
      @Override
      public void onLowMemory() {
          super.onLowMemory();
          if (!mDestroyed) {
              onLowMemoryNative(mNativeHandle);
          }
      }
  
      @Override
      public void onWindowFocusChanged(boolean hasFocus) {
          super.onWindowFocusChanged(hasFocus);
          if (!mDestroyed) {
              onWindowFocusChangedNative(mNativeHandle, hasFocus);
          }
      }
      
      public void surfaceCreated(SurfaceHolder holder) {
          if (!mDestroyed) {
              mCurSurfaceHolder = holder;
              onSurfaceCreatedNative(mNativeHandle, holder.getSurface());
          }
      }
      
      public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
          if (!mDestroyed) {
              mCurSurfaceHolder = holder;
              onSurfaceChangedNative(mNativeHandle, holder.getSurface(), format, width, height);
          }
      }
      
      public void surfaceRedrawNeeded(SurfaceHolder holder) {
          if (!mDestroyed) {
              mCurSurfaceHolder = holder;
              onSurfaceRedrawNeededNative(mNativeHandle, holder.getSurface());
          }
      }
  
      public void surfaceDestroyed(SurfaceHolder holder) {
          mCurSurfaceHolder = null;
          if (!mDestroyed) {
              onSurfaceDestroyedNative(mNativeHandle);
          }
      }
      
      public void onInputQueueCreated(InputQueue queue) {
          if (!mDestroyed) {
              mCurInputQueue = queue;
              onInputQueueCreatedNative(mNativeHandle, queue.getNativePtr());
          }
      }
      
      public void onInputQueueDestroyed(InputQueue queue) {
          if (!mDestroyed) {
              onInputQueueDestroyedNative(mNativeHandle, queue.getNativePtr());
              mCurInputQueue = null;
          }
      }
      
      public void onGlobalLayout() {
          mNativeContentView.getLocationInWindow(mLocation);
          int w = mNativeContentView.getWidth();
          int h = mNativeContentView.getHeight();
          if (mLocation[0] != mLastContentX || mLocation[1] != mLastContentY
                  || w != mLastContentWidth || h != mLastContentHeight) {
              mLastContentX = mLocation[0];
              mLastContentY = mLocation[1];
              mLastContentWidth = w;
              mLastContentHeight = h;
              if (!mDestroyed) {
                  onContentRectChangedNative(mNativeHandle, mLastContentX,
                          mLastContentY, mLastContentWidth, mLastContentHeight);
              }
          }
      }
  
      @UnsupportedAppUsage
      void setWindowFlags(int flags, int mask) {
          getWindow().setFlags(flags, mask);
      }
      
      @UnsupportedAppUsage
      void setWindowFormat(int format) {
          getWindow().setFormat(format);
      }
  
      @UnsupportedAppUsage
      void showIme(int mode) {
          mIMM.showSoftInput(mNativeContentView, mode);
      }
  
      @UnsupportedAppUsage
      void hideIme(int mode) {
          mIMM.hideSoftInputFromWindow(mNativeContentView.getWindowToken(), mode);
      }
  }
  