使用Vitamio打造自己的Android万能播放器（2）—— 手势控制亮度、音量、缩放

<? xml version="1.0" encoding="utf-8" ?>
< RelativeLayout  xmlns:android ="http://schemas.android.com/apk/res/android"
    android:orientation ="vertical"  android:layout_width ="match_parent"
    android:layout_height ="match_parent" >
     < io.vov.vitamio.widget.VideoView
         android:id ="@+id/surface_view"  android:layout_width ="match_parent"
        android:layout_height ="match_parent"  android:layout_centerHorizontal ="true"
        android:layout_centerVertical ="true"   />
     < FrameLayout  android:id ="@+id/operation_volume_brightness"
        android:visibility ="invisible"  android:layout_centerInParent ="true"
        android:layout_width ="wrap_content"  android:layout_height ="wrap_content"
        android:background ="#00000000"  android:orientation ="horizontal"
        android:padding ="0dip" >
         < ImageView  android:id ="@+id/operation_bg"
            android:layout_gravity ="center"  android:src ="@drawable/video_volumn_bg"
            android:layout_width ="wrap_content"  android:layout_height ="wrap_content"   />
         < FrameLayout  android:layout_gravity ="bottom|center_horizontal"
            android:layout_width ="wrap_content"  android:layout_height ="wrap_content"
            android:paddingBottom ="25dip" >
             < ImageView  android:id ="@+id/operation_full"
                android:layout_gravity ="left"  android:src ="@drawable/video_num_bg"
                android:layout_width ="94dip"  android:layout_height ="wrap_content"   />
             < ImageView  android:id ="@+id/operation_percent"
                android:layout_gravity ="left"  android:src ="@drawable/video_num_front"
                android:layout_width ="0dip"  android:layout_height ="wrap_content"
                android:scaleType ="matrix"   />
         </ FrameLayout >
     </ FrameLayout >

     /**
     * 
     * Android万能播放器
     * 
     *  @author  农民伯伯
     *  @version  2012-5-22
     * 
      */
     public  class VideoViewDemo  extends Activity {
    
         private String path = Environment.getExternalStorageDirectory()
                + "/Moon.mp4";
         private VideoView mVideoView;
         private View mVolumeBrightnessLayout;
         private ImageView mOperationBg;
         private ImageView mOperationPercent;
         private AudioManager mAudioManager;
         /**  最大声音  */
         private  int mMaxVolume;
         /**  当前声音  */
         private  int mVolume = -1;
         /**  当前亮度  */
         private  float mBrightness = -1f;
         /**  当前缩放模式  */
         private  int mLayout = VideoView.VIDEO_LAYOUT_ZOOM;
         private GestureDetector mGestureDetector;
         private MediaController mMediaController;
    
        @Override
         public  void onCreate(Bundle icicle) {
             super.onCreate(icicle);
            setContentView(R.layout.videoview);
            mVideoView = (VideoView) findViewById(R.id.surface_view);
            mVolumeBrightnessLayout = findViewById(R.id.operation_volume_brightness);
            mOperationBg = (ImageView) findViewById(R.id.operation_bg);
            mOperationPercent = (ImageView) findViewById(R.id.operation_percent);
    
            mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
            mMaxVolume = mAudioManager
                    .getStreamMaxVolume(AudioManager.STREAM_MUSIC);
            mVideoView.setVideoPath(path);
            mMediaController =  new MediaController( this);
            mVideoView.setMediaController(mMediaController);
            mVideoView.requestFocus();
    
            mGestureDetector =  new GestureDetector( this,  new MyGestureListener());
        }
    
        @Override
         public  boolean onTouchEvent(MotionEvent event) {
             if (mGestureDetector.onTouchEvent(event))
                 return  true;
    
             //  处理手势结束
             switch (event.getAction() & MotionEvent.ACTION_MASK) {
             case MotionEvent.ACTION_UP:
                endGesture();
                 break;
            }
    
             return  super.onTouchEvent(event);
        }
    
         /**  手势结束  */
         private  void endGesture() {
            mVolume = -1;
            mBrightness = -1f;
    
             //  隐藏
            mDismissHandler.removeMessages(0);
            mDismissHandler.sendEmptyMessageDelayed(0, 500);
        }
    
         private  class MyGestureListener  extends SimpleOnGestureListener {
    
             /**  双击  */
            @Override
             public  boolean onDoubleTap(MotionEvent e) {
                 if (mLayout == VideoView.VIDEO_LAYOUT_ZOOM)
                    mLayout = VideoView.VIDEO_LAYOUT_ORIGIN;
                 else
                    mLayout++;
                 if (mVideoView !=  null)
                    mVideoView.setVideoLayout(mLayout, 0);
                 return  true;
            }
    
             /**  滑动  */
            @Override
             public  boolean onScroll(MotionEvent e1, MotionEvent e2,
                     float distanceX,  float distanceY) {
                 float mOldX = e1.getX(), mOldY = e1.getY();
                 int y = ( int) e2.getRawY();
                Display disp = getWindowManager().getDefaultDisplay();
                 int windowWidth = disp.getWidth();
                 int windowHeight = disp.getHeight();
    
                 if (mOldX > windowWidth * 4.0 / 5) //  右边滑动
                    onVolumeSlide((mOldY - y) / windowHeight);
                 else  if (mOldX < windowWidth / 5.0) //  左边滑动
                    onBrightnessSlide((mOldY - y) / windowHeight);
    
                 return  super.onScroll(e1, e2, distanceX, distanceY);
            }
        }
    
         /**  定时隐藏  */
         private Handler mDismissHandler =  new Handler() {
            @Override
             public  void handleMessage(Message msg) {
                mVolumeBrightnessLayout.setVisibility(View.GONE);
            }
        };
    
         /**
         * 滑动改变声音大小
         * 
         *  @param  percent
          */
         private  void onVolumeSlide( float percent) {
             if (mVolume == -1) {
                mVolume = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
                 if (mVolume < 0)
                    mVolume = 0;
    
                 //  显示
                mOperationBg.setImageResource(R.drawable.video_volumn_bg);
                mVolumeBrightnessLayout.setVisibility(View.VISIBLE);
            }
    
             int index = ( int) (percent * mMaxVolume) + mVolume;
             if (index > mMaxVolume)
                index = mMaxVolume;
             else  if (index < 0)
                index = 0;
    
             //  变更声音
            mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, index, 0);
    
             //  变更进度条
            ViewGroup.LayoutParams lp = mOperationPercent.getLayoutParams();
            lp.width = findViewById(R.id.operation_full).getLayoutParams().width
                    * index / mMaxVolume;
            mOperationPercent.setLayoutParams(lp);
        }
    
         /**
         * 滑动改变亮度
         * 
         *  @param  percent
          */
         private  void onBrightnessSlide( float percent) {
             if (mBrightness < 0) {
                mBrightness = getWindow().getAttributes().screenBrightness;
                 if (mBrightness <= 0.00f)
                    mBrightness = 0.50f;
                 if (mBrightness < 0.01f)
                    mBrightness = 0.01f;
    
                 //  显示
                mOperationBg.setImageResource(R.drawable.video_brightness_bg);
                mVolumeBrightnessLayout.setVisibility(View.VISIBLE);
            }
            WindowManager.LayoutParams lpa = getWindow().getAttributes();
            lpa.screenBrightness = mBrightness + percent;
             if (lpa.screenBrightness > 1.0f)
                lpa.screenBrightness = 1.0f;
             else  if (lpa.screenBrightness < 0.01f)
                lpa.screenBrightness = 0.01f;
            getWindow().setAttributes(lpa);
    
            ViewGroup.LayoutParams lp = mOperationPercent.getLayoutParams();
            lp.width = ( int) (findViewById(R.id.operation_full).getLayoutParams().width * lpa.screenBrightness);
            mOperationPercent.setLayoutParams(lp);
        }
    
        @Override
         public  void onConfigurationChanged(Configuration newConfig) {
             if (mVideoView !=  null)
                mVideoView.setVideoLayout(mLayout, 0);
             super.onConfigurationChanged(newConfig);
        }