Android 滑动改变视频音量和视频缩略图

浏览数：33 / 时间：2015年06月11日

/**
   * 滑动改变音量
   * @param percent
   */
  private void onVolumn(float percent) {
　　 if(mVolumn == -1){
  　　　　mVolumn = mAudioManager.getStreamVolume(AudioManager.STREAM_MUSIC); //获取当前音量
            if(mVolumn < 0){
    　　　　 mVolumn = 0;
   　 }
      //显示
   　 mOperationBg.setImageResource(R.drawable.video_volumn_bg);
      mOperationVolumnBrightness.setVisibility(View.VISIBLE);
}
   int index = (int) (percent * mMaxVolume + mVolumn);
   if(index > mMaxVolume){
   　　index = mMaxVolume;
   } else if(index < 0){
   　　index = 0;
   }
   mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, index, 0);  //设置音量
   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 onBrightness(float percent) {
　　 if(mBrightness == -1f){
   　　　　mBrightness = getWindow().getAttributes().screenBrightness;
　　　　   if(mBrightness < 0.01f){
   　　　　　　mBrightness = 0.50f;
    　　　 }
   　　    mOperationBg.setImageResource(R.drawable.video_brightness_bg); //显示
   　　　 mOperationVolumnBrightness.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); //改变亮度
   　　LayoutParams lp = mOperationPercent.getLayoutParams();
  　　 lp.width = (int) (findViewById(R.id.operation_full).getLayoutParams().width * lpa.screenBrightness);
  　　 mOperationPercent.setLayoutParams(lp);
　}
private void init() {
　　String[] thumbColumns = new String[]{
       MediaStore.Video.Thumbnails.VIDEO_ID,
       MediaStore.Video.Thumbnails.DATA//缩略图路径
  };

String[] MediaColums = new String[]{
　　MediaStore.Video.Media._ID,
      MediaStore.Video.Media.TITLE,//视频名称
      MediaStore.Video.Media.DATA,//视频路径
//    MediaStore.Video.Media.DURATION,
//    MediaStore.Video.Media.SIZE
};

  cursor = this.managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, MediaColums, null, null, null);
  videoList = new ArrayList<VideoInfo>();
  if(cursor.moveToFirst()){
   do{
    VideoInfo info = new VideoInfo();
    //获取视频名称
    info.videoTitle = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.TITLE));
    //获取视频的路径
    info.videoPath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA));

    //获取视频缩略图的路径

    String selection = MediaStore.Video.Media._ID + "=?";

    int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media._ID));
    String[] selectionArgs = new String[]{
      id+""
    };

    Cursor thumbCursor = this.managedQuery(MediaStore.Video.Thumbnails.EXTERNAL_CONTENT_URI, thumbColumns, selection, selectionArgs, null);

    if(thumbCursor != null){
     //完成获取视频缩略图的路径
     info.thumbPath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Thumbnails.DATA));
//     info.thumbPath = thumbCursor.getString(thumbCursor.getColumnIndexOrThrow(MediaStore.Video.Thumbnails.DATA));
    }

    videoList.add(info);

   } while(cursor.moveToNext());
  }

  VideoAdapter adapter = new VideoAdapter(this, videoList);
  getListView().setAdapter(adapter);

}

static class VideoInfo {
  String thumbPath;//缩略图路径
  String videoTitle;//视频名字
  String videoPath;//视频的路径
}

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
   ViewHolder holder = null;
   if(convertView == null){
    holder = new ViewHolder();
    convertView = getLayoutInflater().inflate(R.layout.list_item, null);
    holder.thumbImage = (ImageView) convertView.findViewById(R.id.thumb_image);
    holder.videoTitle = (TextView) convertView.findViewById(R.id.video_title);
    convertView.setTag(holder);
   } else {
    holder = (ViewHolder) convertView.getTag();
   }

   //指定视频名字
   holder.videoTitle.setText(videoItems.get(position).videoTitle);

   //指定缩略图
   if(videoItems.get(position).thumbPath != null){
    Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(videoItems.get(position).thumbPath, Thumbnails.MINI_KIND);
    Bitmap bitmap1 = ThumbnailUtils.extractThumbnail(bitmap, 200, 200);
    BitmapDrawable db = new BitmapDrawable(bitmap1);
    holder.thumbImage.setImageDrawable(db);
   }

    return convertView;
  }

  class ViewHolder {
   ImageView thumbImage;
   TextView videoTitle;
  }

main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

    <io.vov.vitamio.widget.VideoView
        android:id="@+id/surfaceview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true" />

</RelativeLayout>

view_list.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >