Tips

1.根据图片名字获取图片id

/**
     * 根据图片名字获取图片id
     * @param imageName
     * @param context
     * @return
     */
    public static int getResource(String imageName, Context context) {
        int resId = context.getResources()
                .getIdentifier(imageName, "drawable", context.getPackageName());
        return resId;
    }

2.根据名字从Assets中读取文件，以图片为例子

 /**
     * 根据名字从Assets中读取图片
     * @param fileName
     * @return
     */
    public static Bitmap getImageFromAssetsFile(String fileName,Context context )
    {
        Bitmap image = null;
        AssetManager am =context.getResources().getAssets();
        try
        {
            InputStream is = am.open(fileName);
            image = BitmapFactory.decodeStream(is);
            is.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }

        return image;

    }

3.在service中的BroadcasReceiver遇到no empty constructor错误

内部的broadcastReceiver需要被动态注册，或者是static类。
这样就OK了

 private void registerReceiver(){
        xxxReceiver = new �xxxReceiver();
        IntentFilter filter = new IntentFilter();
        filter.addAction("xxxx");    
  }
或者
 public static class MusicReceiver extends BroadcastReceiver {
        public MusicReceiver() {
        }

        @Override
        public void onReceive(Context context, Intent intent) {
            switch (intent.getIntExtra(STATUS, 0)) {
                case PREVIOUS:
                    Log.e(TAG, "onReceive:前一首 " );
                    break;
                case PAUSE:
                    Log.e(TAG, "onReceive:暂停/播放 " );
                    break;
                case NEXT:
                    Log.e(TAG, "onReceive:下一首 " );
                    break;
            }
        }
    }
然后：
 <receiver android:name=".Service.MusicService$MusicReceiver">
            <intent-filter>
                <action android:name="com.example.yungui.music.UpdateStatus" />
            </intent-filter>
 </receiver>