Question

想要在表面视图中调整视频大小

我正在使用Surface视图和视频持有者在Media Player中播放视频...

//但是在某些设备上实施MediaPlayerControl时，请说Micromax，iball，Akash平板电脑，它提供了ACRA错误跟踪跟踪的抽象方法错误。

现在我想解决上述问题：

如何使媒体播放器控件在所有设备中都处于活动状态而不会由于抽象方法而导致某些媒体控制器崩溃设备
如何调整视频的表面视图大小。

该代码在 samsung galaxy gt p1000 OS 2.2 和一些更便宜的设备WorldTeck等上运行f9。

但 Creative ziio 7操作系统版本为2.2.1（480 * 800） 分辨率密度为160 dpi 视频似乎被缩放并从边缘切断

代码如下所示：

/* Media Player Control is commented due to force close in some devices say *micromax,Creative ziio, akash etc */

    public class VideoViewerActivity extends Activity implements
            OnBufferingUpdateListener, OnCompletionListener, OnPreparedListener,
            OnVideoSizeChangedListener, SurfaceHolder.Callback {
        // implements  ERROR in some devices , MediaPlayerControl
        private static final String TAG = "MediaPlayerDemo";
        private int mVideoWidth;
        private int mVideoHeight;
        private MediaPlayer mMediaPlayer;
        private SurfaceView mPreview;
        private SurfaceHolder holder;
        private String path = "";
        private Bundle extras;
        private static final String MEDIA = "media";
        private static final int LOCAL_AUDIO = 1;
        private static final int STREAM_AUDIO = 2;
        private static final int RESOURCES_AUDIO = 3;
        private static final int LOCAL_VIDEO = 4;
        private static final int STREAM_VIDEO = 5;
        private boolean mIsVideoSizeKnown = false;
        private boolean mIsVideoReadyToBePlayed = false;
        /* ERROR In Abstract method implementation in the other devices */
        // private MediaController mediaController;
        private Context context;
        private final Handler handler = new Handler();

        /**
         * 
         * Called when the activity is first created.
         */
        @Override
        public void onCreate(Bundle icicle) {
            super.onCreate(icicle);
            setContentView(R.layout.video_layout);
            context = this;
            path = getIntent().getExtras().getString("media");

            Log.v("arpit", "path " + path);
            mPreview = (SurfaceView) findViewById(R.id.surfaceview1);
            holder = mPreview.getHolder();
            holder.addCallback(this);
            holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
            extras = getIntent().getExtras();

        }

        private void playVideo() {
            doCleanUp();
            try {

                // Create a new media player and set the listeners
                File f = new File(path);
                // FileInputStream in = new FileInputStream(f);

                RandomAccessFile randomAccessFile = new RandomAccessFile(f, "r");
                // randomAccessFile.skipBytes(1024);
                FileDescriptor fileDescriptor = randomAccessFile.getFD();

                mMediaPlayer = new MediaPlayer();
                mMediaPlayer.setDataSource(fileDescriptor, Constant.key1.length
                        + Data.deviceID.length(), f.length());

                mMediaPlayer.setDisplay(holder);
                mMediaPlayer.prepare();
                mMediaPlayer.setOnBufferingUpdateListener(this);
                mMediaPlayer.setOnCompletionListener(this);
                mMediaPlayer.setOnPreparedListener(this);
                mMediaPlayer.setOnVideoSizeChangedListener(this);
                mMediaPlayer.setScreenOnWhilePlaying(true);

                // mediaController = new MediaController(this);
                mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

            } catch (Exception e) {
                Log.e(TAG, "error: " + e.getMessage(), e);
                Toast.makeText(context, "supported video was not found",
                        Toast.LENGTH_SHORT).show();
                finish();
            }
        }

        public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
            Log.v(TAG, "onVideoSizeChanged called");
            if (width == 0 || height == 0) {
                Log.e(TAG, "invalid video width(" + width + ") or height(" + height
                        + ")");
                return;
            }
            mIsVideoSizeKnown = true;
            mVideoWidth = width;
            mVideoHeight = height;
            if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) {
                startVideoPlayback();
            }
        }


        public void surfaceDestroyed(SurfaceHolder surfaceholder) {
            Log.d(TAG, "surfaceDestroyed called");
        }

        public void surfaceCreated(SurfaceHolder holder) {
            Log.d(TAG, "surfaceCreated called");
            playVideo();

        }

        private void doCleanUp() {
            mVideoWidth = 0;
            mVideoHeight = 0;
            mIsVideoReadyToBePlayed = false;
            mIsVideoSizeKnown = false;
        }

        private void startVideoPlayback() {
            Log.v(TAG, "startVideoPlayback");
//also tried and used the below line but nothing good 


// holder.setFixedSize(480, 800);

holder.setFixedSize(mVideoWidth, mVideoHeight);

mMediaPlayer.start();

        }


    }

Answer 1

我使用TextureView而不是表面视图（它允许旋转视频）并在其中适当地设置其setScale {X | Y}（）：

@Override
public void onVideoSizeChanged(MediaPlayer mp, int w, int h) {
    if (w > 0 && h > 0) {
        RelativeLayout.LayoutParams l;
        DisplayMetrics metrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metrics);
        l = new RelativeLayout.LayoutParams(metrics.heightPixels, metrics.widthPixels);
        l.addRule(RelativeLayout.CENTER_IN_PARENT, -1);
        float scale = (metrics.heightPixels * 1.0f) / (metrics.widthPixels * 1.0f);
        videoView.setScaleX(scale);
        videoView.setLayoutParams(l);
        Log.d(YourApp.TAG, "video size: " + mp.getVideoWidth() + "x" + mp.getVideoHeight() + " vertical scale: " + scale);
    }
}

请注意，我已经旋转了我的视频，这就是我为X设置比例的原因。

Answer 2

嗨arpit我也在使用与你提到的播放视频文件相同的设备，我在向视频播放器应用控件时遇到了同样的问题（抽象方法不可用）。

根据我对该主题的研发，我得出的结论是，定制的Android操作系统和这些设备的硬件彼此不兼容，因为与三星设备相比质量非常差，虽然它们在Android操作系统中但是不受这些设备的支持，所以有很多方法。

所以我认为在这些设备中没有针对此类问题的解决方案。

在开发任何项目时，尝试使用标准设备进行聚焦。这可能会对你有所帮助。

感谢。 :)

android如何在媒体播放器的表面视图中调整视频宽度和高度

2 个答案: