Nexus6和MediaPlayer.VIDEO_SCALING_MODE_SCALE_TO_FIT_WITH_CROPPING)；

Question

嗨，我正在尝试实现一个由视频文件制作的背景活动。下面发布的解决方案在大多数设备上都有效，除了nexus6 android5.1。视频正在工作，已缩放但未被裁剪，因此不会保留纵横比。

测试了Galaxy Note，HTC One m7，Xperia Z3，Nexus5。

代码如下：

public class MainActivity extends ActionBarActivity implements SurfaceHolder.Callback, OnClickListener
{
    private static final int VIDEO_START_HACK_DELAY = 0;

    private static final String BG_VIDEO_PATH = "/raw/construction";
    private SurfaceView mSurface;

    private Button mTour, mLogin;

    private MediaPlayer mMediaPlayer;

    private Handler mHandler = new Handler();

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_start_main);
        setupUI();
    }

    private void setupUI()
    {
        mMediaPlayer = new MediaPlayer();
        mSurface = (SurfaceView) findViewById(R.id.surface);
        SurfaceHolder holder = mSurface.getHolder();
        holder.addCallback(this);

        mTour = (Button) findViewById(R.id.tour);
        mLogin = (Button) findViewById(R.id.login);

        mTour.setOnClickListener(this);
        mLogin.setOnClickListener(this);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder)
    {
        startVideo(holder);
    }

    @SuppressLint("NewApi")
    public void startVideo(SurfaceHolder holder)
    {
        String path = "android.resource://" + getPackageName() + BG_VIDEO_PATH;
        Uri uri = Uri.parse(path);

        try
        {
            android.view.ViewGroup.LayoutParams lp = mSurface.getLayoutParams();
            mMediaPlayer.setDisplay(holder);
            mMediaPlayer.setDataSource(this, uri);
            mMediaPlayer.setVideoScalingMode(MediaPlayer.VIDEO_SCALING_MODE_SCALE_TO_FIT_WITH_CROPPING);
            mMediaPlayer.setLooping(true);
            mMediaPlayer.setOnPreparedListener(new OnPreparedListener()
            {

                @Override
                public void onPrepared(MediaPlayer mp)
                {
                    mHandler.postDelayed(new Runnable()
                    {

                        @Override
                        public void run()
                        {
                            mMediaPlayer.start();
                        }
                    }, VIDEO_START_HACK_DELAY);

                }
            });
            mMediaPlayer.prepareAsync();
        }
        catch (Exception e)
        {
            Log.e("VID", "Problem starting video bg", e);
        }
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)
    {
        // TODO Auto-generated method stub
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder)
    {
        // TODO Auto-generated method stub

    }

    @Override
    public void onBackPressed()
    {
        mSurface.setVisibility(View.INVISIBLE);
        mMediaPlayer.stop();
        super.onBackPressed();
    }

    @Override
    protected void onDestroy()
    {
        mMediaPlayer.stop();
        mMediaPlayer.release();
        super.onDestroy();
    }
}

布局文件如下：

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

    <SurfaceView 
        android:id="@+id/surface" 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="40dp"
        android:gravity="center"
        android:orientation="vertical" >

        <Button
            android:id="@+id/tour"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
            android:padding="10dp"
            android:text="@string/ma_tour"/>

        <Button
            android:id="@+id/login"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:padding="10dp"
            android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
            android:text="@string/ma_log_in"/>

    </LinearLayout>

</RelativeLayout>

目标sdk设置为22。你可能经历过这样的行为，并能给出一些建议吗？

Answer 1

下面是我如何在我的一个应用程序中做到这一点：

调用public void onPrepared(MediaPlayer mp)时，调整SurfaceView的大小，使其产生裁剪视频的错觉。Log.v(LOG_TAG，"onPrepared called MediaPlayer")；//调整视频大小，使其适合屏幕大小int videoWidth = mInitialVideoPlayer.getVideoWidth()；int videoHeight = mInitialVideoPlayer.getVideoHeight()；float videoProportion = (float) videoWidth / (float) videoHeight；

ViewGroup.LayoutParams lp = mSplashVideoSurfaceView.getLayoutParams()；//我们总是想填满整个视口。因此，我们保留最小的维度，并按比例//缩放其他维度。if (videoWidth < videoHeight) { lp.width = UiUtils.sScreenWidth；lp.height = (int) ((float) UiUtils.sScreenWidth / videoProportion)；} else { lp.width = (int) (videoProportion * (float) UiUtils.sScreenHeight)；如果您的目标接口级别为14级以上，TextureView允许您播放裁剪后的视频lp.height = UiUtils.sScreenHeight；} Log.v(LOG_TAG，“旧视频大小：”+ videoWidth + "，“+ videoHeight)；mSplashVideoSurfaceView.setLayoutParams(lp); (LOG_TAG，“屏幕大小：”+ UiUtils.sScreenWidth + "，“+ UiUtils.sScreenHeight)；Log.v(LOG_TAG，”新视频大小：“+ lp.width + "，”+ lp.height)；log.v