Wie passt man Videos in das Live-Hintergrundbild ein, indem man sie in der Mitte zuschneidet und an Breite / Höhe anpasst?

Sie können dies mit einer TextureView erreichen. (SurfaceView wird auch nicht funktionieren.) Ich habe einen Code gefunden, der Ihnen dabei helfen wird, dies zu erreichen.
In dieser Demo können Sie das Video in drei Arten in der Mitte, oben und unten zuschneiden.

TextureVideoView.Java

public class TextureVideoView extends TextureView implements TextureView.SurfaceTextureListener {

    // Indicate if logging is on
    public static final boolean LOG_ON = true;

    // Log tag
    private static final String TAG = TextureVideoView.class.getName();

    private MediaPlayer mMediaPlayer;

    private float mVideoHeight;
    private float mVideoWidth;

    private boolean mIsDataSourceSet;
    private boolean mIsViewAvailable;
    private boolean mIsVideoPrepared;
    private boolean mIsPlayCalled;

    private ScaleType mScaleType;
    private State mState;

    public enum ScaleType {
        CENTER_CROP, TOP, BOTTOM
    }

    public enum State {
        UNINITIALIZED, PLAY, STOP, PAUSE, END
    }

    public TextureVideoView(Context context) {
        super(context);
        initView();
    }

    public TextureVideoView(Context context, AttributeSet attrs) {
        super(context, attrs);
        initView();
    }

    public TextureVideoView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        initView();
    }

    private void initView() {
        initPlayer();
        setScaleType(ScaleType.CENTER_CROP);
        setSurfaceTextureListener(this);
    }

    public void setScaleType(ScaleType scaleType) {
        mScaleType = scaleType;
    }

    private void updateTextureViewSize() {
        float viewWidth = getWidth();
        float viewHeight = getHeight();

        float scaleX = 1.0f;
        float scaleY = 1.0f;

        if (mVideoWidth > viewWidth && mVideoHeight > viewHeight) {
            scaleX = mVideoWidth / viewWidth;
            scaleY = mVideoHeight / viewHeight;
        } else if (mVideoWidth < viewWidth && mVideoHeight < viewHeight) {
            scaleY = viewWidth / mVideoWidth;
            scaleX = viewHeight / mVideoHeight;
        } else if (viewWidth > mVideoWidth) {
            scaleY = (viewWidth / mVideoWidth) / (viewHeight / mVideoHeight);
        } else if (viewHeight > mVideoHeight) {
            scaleX = (viewHeight / mVideoHeight) / (viewWidth / mVideoWidth);
        }

        // Calculate pivot points, in our case crop from center
        int pivotPointX;
        int pivotPointY;

        switch (mScaleType) {
            case TOP:
                pivotPointX = 0;
                pivotPointY = 0;
                break;
            case BOTTOM:
                pivotPointX = (int) (viewWidth);
                pivotPointY = (int) (viewHeight);
                break;
            case CENTER_CROP:
                pivotPointX = (int) (viewWidth / 2);
                pivotPointY = (int) (viewHeight / 2);
                break;
            default:
                pivotPointX = (int) (viewWidth / 2);
                pivotPointY = (int) (viewHeight / 2);
                break;
        }

        Matrix matrix = new Matrix();
        matrix.setScale(scaleX, scaleY, pivotPointX, pivotPointY);

        setTransform(matrix);
    }

    private void initPlayer() {
        if (mMediaPlayer == null) {
            mMediaPlayer = new MediaPlayer();
        } else {
            mMediaPlayer.reset();
        }
        mIsVideoPrepared = false;
        mIsPlayCalled = false;
        mState = State.UNINITIALIZED;
    }

    /**
     * @see MediaPlayer#setDataSource(String)
     */
    public void setDataSource(String path) {
        initPlayer();

        try {
            mMediaPlayer.setDataSource(path);
            mIsDataSourceSet = true;
            prepare();
        } catch (IOException e) {
            Log.d(TAG, e.getMessage());
        }
    }

    /**
     * @see MediaPlayer#setDataSource(Context, Uri)
     */
    public void setDataSource(Context context, Uri uri) {
        initPlayer();

        try {
            mMediaPlayer.setDataSource(context, uri);
            mIsDataSourceSet = true;
            prepare();
        } catch (IOException e) {
            Log.d(TAG, e.getMessage());
        }
    }

    /**
     * @see MediaPlayer#setDataSource(Java.io.FileDescriptor)
     */
    public void setDataSource(AssetFileDescriptor afd) {
        initPlayer();

        try {
            long startOffset = afd.getStartOffset();
            long length = afd.getLength();
            mMediaPlayer.setDataSource(afd.getFileDescriptor(), startOffset, length);
            mIsDataSourceSet = true;
            prepare();
        } catch (IOException e) {
            Log.d(TAG, e.getMessage());
        }
    }

    private void prepare() {
        try {
            mMediaPlayer.setOnVideoSizeChangedListener(
                    new MediaPlayer.OnVideoSizeChangedListener() {
                        @Override
                        public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
                            mVideoWidth = width;
                            mVideoHeight = height;
                            updateTextureViewSize();
                        }
                    }
            );
            mMediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                @Override
                public void onCompletion(MediaPlayer mp) {
                    mState = State.END;
                    log("Video has ended.");

                    if (mListener != null) {
                        mListener.onVideoEnd();
                    }
                }
            });

            // don't forget to call MediaPlayer.prepareAsync() method when you use constructor for
            // creating MediaPlayer
            mMediaPlayer.prepareAsync();

            // Play video when the media source is ready for playback.
            mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mediaPlayer) {
                    mIsVideoPrepared = true;
                    if (mIsPlayCalled && mIsViewAvailable) {
                        log("Player is prepared and play() was called.");
                        play();
                    }

                    if (mListener != null) {
                        mListener.onVideoPrepared();
                    }
                }
            });

        } catch (IllegalArgumentException e) {
            Log.d(TAG, e.getMessage());
        } catch (SecurityException e) {
            Log.d(TAG, e.getMessage());
        } catch (IllegalStateException e) {
            Log.d(TAG, e.toString());
        }
    }

    /**
     * Play or resume video. Video will be played as soon as view is available and media player is
     * prepared.
     *
     * If video is stopped or ended and play() method was called, video will start over.
     */
    public void play() {
        if (!mIsDataSourceSet) {
            log("play() was called but data source was not set.");
            return;
        }

        mIsPlayCalled = true;

        if (!mIsVideoPrepared) {
            log("play() was called but video is not prepared yet, waiting.");
            return;
        }

        if (!mIsViewAvailable) {
            log("play() was called but view is not available yet, waiting.");
            return;
        }

        if (mState == State.PLAY) {
            log("play() was called but video is already playing.");
            return;
        }

        if (mState == State.PAUSE) {
            log("play() was called but video is paused, resuming.");
            mState = State.PLAY;
            mMediaPlayer.start();
            return;
        }

        if (mState == State.END || mState == State.STOP) {
            log("play() was called but video already ended, starting over.");
            mState = State.PLAY;
            mMediaPlayer.seekTo(0);
            mMediaPlayer.start();
            return;
        }

        mState = State.PLAY;
        mMediaPlayer.start();
    }

    /**
     * Pause video. If video is already paused, stopped or ended nothing will happen.
     */
    public void pause() {
        if (mState == State.PAUSE) {
            log("pause() was called but video already paused.");
            return;
        }

        if (mState == State.STOP) {
            log("pause() was called but video already stopped.");
            return;
        }

        if (mState == State.END) {
            log("pause() was called but video already ended.");
            return;
        }

        mState = State.PAUSE;
        if (mMediaPlayer.isPlaying()) {
            mMediaPlayer.pause();
        }
    }

    /**
     * Stop video (pause and seek to beginning). If video is already stopped or ended nothing will
     * happen.
     */
    public void stop() {
        if (mState == State.STOP) {
            log("stop() was called but video already stopped.");
            return;
        }

        if (mState == State.END) {
            log("stop() was called but video already ended.");
            return;
        }

        mState = State.STOP;
        if (mMediaPlayer.isPlaying()) {
            mMediaPlayer.pause();
            mMediaPlayer.seekTo(0);
        }
    }

    /**
     * @see MediaPlayer#setLooping(boolean)
     */
    public void setLooping(boolean looping) {
        mMediaPlayer.setLooping(looping);
    }

    /**
     * @see MediaPlayer#seekTo(int)
     */
    public void seekTo(int milliseconds) {
        mMediaPlayer.seekTo(milliseconds);
    }

    /**
     * @see MediaPlayer#getDuration()
     */
    public int getDuration() {
        return mMediaPlayer.getDuration();
    }

    static void log(String message) {
        if (LOG_ON) {
            Log.d(TAG, message);
        }
    }

    private MediaPlayerListener mListener;

    /**
     * Listener trigger 'onVideoPrepared' and `onVideoEnd` events
     */
    public void setListener(MediaPlayerListener listener) {
        mListener = listener;
    }

    public interface MediaPlayerListener {

        public void onVideoPrepared();

        public void onVideoEnd();
    }

    @Override
    public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width, int height) {
        Surface surface = new Surface(surfaceTexture);
        mMediaPlayer.setSurface(surface);
        mIsViewAvailable = true;
        if (mIsDataSourceSet && mIsPlayCalled && mIsVideoPrepared) {
            log("View is available and play() was called.");
            play();
        }
    }

    @Override
    public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {

    }

    @Override
    public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
        return false;
    }

    @Override
    public void onSurfaceTextureUpdated(SurfaceTexture surface) {

    }
}

Verwenden Sie danach diese Klasse wie den folgenden Code in MainActivity.Java

public class MainActivity extends AppCompatActivity implements View.OnClickListener,
        ActionBar.OnNavigationListener {

    // Video file url
    private static final String FILE_URL = "http://techslides.com/demos/sample-videos/small.mp4";
    private TextureVideoView mTextureVideoView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();
        initActionBar();

        if (!isWIFIOn(getBaseContext())) {
            Toast.makeText(getBaseContext(), "You need internet connection to stream video",
                    Toast.LENGTH_LONG).show();
        }
    }

    private void initActionBar() {
        ActionBar actionBar = getSupportActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
        actionBar.setDisplayShowTitleEnabled(false);

        SpinnerAdapter mSpinnerAdapter = ArrayAdapter.createFromResource(this, R.array.action_list,
                Android.R.layout.simple_spinner_dropdown_item);
        actionBar.setListNavigationCallbacks(mSpinnerAdapter, this);
    }

    private void initView() {
        mTextureVideoView = (TextureVideoView) findViewById(R.id.cropTextureView);

        findViewById(R.id.btnPlay).setOnClickListener(this);
        findViewById(R.id.btnPause).setOnClickListener(this);
        findViewById(R.id.btnStop).setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btnPlay:
                mTextureVideoView.play();
                break;
            case R.id.btnPause:
                mTextureVideoView.pause();
                break;
            case R.id.btnStop:
                mTextureVideoView.stop();
                break;
        }
    }

    final int indexCropCenter = 0;
    final int indexCropTop = 1;
    final int indexCropBottom = 2;

    @Override
    public boolean onNavigationItemSelected(int itemPosition, long itemId) {
        switch (itemPosition) {
            case indexCropCenter:
                mTextureVideoView.stop();
                mTextureVideoView.setScaleType(TextureVideoView.ScaleType.CENTER_CROP);
                mTextureVideoView.setDataSource(FILE_URL);
                mTextureVideoView.play();
                break;
            case indexCropTop:
                mTextureVideoView.stop();
                mTextureVideoView.setScaleType(TextureVideoView.ScaleType.TOP);
                mTextureVideoView.setDataSource(FILE_URL);
                mTextureVideoView.play();
                break;
            case indexCropBottom:
                mTextureVideoView.stop();
                mTextureVideoView.setScaleType(TextureVideoView.ScaleType.BOTTOM);
                mTextureVideoView.setDataSource(FILE_URL);
                mTextureVideoView.play();
                break;
        }
        return true;
    }

    public static boolean isWIFIOn(Context context) {
        ConnectivityManager connMgr =
                (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connMgr.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

        return (networkInfo != null && networkInfo.isConnected());
    }
}

und Layout activity_main.xml Datei dafür ist unten

<RelativeLayout xmlns:Android="http://schemas.Android.com/apk/res/Android"
    Android:layout_width="fill_parent"
    Android:layout_height="fill_parent">

    <com.example.videocropdemo.crop.TextureVideoView
        Android:id="@+id/cropTextureView"
        Android:layout_width="fill_parent"
        Android:layout_height="fill_parent"
        Android:layout_centerInParent="true" />

    <LinearLayout
        Android:layout_width="match_parent"
        Android:layout_height="wrap_content"
        Android:layout_alignParentBottom="true"
        Android:layout_margin="16dp"
        Android:orientation="horizontal">

        <Button
            Android:id="@+id/btnPlay"
            Android:layout_width="wrap_content"
            Android:layout_height="wrap_content"
            Android:text="Play" />

        <Button
            Android:id="@+id/btnPause"
            Android:layout_width="wrap_content"
            Android:layout_height="wrap_content"
            Android:text="Pause" />

        <Button
            Android:id="@+id/btnStop"
            Android:layout_width="wrap_content"
            Android:layout_height="wrap_content"
            Android:text="Stop" />
    </LinearLayout>
</RelativeLayout>

Die Ausgabe des Codes für den Mittelschnitt sieht so aus