java - 全屏视频查看而不拉伸(stretch)视频

Question

我想知道是否可以让视频通过 videoview 全屏运行？

我搜索了很多，尝试了很多方法，例如:

1. 在 list 中应用主题:

   android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
   

   但这不会强制视频全屏显示。

2. 在 Activity 本身中应用:

   requestWindowFeature(Window.FEATURE_NO_TITLE);  
   getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,  
       WindowManager.LayoutParams.FLAG_FULLSCREEN);
   

   也不强制视频全屏显示。

强制视频全屏的唯一方法是:

<VideoView android:id="@+id/myvideoview"
    android:layout_width="fill_parent"
    android:layout_alignParentRight="true"
    android:layout_alignParentLeft="true" 
    android:layout_alignParentTop="true" 
    android:layout_alignParentBottom="true" 
    android:layout_height="fill_parent"> 
</VideoView> 

这样会产生全屏视频，但会拉伸(stretch)视频本身(拉长视频)，

我没有将这个不正确的解决方案应用于我的视频 View ，那么有什么方法可以在不拉伸(stretch)视频的情况下做到这一点？

视频类:

public class Video extends Activity {
    private VideoView myvid;

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        myvid = (VideoView) findViewById(R.id.myvideoview);
        myvid.setVideoURI(Uri.parse("android.resource://" + getPackageName() 
            +"/"+R.raw.video_1));
        myvid.setMediaController(new MediaController(this));
        myvid.requestFocus();
        myvid.start();
    }
}

ma​​in.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <VideoView
        android:id="@+id/myvideoview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>

Answer 1

这样你可以自己设置视频的属性。

使用 SurfaceView(让您对 View 有更多控制权)，将其设置为 fill_parent 以匹配整个屏幕

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     
              android:orientation="vertical" 
              android:layout_width="match_parent"
              android:layout_height="fill_parent">

    <SurfaceView
        android:id="@+id/surfaceViewFrame"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_gravity="center" >
    </SurfaceView>
</Linearlayout>

然后在您的 java 代码中获取表面 View 并将您的媒体播放器添加到其中

surfaceViewFrame = (SurfaceView) findViewById(R.id.surfaceViewFrame);
player = new MediaPlayer();
player.setDisplay(holder);

在您的媒体播放器上设置一个 onPreparedListener 并手动计算所需的视频大小，以所需的比例填充屏幕，避免拉伸(stretch)视频!

player.setOnPreparedListener(new OnPreparedListener() {

        @Override
        public void onPrepared(MediaPlayer mp) {
                    // Adjust the size of the video
    // so it fits on the screen
    int videoWidth = player.getVideoWidth();
    int videoHeight = player.getVideoHeight();
    float videoProportion = (float) videoWidth / (float) videoHeight;       
    int screenWidth = getWindowManager().getDefaultDisplay().getWidth();
    int screenHeight = getWindowManager().getDefaultDisplay().getHeight();
    float screenProportion = (float) screenWidth / (float) screenHeight;
    android.view.ViewGroup.LayoutParams lp = surfaceViewFrame.getLayoutParams();

    if (videoProportion > screenProportion) {
        lp.width = screenWidth;
        lp.height = (int) ((float) screenWidth / videoProportion);
    } else {
        lp.width = (int) (videoProportion * (float) screenHeight);
        lp.height = screenHeight;
    }
    surfaceViewFrame.setLayoutParams(lp);

    if (!player.isPlaying()) {
        player.start();         
    }

        }
    });

我根据前段时间关注的视频流教程修改了这个，现在找不到它来引用它，如果有人这样做，请将链接添加到答案中!

希望对你有帮助!

编辑

好的，因此，如果您希望视频占据整个屏幕并且不希望它拉伸(stretch)，那么最终会在两侧出现黑色条纹。在我发布的代码中，我们正在找出更大的视频或手机屏幕，并以最佳方式对其进行调整。

你有我的完整 Activity ，从链接流式传输视频。它是 100% 功能性的。我不能告诉你如何从你自己的设备上播放视频，因为我不知道。我相信您会在文档 here 中找到它。或 here .

public class VideoPlayer extends Activity implements Callback, OnPreparedListener, OnCompletionListener, 
    OnClickListener {   

private SurfaceView surfaceViewFrame;
private static final String TAG = "VideoPlayer";
private SurfaceHolder holder;
private ProgressBar progressBarWait;
private ImageView pause;
private MediaPlayer player; 
private Timer updateTimer;
String video_uri = "http://daily3gp.com/vids/familyguy_has_own_orbit.3gp";  


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


    pause = (ImageView) findViewById(R.id.imageViewPauseIndicator);
    pause.setVisibility(View.GONE);
    if (player != null) {
        if (!player.isPlaying()) {
            pause.setVisibility(View.VISIBLE);
        }
    }


    surfaceViewFrame = (SurfaceView) findViewById(R.id.surfaceViewFrame);
    surfaceViewFrame.setOnClickListener(this);
    surfaceViewFrame.setClickable(false);

    progressBarWait = (ProgressBar) findViewById(R.id.progressBarWait);

    holder = surfaceViewFrame.getHolder();
    holder.addCallback(this);
    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

    player = new MediaPlayer();
    player.setOnPreparedListener(this);
    player.setOnCompletionListener(this);
    player.setScreenOnWhilePlaying(true);
    player.setDisplay(holder);
}

private void playVideo() {
        new Thread(new Runnable() {
            public void run() {
                try {
                    player.setDataSource(video_uri);
                    player.prepare();
                } catch (Exception e) { // I can split the exceptions to get which error i need.
                    showToast("Error while playing video");
                    Log.i(TAG, "Error");
                    e.printStackTrace();
                } 
            }
        }).start();     
}

private void showToast(final String string) {
    runOnUiThread(new Runnable() {
        public void run() {
            Toast.makeText(VideoPlayer.this, string, Toast.LENGTH_LONG).show();
            finish();
        }
    });
}


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

}

public void surfaceCreated(SurfaceHolder holder) {
    playVideo();
}

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

}
//prepare the video
public void onPrepared(MediaPlayer mp) {        
    progressBarWait.setVisibility(View.GONE);

    // Adjust the size of the video
    // so it fits on the screen
    int videoWidth = player.getVideoWidth();
    int videoHeight = player.getVideoHeight();
    float videoProportion = (float) videoWidth / (float) videoHeight;       
    int screenWidth = getWindowManager().getDefaultDisplay().getWidth();
    int screenHeight = getWindowManager().getDefaultDisplay().getHeight();
    float screenProportion = (float) screenWidth / (float) screenHeight;
    android.view.ViewGroup.LayoutParams lp = surfaceViewFrame.getLayoutParams();

    if (videoProportion > screenProportion) {
        lp.width = screenWidth;
        lp.height = (int) ((float) screenWidth / videoProportion);
    } else {
        lp.width = (int) (videoProportion * (float) screenHeight);
        lp.height = screenHeight;
    }
    surfaceViewFrame.setLayoutParams(lp);

    if (!player.isPlaying()) {
        player.start();         
    }
    surfaceViewFrame.setClickable(true);
}

// callback when the video is over
public void onCompletion(MediaPlayer mp) {
    mp.stop();
    if (updateTimer != null) {
        updateTimer.cancel();
    }
    finish();
}

//pause and resume
public void onClick(View v) {
    if (v.getId() == R.id.surfaceViewFrame) {
         if (player != null) {
            if (player.isPlaying()) {
                player.pause();
                pause.setVisibility(View.VISIBLE);
            } else {
                player.start();
                pause.setVisibility(View.GONE);
            }
        }
    }
}

}