嗨,我正在尝试使用视频文件制作背景活动.下面发布的解决方案适用于大多数设备,但nexus 6
Android 5.1除外.视频正在运行,缩放但未裁剪,因此不保留纵横比.
使用Galaxy Note,HTC One m7,Xperia Z3,Nexus 5进行测试.
这是代码:
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(); } }
这是布局文件:
<?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.
您是否经历过这样的行为并且可以提出任何建议?
解决方法
以下是我在其中一个应用程序中执行此操作的方法:
>在MediaPlayer对象上设置OnPreparedListener.
mediaPlayer.setOnPreparedListener(本);
>当调用publicPrepared(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调用MediaPlayer”);
//调整视频大小,使其适合屏幕
int videoWidth = mInitialVideoPlayer.getVideoWidth();
int videoHeight = mInitialVideoPlayer.getVideoHeight();
float videoProportion =(float)videoWidth /(float)videoHeight;
ViewGroup.LayoutParams lp = mSplashVideoSurfaceView.getLayoutParams(); // We always want to fill entire view port. So,we keep the smallest dimension and proportionately // scale the other dimension. if (videoWidth < videoHeight) { lp.width = UiUtils.sScreenWidth; lp.height = (int) ((float) UiUtils.sScreenWidth / videoProportion); } else { lp.width = (int) (videoProportion * (float) UiUtils.sScreenHeight);If you are targetting API level 14 and above,<code>TextureView</code> allows you to play cropped video lp.height = UiUtils.sScreenHeight; } Log.v(LOG_TAG,"old video size: " + videoWidth + "," + videoHeight); Log.v(LOG_TAG,"screen size: " + UiUtils.sScreenWidth + "," + UiUtils.sScreenHeight); Log.v(LOG_TAG,"new video size: " + lp.width + "," + lp.height); mSplashVideoSurfaceView.setLayoutParams(lp);