問題緣由:
最近准備封裝一個視頻播放器,我采用了SurfaceView + MediaPlayer的方式。
視頻加載顯示畫面后遇到問題:“視頻畫面扭曲,比例變形。”
問題截圖:
解決思路:
視頻尺寸會自動填充surfaceView,所以想要調整視頻尺寸 修改surfaceView就好了。
通過監聽mediaplayer的回調函數“onVideoSizeChanged” 在里面修改surfaceView的寬高。
changeVideoSize
public void changeVideoSize() { int videoWidth = mediaPlayer.getVideoWidth(); int videoHeight = mediaPlayer.getVideoHeight(); //根據視頻尺寸去計算->視頻可以在sufaceView中放大的最大倍數。 float max; if (getResources().getConfiguration().orientation==ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) { //豎屏模式下按視頻寬度計算放大倍數值 max = Math.max((float) videoWidth / (float) surfaceWidth,(float) videoHeight / (float) surfaceHeight); } else{ //橫屏模式下按視頻高度計算放大倍數值 max = Math.max(((float) videoWidth/(float) surfaceHeight),(float) videoHeight/(float) surfaceWidth); } //視頻寬高分別/最大倍數值 計算出放大后的視頻尺寸 videoWidth = (int) Math.ceil((float) videoWidth / max); videoHeight = (int) Math.ceil((float) videoHeight / max); //無法直接設置視頻尺寸,將計算出的視頻尺寸設置到surfaceView 讓視頻自動填充。 surfaceView.setLayoutParams(new RelativeLayout.LayoutParams(videoWidth, videoHeight)); }
注意:surfaceView的尺寸需要記錄保存為固定值,否則在屏幕旋轉后尺寸會變動。
效果截圖:
完整代碼:
public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback, MediaPlayer.OnVideoSizeChangedListener { private SurfaceView surfaceView; private MediaPlayer mediaPlayer; private int surfaceWidth; private int surfaceHeight; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //初始化頁面/對象/變量/監聽事件 setContentView(R.layout.activity_main); surfaceView = (SurfaceView) findViewById(R.id.surfaceView); surfaceView.getHolder().addCallback(this); } private void playVideo(String url) { try { mediaPlayer.setDataSource(this, Uri.parse(url)); mediaPlayer.prepare(); mediaPlayer.start();} catch (IOException e) {e.printStackTrace();} } @Override public void surfaceCreated(SurfaceHolder surfaceHolder) { mediaPlayer = new MediaPlayer(); mediaPlayer.setOnVideoSizeChangedListener(this); mediaPlayer.setDisplay(surfaceHolder);
if(getResources().getConfiguration().orientation==ActivityInfo.SCREEN_ORIENTATION_PORTRAIT){ surfaceWidth=surfaceView.getWidth(); surfaceHeight=surfaceView.getHeight(); }else { surfaceWidth=surfaceView.getHeight(); surfaceHeight=surfaceView.getWidth(); } playVideo("http://pgccdn.v.baidu.com/258500786_2854944371_20171201122626.mp4?authorization=bce-auth-v1%2Fc308a72e7b874edd9115e4614e1d62f6%2F2017-12-01T04%3A26%3A31Z%2F-1%2F%2Fcbe73c8f603a65a23a019236ad32c090ba08f587acae4011d388f153d912724f&responseCacheControl=max-age%3D8640000&responseExpires=Sun%2C+11+Mar+2018+12%3A26%3A31+GMT&xcode=0d70b526aeacd2423ca650defc16c18d96d564747874148f&time=1512191597&_=1512108201312"); } @Override public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) { } @Override public void surfaceDestroyed(SurfaceHolder surfaceHolder) { mediaPlayer.release(); mediaPlayer=null; } public void changeVideoSize() { int videoWidth = mediaPlayer.getVideoWidth(); int videoHeight = mediaPlayer.getVideoHeight(); //根據視頻尺寸去計算->視頻可以在sufaceView中放大的最大倍數。 float max; if (getResources().getConfiguration().orientation==ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) { //豎屏模式下按視頻寬度計算放大倍數值 max = Math.max((float) videoWidth / (float) surfaceWidth,(float) videoHeight / (float) surfaceHeight); } else{ //橫屏模式下按視頻高度計算放大倍數值 max = Math.max(((float) videoWidth/(float) surfaceHeight),(float) videoHeight/(float) surfaceWidth); } //視頻寬高分別/最大倍數值 計算出放大后的視頻尺寸 videoWidth = (int) Math.ceil((float) videoWidth / max); videoHeight = (int) Math.ceil((float) videoHeight / max); //無法直接設置視頻尺寸,將計算出的視頻尺寸設置到surfaceView 讓視頻自動填充。 surfaceView.setLayoutParams(new RelativeLayout.LayoutParams(videoWidth, videoHeight)); } @Override public void onVideoSizeChanged(MediaPlayer mp, int width, int height) { changeVideoSize(); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); changeVideoSize(); } }
最后,在此希望大家能夠提供其它算法,應該會有更好的。
補充(2017-12-02):
一個最簡單的解決方案(此方法僅用於surfaceView居中,不能適配視頻比列):
@Override public void onVideoSizeChanged(MediaPlayer mp, int width, int height) { surfaceView.setLayoutParams(new RelativeLayout.LayoutParams(width,height)); }
<RelativeLayout android:layout_width="match_parent" android:layout_height="250dp" android:gravity="center" android:background="#000"> <SurfaceView android:id="@+id/surfaceView" android:layout_width="match_parent" android:layout_height="match_parent" /> </RelativeLayout>
在視頻大小確定的回調函數中調整surfaceView尺寸,再通過layout嵌套surfaceView讓其居中顯示。
建議外層套RelativeLayout,用LinearLayout居中,畫面顯示不完整,這里可以自行測試。