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一个Activity主要用来做播放视频使用，并且是全屏播放的话，主要采用横屏（Landscape orientation 显示宽度大于高度）显示视频，那么可以指定Activity的属性android:screenOrientation="landscape"让Activity在设备上以横屏显示。
本文使用VideoView来显示视屏，Potrait(竖屏)时布局样式中宽匹配父布局，高匹配内容；Landscape(横屏)时布局样式中宽匹配内容，高匹配布局。视屏播放中，用户调正设备方向时，导致屏幕方向发生变化，视屏能够适应布局样式显示视频，并正常继续播放。
示例图：
1. 构建布局
Potrait: res/layout/activity_videoview.xml
| 1 2 3 4 5 6 7 8 9 10 11 | <? xml version = "1.0" encoding = "utf-8" ?> < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" android:layout_width = "match_parent" android:layout_height = "match_parent" android:orientation = "vertical" > < VideoView android:id = "@+id/videoView" android:layout_width = "match_parent" android:layout_height = "wrap_content" android:layout_gravity = "center_horizontal" android:layout_margin = "5dp" /> </ LinearLayout > |
Landscape: res/layout-land/activity_videoview.xml
| 1 2 3 4 5 6 7 8 9 10 | <? xml version = "1.0" encoding = "utf-8" ?> < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android" android:orientation = "vertical" android:layout_width = "match_parent" android:layout_height = "match_parent" > < VideoView android:layout_width = "wrap_content" android:layout_height = "match_parent" android:id = "@+id/videoView" android:layout_gravity = "center_horizontal" android:layout_margin = "5dp" /> </ LinearLayout > |
2.创建Activity
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 | package secondriver.sdk.activity; import android.app.Activity; import android.app.ProgressDialog; import android.content.res.Configuration; import android.media.MediaPlayer; import android.net.Uri; import android.os.Bundle; import android.util.Log; import android.widget.MediaController; import android.widget.Toast; import android.widget.VideoView; import secondriver.sdk.R; /** * Author : secondriver * Created : 2015/11/30 */ public class VideoViewActivity extends Activity implements MediaPlayer.OnPreparedListener, MediaPlayer.OnCompletionListener, MediaPlayer.OnErrorListener { private final String TAG = VideoViewActivity. class .getName(); public VideoView videoView; public MediaController mediaController; public int videoPosition = 0 ; public ProgressDialog dialog; @Override protected void onCreate(Bundle savedInstanceState) { Log.d(TAG, "onCreate" ); super .onCreate(savedInstanceState); setContentView(R.layout.activity_videoview); dialog = new ProgressDialog( this ); dialog.setTitle( "视屏播放器" ); dialog.setMessage( "正在加载..." ); dialog.setCancelable( false ); mediaController = new MediaController( this ); videoView = (VideoView) findViewById(R.id.videoView); videoView.setMediaController(mediaController); videoView.setOnCompletionListener( this ); videoView.setOnPreparedListener( this ); videoView.setOnErrorListener( this ); } private void loadVideo() { Log.d(TAG, "load video" ); dialog.show(); try { videoView.setVideoURI(Uri.parse( "android.resource://" + getPackageName() + "/" + R.raw.bsg)); } catch (Exception e) { Log.e(TAG, e.getMessage()); } } @Override protected void onStart() { Log.d(TAG, "onStart" ); super .onStart(); loadVideo(); } @Override public void onConfigurationChanged(Configuration newConfig) { Log.d(TAG, "onConfigurationChanged" ); super .onConfigurationChanged(newConfig); } @Override public void onCompletion(MediaPlayer mp) { Log.d(TAG, "Media onCompletion" ); Toast.makeText(VideoViewActivity. this , "播放完成" , Toast.LENGTH_LONG).show(); mp.release(); } @Override public void onPrepared(MediaPlayer mp) { Log.d(TAG, "Media onPrepared" ); if (dialog.isShowing()) { dialog.dismiss(); } mp.seekTo(videoPosition); if (videoPosition == 0 ) { mp.start(); } else { mp.pause(); } } @Override public boolean onError(MediaPlayer mp, int what, int extra) { Log.d(TAG, "Media onError" ); String err = "未知错误" ; switch (what) { case MediaPlayer.MEDIA_ERROR_UNKNOWN: break ; case MediaPlayer.MEDIA_ERROR_SERVER_DIED: err = "媒体服务终止" ; break ; default : break ; } Toast.makeText(VideoViewActivity. this , err, Toast.LENGTH_LONG).show(); return true ; } } |
3. 设置Activity属性
| 1 2 3 | <activity android:name= ".activity.VideoViewActivity" android:configChanges= "orientation|screenSize|keyboardHidden" /> |
代码中重写了onConfigurationChanged,可以在此处做配置发生变化的处理。
在运行时发生配置更改，Activity被关闭，默认情况下重新启动，但在设置了Activity的configChanges属性的配置将防止活动被重新启动，Activity仍在运行并且onConfigurationChanged方法被调用。
需要注意的是如果应用程序的target API level是13+的话(声明了minSdkversion和targetSdkVersion属性)，需要同时设置screensize, 因为设备的横竖方向发生变化的时候，当前屏幕的可用尺寸也将发生变化。
本文转自 secondriver 51CTO博客，原文链接：http://blog.51cto.com/aiilive/1718653，如需转载请自行联系原作者