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
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<? 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 >
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Landscape: res/layout-land/activity_videoview.xml
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<? 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 >
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2.创建Activity
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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
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<activity android:name= ".activity.VideoViewActivity"
android:configChanges= "orientation|screenSize|keyboardHidden"
/>
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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