[Android学习笔记八] 使用VideoView屏幕方向发生变化，视频方向自动切换
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
;
}
}
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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
