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作者:7_px
链接:https://www.jianshu.com/p/fc5cf284abbb
声明:本文已获7_px
授权发表,转发等请联系原作者授权
一、概述:
壁纸运行在一个Android服务之中,这个服务的名字叫做WallpaperService。当用户选择了一个壁纸之后,此壁纸所对应的WallpaperService便会启动并开始进行壁纸的绘制工作。
Engine是WallpaperService中的一个内部类,实现了壁纸窗口的创建以及Surface的维护工作。Engine内部实现了SurfaceView,我们只需要在其内部利用MediaPlayer + SurfaceView就可以播放动态壁纸了。
二、实现:
WallpaperService需要一个xml去配置,然后在AndroidManifest.xml中声明
<wallpaper xmlns:android="http://schemas.android.com/apk/res/android"android:thumbnail="@mipmap/icon_lacation_black___cm">
wallpaper>
继承WallpaperService实现我们自己的壁纸服务VideoLiveWallpaper
public class VideoLiveWallpaper extends WallpaperService {
@Override
public Engine onCreateEngine() {
return new VideoEngine();
}
class VideoEngine extends Engine {
private MediaPlayer mMediaPlayer;
@Override
public void onCreate(SurfaceHolder surfaceHolder) {
super.onCreate(surfaceHolder);
}
@Override
public void onDestroy() {
super.onDestroy();
}
@Override
public void onSurfaceCreated(SurfaceHolder holder) {
super.onSurfaceCreated(holder);
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setSurface(holder.getSurface());
try {
mMediaPlayer.setDataSource(new File(FileUtil.getDCIMCameraDir(), "hlj_wallpaper").getAbsolutePath());
mMediaPlayer.setLooping(true);
mMediaPlayer.setVolume(0, 0);
mMediaPlayer.prepare();
mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mMediaPlayer.start();
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void onSurfaceDestroyed(SurfaceHolder holder) {
super.onSurfaceDestroyed(holder);
mMediaPlayer.release();
mMediaPlayer = null;
}
@Override
public void onVisibilityChanged(boolean visible) {
if (visible) {
mMediaPlayer.start();
} else {
mMediaPlayer.pause();
}
}
}
}
接着声明这个服务同时声明我们上面写的xml配置
<serviceandroid:name=".VideoLiveWallpaper"android:label="@string/app_name"android:permission="android.permission.BIND_WALLPAPER"android:process=":wallpaper">
<intent-filter>
<action android:name="android.service.wallpaper.WallpaperService" />
intent-filter>
<meta-dataandroid:name="android.service.wallpaper"android:resource="@xml/wallpaper" />
service>
重点在onSurfaceCreated方法中,这里为了可以动态切换不同的壁纸,我是指定去加载一个固定目录下的视频文件,然后不断的复制新文件到这个目录,因为一旦开启切换壁纸这个方法就会调用,所以当调用后再动态通知去更改路径不起作用。
所以我在更换壁纸前先清空
try {
WallpaperManager.getInstance(getContext())
.clear();
} catch (IOException e) {
e.printStackTrace();
}
再去复制需要替换的壁纸到指定目录
copyFile(file.getAbsolutePath(),
new File(FileUtil.getDCIMCameraDir(),
"hlj_wallpaper").getAbsolutePath());
/**
* 复制单个文件
*
* @param oldPath String 原文件路径 如:c:/fqf.txt
* @param newPath String 复制后路径 如:f:/fqf.txt
* @return boolean
*/
public void copyFile(final String oldPath, final String newPath) {
progressBar.setVisibility(View.VISIBLE);
Observable.create(new Observable.OnSubscribe() {@Overridepublic void call(Subscriber super Boolean> subscriber) {try {int byteSum = 0;int byteRead ;
File oldFile = new File(oldPath);if (oldFile.exists()) { //文件存在时
InputStream inStream = new FileInputStream(oldPath); //读入原文件
FileOutputStream fs = new FileOutputStream(newPath);byte[] buffer = new byte[1444];while ((byteRead = inStream.read(buffer)) != -1) {
byteSum += byteRead; //字节数 文件大小
System.out.println(byteSum);
fs.write(buffer, 0, byteRead);
}
inStream.close();
subscriber.onNext(true);
subscriber.onCompleted();
}
} catch (Exception e) {
System.out.println("复制单个文件操作出错");
e.printStackTrace();
subscriber.onCompleted();
}
}
})
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer() {@Overridepublic void onCompleted() {
progressBar.setVisibility(View.GONE);
}@Overridepublic void onError(Throwable e) {
progressBar.setVisibility(View.GONE);
}@Overridepublic void onNext(Boolean aBoolean) {
progressBar.setVisibility(View.GONE);
setToWallPaper(getContext());
}
});
}
setToWallPaper 方法就是真正的开启设置壁纸操作了
public static void setToWallPaper(Context context) {
final Intent intent = new Intent(WallpaperManager.ACTION_CHANGE_LIVE_WALLPAPER);
intent.putExtra(WallpaperManager.EXTRA_LIVE_WALLPAPER_COMPONENT,
new ComponentName(context, VideoLiveWallpaper.class));
context.startActivity(intent);
}
至此,一个简单的动态壁纸就搞定了。
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