調用後動態壁紙其實是顯示在Activity的後面,而Activity則是透明顯示,這樣就可以看到下面的動態壁紙,如果Activity不是透明的則什麼也看不到。
代碼中有用到兩個介面
IWallpaperService mService;
IWallpaperEngine mEngine;
我們可以看到該目錄下面有三個aidl介面,分別是
複製代碼 代碼如下:interface IWallpaperConnection {
void attachEngine(IWallpaperEngine engine);
ParcelFileDescriptor setWallpaper(String name);
}
oneway interface IWallpaperService {
void attach(IWallpaperConnection connection,
IBinder windowToken, int windowType, boolean isPreview,
int reqWidth, int reqHeight);
}
oneway interface IWallpaperEngine {
void setDesiredSize(int width, int height);
void setVisibility(boolean visible);
void dispatchPointer(in MotionEvent event);
void dispatchWallpaperCommand(String action, int x, int y, int z, in Bundle extras);
void destroy();
}
定義壁紙管理和壁紙資訊變數
複製代碼 代碼如下:private WallpaperManager mWallpaperManager = null;
private WallpaperInfo mWallpaperInfo = null;
private WallpaperConnection mWallpaperConnection = null;
private Intent mWallpaperIntent;
初始化這些變數
複製代碼 代碼如下:mWallpaperManager = WallpaperManager.getInstance(this);
mWallpaperInfo = mWallpaperManager.getWallpaperInfo();//如果返回null則說明當前不是動態壁紙
mWallpaperIntent = new Intent(WallpaperService.SERVICE_INTERFACE);
mWallpaperIntent.setClassName(mWallpaperInfo.getPackageName(), mWallpaperInfo.getServiceName());
綁定動態壁紙服務
複製代碼 代碼如下:bindService(mIntent, this, Context.BIND_AUTO_CREATE);
IWallpaperService mService;//這裡有一個adil介面
在串連監聽中試著attach
複製代碼 代碼如下:public void onServiceConnected(ComponentName name, IBinder service) {
mService = IWallpaperService.Stub.asInterface(service);
try {
mService.attach(this, view.getWindowToken(),
// WindowManager.LayoutParams.TYPE_APPLICATION_MEDIA_OVERLAY,
WindowManager.LayoutParams.TYPE_APPLICATION_MEDIA,
true, root.getWidth(), root.getHeight());
} catch (RemoteException e) {
Log.w("", "Failed attaching wallpaper; clearing", e);
}
}
在bindService的時候發現總是失敗,後來發現是許可權問題,只有擁有系統許可權的apk才可以使用WallpaperService.SERVICE_INTERFACE服務,所以問題就變成了怎麼擷取系統許可權。