android动态壁纸调用的简单实例

调用后动态壁纸其实是显示在activity的后面，而activity则是透明显示，这样就可以看到下面的动态壁纸，如果activity不是透明的则什么也看不到。

代码中有用到两个接口

iwallpaperservice mservice;

iwallpaperengine mengine;

我们可以看到该目录下面有三个aidl接口，分别是

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();

}

定义壁纸管理和壁纸信息变量

private wallpapermanager mwallpapermanager = null;

private wallpaperinfo mwallpaperinfo = null;

private wallpaperconnection mwallpaperconnection = null;

private intent mwallpaperintent;

初始化这些变量

mwallpapermanager = wallpapermanager.getinstance(this);

mwallpaperinfo = mwallpapermanager.getwallpaperinfo();//如果返回null则说明当前不是动态壁纸

mwallpaperintent = new intent(wallpaperservice.service_interface);

mwallpaperintent.setclassname(mwallpaperinfo.getpackagename(), mwallpaperinfo.getservicename());

绑定动态壁纸服务

bindservice(mintent, this, context.bind_auto_create);

iwallpaperservice mservice;//这里有一个adil接口

在连接监听中试着attach

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的时候发现总是失败，后来发现是权限问题，只有拥有系统权限的apk才可以使用wallpaperservice.service_interface服务，所以问题就变成了怎么获取系统权限。