静默安装apk

Uri packageUri = Uri.fromFile(file);//file是要安装的apk文件 

PackageManager pm = ((Activity)mContext).getPackageManager();  

installFlags |= PackageManager.INSTALL_REPLACE_EXISTING;  

PackageInstallObserver observer = new PackageInstallObserver();  

pm.installPackage(packageUri, observer, installFlags, info.intent.getComponent().getPackageName());  

LOCAL_CERTIFICATE := platform

<uses-permission android:name="android.permission.INSTALL_PACKAGES" />