安装APK

public static void installApk(Context context, File file) {
   Intent intent = new Intent();
   intent.setAction( "android.intent.action.VIEW" );
   intent.addCategory( "android.intent.category.DEFAULT" );
   intent.setType( "application/vnd.android.package-archive" );
   intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive" );
   intent.setFlags(Intent.FLAG\_ACTIVITY\_NEW_TASK);
   context.startActivity(intent);
}