android：程序中安装APK方法

File f = new File("sdcard/fallingball.apk");

Intent intent = new Intent();

intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

intent.setAction(android.content.Intent.ACTION_VIEW);

/* 设置intent的file与MimeType */

intent.setDataAndType(Uri.fromFile(f),

"application/vnd.android.package-archive");

startActivity(intent);