安装apk

public void installApk(String filename) {
	File file = new File(filename);
	Intent intent = new Intent();
	intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
	intent.setAction(Intent.ACTION_VIEW);
	String type = "application/vnd.android.package-archive";
	intent.setDataAndType(Uri.fromFile(file), type);
	startActivity(intent);
}