安裝 APK 檔

Uri uri = Uri.parse("url_of_apk_file");

Intent it = new Intent(Intent.ACTION_VIEW, uri);

it.setData(uri);

it.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

it.setClassName("com.android.packageinstaller", "com.android.packageinstaller.PackageInstallerActivity");

startActivity(it);