Intent intent = new Intent(Intent.ACTION_VIEW);  intent.setDataAndType(Uri.fromFile(new File("/sdcard/Test.apk")),    "application/vnd.android.package-archive");  startActivity(intent); // 安裝 程序

  Uri packageURI = Uri.parse("package:com.ygc.Test");  Intent uninstallIntent = new Intent(Intent.ACTION_DELETE, packageURI);  startActivity(uninstallIntent);// 正常卸載程序