啟動其他程式

private void startApp(String packname) {
  // 只能把使用者自己安裝的程式的intent擷取出來 啟動
  // 很多系統的app 找不到 lunchintent
  // Intent intent =
  // getPackageManager().getLaunchIntentForPackage(packname);
  // intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  // startActivity(intent);
  try {
   PackageInfo info = getPackageManager().getPackageInfo(packname,
     PackageManager.GET_ACTIVITIES);
   ActivityInfo[] activityinfos = info.activities;
   ActivityInfo activityinfo = activityinfos[0];
   if (activityinfo != null) {
    String classname = activityinfo.name;
    Log.i(TAG, "classname " + classname);
    Intent intent = new Intent();
    intent.setClassName(packname, classname);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(intent);
   } else {
    Toast.makeText(this, "無法啟動該應用", 1).show();
   }

  } catch (Exception e) {

   e.printStackTrace();
   if (e instanceof ActivityNotFoundException) {
    Toast.makeText(this, "無法啟動該應用", 1).show();
   }
  }

 }