Question

我为android设置了一个警报，它还传递了用于对话框的字符串值。我设置的第一个警报工作，它使用我传递的字符串值。但是对于我设置的以下警报，它仍然使用传递的原始字符串值。

我不确定出了什么问题。这是我的代码：

//alert method from the MainActivity
    private void setAlert(int alertType, Calendar alertCalendar) {
        //identify which alert
        switch (alertType) {
            case 1:
                passFunction = "COURSE START";
                passValue = thisTermNum + " is starting on " + oldTermStart;
                break;
            case 2:
                passFunction = "COURSE END";
                passValue = thisTermNum + " is ending on " + oldTermEnd;
                break;
        }

        //actual alert
        AlarmManager alertManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        Intent alertIntent = new Intent(MainActivity.this, AlertReceiver.class);
        Bundle alertBundle = new Bundle();
        alertBundle.putString(PASS_ALERT_FUNCTION, passFunction);
        alertBundle.putString(PASS_ALERT_VALUE, passValue);
        alertIntent.putExtras(alertBundle);
        PendingIntent pendingAlert = PendingIntent.getBroadcast(MainActivity.this, 0, alertIntent, 0);
        alertManager.set(AlarmManager.RTC_WAKEUP, alertCalendar.getTimeInMillis(), pendingAlert);

        Toast.makeText(this, passFunction + " HAS BEEN SET", Toast.LENGTH_SHORT).show();
    }

这是接收器类：

 public class AlertReceiver extends WakefulBroadcastReceiver{

        //for passed values
        String PASS_ALERT_FUNCTION = "PassAlertFunction";
        String PASS_ALERT_VALUE = "PassAlertValue";
        String receivedFunction;
        String receivedValue;


        @Override
        public void onReceive(Context context, Intent intent) {

            //receive passed values
            Bundle getAlertExtra = intent.getExtras();
            receivedFunction = getAlertExtra.getString(PASS_ALERT_FUNCTION);
            receivedValue = getAlertExtra.getString(PASS_ALERT_VALUE);

            //for alert sound
            Uri alertSound = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
            Ringtone alertTone = RingtoneManager.getRingtone(context, alertSound);
            alertTone.play();

            //to pass value to AlertActivity for the alert dialog box
            Intent passAlertValues = new Intent(context, AlertActivity.class);
            Bundle alertBundle = new Bundle();
            alertBundle.putString(PASS_ALERT_FUNCTION, receivedFunction);
            alertBundle.putString(PASS_ALERT_VALUE, receivedValue);
            passAlertValues.putExtras(alertBundle);
            passAlertValues.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            context.startActivity(passAlertValues);
        }
    }

这是AlertActivity类，其中将出现带有传递值的对话框：

 public class AlertActivity extends AppCompatActivity {

        //for passed values
        String PASS_ALERT_FUNCTION = "PassAlertFunction";
        String PASS_ALERT_VALUE = "PassAlertValue";
        String receivedFunction;
        String receivedValue;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_alert);
            setTitle("");

            //receive alert values
            Intent alertValues = getIntent();
            Bundle alertBundle = alertValues.getExtras();
            receivedFunction = alertBundle.getString(PASS_ALERT_FUNCTION);
            receivedValue = alertBundle.getString(PASS_ALERT_VALUE);

            //dialog box for the alert
            AlertDialog.Builder alertBuidler = new AlertDialog.Builder(this);
            alertBuidler.setTitle(receivedFunction)
                    .setMessage(receivedValue)
                    .setCancelable(false)
                    .setPositiveButton("OK", new DialogInterface.OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            Intent intent = new Intent(AlertActivity.this, MainActivity.class);
                            startActivity(intent);
                            finish();
                        }
                    });
            AlertDialog alertDialog = alertBuidler.create();
            alertDialog.show();
        }
    }

Answer 1

对于以下代码行：

PendingIntent pendingAlert = PendingIntent.getBroadcast(MainActivity.this, 0, alertIntent, 0);

对第二个参数使用一些其他int值，否则它将返回相同的待定意图。医生说

PendingIntent返回与之匹配的现有或新PendingIntent 给定参数。仅当FLAG_NO_CREATE已经存在时才可以返回null 提供。

请参阅this了解详情。

Android - 在“警报”对话框

1 个答案: