Question

我想增加一个数字，并在一天的特定时间使用AlarmManager在TextView中显示它，但它不起作用。应用正在调试并显示0，但没有增加int数。请帮助，这是代码。

public class MainActivity extends AppCompatActivity {
    TextView tv;
    int a = 3;
    Calendar calendar = Calendar.getInstance();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv = (TextView) findViewById(R.id.tv);

        MyAlarm alarm = new MyAlarm();

        setAlarm(calendar.getTimeInMillis());
        int g = alarm.i;
        tv.setText(String.format("%d", g));
    }

    private void setAlarm(long time) {

        calendar.setTimeInMillis(System.currentTimeMillis());
        //getting the alarm manager
        AlarmManager am = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

        //creating a new intent specifying the broadcast receiver
        Intent i = new Intent(this, MyAlarm.class);

        //creating a pending intent using the intent
        PendingIntent pi = PendingIntent.getBroadcast(this, 0, i, 0);
        calendar.set(Calendar.HOUR_OF_DAY, 17);
        calendar.set(Calendar.MINUTE, 55);
        calendar.set(Calendar.SECOND, 0);
        //setting the repeating alarm that will be fired every day
        am.setRepeating(AlarmManager.RTC, time, AlarmManager.INTERVAL_FIFTEEN_MINUTES, pi);
        Toast.makeText(this, "Alarm is set", Toast.LENGTH_SHORT).show();
    }
}

广泛的演员在这里

public class MyAlarm extends BroadcastReceiver {
    int i;

    @Override
    public void onReceive(Context context, Intent intent) {
        i++;
    }
}

Answer 1

要添加默认构造函数，请在MyAlarm类中尝试以下操作：

MyAlarm(){

}

也添加此方法：

 public int setI(){
     i = i+1;
     return i;
 }

现在应该是这样：

public class MyAlarm extends BroadcastReceiver{
    int i;
    MyAlarm(){
        i=0;
    }

    public int setI(){
        i = i+1;
        return i;
    }

    @Override
    public void onReceive(Context context,Intent intent) {
        i++;
    }
}

现在，在onCreate（）中调用它，它将使i递增。你可以说

int g = myAlarm.setI();

您的setAlarm（）函数中的

或您想增加它的任何位置。 g现在将增加。我希望这会有所帮助！

如何使用警报管理器进行int增加

1 个答案: