Question

您好我是Java和Android的新手，我正在尝试使用带有计时器的alarmmanager在按下startButton后每隔10秒显示一次吐司。 10秒后什么也没发生，我不知道为什么。

您能查看我的代码并帮助我识别和解决问题吗？

三江源。

变量 - journeycount = chronometer，pendingIntent mAlarmSender

主类 - SafeDrive3Activity

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

            journeycount = (Chronometer) findViewById(R.id.journeycount);
            // Watch for button clicks.
            startButton = (Button) findViewById(R.id.startButton);
            startButton.setOnClickListener(mStartListener);

            resetButton = (Button) findViewById(R.id.resetButton);
            resetButton.setOnClickListener(mResetListener);

        }

View.OnClickListener mStartListener = new OnClickListener() {
    public void onClick(View v) {

      int stoppedMilliseconds = 0;

      String chronoText = journeycount.getText().toString();
      String array[] = chronoText.split(":");

      if (array.length == 2) {
        stoppedMilliseconds = Integer.parseInt(array[0]) * 60 * 1000
            + Integer.parseInt(array[1]) * 1000;
      } else if (array.length == 3) {
        stoppedMilliseconds = Integer.parseInt(array[0]) * 60 * 60 * 1000 
            + Integer.parseInt(array[1]) * 60 * 1000
            + Integer.parseInt(array[2]) * 1000;
      }

      journeycount.setBase(SystemClock.elapsedRealtime() - stoppedMilliseconds);
      journeycount.start();
      startButton.setText("Driving..."); // changes button text value to 'Driving...'
      startButton.setOnClickListener(mStartListener);

      Calendar cal = Calendar.getInstance();
      cal.setTimeInMillis(System.currentTimeMillis());
      // add 10 seconds to calendar object
      cal.add(Calendar.SECOND, 10);
      mAlarmSender = PendingIntent.getBroadcast(SafeDrive3Activity.this,
              0, new Intent(SafeDrive3Activity.this, MyTimeReceiver.class), 0);

      // Schedule the alarm!
      AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
      am.set(AlarmManager.RTC_WAKEUP,
                      cal.getTimeInMillis(), mAlarmSender);

    }
    };

        View.OnClickListener mResetListener = new OnClickListener() {
              public void onClick(View v) {
                  Button startButton;
                  startButton = (Button) findViewById(R.id.startButton);
                  startButton.setOnClickListener(mStartListener);
                  journeycount.setBase(SystemClock.elapsedRealtime());

                  startButton.setText("Start Driving");
                  journeycount.setText("00:00");
                  journeycount.stop();

                  AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE); 
                  am.cancel(mAlarmSender);


              }
        };


              };

第二课：

public class MyTimeReceiver extends BroadcastReceiver 

{
    @Override
      public void onReceive(Context context, Intent intent) {
         Toast.makeText(context, "HOUR NOTIFICATION", Toast.LENGTH_LONG).show();

            }
         }

的Manifest.xml：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.Safe"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="14" />

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity
        android:label="@string/app_name"
        android:name=".SafeDrive3Activity" >
        <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER"  />
        </intent-filter>
    <receiver android:name="MyTimeReceiver"></receiver>
        </activity>
    </application>
</manifest>

Answer 1

我认为你应该在这种情况下考虑不同的方法。为什么不使用刚启动消息的Timer？

Timer timer = new Timer();
timer.schedule(new TimerTask() {
    public void run() {
        Toast.makeText(SafeDrive3Activity.this, "Whatever", Toast.LENGTH_LONG).show();
    }
}, 0, 10000);

Answer 2

使用下面的代码集警报管理器

am.set(AlarmManager.RTC_WAKEUP, 
                  SystemClock.elapsedRealtime(),mAlarmSender);

Answer 3

尝试使用以下代码：

AlarmManager alarmMgr = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent serviceIntent = new Intent(context, MyService.class);
PendingIntent pi = PendingIntent.getService(context, 0, serviceIntent, 0);
alarmMgr.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime(), 10000, pi);

我没有使用BroadcastReviver。我每隔10秒就拨打一次服务。

新解决方案：

AlarmManager alarmMgr = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent serviceIntent = new Intent(context, MyActivity.class);
PendingIntent pi = PendingIntent.getService(context, 0, serviceIntent, 0);
alarmMgr.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime(), 10000, pi);

MyActivity：

public class MyActivity extends Activity {
        @Override
          public void onCreate(Bundle savedInstanceState) {
             Toast.makeText(context, "HOUR NOTIFICATION", Toast.LENGTH_LONG).show();
          }
}

Alarmmanager每隔一段时间显示吐司

3 个答案: