android - Alarmmanager 每隔一段时间显示 toast

Question

您好，我是 Java 和 android 的新手，我正在尝试将 alarmmanager 与计时器一起使用，以便在按下 startButton 后每 10 秒显示一次 toast 。 10 秒后什么也没有发生，我不确定为什么。

你能看看我的代码并帮助我找出并解决问题吗？

谢谢。

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);


              }
        };


              };    

第二类:

public class MyTimeReceiver extends BroadcastReceiver 

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

            }
         }

list .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

我认为您应该在这种情况下考虑采用不同的方法。为什么不使用仅启动 toast 消息的计时器？

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