Question

我已使用PendingIntent设置闹钟，现在我想取消闹钟。但是，尝试这样做会导致整个应用程序崩溃。

以下是我设置闹钟的方法：

private void setAlarm(Calendar targetCal)
{
    Intent alarmintent = new Intent(AddAlarm.this, AlarmReceiver.class);
    alarmintent.putExtra("ALARM_NO", tempx);
    alarmintent.setAction("my.action.string");
    PendingIntent sender = PendingIntent.getBroadcast(AddAlarm.this, pen, alarmintent, PendingIntent.FLAG_ONE_SHOT);

    AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
    alarmManager.setExact(AlarmManager.RTC_WAKEUP, targetCal.getTimeInMillis(), sender);


}

其中pen是UniqueId

现在，我取消闹钟时出现错误。

public void alarmSet1(View view)
{
    //ToggleButton Toggler = (ToggleButton)findViewById(R.id.alarm1);
    int a1=1;
    int idTime = (int) System.currentTimeMillis();
    SharedPreferences.Editor editor = times.edit();
    editor.putInt("ID1", idTime);
    editor.commit();
    if (((ToggleButton) view).isChecked()) {
        Intent intent = new Intent(MainActivity.this, AddAlarm.class);
        intent.putExtra("pendInt", idTime);
        intent.putExtra("tts", a1);
        startActivity(intent);
    }

    else
    {


        int rec = times.getInt("ID1",0);


        Intent myIntent = new Intent(MainActivity.this, AlarmReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(MainActivity.this,
                rec, myIntent, PendingIntent.FLAG_UPDATE_CURRENT);
        pendingIntent.cancel();
        alarmManager.cancel(pendingIntent);

    }
}

以下是logcat：

> 07-29 20:19:06.198  14220-14220/zyia.alarm.zyia.zyia E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: zyia.alarm.zyia.zyia, PID: 14220
    java.lang.IllegalStateException: Could not execute method of the activity
            at android.view.View$1.onClick(View.java:4020)
            at android.view.View.performClick(View.java:4780)
            at android.widget.CompoundButton.performClick(CompoundButton.java:120)
            at android.view.View$PerformClick.run(View.java:19866)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5254)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
     Caused by: java.lang.reflect.InvocationTargetException
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at android.view.View$1.onClick(View.java:4015)
            at android.view.View.performClick(View.java:4780)
            at android.widget.CompoundButton.performClick(CompoundButton.java:120)
            at android.view.View$PerformClick.run(View.java:19866)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5254)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.AlarmManager.cancel(android.app.PendingIntent)' on a null object reference
            at zyia.alarm.zyia.zyia.MainActivity.alarmSet1(MainActivity.java:150)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at android.view.View$1.onClick(View.java:4015)
            at android.view.View.performClick(View.java:4780)
            at android.widget.CompoundButton.performClick(CompoundButton.java:120)
            at android.view.View$PerformClick.run(View.java:19866)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5254)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

寻找任何修复/解决方案:)

Answer 1

此行抛出NullPointerException：

alarmManager.cancel(pendingIntent);

可能是因为alarmManager未初始化。在第一行上方添加此行。

AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);

Answer 2

alarmSet1()未初始化alarmManager，它是null，如堆栈跟踪所示。我不知道你在哪里初始化alarmManager。最有可能的是，你应该摆脱alarmManager并让setAlarm()和alarmSet1()根据需要检索AlarmManager。

Answer 3

看起来alarmManager未被初始化。

取消PendingIntent会导致应用程序

3 个答案: