完成设置闹钟动作时如何获取回调

Question

我正在开发一个一个接一个地执行多个任务的应用程序。其中之一是设置闹钟。这就是为什么我必须在此操作完成后获得回调。我尝试使用活动结果，但它不起作用。这是我的代码：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    setAlarm(new String[] {"0", "42"});
}
private void setAlarm(String[] values) {
    Intent intent = new Intent(AlarmClock.ACTION_SET_ALARM);
    intent.putExtra(AlarmClock.EXTRA_HOUR, Integer.parseInt(values[0]));
    intent.putExtra(AlarmClock.EXTRA_MINUTES, Integer.parseInt(values[1]));
    startActivityForResult(intent, 42);
}
@Override
public void startActivityForResult(Intent intent, int requestCode) {
    super.startActivityForResult(intent, requestCode);
    if (requestCode == 42) {
        Log.i("startActivityForResult", "...");
    }
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    Log.i("onActivityResult", "...");
    if (requestCode == 42) {
        Log.i("onActivityResult", String.valueOf(resultCode));
    }
}

调用了startActivityForResult-method，但onActivityResult-method没有，我不知道为什么。有人可以帮助我吗？

Answer 1

MainActivity.java

public class MainActivity extends Activity {
    TimePicker myTimePicker;
    Button buttonstartSetDialog;
    TextView textAlarmPrompt;
    TimePickerDialog timePickerDialog;
    final static int RQS_1 = 1;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textAlarmPrompt = (TextView) findViewById(R.id.alarmprompt);
        buttonstartSetDialog = (Button) findViewById(R.id.startAlaram);
        buttonstartSetDialog.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                textAlarmPrompt.setText("");
                openTimePickerDialog(false);
            }
        });
    }
    private void openTimePickerDialog(boolean is24r) {
        Calendar calendar = Calendar.getInstance();
        timePickerDialog = new TimePickerDialog(MainActivity.this,
                onTimeSetListener, calendar.get(Calendar.HOUR_OF_DAY),
                calendar.get(Calendar.MINUTE), is24r);
        timePickerDialog.setTitle("Set Alarm Time");
        timePickerDialog.show();
    }
    OnTimeSetListener onTimeSetListener = new OnTimeSetListener() {
        @Override
        public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
            Calendar calNow = Calendar.getInstance();
            Calendar calSet = (Calendar) calNow.clone();
            calSet.set(Calendar.HOUR_OF_DAY, hourOfDay);
            calSet.set(Calendar.MINUTE, minute);
            calSet.set(Calendar.SECOND, 0);
            calSet.set(Calendar.MILLISECOND, 0);
            if (calSet.compareTo(calNow) <= 0) {
                // Today Set time passed, count to tomorrow
                calSet.add(Calendar.DATE, 1);
            }
            setAlarm(calSet);
        }
    };
    private void setAlarm(Calendar targetCal) {
        textAlarmPrompt.setText("nn***n" + "Alarm is set "
                + targetCal.getTime() + "n" + "***n");
        Intent intent = new Intent(getBaseContext(), AlarmReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(
                getBaseContext(), RQS_1, intent, 0);
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        alarmManager.set(AlarmManager.RTC_WAKEUP, targetCal.getTimeInMillis(),
                pendingIntent);
    }  
}

接收者.java

public class AlarmReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context k1, Intent k2) {
        // TODO Auto-generated method stub
         Toast.makeText(k1, "Alarm received!", Toast.LENGTH_LONG).show();
    }
}

main_activity.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="10dp" >
    <Button
        android:id="@+id/startAlaram"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Set Alaram Time" />
    <TextView
        android:id="@+id/alarmprompt"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textColor="#000000" />
</LinearLayout>

清单.xml

<application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/title_activity_main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
         <receiver android:name=".AlarmReceiver" android:process=":remote" />
    </application>

Answer 2

尝试通过检查结果代码而不是请求代码来做到这一点：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
    super.onActivityResult(requestCode, resultCode, data);
    switch (resultCode)
    {
        case RESULT_OK:
            [...]
            break;
        case RESULT_CANCELED:
            [...]
             break;
        default:
            break;
    }
}

我的衣服是在这里复制的：https://stackoverflow.com/a/5674322/10802597