为什么Android忽略了通知的创建？

Question

我有代码,它只是不起作用,所以我请任何人帮助我.关于这个具体问题的信息非常少.

主要活动

---

public class MainActivity extends Activity {
public final int PENDING_INTENT_ID = 8;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Button clickity = (Button)findViewById(R.id.alarm_button);
    clickity.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Calendar now = Calendar.getInstance();
            now.add(Calendar.SECOND, 20);

            //Create a new PendingIntent used by the Alarm when it activates
            Intent intent = new Intent(v.getContext(), AlarmReciever.class);
            intent.setAction("SOME_AWESOME_TRIGGER_WORD");
            intent.putExtra("info", "This String shows that the info is actually sent correctly");
            PendingIntent pendingIntent = PendingIntent.getBroadcast(v.getContext(), PENDING_INTENT_ID, intent, PendingIntent.FLAG_UPDATE_CURRENT|Intent.FILL_IN_DATA);

            //Then Create the alarm manager to send this pending intent and set the date to go off
            AlarmManager am = (AlarmManager)getSystemService(Activity.ALARM_SERVICE);
            am.set(AlarmManager.RTC_WAKEUP, now.getTimeInMillis(), pendingIntent);

        }
    });

}

---

AlarmReciever(意识到我拼错了但是因为那是怎么回事,我跟它一起去)

---

public class AlarmReciever extends BroadcastReceiver{

@Override
public void onReceive(Context c, Intent arg1) {

    //get a reference to NotificationManager
    String ns = Context.NOTIFICATION_SERVICE;
    NotificationManager mNotificationManager = (NotificationManager) c.getSystemService(ns);

    //Instantiate the notification

    CharSequence tickerText = "Hello";
    long when = System.currentTimeMillis();
    Notification.Builder builder = new Notification.Builder(c)
                                .setTicker(tickerText)
                                .setWhen(when)
                                .setContentTitle(arg1.getStringExtra("info"))
                                .setContentText("Success!!")
                                .setAutoCancel(true);
    Notification notification = builder.getNotification();
    mNotificationManager.notify(0, notification);//note the first argument, the ID should be unique



}
}

---

表现

---

<uses-sdk
    android:minSdkVersion="14"
    android:targetSdkVersion="15" />

<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="com.testproject.AlarmReciever"
        android:enabled="true"
        android:exported="false" >
        <intent-filter>
    </receiver>

</application>

---

这应该是一切.我试图按原样运行它并没有向我展示任何东西.我在模拟器上运行它实际上很重要.

编辑:当我说它不起作用时,我的意思是没有任何东西弹出.它运行良好,但通知永远不会弹出.

问题:

所以这个问题缩小到Android只是忽略了我的通知.问题是它没有告诉我为什么-_-所以我无法解决它.有关此问题的专家看到我的代码调用通知有问题吗？它在模拟器上是否重要？

Answer 1

我遇到了同样的问题.如果在创建"新通知()"时未指定图标,则不会显示通知.

Answer 2

那么,在通知中吸取了教训.我收到错误的原因是因为必须添加img,如果没有,它将不会显示!除了弗拉基米尔慷慨地指出的东西之外,我所拥有的其他一切基本上都是正确的.其他人在测试通知时遇到了类似的问题.

Answer 3

Intent intent = new Intent(v.getContext(), AlarmReciever.class);
// intent.setAction("SOME_AWESOME_TRIGGER_WORD"); replace to:
intent.setAction("com.testproject.SOME_AWESOME_TRIGGER_WORD");

至少第一眼看上去

更新：

long firstTime = SystemClock.elapsedRealtime();

AlarmManager alarmManager = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, firstTime, /* INTERVAL IN MS */ 20 * 1000, /* PendingIntent */ intent);