Question

我参考了以下链接来研究Android中通知服务的演示示例：Sai Geetha Blog和Vogella Tutorial。

两者都有效但部分是因为我已经按原样下载了两个项目并执行了它们。两者都有按钮来发起通知。按钮点击通知显示在顶部状态栏中。

问题出现了，点击该通知后，既没有显示任何消息，也没有触发意图导航到新活动。

我是这个概念的新手，所以任何帮助都要赞赏...

的 CODE 的

CreateNotification .class

public class CreateNotification extends Activity {

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

    public void notify(View view) {
        NotificationManager nm= (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        final int UNIQUE_ID = 123458;
        Intent navigationIntent = new Intent();
        navigationIntent.setClass(CreateNotification.this,
                NotificationReceiver.class);

        PendingIntent pi = PendingIntent.getActivity(this, 0, navigationIntent,
                0);
        String body = "New Notification added!!!";
        String title = "Title";
        Notification n = new Notification(R.drawable.ic_launcher, body,
                System.currentTimeMillis());
        n.number = 2;
        n.setLatestEventInfo(this, title, body, pi);
        n.defaults = Notification.DEFAULT_ALL;
        nm.notify(UNIQUE_ID, n);
    }
}

NotificationReceiver.class

public class NotificationReceiver extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.result);
        Log.i("Receiver", "NotificationReceiver");
    }
}

main.xml中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Button
        android:id="@+id/button1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:onClick="notify"
        android:text="Create Notification" >
    </Button>

</LinearLayout>

为result.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="This is the result activity opened from the notification" >
    </TextView>

</LinearLayout>

的AndroidManifest.xml

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

    <uses-sdk android:minSdkVersion="10" />
    <uses-permission android:name="android.permission.VIBRATE" />
    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".CreateNotification"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".NotificationReceiver" />
    </application>

</manifest>

Answer 1

请尝试修改行：

PendingIntent pi = PendingIntent.getActivity(this, 0, navigationIntent, 0);

到

PendingIntent pi = PendingIntent.getActivity(this, 0, navigationIntent, Intent.FLAG_ACTIVITY_NEW_TASK);

文档：

请注意，活动将在现有活动的上下文之外启动，因此您必须在Intent中使用Intent.FLAG_ACTIVITY_NEW_TASK启动标记。

附在我的代码下方。对我来说它运作正常。

private void showNotification() {
    Log.i(TAG, "showNotification called...");
    final Intent notificationIntent = new Intent(this, UpdateApplicationActivity.class);
    notificationIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    final PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);

    final Notification notification = new Notification(R.drawable.htc_notification, getString(R.string.UpdateCheck_update_available), System.currentTimeMillis());
    notification.defaults |= Notification.DEFAULT_ALL;
    notification.flags |= Notification.FLAG_ONLY_ALERT_ONCE | Notification.FLAG_SHOW_LIGHTS | Notification.FLAG_AUTO_CANCEL;
    notification.setLatestEventInfo(this, getString(R.string.UpdateCheck_notification_title), getString(R.string.UpdateCheck_notification_message), contentIntent);

    // Notifying the user about the new update.
    if (notificationManager != null) {
        notificationManager.notify(APP_UPDATE_NOTIFICATION, notification);
    }
}

无法实现通知服务

1 个答案: