Question

我是Android开发的新手，我需要根据以下两种情况发送通知：

On＆＃34; showNotification＆＃34;按钮单击使用＆＃34; showNotification＆＃34;方法
使用＆＃34; alertNotification＆＃34;经过一段时间（＆＃34后5秒; alertNotification＆＃34;我的示例中点击了按钮）方法如下：

第一个案例完美无缺。但是，我遇到了第二种情况的问题。

我按照https://www.rosettacode.org/wiki/Dynamic_variable_names#JavaScript

以下是我的代码：

MainActivity.java

public class MainActivity extends Activity {
    // Send Notification on button click
    Button showNotification;
    // Send Notification 5 second after on button click
    Button alertNotification;
    NotificationManager notificationManager;
    boolean isNotificActive = false;

    int notifID = 33;

    public static final int NOTIFICATION_ID = 1;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sample_layout);

        showNotification = (Button) findViewById(R.id.showNotification);
        alertNotification = (Button) findViewById(R.id.alerNotification);
    }

    public void showNotification(View view) {
        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                .setContentTitle("Notification")
                .setContentText("New Notification")
                .setTicker("Alert New Notification")
                .setSmallIcon(R.drawable.ic_stat_notification);

        Intent moreInfoIntent = new Intent(this, MoreNotification.class);
        TaskStackBuilder stackBuilder = null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN) {
            stackBuilder = TaskStackBuilder.create(this);

            stackBuilder.addParentStack(MoreNotification.class);
            stackBuilder.addNextIntent(moreInfoIntent);

            PendingIntent pendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.    FLAG_UPDATE_CURRENT);

            notificationBuilder.setContentIntent(pendingIntent);

            notificationManager = (NotificationManager) getSystemService(Context.    NOTIFICATION_SERVICE);

            notificationManager.notify(notifID, notificationBuilder.build());

            isNotificActive = true;
        }
    }

    public void alertNotification(View view) {
        Long alertTime = new GregorianCalendar().getTimeInMillis()+5*1000;
        Intent alertIntent = new Intent(this, AlertReceiver.class);

        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

        alarmManager.set(AlarmManager.RTC_WAKEUP, alertTime, PendingIntent.getBroadcast(
                this, 1, alertIntent, PendingIntent.FLAG_UPDATE_CURRENT));

        Log.e("alarmManager", "alarmManager");
    }
}

AlertReceiver.java

public class AlertReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.e("onReceive", "onReceive");
        createNotification(context, "Times UP", "5 Seconds Has Passed", "Alert");
    }

    public void createNotification(Context context, String msg, String msgText, String msgAlert) {
        PendingIntent notificationIntent = PendingIntent.getActivity(context, 0,
                new Intent(context, MainActivity.class), 0);

        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context)
                .setSmallIcon(R.drawable.ic_stat_notification)
                .setContentTitle(msg)
                .setTicker(msgAlert)
                .setContentText(msgText);

        mBuilder.setContentIntent(notificationIntent);
        mBuilder.setDefaults(NotificationCompat.DEFAULT_SOUND);
        mBuilder.setAutoCancel(true);

        NotificationManager mNotificationManager = (NotificationManager) context.getSystemService(      Context.NOTIFICATION_SERVICE);

        mNotificationManager.notify(1, mBuilder.build()); 
    }
}

的AndroidManifest.xml

<!-- Min/target SDK versions (<uses-sdk>) managed by build.gradle -->

<uses-permission android:name="com.android.alarm.permission.SET_ALARM" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme">
    <activity
        android:name=".MainActivity"
        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=".MoreNotification"
        android:label="More Notification"
        android:parentActivityName=".MainActivity">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value=".MainActivity"/>


    </activity>
</application>

Answer 1

AlertReceiver必须在AndroidManifest.xml注册。

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme">

    <!-- Your stuff here. -->

    <receiver android:name=".AlertReceiver"/>

</application>

根据Android时间发送通知

1 个答案: