Android周学习Step By Step（9）--Intent之广播（完）

通过broadcast Intent机制可以将一个Intent发送给任何对这个Intent感兴趣的BroadcastReceiver。

 

通过new Intent（ACTION_1）新建Action为ACTION_1的Intent。

通过sendBroadcast（intent）将这个intent进行广播。代码如下

ActivityMain代码：

package com.eoeandroid.broadcastReceiver;
import android.app.NotificationManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
public class EoeAndroidReceiver2 extends BroadcastReceiver {
    Context context;
    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        this.context = context;
        DeleteNotification();
    }
    private void DeleteNotification() {
        NotificationManager notificationManager = (NotificationManager) context
                .getSystemService(android.content.Context.NOTIFICATION_SERVICE);
        notificationManager.cancel(EoeAndroidReceiver1.NOTIFICATION_ID);

    }
}

当单击MENU的第一项后，程序执行到EoeAndroidReceiver1，通过OnRecievie方法将一个Notification显示在了状态栏中。其中showNotification（）负责显示一个Notification。代码如下：

EoeAndroidReceiver1代码

package com.eoeandroid.broadcastReceiver;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
public class EoeAndroidReceiver1 extends BroadcastReceiver {
    Context context;
    public static int NOTIFICATION_ID = 21321;
    @Override
    public void onReceive(Context context, Intent intent) {
        this.context = context;
        showNotification();
    }
    private void showNotification() {
        NotificationManager notificationManager = (NotificationManager) context
                .getSystemService(android.content.Context.NOTIFICATION_SERVICE);
        Notification notification = new Notification(R.drawable.icon,
                "在EoeAndroidReceiver1中", System.currentTimeMillis());
        PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
                new Intent(context, ActivityMain.class), 0);
        notification.setLatestEventInfo(context, "在EoeAndroidReceiver1中", null,
                contentIntent);
        notificationManager.notify(NOTIFICATION_ID, notification);
    }
}

单击第二个按钮后程序开始广播，这个广播被EoeAndroidReceiver2截获然后开始执行EoeAndroidReceiver2里的OnReceive方法，其中DeleteNotification（）方法负责将刚才生成的Notification从状态栏中删除。代码如下：

EoeAndroidReceiver2代码

package com.eoeandroid.broadcastReceiver;
import android.app.NotificationManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
public class EoeAndroidReceiver2 extends BroadcastReceiver {
    Context context;
    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        this.context = context;
        DeleteNotification();
    }
    private void DeleteNotification() {
        NotificationManager notificationManager = (NotificationManager) context
                .getSystemService(android.content.Context.NOTIFICATION_SERVICE);
        notificationManager.cancel(EoeAndroidReceiver1.NOTIFICATION_ID);
    }
}

Android学习到此告一段落，经过一周的学习（严格的说学习的时间外加写论文的时间是一周，总结、写博客的时间远远大于一周）只能对Android有个大致的了解，还有很多方面由于时间的原因不能够深入学习，甚至很多都没有接触到，以后有时间再学习吧。

Android，有缘我们还会再见！