Android 开发工具类 16_NotificationActivity

在前台运行的 Activity 可以通过Dialog、Toast 向用户发出提示信息，而后台运行的程序，如下载、收到信息等 Service 应用，则需要使用 Notification(通知)向用户发出提示信息。

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RemoteViews;

public class NotificationActivity extends Activity {
    
    Button b1;
    NotificationManager nmanager;
    Notification notification;
    int notificationID=1;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        setContentView(R.layout.notificationlayout);
        b1=(Button) findViewById(R.id.notification_bt1);
        b1.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) {
                //sendNotification();
                sendCustomNotification();
            }}
        );
    }
    
    // 发送自定义通知
    public void sendCustomNotification(){
        //1.获得 NotificationManager
        nmanager=(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        //2.创建 Notification
        notification =new Notification(
            R.drawable.folder_open,
            "收到文件",
            System.currentTimeMillis()
            );
        RemoteViews rv = new RemoteViews(getPackageName(),R.layout.notificationinterfacelayout);
        rv.setImageViewResource(R.id.notification_img, R.drawable.savefile);
        rv.setTextViewText(R.id.notification_title, "催眠曲.mp3");
        rv.setProgressBar(R.id.notification_progressbar, 100, 20, false);
        notification.contentView=rv;
        //3.设置属性，这些属性会在展开状态栏后显示
        Intent intent =new Intent(this,ToastActivity.class);    //转向其他
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_NEW_TASK); 
        PendingIntent pIntent=PendingIntent.getActivity(this, 0, intent, 0);
        notification.contentIntent=pIntent;
        //4.将Notification发给Manager
        nmanager.notify(notificationID++, notification);
    }
    
    // 发送通知
    public void sendNotification(){
        //1.获得NotificationManager
        nmanager=(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        //2.创建Notification
        notification =new Notification(
            R.drawable.folder_open,
            "收到文件",
            System.currentTimeMillis()
            );
        // 可选属性
        notification.defaults|=Notification.DEFAULT_SOUND;
        notification.flags |=Notification.FLAG_INSISTENT;
        
        
        // 3.设置属性，这些属性会在展开状态栏后显示
        Intent intent =new Intent(this,ToastActivity.class);    //转向其他
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_NEW_TASK); 
        PendingIntent pIntent=PendingIntent.getActivity(this, 0, intent, 0);
        notification.setLatestEventInfo(this, "接收文件", "文件已经下载完成", pIntent);
        // 4.将 Notification 发给 Manager
        nmanager.notify(notificationID++, notification);
    }
    
}