android学习笔记(14)Status Bar Notification 状态栏、通知栏推送

迈不过友情╰ 2022-08-04 15:45 223阅读 0赞

Status Bar Notification 添加一个icon到系统状态栏中(可选择是否有文本信息),添加一段信息到Notification(通知栏)窗口中

当在后台运行的服务需要与用户进行交互时我们可以使用status bar notification

源码

MainActivity.java

package com.example1.examplestatusbar;
    
    import android.net.sip.SipAudioCall.Listener;
    import android.os.Bundle;
    import android.app.Activity;
    import android.app.NotificationManager;
    import android.content.Intent;
    import android.view.Menu;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.Toast;
    
    public class MainActivity extends Activity {
    private Button btn;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            btn = (Button)findViewById(R.id.btnstartservice);
            btn.setOnClickListener(listener);
        
        }
        //记住，如果没有复写onStart()中的内容的话，当你点击通知栏返回mainactivity后，status bar中的内容不会消失，如果熟悉activity生命周期的话就很容易理解这点
        @Override
    	protected void onStart() {
    		NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    		manager.cancel(R.layout.activity_main);
    		super.onStart();
    	}
    
    	private OnClickListener listener =new OnClickListener() {
    		
    		@Override
    		public void onClick(View arg0) {
    			Intent intent = new Intent(MainActivity.this,StatusService.class);
    			startService(intent);
    			
    		}
    		
    	};
    
    }

StatusService.java

package com.example1.examplestatusbar;
    
    import android.app.IntentService;
    import android.app.Notification;
    import android.app.NotificationManager;
    import android.app.PendingIntent;
    import android.content.Intent;
    import android.util.Log;
    import android.widget.Toast;
    
    public class StatusService extends IntentService {
    
    	public StatusService() {
    		super("StatusService");
    		
    	}
    
    	@Override
    	protected void onHandleIntent(Intent arg0) {
    		 		
    		showNotification(false);
    		try {
    			Thread.sleep(10000);//模拟下载过程
    			showNotification(true);
    		} catch (InterruptedException e) {
    			e.printStackTrace();
    		}
    			
    	}
    
    	private void showNotification(boolean finish) {
    		Intent intent = new Intent(this,MainActivity.class);
    		//理解不了，照着写就行。
    		PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    		Notification notification = null;
    		if (!finish) {
    			notification = new Notification(R.drawable.ic_launcher, "开始下载", System.currentTimeMillis());
    			//第一个参数是引用图标的位置
    			notification.setLatestEventInfo(this, "下载", "正在下载中...", contentIntent);
    		}
    		else {
    			notification = new Notification(R.drawable.ic_launcher, "下载完毕", System.currentTimeMillis());
    			notification.setLatestEventInfo(this, "下载", "已经下载完毕...", contentIntent);
    		}
    		NotificationManager manager =(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    		manager.notify(R.layout.activity_main,notification);
    	}
    
    }

![Center][] ![20150905133722574][] ![20150905133726392][]

[Center]: https://img-blog.csdn.net/20150905133717104?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center
[20150905133722574]: https://img-blog.csdn.net/20150905133722574
[20150905133726392]: /images/20220731/53bff516cfe448718c942ed3e2536275.png