android prgraming 8.2.1

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新建个项目，修改activity_main.xml

1. <?xml version="1.0" encoding="utf-8"?>
   
2. <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
   
3.     xmlns:app="http://schemas.android.com/apk/res-auto"
   
4.     xmlns:tools="http://schemas.android.com/tools"
   
5.     android:layout_width="match_parent"
   
6.     android:layout_height="match_parent"
   
7.     tools:context="com.example.xinwei.notificationtest.MainActivity">
   
8. 
   
9.     <Button
   
10.         android:id="@+id/send_notice"
    
11.         android:layout_width="wrap_content"
    
12.         android:layout_height="wrap_content"
    
13.         android:text="send notice"/>
    
14. 
    
15. </android.support.constraint.ConstraintLayout>
    

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修改mainactivity.java

1. package com.example.xinwei.notificationtest;
   
2. 
   
3. import android.app.Notification;
   
4. import android.app.NotificationManager;
   
5. import android.app.PendingIntent;
   
6. import android.content.Intent;
   
7. import android.graphics.BitmapFactory;
   
8. import android.support.v7.app.AppCompatActivity;
   
9. import android.os.Bundle;
   
10. import android.support.v7.app.NotificationCompat;
    
11. import android.view.View;
    
12. import android.widget.Button;
    
13. 
    
14. public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    
15. 
    
16.     @Override
    
17.     protected void onCreate(Bundle savedInstanceState) {
    
18.         super.onCreate(savedInstanceState);
    
19.         setContentView(R.layout.activity_main);
    
20.         Button sendNotice=(Button)findViewById(R.id.send_notice);
    
21.         sendNotice.setOnClickListener(this);
    
22.     }
    
23. 
    
24.     @Override
    
25.     public void onClick(View view) {
    
26.         Intent[] intent=new android.content.Intent[]{new Intent(this,NotificationActivity.class)};
    
27.         PendingIntent pi= PendingIntent.getActivities(this,0,intent,0);
    
28.         NotificationManager manager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
    
29.         Notification notification=new NotificationCompat.Builder(this)
    
30.                 .setContentTitle("This is content icon")
    
31.                 .setContentText("This is content text")
    
32.                 .setWhen(System.currentTimeMillis())
    
33.                 .setSmallIcon(R.mipmap.ic_launcher)
    
34.                 .setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher))
    
35.                 .setContentIntent(pi)
    
36.                 .setAutoCancel(true)
    
37.                 .build();
    
38.         manager.notify(1,notification);
    
39. 
    
40.     }
    
41. }
    

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再新建个NotificationActivity.java的空活动，把布局文件命名为notification_layout.xml,然后把布局文件修改为

1. <?xml version="1.0" encoding="utf-8"?>
   
2. <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
   
3.     xmlns:app="http://schemas.android.com/apk/res-auto"
   
4.     xmlns:tools="http://schemas.android.com/tools"
   
5.     android:layout_width="match_parent"
   
6.     android:layout_height="match_parent"
   
7.     tools:context="com.example.xinwei.notificationtest.NotificationActivity">
   
8.     <TextView
   
9.         android:layout_width="wrap_content"
   
10.         android:layout_height="wrap_content"
    
11.         android:text="This is notification layout"
    
12.         android:textSize="24sp"/>
    
13. </android.support.constraint.ConstraintLayout>
    

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效果图：