通知的实现代码

1.在XML文件控件中设置：

<Button
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:onClick="sendNotify"
    android:text="默认的通知"/>

2.代码实现：

public class MainActivity extends AppCompatActivity {
    private NotificationManager systemService;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        systemService = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

    }
    public void sendNotify(View view){
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this);

        builder.setContentTitle("通知标题");
        builder.setContentText("通知内容");
        //通知小图标
        builder.setSmallIcon(R.mipmap.ic_launcher);
        //点击通知后自动清除
        builder.setAutoCancel(true);
        builder.setTicker("您有一条信息，请注意查收！！！！！");
        builder.setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher));
        builder.setWhen(System.currentTimeMillis());
        //点击跳转
        Intent in = new Intent(MainActivity.this,AActivity.class);
        PendingIntent pend = PendingIntent.getActivity(this,0,in,PendingIntent.FLAG_CANCEL_CURRENT);
        builder.setContentIntent(pend);
        builder.setNumber(2);
        Notification not = builder.build();
        systemService.notify(1,not);
    }
}