Android开发笔记——Android 9发送通知

àì夳堔傛蜴生んèń 2021-09-11 02:12 362阅读 0赞

### Android 9 发送通知 ###

*  发送通知
 *   *  布局文件
     *  程序代码
     *  运行截图

# 发送通知 #

## 布局文件 ##

<?xml version="1.0" encoding="utf-8"?>
    
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical">
    
        <Button android:id="@+id/send_notify" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:text="send_notify" />
    </LinearLayout>

## 程序代码 ##

package cn.fanchencloud.studyapplication;
    
    import android.app.Notification;
    import android.app.NotificationChannel;
    import android.app.NotificationManager;
    import android.content.Context;
    import android.os.Build;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.View;
    import android.widget.Button;
    
    import androidx.annotation.RequiresApi;
    import androidx.appcompat.app.AppCompatActivity;
    import androidx.core.app.NotificationCompat;
    
    import java.io.BufferedReader;
    import java.io.BufferedWriter;
    import java.io.FileInputStream;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.io.OutputStreamWriter;
    
    public class MainActivity extends AppCompatActivity implements View.OnClickListener { 
        /** * 通知<p>id</p> */
        private static final int NOTIFY_ID = 0x123;
    
        private Button sendNoticeButton;
        // 通知相关
        // 渠道id
        private String channelId = "channelId1";
        private NotificationManager notificationManager;
    
        @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN)
        @Override
        protected void onCreate(Bundle savedInstanceState) { 
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            //新建通知管理器
            notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
            addNotificationChannel();
            sendNoticeButton = findViewById(R.id.send_notify);
            sendNoticeButton.setOnClickListener(this);
        }
    
        @Override
        protected void onDestroy() { 
            super.onDestroy();
        }
    
    
        @Override
        public void onClick(View v) { 
            switch (v.getId()) { 
                case R.id.send_notify:
                    Log.d("MainActivity", "点击按钮！");
                    sendNotification("还不赶紧关注公众号", "点击查看详情！");
                    break;
                default:
                    break;
            }
        }
    
        private void sendNotification(String title, String content) { 
            Notification notification;
            if (Build.VERSION.SDK_INT >= 26) { 
                //当sdk版本大于26
                notification = new Notification.Builder(MainActivity.this, channelId)
                        .setCategory(Notification.CATEGORY_MESSAGE)
                        .setSmallIcon(R.mipmap.ic_launcher_copy)
                        .setContentTitle(title)
                        .setContentText(content)
                        .setAutoCancel(true)
                        .build();
            } else { 
                //当sdk版本小于26
                notification = new NotificationCompat.Builder(MainActivity.this, channelId)
                        .setContentTitle("This is content title")
                        .setContentText("This is content text")
                        .setSmallIcon(R.mipmap.ic_launcher_copy)
                        .build();
            }
            notificationManager.notify(NOTIFY_ID, notification);
        }
    
        public void addNotificationChannel() { 
            //当sdk版本大于26
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { 
                //创建通知渠道
                CharSequence name = "fanchen_notify";
                String description = "fanchen的通知渠道";
                //重要性级别 这里用默认的
                int importance = NotificationManager.IMPORTANCE_DEFAULT;
                NotificationChannel mChannel = null;
                mChannel = new NotificationChannel(channelId, name, importance);
                //渠道描述
                mChannel.setDescription(description);
                //是否显示通知指示灯
                mChannel.enableLights(true);
                //是否振动
                mChannel.enableVibration(true);
                //创建通知渠道
                notificationManager.createNotificationChannel(mChannel);
            }
        }
    }

## 运行截图 ##

![运行截图][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNDY2NDY2_size_16_color_FFFFFF_t_70_pic_center]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzNDY2NDY2_size_16_color_FFFFFF_t_70_pic_center]: /images/20210911/343667f26ff647ada9979863b03e9ddd.png