Service通知Activity(Messenger)

Layout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.hzx.servuce_update_ui.MainActivity">

    <Button
        android:id="@+id/start_service"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="start service"/>

    <Button
        android:id="@+id/bind_service"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="bing service"/>

    <TextView
        android:id="@+id/show_textView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

Service

package com.example.hzx.servuce_update_ui;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.util.Log;

/**
 * Created by hzx on 2018/11/5.
 */

public class MyService extends Service {

    public static final int UPDATE_TEXT = 1;
    private final String TAG = "123";
    private Handler handler;
    private MyBinder mBinder = new MyBinder();
    private int ble_count;
    private MyThread myThread;
    class MyBinder extends Binder {

        public void init_handler(Handler handler){
            Log.d(TAG,"-->init_handler");
            set_handler(handler);
        }

        public int  start_Thread(){
            if (get_handler() == null)  {
                Log.d(TAG,"-->get_handler() == null");
                return -1;
            }

            Log.d(TAG,"-->start_Thread");

            myThread = new MyThread ();
            myThread.start();

            return 0;
        }
    }
    private void set_handler(Handler handler){
        this.handler = handler;
    }
    private Handler get_handler(){
        return this.handler;
    }
    private void setBle_count(int ble_count){
        this.ble_count  = ble_count;
    }
    private int getBle_count(){
        return this.ble_count;
    }
    public MyService(){
        this.handler = null;
        //this.mBinder = null;
        this.ble_count  = 0;
    }

    class MyThread extends Thread {

        public void run() {
            while(true) {
                Message message = new Message();
                message.what = UPDATE_TEXT;
                Bundle bundle = new Bundle();
                int temp;
                temp = getBle_count();
                bundle.putString("ble", "" + temp);
                temp++;
                setBle_count(temp);
                message.setData(bundle);
                get_handler().sendMessage(message);

                Log.d(TAG, "-->Threa send:" + temp);

                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    Log.d(TAG, "-->InterruptedException:" + temp);
                    e.printStackTrace();
                }
            }
        }
    }
    public IBinder onBind(Intent intent){
        return  mBinder;
    }

    public void onCreate(){
        super.onCreate();
        Log.d(TAG,"-->onCreate");
    }

    public int  onStartCommand(Intent intent, int flags, int startId){
        Log.d(TAG,"-->onStartCommand");


        return super.onStartCommand(intent,flags,startId);
    }

    public void onDestroy(){
        Log.d(TAG,"-->onDestroy");
        super.onDestroy();
    }
}

MaintActivity

package com.example.hzx.servuce_update_ui;

import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    private final String TAG = "123";
    public static final int UPDATE_TEXT = 1;
    private MyService.MyBinder myBinder;
    private TextView show_textView;
    private Handler handler;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button startService = (Button)findViewById(R.id.start_service);
        startService.setOnClickListener(MainActivity.this);

        Button bingService = (Button)findViewById(R.id.bind_service);
        bingService.setOnClickListener(MainActivity.this);

        show_textView = (TextView)findViewById(R.id.show_textView);
        show_textView.setText("123");
        handler = new FirstHandler();
    }
    private ServiceConnection connetction = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
            Log.d(TAG,"activity onServiceConnected");
            myBinder = (MyService.MyBinder)iBinder;

            myBinder.init_handler(handler);
            myBinder.start_Thread();
        }

        @Override
        public void onServiceDisconnected(ComponentName componentName) {

        }
    };

    class FirstHandler extends Handler{
        public void handleMessage(Message msg){
            int what = msg.what;
            Log.d(TAG,"activity handleMessage:"+what);
            switch (what){
                case UPDATE_TEXT:
                    String string = msg.getData().getString("ble");
                    show_textView.setText(string);
                    break;
            }
        }
    }

    public void onClick(View v){
        switch (v.getId()){
            case R.id.start_service:
                Log.d(TAG,"activity start_service");
                Intent startIntent = new Intent(this,MyService.class);
                startService(startIntent);
                break;

            case R.id.bind_service:
                Log.d(TAG,"activity bind_service");
                Intent bindIntent = new Intent(this,MyService.class);
                bindService(bindIntent,connetction,BIND_AUTO_CREATE);
                break;

            default:
                break;
        }
    }
}

注意：
1、 需要在AndroidManifest.xml文件注册
<service android:name=".MyService"/>

效果：