<?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=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

<!--    //1.4============================================-->
<!--    <Button-->
<!--        android:id="@+id/btnStartAppService"-->
<!--        android:layout_width="match_parent"-->
<!--        android:layout_height="wrap_content"-->
<!--        android:text="启动服务" />-->

<!--    <Button-->
<!--        android:id="@+id/btnStopAppService"-->
<!--        android:layout_width="match_parent"-->
<!--        android:layout_height="wrap_content"-->
<!--        android:text="停止服务" />-->

<!--    //==================================================-->

        //2.2============================================
        <Button
            android:id="@+id/btnStartAppService"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="启动外部服务" />

        <Button
            android:id="@+id/btnStopAppService"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="停止外部服务" />
        <Button
            android:id="@+id/btnBindAppService"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="绑定外部服务" />

        <Button
            android:id="@+id/btnUnbindAppService"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="解除绑定外部服务" />

        //==================================================

</LinearLayout>

package com.imooc.anotherapp;

import androidx.appcompat.app.AppCompatActivity;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;

public class MainActivity extends AppCompatActivity implements View.OnClickListener, ServiceConnection {

    private Intent serviceIntent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //1.8=======================================================
        serviceIntent = new Intent();
        serviceIntent.setComponent(new ComponentName("com.imooc.startservicefromanotherapp","com.imooc.startservicefromanotherapp.AppService"));

        //1.5==============================================================
        findViewById(R.id.btnStartAppService).setOnClickListener(this);
        findViewById(R.id.btnStartAppService).setOnClickListener(this);
        //2.3=========
        findViewById(R.id.btnBindAppService).setOnClickListener(this);
        findViewById(R.id.btnUnbindAppService).setOnClickListener(this);
        //=================================================================
    }

    @Override
    public void onClick(View v) {
        //1.6============================================================
        switch (v.getId()){
            case R.id.btnStartAppService:
               //1.7通过报名来启动app
                Intent i = new Intent();
                //通过setComponent来启动，第一个参数是包名，第二个参数是包名+类名
                //1.9=========================================
                startService(serviceIntent);
                break;
            case R.id.btnStopAppService:
                stopService(serviceIntent);
                break;
            //2.4===========
            case R.id.btnBindAppService:
                bindService(serviceIntent,this, Context.BIND_AUTO_CREATE);
                break;
            case R.id.btnUnbindAppService:
                unbindService(this);
                break;

        }
    }

    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        //2.5==============
        System.out.println("Bind Service");
        System.out.println(service);
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {

    }
}

package com.imooc.startservicefromanotherapp;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.RemoteException;

public class AppService extends Service {
    public AppService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        //2.1 build---rebuild project
        return new IAppServiceRemoteBinder.Stub() {
            @Override
            public void basicTypes(int anInt, long aLong, boolean aBoolean, float aFloat, double aDouble, String aString) throws RemoteException {

            }
        };
    }

    //1.10===========


    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return super.onStartCommand(intent, flags, startId);
    }

    //1.1===================================================
    @Override
    public void onCreate() {
        super.onCreate();

        System.out.println("Service started");
    }

    @Override
    public void onDestroy() {
        super.onDestroy();

        System.out.println("Service destory");
    }
    //===================================================
}


///通过其他app启动StarServiceFromAnother这app

package com.imooc.startservicefromanotherapp;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    //1.2
        startService(new Intent(this,AppService.class));

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
    //1.3
        stopService(new Intent(this,AppService.class));
    }
}