034 Android IntentService 的使用

1.service 执行耗时任务的步骤

2.IntentService 

(1)介绍

(2)使用方法

(3)优点

(4)在AndroidManifest.xml文件中添加service设置

<service android:name=".MyIntentService"></service>

(5)java后台代码

MainActivity主界面

package com.lucky.test39intentservice;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    Button button1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button1=findViewById(R.id.button);
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity.this,MyIntentService.class);
                startService(intent);//启动service
            }
        });
    }
}

MyIntentService

package com.lucky.test39intentservice;

import android.app.IntentService;
import android.content.Intent;
import android.util.Log;

public class MyIntentService extends IntentService {

    //构造方法
    public MyIntentService() {
        super("");
    }

    //该方法会在service创建时，就执行
    @Override
    public void onCreate() {
        super.onCreate();
        Log.i("<----------->","任务启动");
    }

    //执行耗时任务
    @Override
    protected void onHandleIntent( Intent intent) {
        int count=100;
        while (count>0){
            Log.i("<---------->",count+"");
            count--;
            try {
                Thread.sleep(500);  //对线程进行延时，模拟现实中执行的任务
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.i("<---------->","任务结束");
    }
}