OkHttp+Service下载APK文件

参考上一篇博客：https://blog.csdn.net/cf8833/article/details/93905187

上一篇博客说到，如何在activity中下载文件，今天把程序改一下，在service中下载文件

服务需要注册，源码全部贴出来了，需要源码的给我留言

1.MainActivity启动服务

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.button5:
                startService(new Intent(getApplicationContext(),DownloadService.class));
                break;
        }
    }

2.下载apk，主要就是把之前的线程，移植到了onCreate里面，注意，服务的启动两种方式startService 和 bindService，不管哪种方式启动，都会执行onCreate方法，我们把线程放到onCreate中即可

package com.example.administrator.testz;

import android.app.Service;
import android.content.Intent;
import android.os.Environment;
import android.os.IBinder;
import android.print.PrinterId;
import android.support.annotation.Nullable;
import android.widget.Toast;

import java.io.File;

import cn.finalteam.okhttpfinal.FileDownloadCallback;
import cn.finalteam.okhttpfinal.HttpRequest;

/**
 * Created by wrs on 2019/9/17,16:59
 * projectName: Testz
 * packageName: com.example.administrator.testz
 */
public class DownloadService extends Service {
    private DownThread mThread;
    final String url = "https://raw.githubusercontent.com/wrs13634194612/Image/master/raw/test.apk";
    String apkName = "test.apk";
    final String FILE_DIR = "TestApk";
    String apkPath = Environment.getExternalStoragePublicDirectory(FILE_DIR) + "/" + apkName;

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }


    @Override
    public void onCreate() {
        super.onCreate();
        mThread = new DownThread();
        mThread.start();

    }

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

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

    class DownThread extends Thread{
        @Override
        public void run() {
            final File saveFile = new File(apkPath);
            System.out.println("filepath: "+apkPath);
            HttpRequest.download(url, saveFile, new FileDownloadCallback() {
                //开始下载
                @Override
                public void onStart() {
                    super.onStart();
                    System.out.println("start");

                }

                //下载进度
                @Override
                public void onProgress(int progress, long networkSpeed) {
                    super.onProgress(progress, networkSpeed);
                    System.out.println("process:" + progress);
                    //String speed = FileUtils.generateFileSize(networkSpeed);
                }

                //下载失败
                @Override
                public void onFailure() {
                    super.onFailure();
                    System.out.println("fail");
                    Toast.makeText(getBaseContext(), "下载失败", Toast.LENGTH_SHORT).show();
                }

                //下载完成（下载成功）
                @Override
                public void onDone() {
                    super.onDone();
                    System.out.println("success");
                    Toast.makeText(getBaseContext(), "下载成功", Toast.LENGTH_SHORT).show();
                }
            });
        }
    }
}

end

另外讲解一下service的两种启动方式

package com.example.administrator.testz;

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

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    private Button button,button2,button3,button4,button5;

    private ServiceConnection serviceConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            Log.e("MainActivity","onServiceConnected");
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            Log.e("MainActivity","onServiceDisconnected");
        }
    };

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

        button = (Button)findViewById(R.id.button);
        button2 = (Button)findViewById(R.id.button2);
        button3 = (Button)findViewById(R.id.button3);
        button4 = (Button)findViewById(R.id.button4);
        button5 = (Button)findViewById(R.id.button5);

        button.setOnClickListener(this);
        button2.setOnClickListener(this);
        button3.setOnClickListener(this);
        button4.setOnClickListener(this);
        button5.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.button:
                startService(new Intent(getApplicationContext(),MyServer.class));
                break;
            case R.id.button2:
                stopService(new Intent(getApplicationContext(),MyServer.class));
                break;
            case R.id.button3:
                Intent intent = new Intent(getApplicationContext(),MyServer.class);
                bindService(intent,serviceConnection,BIND_AUTO_CREATE);
                break;
            case R.id.button4:
                unbindService(serviceConnection);
                break;
            case R.id.button5:
                startService(new Intent(getApplicationContext(),DownloadService.class));
                break;
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unbindService(serviceConnection);
    }
}

自己创建的服务：

package com.example.administrator.testz;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.Log;

/**
 * Created by wrs on 2019/9/17,16:06
 * projectName: Testz
 * packageName: com.example.administrator.testz
 */
public class MyServer extends Service {
    private MyThread mThread;
    private int num = 0;
    private boolean isRunning = true;

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        //bingservice 启动服务时 系统调用此方法
        Log.e("MyServer","onBind");
        return null;
    }

    @Override
    public boolean onUnbind(Intent intent) {
        // bingservice断开连接时，调用此方法
        Log.e("MyServer","onUnbind");
        return super.onUnbind(intent);
    }

    @Override
    public void onRebind(Intent intent) {
        //bindservice重新连接时，调用此方法
        super.onRebind(intent);
        Log.e("MyServer","onRebind");
    }


    @Override
    public void onCreate() {
        //不管哪种服务启动方式 都会调用此方法 只调用一次
        super.onCreate();
        Log.e("MyServer","onCreate");
        mThread = new MyThread();
        mThread.start();


    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        //startservice启动服务时，系统自动调用此方法
        Log.e("MyServer","onStartCommand");
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        //服务不在使用，销毁时，调用此方法
        super.onDestroy();
        isRunning = false;
        Log.e("MyServer","onDestroy");
    }

    class MyThread extends Thread{
        @Override
        public void run() {
            while(isRunning){
                try {
                    Thread.sleep(1000);
                    num++;
                    Log.e("MyServer","MyThread: "+num);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }


}

1.当我们使用startService启动执行的方法：onCreate -> onStartCommand  -> onDestroy

2.使用bingservice启动执行的方法:onCreate -> onBind  -> onUnbind -> onDestroy

注意，bindService启动的服务，必须和activity同时运行，当activity销毁时，必须在ondestroy中销毁service，否则会报错