package net.codepig.servicedownloaderdemo;

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

public class MainActivity extends AppCompatActivity {
  private String _url="http://www.boosj.com/apk/boosjDance.apk";
  private EditText urlText;
  private Button goBtn;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    goBtn=(Button) findViewById(R.id.goBtn);
    urlText=(EditText) findViewById(R.id.urlText);
    urlText.setText(_url);
    goBtn.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
        _url=urlText.getText().toString();
        //start download
        start_service();
      }
    });
  }

  public void start_service(){
    //等会再填
  }
}

package net.codepig.servicedownloaderdemo;

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

/**
 * 下载服务
 * Created by QZD on 2017/9/20.
 */

public class DownLoadService extends IntentService {
  public DownLoadService() {
    super("DownLoadService");//这就是个name
  }

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

  protected void onHandleIntent(Intent intent) {
    Bundle bundle = intent.getExtras();
    String downloadUrl = bundle.getString("download_url");

    Log.d(TAG,"下载启动："+downloadUrl);
    Thread.sleep(1_000);
    int count=0;
    while(count<20){
      count++;
      Log.d(TAG,"下载运行中--"+count);
      Thread.sleep(1000);
    }
    Log.d(TAG,"下载结束");
  }

  @Override
  public void onDestroy() {
    Log.d(TAG, "onDestroy");
    super.onDestroy();
  }
}

public void start_service(){
    Intent intent=new Intent(this,DownLoadService.class);
    intent.putExtra("download_url",_url);
    startService(intent);
  }