Android Activity 与Service进行数据交互详解

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

  /**
   * 进度条的最大值
   */
  public static final int MAX_PROGRESS = 100;
  /**
   * 进度条的进度值
   */
  private int progress = 0;

  /**
   * 增加get()方法，供Activity调用
   *
   * @return 下载进度
   */
  public int getProgress() {
    return progress;
  }

  /**
   * 模拟下载任务，每秒钟更新一次
   */
  public void startDownLoad(){
    new Thread(new Runnable() {

      @Override
      public void run() {
        while(progress < MAX_PROGRESS){
          progress += 5;

          //进度发生变化通知调用方
          if(onProgressListener != null){
            onProgressListener.onProgress(progress);
          }

          try {
            Thread.sleep(1000);
          } catch (InterruptedException e) {
            e.printStackTrace();
          }

        }
      }
    }).start();
  }

  @Override
  public IBinder onBind(Intent intent) {
    return new MyBinder();
  }

  public class MyBinder extends Binder {
    public MsgService getService() {
      return MsgService.this;
    }
  }

  public interface OnProgressListener {
    void onProgress(int progress);
  }

  /**
   * 更新进度的回调接口
   */
  private OnProgressListener onProgressListener;


  /**
   * 注册回调接口的方法，供外部调用
   *
   * @param onProgressListener
   */
  public void setOnProgressListener(OnProgressListener onProgressListener) {
    this.onProgressListener = onProgressListener;
  }

}

public class MainActivity extends Activity {

  private Button button19;

  private MsgService msgService;
  private int progress = 0;
  private ProgressBar mProgressBar;


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

 


    btnExec = (Button) findViewById(R.id.btnExec);
    button19 = (Button) findViewById(R.id.button19);
    mProgressBar = (ProgressBar) findViewById(R.id.progressBar);


    button19.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
        msgService.startDownLoad();
      }
    });

    Intent intent = new Intent(this, MsgService.class);
    bindService(intent, mServiceConnection, Context.BIND_AUTO_CREATE);

 

  }

 

 

  ServiceConnection mServiceConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
      msgService = ((MsgService.MyBinder) iBinder).getService();

      msgService.setOnProgressListener(new MsgService.OnProgressListener() {
        @Override
        public void onProgress(int progress) {
          mProgressBar.setProgress(progress);
        }
      });
    }

    @Override
    public void onServiceDisconnected(ComponentName componentName) {

    }
  };


  @Override
  protected void onDestroy() {

    unbindService(mServiceConnection);
    super.onDestroy();
  }
}