Service与Activity通信

1、因为一个服务可以startService多次（每次都会调用onStartCommand），所以可以利用Intent传值。

• intent.putExtra("data",text.getText().toString());
  startService(intent);

• public int onStartCommand(Intent intent, int flags, int startId) {
  data = intent.getStringExtra("data");
  return super.onStartCommand(intent, flags, startId);
  }

2、利用返回来的binder，对service数据进行操作。

• 　　Service代码

  public class Myservice extends Service {
  
      private boolean doing = true;
      private String data="default";
      
      @Override
      public IBinder onBind(Intent intent) {
          return new MyBinder();
      }
      
      @Override
      public void onCreate() {
          
          doing = true;
          new Thread(){
                  @Override
                  public void run() {
                      while (doing) {
                          Log.v("service",data);
                          try {
                              sleep(1000);
                          } catch (InterruptedException e) {
                              e.printStackTrace();
                          }
                      }
                  };
          }.start();
          super.onCreate();
      }
      
      @Override
      public int onStartCommand(Intent intent, int flags, int startId) {
          data = intent.getStringExtra("data");
          return super.onStartCommand(intent, flags, startId);
      }
      
      @Override
      public void onDestroy() {
          doing = false;
          Log.v("service","服务停止");
          super.onDestroy();
      }
      
      public class MyBinder extends android.os.Binder{
          public void Setdate(String data) {
              Myservice.this.data = data;
          }
      }
  }

   

• 获取binder ：

  @Override
  public void onServiceConnected(ComponentName name, IBinder service) {
  binder = (MyBinder) service;
  Log.v("service","绑定成功");
  }

3、通过回调（Service的开启的线程调用）和线程间发消息（hander）来实现对Service的监听。

• 注意：辅助线程是不能够操作ui线程的资源的。这是android的一种保护机制。
• MainActivity代码：

• package com.example.connectservice;
  
  import com.example.connectservice.Myservice.MyBinder;
  
  import android.app.Activity;
  import android.app.Service;
  import android.content.ComponentName;
  import android.content.Context;
  import android.content.Intent;
  import android.content.ServiceConnection;
  import android.opengl.ETC1;
  import android.os.Binder;
  import android.os.Bundle;
  import android.os.Handler;
  import android.os.IBinder;
  import android.os.Message;
  import android.util.Log;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.view.View;
  import android.view.View.OnClickListener;
  import android.widget.EditText;
  import android.widget.TextView;
  
  
  public class MainActivity extends Activity implements OnClickListener, ServiceConnection {
  
      
      EditText text ;
      
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          
          text = (EditText)findViewById(R.id.et);
          
          findViewById(R.id.btStartService).setOnClickListener(this);
          findViewById(R.id.btStopService).setOnClickListener(this);
          findViewById(R.id.btnBind).setOnClickListener(this);
          findViewById(R.id.btnUnBind).setOnClickListener(this);
          findViewById(R.id.btnSycnData).setOnClickListener(this);
      }
  
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          // Inflate the menu; this adds items to the action bar if it is present.
          getMenuInflater().inflate(R.menu.main, menu);
          return true;
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {
          // Handle action bar item clicks here. The action bar will
          // automatically handle clicks on the Home/Up button, so long
          // as you specify a parent activity in AndroidManifest.xml.
          int id = item.getItemId();
          if (id == R.id.action_settings) {
              return true;
          }
          return super.onOptionsItemSelected(item);
      }
  
  
      @Override
      public void onClick(View v) {
          Intent intent = new Intent(MainActivity.this,Myservice.class);
          switch (v.getId()) {
          case R.id.btStartService:
              intent.putExtra("data",text.getText().toString());
              startService(intent);
              break;
              
          case R.id.btStopService:
              stopService(intent);
              break;
          case R.id.btnBind:
              bindService(new Intent(this, Myservice.class), this,Context.BIND_AUTO_CREATE);
              break;
              
          case R.id.btnUnBind:
              unbindService(this);
              break;        
          case R.id.btnSycnData:
              if (binder != null) {
                  binder.Setdate(text.getText().toString());
              }
              break;
          }
      }
  
      public Myservice.MyBinder binder;
      private Handler handler = new Handler(){
          @Override
          public void handleMessage(Message msg) {
              ((TextView)findViewById(R.id.tv)).setText(msg.getData().getString("data"));
          }
      };
      @Override
      public void onServiceConnected(ComponentName name, IBinder service) {
          binder = (MyBinder) service;
          binder.SetCallBack(new Myservice.CallBack() {
              
              @Override
              public void onDataChange(String data) {
                  Message msgMessage = new Message();
                  Bundle bundle = new Bundle();
                  bundle.putString("data", data);
                  msgMessage.setData(bundle);
                  handler.sendMessage(msgMessage);
              }
          });
          Log.v("service","绑定成功");
      }
  
  
      @Override
      public void onServiceDisconnected(ComponentName name) {
      }
      
  }

   

• Myservice代码：

• package com.example.connectservice;
  
  import android.R.integer;
  import android.R.string;
  import android.app.Application;
  import android.app.Service;
  import android.content.Intent;
  import android.os.Binder;
  import android.os.IBinder;
  import android.util.Log;
  
  public class Myservice extends Service {
  
      private boolean doing = true;
      private String data="default";
      
      @Override
      public IBinder onBind(Intent intent) {
          return new MyBinder();
      }
      
      @Override
      public void onCreate() {
          doing = true;
          new Thread(){
              int i =0;
              @Override
              public void run() {
                  while (doing) {
                      Log.v("service",data);
                      String string = i+":"+data;
                      i++;
                      if (callBack!=null) {
                          callBack.onDataChange(string);
                      }
                      try {
                          sleep(1000);
                      } catch (InterruptedException e) {
                          e.printStackTrace();
                      }
                  }
              };
          }.start();
          super.onCreate();
      }
      
      @Override
      public int onStartCommand(Intent intent, int flags, int startId) {
          data = intent.getStringExtra("data");
          return super.onStartCommand(intent, flags, startId);
      }
      
      @Override
      public void onDestroy() {
          doing = false;
          Log.v("service","服务停止");
          super.onDestroy();
      }
      
      
      
      private CallBack callBack = null;
      
      
      public class MyBinder extends android.os.Binder{
          public void Setdate(String data) {
              Myservice.this.data = data;
          }
          public void SetCallBack(CallBack callBack) {
              Myservice.this.callBack = callBack;
          }
      }
      
      public interface CallBack{
          public void onDataChange(String data);
      }
  }