菜鳥學步之Service通信（2）

上面講的内容都是從Activity裡傳資料給Service，那麼到底怎麼樣才能把Service的資料傳給Activity呢？這裡有一種方法：

Service實時向Activity傳遞資料案例

package com.ljq.activity;

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

public class CountService extends Service {
 private int count = ;
 private boolean threadDisable=false;

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

  new Thread(new Runnable() {
   @Override
   public void run() {
    while (!threadDisable) {
     try {
      Thread.sleep();
     } catch (InterruptedException e) {
      e.printStackTrace();
     }
     count++;
     Log.v("CountService", "Count is " + count);

     //發送廣播
     Intent intent=new Intent();//這裡又跟Activity對應起來了。
     intent.putExtra("count", count);
     intent.setAction("com.ljq.activity.CountService");
     sendBroadcast(intent);
    }
   }
  }).start();

 }

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

 @Override
 public void onDestroy() {
  super.onDestroy();
  count=;
  threadDisable = true;
  Log.v("CountService", "on destroy");
 }


}
           

然後在MainActivity裡面寫上

public class MainActivity extends Activity {
 private EditText editText=null;
 private MyReceiver receiver=null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        editText=(EditText)findViewById(R.id.editText);

        //啟動服務
        startService(new Intent(MainActivity.this, CountService.class));

  //注冊廣播接收器
  receiver=new MyReceiver();
  IntentFilter filter=new IntentFilter();
  filter.addAction("com.ljq.activity.CountService");
  MainActivity.this.registerReceiver(receiver,filter);
    }

    @Override
 protected void onDestroy() {
     //結束服務
        stopService(new Intent(MainActivity.this, CountService.class));
  super.onDestroy();  
 }

    /**
     * 擷取廣播資料
     * 
     * @author jiqinlin
     *
     */
    public class MyReceiver extends BroadcastReceiver {
     @Override
     public void onReceive(Context context, Intent intent) {
      Bundle bundle=intent.getExtras();
      int count=bundle.getInt("count");
      editText.setText(count+"");    
     }
    }




}
           

這裡是複制的其他人的，看起來是個簡潔的方法，但是我還沒有學到廣播呢

下面是我在學習過程中的代碼

public class MyService extends Service {
    String data;
    private  boolean running=false;
    public MyService() {
    }

    @Override
    public IBinder onBind(Intent intent) {
        return new Binder();
    }
    public class Binder extends android.os.Binder{
        public void setData(String data){

            MyService.this.data=data;
        }

        public MyService getService(){
            return  MyService.this;
        }
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        data=intent.getStringExtra("data");
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onCreate() {
        super.onCreate();
        running=true;
        new Thread(){
            @Override
            public void run() {
                super.run();
                int i=;
                while (running){
                    try {
                        sleep();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                   i++;
                    String str=i+":"+data;
                    System.out.println(str);
                    if (callback!=null){
                        callback.onDataChange(str);
                    }
                }
            }
        }.start();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        running=false;
    }
    private Callback callback=null;

    public void setCallback(Callback callback) {
        this.callback = callback;
    }

    public Callback getCallback() {
        return callback;
    }

    public  interface Callback{
        void onDataChange(String str);

    }
}
           

public class MainActivity extends AppCompatActivity implements View.OnClickListener, ServiceConnection {
    private EditText edit;
    private  EditText edit2;
    private MyService.Binder binder;
    private TextView text;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        edit=(EditText)findViewById(R.id.edit) ;
        findViewById(R.id.startService).setOnClickListener(this);
        findViewById(R.id.stopService).setOnClickListener(this);
        findViewById(R.id.BindService).setOnClickListener(this);
        findViewById(R.id.unBindService).setOnClickListener(this);
        findViewById(R.id.syscdata).setOnClickListener(this);
        edit2=(EditText)findViewById(R.id.edit2);
        text=(TextView) findViewById(R.id.textview);
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.startService:
                Intent intent=new Intent(this,MyService.class);
                intent.putExtra("data",edit.getText().toString());
                startService(intent);
                break;
            case R.id.stopService:
                stopService(new Intent(this,MyService.class));
                break;
            case R.id.BindService:
                bindService(new Intent(this,MyService.class),this, Context.BIND_AUTO_CREATE);
                break;
            case R.id.unBindService:
                unbindService(this);
                break;
            case R.id.syscdata:
                if (binder!=null){
                    binder.setData(edit2.getText().toString());
                }
                break;
        }
    }

    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        binder= (MyService.Binder) iBinder;
        binder.getService().setCallback(new MyService.Callback() {
            @Override
            public void onDataChange(String str) {
                Message msg=new Message();
                Bundle b=new Bundle();
                b.putString("data",str);
                msg.setData(b);
                handler.sendMessage(msg);

            }
        });
    }

    @Override
    public void onServiceDisconnected(ComponentName componentName) {

    }

    private Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            text.setText(msg.getData().getString("data"));
        }
    };
}
           

這一次為什麼這麼懶呢,直接把代碼貼過來，是因為我也不太了解，這一部分隻能照着敲一下代碼，再慢慢琢磨吧。