Activity綁定本地Service

服務客戶端(Activity)：

import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

    private final String TAG = "ActivityBindLocalService";
    private LocalService mLocalService;
    private boolean mIsBound;

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

        Button bindLocalService = (Button) findViewById(R.id.bind_local_service);
        bindLocalService.setOnClickListener(bindClickListener);
        Button unBindLocalService = (Button) findViewById(R.id.unBind_local_service);
        unBindLocalService.setOnClickListener(unBindOnClickListener);

    }

    private final OnClickListener bindClickListener = new OnClickListener() {

        @Override
        public void onClick(View v) {
            doBindService();
        }
    };

    private final OnClickListener unBindOnClickListener = new OnClickListener() {

        @Override
        public void onClick(View v) {
            doUnBindService();
        }
    };

    private void doBindService(){
        //將此Activity和LocalService綁定，然後會執行ServiceConnection裏面的onServiceConnected
        Log.i(TAG, "MainActivity ----> bindService");
        bindService(new Intent(MainActivity.this, LocalService.class),
                mServiceConnection, Context.BIND_AUTO_CREATE);
        mIsBound = true;
    }

    private void doUnBindService(){
        if (mIsBound) {
            //將此Activity和LocalService解除綁定，會直接執行LocalService的onDestory方法,將此Service銷燬
            unbindService(mServiceConnection);
            mIsBound = false;
        }
    }

    private final ServiceConnection mServiceConnection = new ServiceConnection() {

        @Override
        public void onServiceDisconnected(ComponentName name) {
            mLocalService = null;
            Toast.makeText(MainActivity.this,
                    "Disconnected from local service, 只有在異常的情況纔會調用onServiceDisonnected方法",
                    Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            //獲得LocalService實例，注意：此時僅僅是將Activity和LocalService綁定起來了，但並沒有啓動Service
            //如果要啓動LocalService，
            //只需要執行mLocalService.startService(new Intent(MainActivity.this, LocalService.class));
            Log.i(TAG, "MainActivity ----> onServiceConnected");
            mLocalService = ((LocalService.LocalBinder)service).getLocalService();
            Toast.makeText(MainActivity.this, "Connected to local service", Toast.LENGTH_SHORT).show();
        }
    };

    /**
     * 此方法用於初始化菜單，其中menu參數就是即將要顯示的Menu實例。
     * 返回true則顯示該menu,false 則不顯示;
     * (只會在第一次初始化菜單時調用)
     */
    @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;
    }

}

本地服務類(Service)：

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

public class LocalService extends Service {

    private final String TAG = "ActivityBindLocalService";
    private final IBinder mBinder = new LocalBinder();

    /**
     * 返回LocalBinder對象
     */
    @Override
    public IBinder onBind(Intent intent) {
        Log.i(TAG, "LocalService ----> LocalService onBind");
        return mBinder;
    }

    /**
     * 創建一個內部類用來返回LocalService實例
     * @author Simon Xu
     *
     * 2013-4-10下午2:34:33
     */
    public class LocalBinder extends Binder{
        LocalService getLocalService(){
            Log.i(TAG, "localService ----> return LocalService");
            return LocalService.this;
        }
    }

    @Override
    public void onCreate() {
        Log.i(TAG, "LocalService----> LocalService onCreate");
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.i(TAG, "LocalService----> LocalService onStartCommand");
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        Log.i(TAG, "LocalService----> LocalService onDestroy");
        super.onDestroy();
    }

}

 

（此圖來源於<<Android框架揭祕>>一書）