Android 调用Remote Service方法

最新推荐文章于 2021-05-27 00:30:03 发布

win2k3net

最新推荐文章于 2021-05-27 00:30:03 发布

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分类专栏： Android 文章标签： service android button exception import null

本文链接：https://blog.youkuaiyun.com/win2k3net/article/details/7669760

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这篇博客介绍了如何在Android应用中使用AIDL实现远程调用Service的方法。通过创建AIDL文件定义接口，然后在Service和Activity中分别实现和服务连接，展示了启动、停止、绑定和解绑Service的操作，并在Service中更新计数器状态。

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《Android开发入门与实践》上的ex_TestServiceHolder例子在AndroidManifest.xml中

这是一个远程方法，是无法直接从Activity调用Service中的方法的。

根据网上的资料写了一个AIDL文件，实现了远程调用。在这里记录备忘。

package com.iceskysl.TestServiceHolder; 

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.os.RemoteException;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class TestServiceHolder extends Activity {
    private boolean _isBound;
    private ITestService _boundService = null;

    private static final String TAG = "TestServiceHolder";

    private IBinder _service;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        setTitle("Service Test");
        initButtons();

    }

    private ServiceConnection _connection = new ServiceConnection() {
        public void onServiceConnected(ComponentName className, IBinder service) {
            _boundService = ITestService.Stub.asInterface(service);
            Toast.makeText(TestServiceHolder.this, "Service connected",
                    Toast.LENGTH_SHORT).show();
            Log.e(TAG, "=====>onServiceConnected()");
        }

        public void onServiceDisconnected(ComponentName className) {
            // unexpectedly disconnected,we should never see this happen.
            _boundService = null;
            Toast.makeText(TestServiceHolder.this, "Service connected",
                    Toast.LENGTH_SHORT).show();
            Log.e(TAG, "<=====onServiceDisconnected()");
        }
    };

    private void initButtons() {
        Button buttonStart = (Button) findViewById(R.id.start_service);
        buttonStart.setOnClickListener(new OnClickListener() {
            public void onClick(View arg0) {
                startService();
            }
        });

        Button buttonStop = (Button) findViewById(R.id.stop_service);
        buttonStop.setOnClickListener(new OnClickListener() {
            public void onClick(View arg0) {
                stopService();
            }
        });

        Button buttonBind = (Button) findViewById(R.id.bind_service);
        buttonBind.setOnClickListener(new OnClickListener() {
            public void onClick(View arg0) {
                bindService();
            }
        });

        Button buttonUnbind = (Button) findViewById(R.id.unbind_service);
        buttonUnbind.setOnClickListener(new OnClickListener() {
            public void onClick(View arg0) {
                unbindService();
            }
        });
    }

    private void startService() {
        Intent i = new Intent(this, TestService.class);
        this.startService(i);
    }

    private void stopService() {
        Intent i = new Intent(this, TestService.class);
        this.stopService(i);
    }

    private void bindService() {
        Intent i = new Intent(this, TestService.class);
        bindService(i, _connection, Context.BIND_AUTO_CREATE);
        _isBound = true;

    }

    private void unbindService() {
        if (_boundService != null) {
            try {
                Log.e(TAG,"_boundService.getCount() = "+ _boundService.getCount());
            } catch (RemoteException e) {
                e.printStackTrace();
            }
        }

        if (_isBound) {
            unbindService(_connection);
            _isBound = false;
        }
    }
}

===============================================================

package com.iceskysl.TestServiceHolder; 

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.RemoteException;
import android.util.Log;

public class TestService extends Service {

    private static final String TAG = "TestService";
    private NotificationManager _nm;
    private boolean threadEnable = true;
    private int i = 0;

    private ITestService.Stub serviceBinder = new ITestService.Stub() {
        @Override
        public int getCount() throws RemoteException {
            // TODO Auto-generated method stub
            return i;
        }
    };

    @Override
    public IBinder onBind(Intent i) {
        Log.e(TAG, "============> TestService.onBind");
        return serviceBinder;
    }

    @Override
    public boolean onUnbind(Intent i) {
        Log.e(TAG, "============> TestService.onUnbind");
        return false;
    }

    @Override
    public void onRebind(Intent i) {
        Log.e(TAG, "============> TestService.onRebind");
    }

    @Override
    public void onCreate() {
        Log.e(TAG, "============> TestService.onCreate");
        _nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        showNotification();

        new Thread() {
            public void run() {
                try {
                    while (threadEnable) {
                        sleep(1000);
                        Log.d(TAG, "Count = " + (++i));
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

            }
        }.start();
    }

    @Override
    public void onStart(Intent intent, int startId) {
        Log.e(TAG, "============> TestService.onStart");
    }

    @Override
    public void onDestroy() {
        _nm.cancel(R.string.service_started);
        threadEnable = false;
        Log.e(TAG, "============> TestService.onDestroy");
    }

    private void showNotification() {
        Notification notification = new Notification(R.drawable.face_1,
                "Service started", System.currentTimeMillis());
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
                new Intent(this, TestServiceHolder.class), 0);
        // must set this for content view, or will throw a exception
        notification.setLatestEventInfo(this, "Test Service",
                "Service started", contentIntent);

        _nm.notify(R.string.service_started, notification);
    }

    public int getCount() {
        return i;
    }

}

=======================================

ITestService.aidl

 


package com.iceskysl.TestServiceHolder; 

interface ITestService
{
    int getCount();
}

========================================