Android 呼叫服务中的问题

这是我的服务课

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

    public class Communicationservice extends Service {

        @Override
        public IBinder onBind(Intent intent) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public void onCreate() {
            super.onCreate();
            Log.d("I AM Service","Service Created");
        }

        @Override
        public void onStart(Intent intent, int startId) {
            // TODO Auto-generated method stub
            super.onStart(intent, startId);
        }

    }

Here is my Main Activity


import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;

public class MainActivity extends Activity {

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


        Log.d("flow","1");
        Intent in = new Intent("com.yal.Communication.Communicationservice");
        this.startService(in);
        //startService(new Intent(MainActivity.this,Communicationservice.class));
        Log.d("flow","2");
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}

下面是Mainfest.xml

<application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <activity > ...  </activity>
        <service android:enabled="true" android:name="com.yal.Communication.Communicationservice"></service>
    </application>

---

您需要检查意图过滤器

下面的代码片段将帮助您

<service android:name="com.yal.Communication.Communicationservice">
    <intent-filter>
        <action android:name="com.yal.Communication.Communicationservice" />
    </intent-filter>
</service>

---

构造函数

公共意图（字符串操作）

只能用于指定操作请参见以下java文档：

public Intent (String action)

Create an intent with a given action. All other fields (data, type, class) are null. Note that the action must be in a namespace because Intents are used globally in the system -- for example the system VIEW action is android.intent.action.VIEW; an application's custom action would be something like com.google.app.myapp.CUSTOM_ACTION.

Parameters
action  The Intent action, such as ACTION_VIEW.

对您的创建意图进行以下更改：

Intent in = new Intent(this,com.yal.Communication.Communicationservice.class);

或在me清单文件中指定操作：

<service android:name="com.yal.Communication.Communicationservice">
    <intent-filter>
        <action android:name="com.yal.Communication.Communicationservice" />
    </intent-filter>
</service>

您确定com.yal.Communication中有通信服务吗？因为其他的东西看起来很好。谢谢，它起作用了。。为什么我需要添加意图过滤器？意图过滤器是一种机制，您可以通过它指定在特定操作中应调用哪些活动/服务/广播接收器。

Intent in = new Intent(this,com.yal.Communication.Communicationservice.class);

<service android:name="com.yal.Communication.Communicationservice">
    <intent-filter>
        <action android:name="com.yal.Communication.Communicationservice" />
    </intent-filter>
</service>