如何为android开发创建后台服务

Question

嗨，我是android的新手，这也是我第一次使用后台工作的服务。我的意思是，我想构建一个语音命令应用程序，我想让它即使在关闭的时候也能听到用户的命令。我想要在任何用户按下“后退”按钮时启动我的服务。我将非常感谢你的大力帮助。

Answer 1

试试这个：

import android.app.Service;

导入android.content.Intent；导入android.os.IBinder；

公共类Startappservice扩展了服务{

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

@Override
public void onCreate() {
    // TODO Auto-generated method stub
    super.onCreate();
    Intent LaunchIntent = getPackageManager().getLaunchIntentForPackage("com.example.enwaye_connect.MainActivity");
    startActivity( LaunchIntent );
}

要在单击后退按钮时启动服务：

Intent start= new Intent(this, Startappservice .class);
        startService(start);

在您的清单中添加：

 <service android:name="your_package_name.Startappservice" >
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
            <action android:name="our_package_name.Startappservice" />
        </intent-filter>
    </service>

Answer 2

您必须使用Service类。创建一个派生自它的类，然后您就可以将您的方法添加到服务中。

public class MyService extends Service {

    // This is used to establish a communication with the service.
    public class LocalBinder extends Binder {
        LocalService getService() {
            return LocalService.this;
        }
    }


    // Called when the service is created
    @Override
    public void onCreate() {
       // YOUR CODE
    }

    // Called when the service is started
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // YOUR CODE
        return START_STICKY;
    }

    // called when the service instance is destroyed
    @Override
    public void onDestroy() {
         // YOUR CODE
    }

    // Returns the binder which is used for communication with the service.
    @Override
    public IBinder onBind(Intent intent) {
        return mBinder;
    }
}

要启动服务，请使用：

Intent start= new Intent(this, MyService.class);
startService(start);