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在Android平台上启动服务

android-service android

mudit · 技术社区 · 16 年前

我正在使用 StartService(意图) 方法。当我调用此函数时,它达到 创建时的回调函数 服务,但无法呼叫 OnStand命令 . 这是我的密码--

@Override
public void onReceive(Context context, Intent intent) {
    // Send a text notification to the screen.
    Log.e("mudit", "Action: " + intent.getAction());

    try {
        ConnectivityManager connManager = (ConnectivityManager) context
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo info = connManager.getActiveNetworkInfo();
        Log.e("mudit", "getType: " + info.getType());
        Log.e("mudit", "isConnected: " + info.isConnected());
        if (info.isConnected()) {

            Intent newinIntent = new Intent(context, service.class);
            context.startService(newinIntent);
        }

    } catch (Exception e) {
        e.printStackTrace();
        Intent newinIntent = new Intent(context, service.class);
        context.stopService(newinIntent);

    }

}

服务代码

package com.android.service;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.widget.Toast;

public class service extends Service {

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Toast.makeText(this, "Service created...", Toast.LENGTH_LONG).show();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Toast.makeText(this, "Service destroyed ...", Toast.LENGTH_LONG).show();
    }

    public int onStartCommand(Intent intent, int flags, int startId) {

        Toast.makeText(this, "onStartCommand...", Toast.LENGTH_LONG).show();
        return 1;
    }

}

XML

<receiver class=".AReceiver" android:name=".AReceiver">
        <intent-filter>
            <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
        </intent-filter>
    </receiver>
    <service class=".service" android:name=".service"
        android:enabled="true" android:icon="@drawable/icon">
    </service>

5 回复 | 直到 11 年前

tony gil 14 年前

in this excellent post

    <receiver android:name=".ConnMonitor" android:enabled="true">
        <intent-filter>
            <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
        </intent-filter>
    </receiver>
    <service android:name=".BatchUploadGpsData" ></service>

</application>

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.util.Log;

public class ConnMonitor extends BroadcastReceiver {
    private String TAG = "TGtracker";

    @Override
    public void onReceive(Context context, Intent intent) {
        //String typeName = "";
        String state = "";
        int type = -1;
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService( Context.CONNECTIVITY_SERVICE );
        NetworkInfo test = (NetworkInfo) connectivityManager.getActiveNetworkInfo();
        //Log.v(TAG,"there has been a CONNECTION CHANGE -> "+intent.getExtras().get(ConnectivityManager.EXTRA_NETWORK_INFO));
        try {
            //typeName = test.getTypeName().toString();
            type = test.getType();
            state = test.getState().toString();
            //Log.i(TAG,"type -> '"+typeName +"'  state -> '"+state+"'"   );
        } catch (Exception e) {
            //typeName = "null";
            type = -1;
            state = "DISCONNECTED";
            //Log.i(TAG,"type -> error1 "+e.getMessage()+ "   cause = "+e.getCause()   );
        }

        if ( (type == 1)  &&  (state == "CONNECTED") ) {
            //Log.i(TAG, "I am soooo friggin uploadin on this beautiful WIFI connection ");
            Intent batchUploadDataService = new Intent(context, BatchUploadGpsData.class);
            context.startService(batchUploadDataService);
        } else {
            //Log.e(TAG,"NO FOUND MATCH type -> '"+typeName +"'  state -> '"+state+"'"   );
        }
    }
}

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

public class BatchUploadGpsData extends Service {
    final String TAG = "TGtracker";

    @Override
    public void onCreate() {
        Log.e(TAG, "here i am, rockin like a hurricane.   onCreate service");
    // this service tries to upload and terminates itself whether it is successful or not 
    // but it only effectively DOES anything while it is created 
    // (therefore, you can call 1 million times if uploading isnt done, nothing happens)
    // if you comment this next line, you will be able to see that it executes onCreate only the first it is called
    // the reason i do this is that the broadcast receiver is called at least twice every time you have a new change of connectivity state with successful connection to wifi
        this.stopSelf();
    }
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        //Log.i(TAG, "Received start id " + startId + ": " + intent);
        Log.e(TAG, "call me redundant BABY!  onStartCommand service");
        // this service is NOT supposed to execute anything when it is called
        // because it may be called inumerous times in repetition
        // all of its action is in the onCreate - so as to force it to happen ONLY once
        return 1;
    }
    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }

}

Anthony Hatzopoulos 13 年前

startService() stopService() bindService()

onCreate() onStartCommand

Source

Jimmy 15 年前

@Override onStartCommand(..)

JaydeepW 14 年前

public int onStartCommand(Intent intent, int flags, int startId) {

/*    Toast.makeText(this, "onStartCommand...", Toast.LENGTH_LONG).show();
    return 1; */

    Log.i("YourService", "Yes this works.");
}

JPM 14 年前

<service android:name="com.public.service.UploaderService" android:icon="@drawable/vgbio"></service>

package com.public.service;
....
public class UploaderService extends Service{
....
}