CODEWITHSUNDEEP
androidandroid-service
Mohammad H
Mohammad H

Reputation: 805

How to make a service to check wifi state?

I am trying to make an app to lunch my main activity when wifi turns on. I found I should use a service to perform it. I found this code but does not work.

import android.app.IntentService;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.wifi.WifiManager;
import android.widget.Toast;

public class MyServer extends IntentService {
    public Boolean has_launched = false;
    public MyServer() {
        super("MyServer");
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Toast.makeText(MyServer.this, "service started", Toast.LENGTH_SHORT).show();
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        wificheck();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return android.app.Service.START_STICKY;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Toast.makeText(MyServer.this, "service stoped!", Toast.LENGTH_SHORT).show();
    }

    public void wificheck() {
        WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
        if (wifi.isWifiEnabled() && has_launched == false) {
            has_launched = true;
            //startActivity(new Intent(MyServer.this, MainActivity.class));
            Toast.makeText(MyServer.this, "Wifi is on!", Toast.LENGTH_SHORT).show();
        }
        else if (wifi.isWifiEnabled() == false) {
            has_launched = false;
        }
    }
}

I have permission to read wifi state and the app lunch normally(without an error) It does not lunch wificheck. what should I do?

Upvotes: 1

Views: 996

Answers (2)

osayilgan
osayilgan

Reputation: 5893

As far as I remember, in Google I/O 2014, they introduced the new kind of Wifi State listener in OS level. So it's way more efficient in terms of battery life.

I don't remember which session it was. but either It is in "Key Note" or in "What's new in Android" video. You can check it out on YouTube.

I will update my answer when I come across this api.

EDIT :

I've found it. It's called JobScheduler. I'm not sure if it's all you need but worth to give it a try.

Upvotes: 1

App Kart
App Kart

Reputation: 926

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.widget.TextView;

public class AndroidWifiStateChangedDetect extends Activity {

TextView WifiState;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      WifiState = (TextView)findViewById(R.id.wifistate);

      this.registerReceiver(this.WifiStateChangedReceiver,
              new IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION));
  }

  private BroadcastReceiver WifiStateChangedReceiver
  = new BroadcastReceiver(){

 @Override
 public void onReceive(Context context, Intent intent) {
  // TODO Auto-generated method stub

  int extraWifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE ,
    WifiManager.WIFI_STATE_UNKNOWN);

  switch(extraWifiState){
  case WifiManager.WIFI_STATE_DISABLED:
   WifiState.setText("WIFI STATE DISABLED");
   break;
  case WifiManager.WIFI_STATE_DISABLING:
   WifiState.setText("WIFI STATE DISABLING");
   break;
  case WifiManager.WIFI_STATE_ENABLED:
   WifiState.setText("WIFI STATE ENABLED");
   break;
  case WifiManager.WIFI_STATE_ENABLING:
   WifiState.setText("WIFI STATE ENABLING");
   break;
  case WifiManager.WIFI_STATE_UNKNOWN:
   WifiState.setText("WIFI STATE UNKNOWN");
   break;
  }

 }};
}

To detect Android Wifi ON/OFF (Enable/Disable) state, we can implement a BroadcastReceiver to register with the intent WifiManager.WIFI_STATE_CHANGED_ACTION. IN the BroadcastReceiver, the Wifi state can be retrieved using the code intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_UNKNOWN)

Upvotes: 1

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