안드로이드개발 wifi통신 예제소스

WiFiDemo.java

Code:

package com.example;

import java.util.List;


import android.app.Activity;


import android.content.BroadcastReceiver;


import android.content.Context;


import android.content.IntentFilter;


import android.net.wifi.WifiConfiguration;


import android.net.wifi.WifiInfo;


import android.net.wifi.WifiManager;


import android.os.Bundle;


import android.util.Log;


import android.view.View;


import android.view.View.OnClickListener;


import android.widget.Button;


import android.widget.TextView;


import android.widget.Toast;


public class WiFiDemo extends Activity implements OnClickListener {


	private static final String TAG = "WiFiDemo";


	WifiManager wifi;


	BroadcastReceiver receiver;


	TextView textStatus;


	Button buttonScan;


	/** Called when the activity is first created. */

	@Override


	public void onCreate(Bundle savedInstanceState) {


		super.onCreate(savedInstanceState);


		setContentView(R.layout.main);

		// Setup UI


		textStatus = (TextView) findViewById(R.id.textStatus);


		buttonScan = (Button) findViewById(R.id.buttonScan);


		buttonScan.setOnClickListener(this);





		// Setup WiFi


		wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);





		// Get WiFi status


		WifiInfo info = wifi.getConnectionInfo();


		textStatus.append("\n\nWiFi Status: " + info.toString());



		// List available networks


		List<WifiConfiguration> configs = wifi.getConfiguredNetworks();


		for (WifiConfiguration config : configs) {


			textStatus.append("\n\n" + config.toString());


		}



		// Register Broadcast Receiver


		if (receiver == null)


			receiver = new WiFiScanReceiver(this);


		registerReceiver(receiver, new IntentFilter(


				WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));


		Log.d(TAG, "onCreate()");


	}


	@Override


	public void onStop() {


		unregisterReceiver(receiver);


	}


	public void onClick(View view) {


		Toast.makeText(this, "On Click Clicked. Toast to that!!!",


				Toast.LENGTH_LONG).show();


		if (view.getId() == R.id.buttonScan) {


			Log.d(TAG, "onClick() wifi.startScan()");


			wifi.startScan();


		}


	}


}

The WiFiScanReceiver is registered by WiFiDemo as a broadcast receiver to be invoked by the system when new WiFi scan results are available. WiFiScanReceiver gets the callback via onReceive(). It gets the new scan result from the intent that activated it and compares it to the best known signal provider. It then outputs the new best network via a Toast.

WiFiScanReceiver.java

Code:

package com.example;


import java.util.List;


import android.content.BroadcastReceiver;


import android.content.Context;


import android.content.Intent;


import android.net.wifi.ScanResult;


import android.net.wifi.WifiManager;


import android.util.Log;


import android.widget.Toast;


public class WiFiScanReceiver extends BroadcastReceiver {


  private static final String TAG = "WiFiScanReceiver";


  WiFiDemo wifiDemo;

  public WiFiScanReceiver(WiFiDemo wifiDemo) {


    super();


    this.wifiDemo = wifiDemo;


  }

  @Override


  public void onReceive(Context c, Intent intent) {


    List<ScanResult> results = wifiDemo.wifi.getScanResults();


    ScanResult bestSignal = null;


    for (ScanResult result : results) {


      if (bestSignal == null


          || WifiManager.compareSignalLevel(bestSignal.level, result.level) < 0)


        bestSignal = result;


    }
    String message = String.format("%s networks found. %s is the strongest.",


        results.size(), bestSignal.SSID);


    Toast.makeText(wifiDemo, message, Toast.LENGTH_LONG).show();


    Log.d(TAG, "onReceive() message: " + message);


  }


}

The layout file for this example is fairly simple. It has one TextView wrapped in a ScrollView for scrolling purposes.

/res/layout/main.xml

Code:

<?xml version="1.0" encoding="utf-8"?>


<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"


  android:orientation="vertical" android:layout_width="fill_parent"


  android:layout_height="fill_parent">


  <Button android:layout_width="wrap_content"


    android:layout_height="wrap_content" android:id="@+id/buttonScan"


    android:text="Scan"></Button>


  <ScrollView android:id="@+id/ScrollView01"


    android:layout_width="wrap_content" android:layout_height="wrap_content">


    <TextView android:layout_width="fill_parent"


      android:layout_height="wrap_content" android:id="@+id/textStatus"


      android:text="WiFiDemo" />


  </ScrollView>


</LinearLayout>

 For the AndroidManifest.xml file, just remember to add the permissions to use WiFi:

Code:

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />


  <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />

The final application looks like this:

출처 : http://www.androidside.com/B46/11580

이드 - http://www.androidside.com/B46/11580