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POWifi scanning Application keeping crashing without showing the main activity
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2013-04-19T11:56:10.607
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<p>I'm writing an application to scan for wireless network available but , when I run my application it crashes before even displaying the main activity. also I was looking for how to use the scan result but I'm not sure if the way I'm using it is correct . I read about the broadcast receiver but I didn't find any examples of how to use it . here is my code , Any help is really appreciated </p> <pre><code>package com.example.wizer2; import java.util.List; import android.net.wifi.ScanResult; import android.net.wifi.WifiInfo; import android.net.wifi.WifiManager; import android.os.Bundle; import android.app.Activity; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.view.Menu; import android.view.View; import android.widget.Button; import android.widget.TextView; public class Wizer extends Activity { WifiManager Wifi; BroadcastReceiver receiver; List<ScanResult> results; Button bt1; //Current status TextView t1; //for current status result @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_wizer); //GUI bt1=(Button)findViewById(R.id.b1); t1=(TextView)findViewById(R.id.t1); // to enable wifi service Wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE); bt1.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { WifiInfo info = Wifi.getConnectionInfo(); if (info.getBSSID()==null) { t1.setText("You are currently not connected to any wireless network.\n"); } else { t1.append("Current Status:\n"); t1.append("Network Name :"+info.getSSID().toString()+"\n"); t1.append("RSSI :"+info.getRssi()+"\n"); } } }); Wifi.startScan(); // Register Broadcast Receiver if (receiver == null) receiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { results =Wifi.getScanResults(); // Intent I1 =new Intent(); } }; registerReceiver(receiver, new IntentFilter( WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_wizer, menu); return true; } public void onStop() { unregisterReceiver(receiver); } </code></pre> <p>}</p>
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<android><android-wifi>
Title
Wifi scanning Application keeping crashing without showing the main activity
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