android Wifi应用程序破解

我写了一个扫描wifi连接的android应用程序。android Wifi应用程序破解

我用下面的代码

package com.android.wifitester;

进口的java.util.List; import android.app.Activity; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.net.wifi.ScanResult; import android.net.wifi.WifiManager; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.widget.TextView;

public class WifiTester extends Activity { TextView mainText; WifiManager mainWifi; WifiReceiver receiverWifi; 列出wifiList; StringBuilder sb = new StringBuilder（）;

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    mainText = (TextView) findViewById(R.id.mainText); 
    mainWifi = (WifiManager) getSystemService(Context.WIFI_SERVICE); 

    receiverWifi = new WifiReceiver(); 
    registerReceiver(receiverWifi, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)); 
    mainWifi.startScan(); 
    mainText.setText("\nStarting Scan...\n"); 
} 

public boolean onCreateOptionsMenu(Menu menu) { 
    menu.add(0, 0, 0, "Refresh"); 
    return super.onCreateOptionsMenu(menu); 
} 

public boolean onMenuItemSelected(int featureId, MenuItem item) { 
    mainWifi.startScan(); 
    mainText.setText("Starting Scan"); 
    return super.onMenuItemSelected(featureId, item); 
} 

protected void onPause() { 
    unregisterReceiver(receiverWifi); 
    super.onPause(); 
} 

protected void onResume() { 
    registerReceiver(receiverWifi, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)); 
    super.onResume(); 
} 

class WifiReceiver extends BroadcastReceiver { 
    public void onReceive(Context c, Intent intent) { 
     sb = new StringBuilder(); 
     wifiList = mainWifi.getScanResults(); 
     for(int i = 0; i < wifiList.size(); i++){ 
      sb.append(new Integer(i+1).toString() + "."); 
      sb.append((wifiList.get(i)).toString()); 
      sb.append("\n"); 
     } 
     mainText.setText(sb); 
    } 
}

}

当我运行模拟器上的应用程序，它崩溃

清单文件是：

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

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

<uses-sdk android:minSdkVersion="8" />

我的问题是，为什么它崩溃了，虽然我加入了允许线

来源

2010-10-23 Omran

您需要发布时崩溃你得到的错误，所以我们知道什么是错的。 – 2010-10-23 18:01:14

简短的回答是：模拟器不做无线网络连接。

在仿真器中，和其它装置不带WiFi，线

wifiList = mainWifi.getScanResults();

将导致wifiList被空。你应该有这样的try/catch块围绕这一检查这一点，例如：

try{ 
    wifiList = mainWifi.getScanResults(); 
    for(int i = 0; i < wifiList.size(); i++){ 
     sb.append(new Integer(i+1).toString() + "."); 
     sb.append((wifiList.get(i)).toString()); 
     sb.append("\n"); 
    } 
catch (NullPointerException e) { 
    //Add dummy testdata to sb 
}

来源

2011-05-11 09:16:03 Dimse

android Wifi应用程序破解

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