我正在尝试构建一个扫描可用wifi连接的应用程序,并在列表视图中列出它们。 用户可以选择一个并连接到wifi。 我的代码似乎不起作用。 我在清单中添加了以下权限:
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
以下是主要活动:
public class MainActivity extends ListActivity {
WifiManager mainWifiObj;
WifiScanReceiver wifiScanReceiver;
ListView list;
String wifiList[];
EditText pass;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list=getListView();
mainWifiObj = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
wifiScanReceiver = new WifiScanReceiver();
mainWifiObj.startScan();
// listening to single list item on click
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// selected item
String ssid = ((TextView) view).getText().toString();
connectToWifi(ssid);
Toast.makeText(MainActivity.this,"Wifi SSID : "+ssid,Toast.LENGTH_SHORT).show();
}
});
}
protected void onPause() {
unregisterReceiver(wifiScanReceiver);
super.onPause();
}
protected void onResume() {
registerReceiver(wifiScanReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
super.onResume();
}
class WifiScanReceiver extends BroadcastReceiver {
@SuppressLint("UseValueOf")
public void onReceive(Context c, Intent intent) {
List<ScanResult> wifiScanList = mainWifiObj.getScanResults();
wifiList = new String[wifiScanList.size()];
for(int i = 0; i < wifiScanList.size(); i++){
wifiList[i] = ((wifiScanList.get(i)).SSID);
}
String filtered[] = new String[wifiScanList.size()];
int counter = 0;
for (String eachWifi : wifiList) {
String[] temp = eachWifi.split(",");
filtered[counter] = temp[0].substring(5).trim();//+"\n" + temp[2].substring(12).trim()+"\n" +temp[3].substring(6).trim();//0->SSID, 2->Key Management 3-> Strength
counter++;
}
list.setAdapter(new ArrayAdapter<String>(getApplicationContext(),R.layout.list_item,R.id.label, filtered));
}
}
private void finallyConnect(String networkPass, String networkSSID) {
WifiConfiguration wifiConfig = new WifiConfiguration();
wifiConfig.SSID = String.format("\"%s\"", networkSSID);
wifiConfig.preSharedKey = String.format("\"%s\"", networkPass);
// remember id
int netId = mainWifiObj.addNetwork(wifiConfig);
mainWifiObj.disconnect();
mainWifiObj.enableNetwork(netId, true);
mainWifiObj.reconnect();
WifiConfiguration conf = new WifiConfiguration();
conf.SSID = "\"\"" + networkSSID + "\"\"";
conf.preSharedKey = "\"" + networkPass + "\"";
mainWifiObj.addNetwork(conf);
}
private void connectToWifi(final String wifiSSID) {
final Dialog dialog = new Dialog(this);
dialog.setContentView(R.layout.connect);
dialog.setTitle("Connect to Network");
TextView textSSID = (TextView) dialog.findViewById(R.id.textSSID1);
Button dialogButton = (Button) dialog.findViewById(R.id.okButton);
pass = (EditText) dialog.findViewById(R.id.textPassword);
textSSID.setText(wifiSSID);
// if button is clicked, connect to the network;
dialogButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String checkPassword = pass.getText().toString();
finallyConnect(checkPassword, wifiSSID);
dialog.dismiss();
}
});
dialog.show();
}
}
通过调试代码,我发现即使在调用getScanResults之后,wifilist也不包含单个值。 我甚至试图找到各种线程中显示的代码,似乎没有列出无线网络。 如何使这段代码有效?