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[英]Android: trouble in understanding wifi receiver and adapter concepts used to scan WiFi APs and list them in listview
[英]Android Application to scan wifi aps and display them in list view
我正在尝试制作一个简单的android应用程序,它扫描wifi aps并在列表视图中显示它们,包括SSID,BSSID和Signal Strength。
尽管这可能不是一件困难的任务,但是由于我对android开发非常陌生,所以我遇到了一个问题。
我编写了代码来完成这些基本任务。 但是,它不显示任何结果。 它也没有显示任何错误。 您能帮我修复它并使它正常工作吗?
public class MainActivity extends AppCompatActivity implements View.OnClickListener, CompoundButton.OnCheckedChangeListener{
// Declare View variables
private Button mRefreshButton;
private Switch mWifiSwitch;
private ListView mAPListView;
private List<ScanResult> mWifiList;
private List<String> mListOfProviders;
private ListAdapter mAdapter;
private WifiManager mWifiManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mListOfProviders = new ArrayList<String>();
mAPListView = (ListView) findViewById(R.id.APListView);
mRefreshButton = (Button) findViewById(R.id.refreshButton);
mWifiSwitch = (Switch) findViewById(R.id.WiFiSwitch);
mWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE);
boolean wasEnabled = mWifiManager.isWifiEnabled();
if (wasEnabled){
mWifiSwitch.setChecked(true);
}
mWifiSwitch.setOnCheckedChangeListener(this);
mWifiManager.startScan();
mWifiList = mWifiManager.getScanResults();
for (ScanResult result : mWifiList) {
mListOfProviders.add(result.SSID); //This will add the SSID of the connection
}
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, android.R.id.text1, mListOfProviders);
mAPListView.setAdapter(adapter);
}
@Override
public void onClick(View view)
{
}
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked){
mWifiManager.setWifiEnabled(true);
}
else {
mWifiManager.setWifiEnabled(false);
}
}
}
尝试将权限添加到清单中。
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
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