1
I’m trying to scan all Wi-Fi networks that the phone normally takes. My intention of this scan is to select and connect the desired network. I even followed Andriod’s own tutorial Wifi-Scan. But the problem is that it does not point out the error, and does not show the result.
That is to say on the line wifimanager.getResults(); result 0, the line is located in the method sucesso().
public class MainActivity extends AppCompatActivity {
public LinearLayout linearLayout =null;
public WifiManager wifiManager =null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
linearLayout = findViewById(R.id.layoutLinear);
wifiManager = ((WifiManager)getApplicationContext().getSystemService(Context.WIFI_SERVICE));
BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
Boolean sucess = intent.getBooleanExtra(WifiManager.EXTRA_RESULTS_UPDATED,false);
if(sucess)
{
sucesso();
}else{
old();
}
}
};
registerReceiver(broadcastReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
boolean success = wifiManager.startScan();
if (!success) {
// scan failure handling
inSucess();
}
}
public void sucesso()
{
List<ScanResult> results = wifiManager.getScanResults();
for (ScanResult scanResult:results) {
ImageView imageView = new ImageView(this);
imageView.setImageResource(R.drawable.baseline);
TextView textView = new TextView(this);
String text = scanResult.SSID;
textView.setText(text);
linearLayout.addView(imageView);
linearLayout.addView(textView);
}
TextView textView = new TextView(this);
textView.setText("sucesso");
linearLayout.addView(textView);
}
public void inSucess()
{
TextView textView = new TextView(this);
textView.setText("falha");
linearLayout.addView(textView);
}
public void old() {
TextView textView = new TextView(this);
textView.setText("old preview");
linearLayout.addView(textView);
}
}
Grateful to all.