代码：
public class MainActivity extends AppCompatActivity {
String Tag = "MainActivity";
final int PERMISSION_REQUEST_CODE = 1;
String [] permission = new String[]{Manifest.permission.ACCESS_FINE_LOCATION};
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
if (Build.VERSION.SDK_INT>Build.VERSION_CODES.O){
if (!hasPermissionsGranted(permission)) {
ActivityCompat.requestPermissions(this,permission , PERMISSION_REQUEST_CODE);
}
}
WifiManager wifiManager = getSystemService(WifiManager.class);
boolean b = wifiManager.startScan();
Log.e("longjiang", "wifiManager.startScan " + b);
for (ScanResult scanResult : wifiManager.getScanResults()) {
Log.e("longjiang", scanResult.toString());
}
}
public boolean hasPermissionsGranted(@NonNull String[] permissions) {
for (String permission : permissions) {
if (ActivityCompat.checkSelfPermission(this, permission)
!= PackageManager.PERMISSION_GRANTED) {
return false;
//此时没有授权，返回false
}
}
return true;
//已经授权过，返回true
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
Log.d(Tag,"-------onRequestPermissionsResult--------");
if (requestCode == PERMISSION_REQUEST_CODE) {
if (!hasPermissionsGranted(permissions)) {//返回false代表申请失败
Toast.makeText(this, "授权失败", Toast.LENGTH_SHORT).show();
this.finish();
}else {
Toast.makeText(this, "授权成功", Toast.LENGTH_SHORT).show();
}
} else {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
}
权限：
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
标签：Toast,String,permission,WiFi,扫描,PERMISSION,wifiManager,Android,permissions From： https://www.cnblogs.com/wanglongjiang/p/17651935.html