Turning on wifi using WifiManager stops to work on Android 10

Question

I have following code which used to work well pre Android 10. But it is not able to turn wifi on in Android 10 devices.

WifiManager wifiMgr = (WifiManager) g         


        

Answer 1

I don't know where the problem is, as Google is answering it already:

If apps are targeting an older SDK ( Build.VERSION_CODES.P or below), they can continue to use this API.

So change your Target SDK to 28 and it works fine on Android Q.

Or if you need to change WiFi State by second Apps like Tasker or Automate:

1. Install Android Studio
2. Create a new Project namend WiFiOn with Empty Activity and SDK 28
3. Add commented lines:

import androidx.appcompat.app.AppCompatActivity;

import android.net.wifi.WifiManager;
import android.content.Context;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Add WiFi On Part
        WifiManager wifi = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
        wifi.setWifiEnabled(true); // true or false to activate/deactivate wifi


        // Add Toast if you want to
        Toast toast = Toast.makeText(getApplicationContext(), "WiFi on",  Toast.LENGTH_SHORT);
        toast.show();

        // Add Close Activity immediatelly
        finish();

    }
}

4. Change minSdkVersion and targetSdkVersion to 28 in build.grade(:app)

    compileSdkVersion 30
    buildToolsVersion "30.0.2"

    defaultConfig {
        applicationId "com.stackoverflow.example"
        minSdkVersion 28
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

5. Add Permission to AndroidMAnifest.xml

6. Use Android Studio to install it on your phone.

7. Create a new Project like in 3. and name it WiFiOff and repeat all steps with changed lines in MainActivity:

...
        wifi.setWifiEnabled(false); // true or false to activate/deactivate wifi
...
        Toast toast = Toast.makeText(getApplicationContext(), "WiFi off",  
...