Android 6.0.1 couldn't enable wifi hotspot programmatically

问题

When I tried to enable wifi tethering from the following code it throws the exception

java.lang.reflect.InvocationTargetException at java.lang.reflect.Method.invoke(Native Method) at com.....

.... not granted this permission: android.permission.WRITE_SETTINGS

But this works fine in android 6.0 and below versions. And also tried with giving android.permission.WRITE_SETTINGS too.

Is there any limitation in accessing wifiAP in android 6.1?

Follow I attached the code sample that I used to enable hotspot.

            WifiConfiguration netConfig = new WifiConfiguration();
            netConfig.SSID = ssId;
            netConfig.preSharedKey = passkey;
            netConfig.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.SHARED);
            netConfig.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);

            try {
                boolean apstatus = (Boolean) method.invoke(wifiManager, netConfig, true);

                for (Method isWifiApEnabledmethod : wmMethods) {
                    if (isWifiApEnabledmethod.getName().equals("isWifiApEnabled")) {
                        while (!(Boolean) isWifiApEnabledmethod.invoke(wifiManager)) {}

                        for (Method method1 : wmMethods) {
                            if (method1.getName().equals("getWifiApState")) {
                                int apstate;
                                apstate = (Integer) method1.invoke(wifiManager);
                                Log.i(TAG, "Apstate ::: " + apstate);
                            }
                        }
                    }
                }

                if (apstatus) {
                    Log.d(TAG, "Access Point created");
                } else {
                    Log.d(TAG, "Access Point creation failed");
                }

            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            }

回答1:

I think Android M don't support to create hotspot programmatically . You can take your Marshmallow user to settings page to create hotspot by himself. below code will help yo to go setting page.

  startActivity(
    new Intent(Settings.ACTION_SETTINGS));

回答2:

This is not the correct way.But this fixed the issue.

Changed the target sdk version to 21. Then hotspot will start programmatically even in android 6.0.1. Think there should be a proper way to do this for android 6 and later versions. I think requesting runtime permissions needs to execute those kind of processess. This talks about the android permission requesting in runtime

回答3:

Set target SDK version 21 and ask for write_settings permission in your activity. Also add android.permission.WRITE_SETTINGS permission in manifest.

if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                Manifest.permission.WRITE_SETTINGS)){

}else {
    ActivityCompat.requestPermissions(this,
            new String[]{Manifest.permission.WRITE_SETTINGS},
            121);
}

For more details please visit http://developer.android.com/training/permissions/requesting.html

回答4:

Guys I tried everything and I wasn't able to start the hotspot in Android 6.0. You can just check if Api is >= 23, and if so just take the user to settings page to create hotspot by himself.

if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    final Intent intent = new Intent(Intent.ACTION_MAIN, null);
    intent.addCategory(Intent.CATEGORY_LAUNCHER);
    final ComponentName cn = new ComponentName(
                   "com.android.settings",
                   "com.android.settings.TetherSettings");
    intent.setComponent(cn);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity( intent);
}else{
   createhotSpot();
}

回答5:

Permission is not your problem. You need something like this code :

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (!Settings.System.canWrite(getApplicationContext())) {
    Intent intent = new Intent(Settings.ACTION_MANAGE_WRITE_SETTINGS, Uri.parse("package:" + getPackageName()));
    startActivityForResult(intent, 200); //You need a callback for activity result so that check if user enabled this feature, go for starting hotspot (google for it)
} else {
    // Do your stuff about starting hotspot (in network thread)
}

}

来源：https://stackoverflow.com/questions/34355580/android-6-0-1-couldnt-enable-wifi-hotspot-programmatically