App force closes after opening WiFi settings

Question

I want my app to open WiFi settings on button click but when I do so, it force closes. This is my code:

public class Settings extends Activity {

    private static Intent ACTION_WIFI_SETTINGS;

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

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.settings, menu);
        return true;
    }

    public void click(View view) { 
        Intent intent = new Intent(Settings.ACTION_WIFI_SETTINGS);  
        startActivity(intent);
    }
}

The XML Layout:

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".Settings" >

    <RadioGroup
        android:id="@+id/radioGroup1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="14dp" >
    </RadioGroup>

    <RadioButton
        android:id="@+id/radio0"
        android:onClick="togglewifi"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:checked="true"
        android:text="Toggle Wifi" />

    <RadioButton
        android:id="@+id/radio1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/radio0"
        android:text="Toggle Data" />

    <Button
        android:onClick="click"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/radio1"
        android:layout_below="@+id/radio1"
        android:layout_marginTop="16dp"
        android:text="Configure" />

     <Button
        android:id="@+id/button2"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:text="Done" />

     </RelativeLayout>

LogCat:

12-22 12:29:36.429: E/AndroidRuntime(2813): FATAL EXCEPTION: main
12-22 12:29:36.429: E/AndroidRuntime(2813): java.lang.IllegalStateException: Could not execute method of the activity
12-22 12:29:36.429: E/AndroidRuntime(2813):     at     android.view.View$1.onClick(View.java:2144)
12-22 12:29:36.429: E/AndroidRuntime(2813):     at android.view.View.performClick(View.java:2485)
12-22 12:29:36.429: E/AndroidRuntime(2813):     at android.view.View$PerformClick.run(View.java:9080)
12-22 12:29:36.429: E/AndroidRuntime(2813):     at android.os.Handler.handleCallback(Handler.java:587)
12-22 12:29:36.429: E/AndroidRuntime(2813):     at android.os.Handler.dispatchMessage(Handler.java:92)

How can I fix this?

Check permission in android AndroidManifest.xml and also post log error. — Md Abdul Gafur, Dec 22 '13 at 06:54
see http://stackoverflow.com/questions/2318310/how-can-i-call-wi-fi-settings-screen-from-my-application-using-android — Shayan Pourvatan, Dec 22 '13 at 07:12
if i remove it it says it cannot be initialized please fix my code — Anonymous, Dec 22 '13 at 07:45
Why aren't you using `android.provider.Settings.ACTION_WIFI_SETTINGS` ? — Michael, Dec 22 '13 at 08:09
And what is the need to create radio group? you are not grouping any buttons in it. — Kanwaljit Singh, Dec 22 '13 at 09:30

score 1 · Answer 1 · answered Dec 22 '13 at 07:27

1

You do realize that you are setting the Intent action to null. When you execute your click method it would of course get an NPE. Fix that.

answered Dec 22 '13 at 07:27

JoxTraex

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laalto · Answer 2 · 2013-12-22T08:39:00.530

0

In your XML, you declare an onClick callback on the RadioButton radio0:

android:onClick="togglewifi"

but your Activity does not have a method public void togglewifi(View), causing the exception:

java.lang.IllegalStateException: Could not execute method of the activity
     at     android.view.View$1.onClick(View.java:2144)

edited Dec 22 '13 at 08:39

answered Dec 22 '13 at 08:27

laalto

150,114
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@Anonymous Yes and the activity has no method for `togglewifi` – laalto Dec 22 '13 at 08:30
in class file -"click" – Anonymous Dec 22 '13 at 08:31
in xml in radio button you are using android:onClick="togglewifi". but you are not implementing wifi method in your activity. – Kanwaljit Singh Dec 22 '13 at 08:33
android:onClick="click" check button first then talk – Anonymous Dec 22 '13 at 09:39
Yes there's that and there's also `android:onClick="togglewifi"`. I copy-pasted it from your question. – laalto Dec 22 '13 at 09:45

App force closes after opening WiFi settings

2 Answers2