My activity is crashing for a strange reason

Issue

I have this in my fragment xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/sphereIcon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/rsz_rsz_mystic" 
        android:contentDescription="@string/magicBallDescr"/>

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" >

<WebView
        android:id="@+id/webView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
    />


    </FrameLayout>

</LinearLayout>

and here is my onCreate method:

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

    WebView webview;

    webview = (WebView) findViewById(R.id.webView1);
    webview.setWebViewClient(new WebViewClient());
    webview.loadUrl("http://www.google.com");

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();
    }
}

Everything seems fine to me, but when I run the application it crashes with a lot of errors.

Here is the log:

04-26 07:27:22.818: E/AndroidRuntime(1834): FATAL EXCEPTION: main
04-26 07:27:22.818: E/AndroidRuntime(1834): Process: com.gelasoft.answeringball, PID: 1834
04-26 07:27:22.818: E/AndroidRuntime(1834): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.gelasoft.answeringball/com.gelasoft.answeringball.MainActivity}: java.lang.NullPointerException
04-26 07:27:22.818: E/AndroidRuntime(1834):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
04-26 07:27:22.818: E/AndroidRuntime(1834):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
04-26 07:27:22.818: E/AndroidRuntime(1834):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
04-26 07:27:22.818: E/AndroidRuntime(1834):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
04-26 07:27:22.818: E/AndroidRuntime(1834):     at android.os.Handler.dispatchMessage(Handler.java:102)
04-26 07:27:22.818: E/AndroidRuntime(1834):     at android.os.Looper.loop(Looper.java:136)
04-26 07:27:22.818: E/AndroidRuntime(1834):     at android.app.ActivityThread.main(ActivityThread.java:5017)
04-26 07:27:22.818: E/AndroidRuntime(1834):     at java.lang.reflect.Method.invokeNative(Native Method)
04-26 07:27:22.818: E/AndroidRuntime(1834):     at java.lang.reflect.Method.invoke(Method.java:515)
04-26 07:27:22.818: E/AndroidRuntime(1834):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-26 07:27:22.818: E/AndroidRuntime(1834):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-26 07:27:22.818: E/AndroidRuntime(1834):     at dalvik.system.NativeStart.main(Native Method)
04-26 07:27:22.818: E/AndroidRuntime(1834): Caused by: java.lang.NullPointerException
04-26 07:27:22.818: E/AndroidRuntime(1834):     at com.gelasoft.answeringball.MainActivity.onCreate(MainActivity.java:24)
04-26 07:27:22.818: E/AndroidRuntime(1834):     at android.app.Activity.performCreate(Activity.java:5231)
04-26 07:27:22.818: E/AndroidRuntime(1834):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
04-26 07:27:22.818: E/AndroidRuntime(1834):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
04-26 07:27:22.818: E/AndroidRuntime(1834):     ... 11 more

What am I missing here? I know that it is something really small, but I'm not able to find it.

Solution

Try this..

Do your WebView initialization and others codes inside PlaceholderFragment.java. Because WebView is in fragment.xml

Or

Change setContentView(R.layout.activity_main); to setContentView(R.layout.fragment); and remove

if (savedInstanceState == null) {
    getSupportFragmentManager().beginTransaction()
            .add(R.id.container, new PlaceholderFragment()).commit();
}

Answered By - Hariharan