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POAndroid Intent Button NullPointerException
 

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    <p>I'm trying have a button start another class. I get a null pointer exception which I found using logcat and I don't know why.</p> <pre class="lang-java prettyprint-override"><code> package com.Juggle2; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.widget.Button; public class Juggle2 extends Activity { public static final String LOG_TAG = "Juggle2"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.main); Button StartGameButton = (Button) findViewById(R.id.StartGame); StartGameButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { Intent i = new Intent(Juggle2.this, StartGame.class); startActivity(i); } }); </code></pre> <p>And my XML manifest:</p> <pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.Juggle2" android:versionCode="1" android:versionName="1.0"&gt; &lt;uses-sdk android:minSdkVersion="10" /&gt; &lt;application android:icon="@drawable/icon" android:label="@string/app_name"&gt; &lt;activity android:name=".Juggle2" android:label="@string/app_name"&gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;activity android:name=".Panel"&gt;&lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p>Here is the log </p> <pre><code> 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): FATAL EXCEPTION: main 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.Juggle2/com.Juggle2.Juggle2}: java.lang.NullPointerException 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1736) 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1752) 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): at android.app.ActivityThread.access$1500(ActivityThread.java:123) 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:993) 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): at android.os.Handler.dispatchMessage(Handler.java:99) 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): at android.os.Looper.loop(Looper.java:126) 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): at android.app.ActivityThread.main(ActivityThread.java:3997) 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): at java.lang.reflect.Method.invokeNative(Native Method) 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): at java.lang.reflect.Method.invoke(Method.java:491) 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841) 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): at dalvik.system.NativeStart.main(Native Method) 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): Caused by: java.lang.NullPointerException 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): at com.Juggle2.Juggle2.onCreate(Juggle2.java:24) 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048) 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1700) 05-27 21:12:07.749: ERROR/AndroidRuntime(6705): ... 11 more </code></pre> <p>And inside the main.xml:</p> <p>There is this button</p> <pre><code>&lt;Button android:id="@+id/StartGame" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/startgame_button" &gt; </code></pre>
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    1. COhow does the exception look, and which line does it refer to?
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    2. COCan you please post that logcat?
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    3. COThe exception here is important but without more information, I would speculate that there's a problem in your Panel.class's onCreate().
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