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POmy app crashes before it starts.This is a simple app in which i am making the use of intent to call another class from a previous class
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  1. POmy app crashes before it starts.This is a simple app in which i am making the use of intent to call another class from a previous class
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    copied!<p>intentTest.java:</p> <pre><code> package intentTest.xyz.com; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; public class intentTest extends Activity { Button b; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); b = (Button) findViewById(R.id.b); b.setOnClickListener( new View.OnClickListener() { public void onClick(View view) { Intent intent = new Intent(intentTest.this,seond.class ); startActivity(intent); } }); } } </code></pre> <p>main.xml:</p> <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" &gt; &lt;TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="First screen" /&gt; &lt;Button android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="click" android:name="@+id/b" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>seond.java:</p> <pre><code>package intentTest.xyz.com; import android.app.Activity; import android.os.Bundle; public class seond extends Activity{ /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.second); } } </code></pre> <p>second.xml:</p> <pre><code> &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content"&gt; &lt;TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="second screen" /&gt; </code></pre> <p></p> <p>manifest.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="intentTest.xyz.com" android:versionCode="1" android:versionName="1.0"&gt; &lt;application android:icon="@drawable/icon" android:label="@string/app_name"&gt; &lt;activity android:name=".intentTest" 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=".seond"&gt;&lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p>i get the following error code:</p> <pre><code>11-16 01:26:07.156: ERROR/AndroidRuntime(779): Uncaught handler: thread main exiting due to uncaught exception 11-16 01:26:07.166: ERROR/AndroidRuntime(779): java.lang.RuntimeException: Unable to start activity ComponentInfo{intentTest.xyz.com/intentTest.xyz.com.intentTest}: java.lang.NullPointerException 11-16 01:26:07.166: ERROR/AndroidRuntime(779): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401) 11-16 01:26:07.166: ERROR/AndroidRuntime(779): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417) 11-16 01:26:07.166: ERROR/AndroidRuntime(779): at android.app.ActivityThread.access$2100(ActivityThread.java:116) 11-16 01:26:07.166: ERROR/AndroidRuntime(779): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794) 11-16 01:26:07.166: ERROR/AndroidRuntime(779): at android.os.Handler.dispatchMessage(Handler.java:99) 11-16 01:26:07.166: ERROR/AndroidRuntime(779): at android.os.Looper.loop(Looper.java:123) 11-16 01:26:07.166: ERROR/AndroidRuntime(779): at android.app.ActivityThread.main(ActivityThread.java:4203) 11-16 01:26:07.166: ERROR/AndroidRuntime(779): at java.lang.reflect.Method.invokeNative(Native Method) 11-16 01:26:07.166: ERROR/AndroidRuntime(779): at java.lang.reflect.Method.invoke(Method.java:521) 11-16 01:26:07.166: ERROR/AndroidRuntime(779): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 11-16 01:26:07.166: ERROR/AndroidRuntime(779): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 11-16 01:26:07.166: ERROR/AndroidRuntime(779): at dalvik.system.NativeStart.main(Native Method) 11-16 01:26:07.166: ERROR/AndroidRuntime(779): Caused by: java.lang.NullPointerException 11-16 01:26:07.166: ERROR/AndroidRuntime(779): at intentTest.xyz.com.intentTest.onCreate(intentTest.java:18) 11-16 01:26:07.166: ERROR/AndroidRuntime(779): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) 11-16 01:26:07.166: ERROR/AndroidRuntime(779): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364) 11-16 01:26:07.166: ERROR/AndroidRuntime(779): ... 11 more </code></pre>
 

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