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POUnable to instantiate activity ComponentInfo error (Checked Manifest)
 

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  1. POUnable to instantiate activity ComponentInfo error (Checked Manifest)
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    <p>Hey guys I was running my app in an emulator but I ran into an error that caused the application to crash whenever I selected a list item. The error log I got was:</p> <pre><code>06-07 17:41:50.150: E/AndroidRuntime(624): FATAL EXCEPTION: main 06-07 17:41:50.150: E/AndroidRuntime(624): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.dapps.factpalooza/com.dapps.factpalooza.animal}: java.lang.NullPointerException 06-07 17:41:50.150: E/AndroidRuntime(624): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983) 06-07 17:41:50.150: E/AndroidRuntime(624): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 06-07 17:41:50.150: E/AndroidRuntime(624): at android.app.ActivityThread.access$600(ActivityThread.java:130) 06-07 17:41:50.150: E/AndroidRuntime(624): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 06-07 17:41:50.150: E/AndroidRuntime(624): at android.os.Handler.dispatchMessage(Handler.java:99) 06-07 17:41:50.150: E/AndroidRuntime(624): at android.os.Looper.loop(Looper.java:137) 06-07 17:41:50.150: E/AndroidRuntime(624): at android.app.ActivityThread.main(ActivityThread.java:4745) 06-07 17:41:50.150: E/AndroidRuntime(624): at java.lang.reflect.Method.invokeNative(Native Method) 06-07 17:41:50.150: E/AndroidRuntime(624): at java.lang.reflect.Method.invoke(Method.java:511) 06-07 17:41:50.150: E/AndroidRuntime(624): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 06-07 17:41:50.150: E/AndroidRuntime(624): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 06-07 17:41:50.150: E/AndroidRuntime(624): at dalvik.system.NativeStart.main(Native Method) 06-07 17:41:50.150: E/AndroidRuntime(624): Caused by: java.lang.NullPointerException 06-07 17:41:50.150: E/AndroidRuntime(624): at android.app.Activity.findViewById(Activity.java:1825) 06-07 17:41:50.150: E/AndroidRuntime(624): at com.dapps.factpalooza.animal.&lt;init&gt;(animal.java:29) 06-07 17:41:50.150: E/AndroidRuntime(624): at java.lang.Class.newInstanceImpl(Native Method) 06-07 17:41:50.150: E/AndroidRuntime(624): at java.lang.Class.newInstance(Class.java:1319) 06-07 17:41:50.150: E/AndroidRuntime(624): at android.app.Instrumentation.newActivity(Instrumentation.java:1053) 06-07 17:41:50.150: E/AndroidRuntime(624): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974) 06-07 17:41:50.150: E/AndroidRuntime(624): ... 11 more </code></pre> <p>I've looked up this problem and it seemed like it had something to do with my manifest and not declaring activities properly, but I haven't messed with my manifest since it was working properly before. Even after a double check my manifest looked fine. I have no idea what's causing this error and what's causing my app to crash. My manifest:</p> <pre><code>&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.dapps.factpalooza" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="8" android:targetSdkVersion="17" /&gt; &lt;uses-permission android:name="android.permission.INTERNET"&gt;&lt;/uses-permission&gt; &lt;uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/&gt; &lt;application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" android:debuggable="true"&gt; &lt;activity android:name="com.google.ads.AdActivity" android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"&gt; &lt;/activity&gt; &lt;activity android:name="com.dapps.factpalooza.StartMenu" 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="com.dapps.factpalooza.animal" android:label="@string/app_name" &gt; &lt;/activity&gt; &lt;activity android:name="com.dapps.factpalooza.Food" android:label="@string/app_name" &gt; &lt;/activity&gt; &lt;activity android:name="com.dapps.factpalooza.World" android:label="@string/app_name" &gt; &lt;/activity&gt; &lt;activity android:name="com.dapps.factpalooza.Law" android:label="@string/app_name" &gt; &lt;/activity&gt; &lt;activity android:name="com.dapps.factpalooza.Random_facts" android:label="@string/app_name" &gt; &lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p>My code for the menu:</p> <pre><code>package com.dapps.factpalooza; import android.os.Bundle; import android.app.ListActivity; import android.content.Intent; import android.view.View; import android.widget.ArrayAdapter; import android.widget.ListView; public class StartMenu extends ListActivity { String menuItems[] = {"Animal Facts", "Food Facts", "World Facts","Random Facts","Crazy Laws"}; String classNames[] = {"animal","Food","World","Random_facts","Law"}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setListAdapter(new ArrayAdapter&lt;String&gt;(StartMenu.this, android.R.layout.simple_list_item_1, menuItems)); } @Override protected void onListItemClick(ListView l, View v, int position, long id) { // TODO Auto-generated method stub super.onListItemClick(l, v, position, id); String classSelect = classNames[position]; try{ Class select = Class.forName("com.dapps.factpalooza." + classSelect); Intent selection = new Intent(StartMenu.this, select); startActivity(selection); }catch(ClassNotFoundException e){ e.printStackTrace(); } } } </code></pre> <p>and the code from one of my pages from the list:</p> <pre><code>package com.dapps.factpalooza; import java.util.Random; import com.google.ads.AdRequest; import com.google.ads.AdView; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; public class animal extends Activity { Button Generate; TextView Fact; TextView factNum; String animal_facts[] = { "Fact1", "Fact2", "Fact3", "Fact4", "Fact5", "Fact6", }; int total_facts = 5; Random r = new Random(); int Choosen; AdView ad = (AdView) findViewById(R.id.ad); @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.main); Generate = (Button) findViewById(R.id.generate); Fact = (TextView) findViewById(R.id.fact_display); factNum = (TextView) findViewById(R.id.fact_number); Generate.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub ad.loadAd(new AdRequest()); Choosen = r.nextInt(total_facts); Fact.setText(animal_facts[Choosen]); factNum.setText("Fact # "+ Choosen); } }); } } </code></pre>
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