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POThenewboston Lesson 21 crash. Finishing Listactivity
 

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  1. POThenewboston Lesson 21 crash. Finishing Listactivity
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    <p>I am learning android application development using The New Boston tutorials. I completed lesson 21, but when i run my code, the application crashes after the splash screen (i.e the logo). Please help. I don't want to quit this tutorial. If there is anything else from eclipse u need except the data given below please let me know. Thanks in advance.</p> <p><strong>My manifest:</strong></p> <pre><code>&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.thenewboston.pok" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="8" android:targetSdkVersion="15" /&gt; &lt;application android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" &gt; &lt;activity android:name=".Splash" android:label="@string/title_activity_the_new_boston" &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=".TheNewBostonActivity" android:label="@string/title_activity_the_new_boston" &gt; &lt;intent-filter&gt; &lt;action android:name="com.thenewboston.pok.THENEWBOSTONACTIVITY" /&gt; &lt;category android:name="android.intent.category.DEFAULT" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;activity android:name=".MENU" android:label="@string/title_activity_the_new_boston" &gt; &lt;intent-filter&gt; &lt;action android:name="com.thenewboston.pok.MENU" /&gt; &lt;category android:name="android.intent.category.DEFAULT" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p><strong>My Menu.java:</strong></p> <pre><code>package com.thenewboston.pok; import android.app.ListActivity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.ArrayAdapter; import android.widget.ListView; public class Menu extends ListActivity{ String classes[]={"TheNewBostonActivity", "example1", "example2", "example3", "example4", "example5", "example6"}; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setListAdapter(new ArrayAdapter&lt;String&gt;(Menu.this, android.R.layout.simple_list_item_1, classes)); } @Override protected void onListItemClick(ListView l, View v, int position, long id) { // TODO Auto-generated method stub super.onListItemClick(l, v, position, id); String cheese = classes[position]; try{ Class ourClass = Class.forName("com.thenewboston.pok." + cheese); Intent ourIntent = new Intent(Menu.this, ourClass); startActivity(ourIntent); } catch (ClassNotFoundException e){ e.printStackTrace(); } } } </code></pre> <p><strong>My Splash.java:</strong></p> <pre><code>package com.thenewboston.pok; import android.app.Activity; import android.content.Intent; import android.os.Bundle; public class Splash extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.splash); Thread timer = new Thread(){ public void run() { try{ sleep(5000); }catch (InterruptedException e){ e.printStackTrace(); }finally{ Intent open1= new Intent ("com.thenewboston.pok.MENU"); startActivity(open1); } } }; timer.start(); } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); } } </code></pre> <p><strong>My TheNewBostonActivity.java:</strong></p> <pre><code>package com.thenewboston.pok; import android.media.MediaPlayer; import android.os.Bundle; import android.app.Activity; import android.view.View; import android.widget.Button; import android.widget.TextView; public class TheNewBostonActivity extends Activity { MediaPlayer ourSong; int counter; Button add, sub; TextView display; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ourSong = MediaPlayer.create(TheNewBostonActivity.this, R.raw.undisclosed_desires); ourSong.start(); counter = 0; add = (Button) findViewById(R.id.bAdd); sub = (Button) findViewById(R.id.bSub); display = (TextView) findViewById(R.id.tvDisplay); add.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { // TODO Auto-generated method stub counter++; display.setText("Your Total Is " + counter); } }); sub.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { // TODO Auto-generated method stub counter--; display.setText("Your Total Is " + counter); } }); } @Override protected void onStop() { // TODO Auto-generated method stub super.onStop(); ourSong.release(); } } </code></pre> <p><strong>My log file:</strong></p> <pre><code>09-25 14:56:56.778: D/AndroidRuntime(336): Shutting down VM 09-25 14:56:56.778: W/dalvikvm(336): threadid=1: thread exiting with uncaught exception (group=0x40015560) 09-25 14:56:56.797: E/AndroidRuntime(336): FATAL EXCEPTION: main 09-25 14:56:56.797: E/AndroidRuntime(336): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.thenewboston.pok/com.thenewboston.pok.MENU}: java.lang.ClassNotFoundException: com.thenewboston.pok.MENU in loader dalvik.system.PathClassLoader[/data/app/com.thenewboston.pok-1.apk] 09-25 14:56:56.797: E/AndroidRuntime(336): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569) 09-25 14:56:56.797: E/AndroidRuntime(336): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 09-25 14:56:56.797: E/AndroidRuntime(336): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 09-25 14:56:56.797: E/AndroidRuntime(336): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 09-25 14:56:56.797: E/AndroidRuntime(336): at android.os.Handler.dispatchMessage(Handler.java:99) 09-25 14:56:56.797: E/AndroidRuntime(336): at android.os.Looper.loop(Looper.java:123) 09-25 14:56:56.797: E/AndroidRuntime(336): at android.app.ActivityThread.main(ActivityThread.java:3683) 09-25 14:56:56.797: E/AndroidRuntime(336): at java.lang.reflect.Method.invokeNative(Native Method) 09-25 14:56:56.797: E/AndroidRuntime(336): at java.lang.reflect.Method.invoke(Method.java:507) 09-25 14:56:56.797: E/AndroidRuntime(336): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 09-25 14:56:56.797: E/AndroidRuntime(336): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 09-25 14:56:56.797: E/AndroidRuntime(336): at dalvik.system.NativeStart.main(Native Method) 09-25 14:56:56.797: E/AndroidRuntime(336): Caused by: java.lang.ClassNotFoundException: com.thenewboston.pok.MENU in loader dalvik.system.PathClassLoader[/data/app/com.thenewboston.pok-1.apk] 09-25 14:56:56.797: E/AndroidRuntime(336): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240) 09-25 14:56:56.797: E/AndroidRuntime(336): at java.lang.ClassLoader.loadClass(ClassLoader.java:551) 09-25 14:56:56.797: E/AndroidRuntime(336): at java.lang.ClassLoader.loadClass(ClassLoader.java:511) 09-25 14:56:56.797: E/AndroidRuntime(336): at android.app.Instrumentation.newActivity(Instrumentation.java:1021) 09-25 14:56:56.797: E/AndroidRuntime(336): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561) 09-25 14:56:56.797: E/AndroidRuntime(336): ... 11 more </code></pre>
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    1. COPlease post your logcat logs with exceptions that crashed the app. :)
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    2. COTop tip. Learn how to read stack traces in logcat. Will save you a lot of time. "Caused by" leads you right to the error 99% of the time.
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