My Android App Keeps Crashing

Question

I've started to learn Android Development and I got this snippit off of google android development site, it keeps on crashing.

My specs are:

Android 4.0.3 API 15

Code:

package lewes.android.hello;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class HelloAndroid extends Activity {
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       TextView tv = new TextView(this);
       tv.setText("Hello, Android");
       setContentView(tv);
   }
}

I get...

Unfortenualy, HelloAndroid is not responding.

Please help me!

MY MANIFEST:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="lewes.android.hello"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="15" />

<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".HelloWorld"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

LogCat:

03-17 11:35:19.835: D/AndroidRuntime(562): Shutting down VM
03-17 11:35:19.835: W/dalvikvm(562): threadid=1: thread exiting with uncaught 
exception (group=0x409c01f8) 
03-17 11:35:19.914: E/AndroidRuntime(562): FATAL EXCEPTION: main
03-17 11:35:19.914: E/AndroidRuntime(562): java.lang.RuntimeException: Unable to 
instantiate activity 
ComponentInfo{lewes.android.hello/lewes.android.hello.HelloWorld}: 
java.lang.ClassNotFoundException: lewes.android.hello.HelloWorld
03-17 11:35:19.914: E/AndroidRuntime(562):  at 
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1880)
03-17 11:35:19.914: E/AndroidRuntime(562):  at 
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
03-17 11:35:19.914: E/AndroidRuntime(562):  at 
android.app.ActivityThread.access$600(ActivityThread.java:123)
03-17 11:35:19.914: E/AndroidRuntime(562):  at  
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
03-17 11:35:19.914: E/AndroidRuntime(562):  at 
android.os.Handler.dispatchMessage(Handler.java:99)
03-17 11:35:19.914: E/AndroidRuntime(562):  at android.os.Looper.loop(Looper.java:137)
03-17 11:35:19.914: E/AndroidRuntime(562):  at 
android.app.ActivityThread.main(ActivityThread.java:4424)
03-17 11:35:19.914: E/AndroidRuntime(562):  at 
java.lang.reflect.Method.invokeNative(Native Method)
03-17 11:35:19.914: E/AndroidRuntime(562):  at 
java.lang.reflect.Method.invoke(Method.java:511)
03-17 11:35:19.914: E/AndroidRuntime(562):  at 
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
03-17 11:35:19.914: E/AndroidRuntime(562):  at 
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
03-17 11:35:19.914: E/AndroidRuntime(562):  at dalvik.system.NativeStart.main(Native 
Method)
03-17 11:35:19.914: E/AndroidRuntime(562): Caused by: 
java.lang.ClassNotFoundException: lewes.android.hello.HelloWorld
03-17 11:35:19.914: E/AndroidRuntime(562):  at 
dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
03-17 11:35:19.914: E/AndroidRuntime(562):  at 
java.lang.ClassLoader.loadClass(ClassLoader.java:501)
03-17 11:35:19.914: E/AndroidRuntime(562):  at  
java.lang.ClassLoader.loadClass(ClassLoader.java:461)
03-17 11:35:19.914: E/AndroidRuntime(562):  at 
android.app.Instrumentation.newActivity(Instrumentation.java:1023)
03-17 11:35:19.914: E/AndroidRuntime(562):  at  
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1871)
03-17 11:35:19.914: E/AndroidRuntime(562):  ... 11 more
03-17 11:40:20.114: I/Process(562): Sending signal. PID: 562 SIG: 9

Please help me!... No... Please send us your logcat: http://developer.android.com/guide/developing/tools/logcat.html — Waza_Be, Mar 17 '12 at 10:50
Window > Show View > Other Then expand Android and then select LogCat — Waza_Be, Mar 17 '12 at 11:00
It seems you should use your activity (`this`) after `onCreate()`. There is a [hello world](http://developer.android.com/resources/tutorials/hello-world.html) which uses static xml layout, I think you should begin with it. — , Mar 17 '12 at 11:24

mpeerman · Accepted Answer · 2012-03-17T11:55:00.797

2

Delete one of the application sections from your manifest. Keep the one where the activity corresponds to the name of your class.

make your manifest look exactly like this

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="lewes.android.hello"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="15" />

<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".HelloAndroid"
android:label="@string/app_name" >
<intent-filter>
    <action android:name="android.intent.action.MAIN" />

    <category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

</manifest>

edited Mar 17 '12 at 11:55

answered Mar 17 '12 at 11:05

mpeerman

2,050
2
16
16

In the package explorer toolbar which is probably on the left side of your screen find androidmanifest.xml – mpeerman Mar 17 '12 at 11:11
click on it. then at the bottom of what comes up should say "manifest" "application" "permissions" "instrumentation" "AndroidManifest.xml" Click on the last one – mpeerman Mar 17 '12 at 11:12
are you using eclipse with the plugin? – mpeerman Mar 17 '12 at 11:15
I found it, Now should I add it? – Jo Barton Mar 17 '12 at 11:16
I've fixed it, its now booting android. – Jo Barton Mar 17 '12 at 11:20
Just copy what i have in my answer. and delete everything in your manifest. Then paste mine in. – mpeerman Mar 17 '12 at 11:31
Ok, I just did that, im retrying my boot. – Jo Barton Mar 17 '12 at 11:33
Post your logcat again. It should be different now – mpeerman Mar 17 '12 at 11:38
I posted it! I think it has changed. – Jo Barton Mar 17 '12 at 11:47
Whats the name of your activity under the src folder? is it HelloWorld.java? – mpeerman Mar 17 '12 at 11:50
You've still called it "HelloWorld" in the manifest - it should be "HelloAndroid" - how many times do you need telling? – NickT Mar 17 '12 at 11:52
@mpeerman - it will work now that you've changed it to "HelloAndroid" from the "HelloWorld" that you did have originally – NickT Mar 17 '12 at 11:57

score 0 · Answer 2 · answered Mar 17 '12 at 11:27

0

Change

 <activity
        android:name=".HelloAndroidActivity"

to

<activity
        android:name=".HelloAndroid"

answered Mar 17 '12 at 11:27

NickT

23,844
11
78
121

1

As your manifest stands you have two applications in it, both are MAIN and LAUNCHER. You just want one, make it have name as above, not "HelloAndroidActivity" or "HelloWorld" it must match the name of the class – NickT Mar 17 '12 at 11:40
Using the manifest in my answer should work. I have recreated this exactly how you have it and it works. I need the logcat to figure out why it isnt working for you after these changes – mpeerman Mar 17 '12 at 11:47

score 0 · Answer 3 · answered Mar 17 '12 at 11:35

0

SDK does not mention about this. But as my experience, activity (this) can not be used inside onCreate(Bundle) to initialize new objects. To be used as a parameter for constructors, this is nothing within onCreate().

You can follow this hello world. It uses static xml layout.

Hope this helps you :-)

answered Mar 17 '12 at 11:35

yes it can be used. I have already copied his code and it ran perfect for me on an actual device. It seems he is using the emulator – mpeerman Mar 17 '12 at 11:37
Shall I try on my tablet then? – Jo Barton Mar 17 '12 at 11:38
No lets just take this one step at a time. – mpeerman Mar 17 '12 at 11:40
@mpeerman, Thank you, I haven't tested before posting the answer. But if it works on real device, it will work on emulator properly. Hope you will find out the bug :-) – Mar 17 '12 at 11:43

My Android App Keeps Crashing

3 Answers3

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