Android: crash on 3.0 app thats supposed to be backward compatible
this is a follow-up question to my question earlier this day.
I have installed the compatibility pack and restarted Eclipse. Then I created an activity like this, using Blundell's code:
public class EntryActivitiy extends Activity
{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.about);
int b = Integer.parseInt(Build.VERSION.SDK);
if (b >= Build.VERSION_CODES.HONEYCOMB)
{
Log.i(getString(R.string.app_name), "Found A Tablet Running Honeycomb or newer");
//nothing else in here yet
}
else
{
this.startActivity(new Intent(this, Main.class));
}
}
}
My Manifest contains:
<uses-sdk android:minSdkVersion="8"
android:targetSdkVersion="11"/>
<supports-screens android:smallScreens="false"
android:normalScreens="true"
android:largeScreens="true"
android:xlargeScreens="true"/>
as well as
<activity android:name="EntryActivity"
android:label="@string/app_name"
android:noHistory="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
开发者_开发问答 </activity>
In the project settings, I have set the build target to 3.0 as otherwise I'll get an "HONEYCOMB cannot be resolved or is not a field" error.
Now, if I run it on my 2.2 AVD, the app crashes like this:
05-27 14:13:54.270: ERROR/AndroidRuntime(329): FATAL EXCEPTION: main
05-27 14:13:54.270: ERROR/AndroidRuntime(329): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{/myPackage.EntryActivity}: java.lang.ClassNotFoundException: myPackage.EntryActivity in loader dalvik.system.PathClassLoader[/data/app/myPackage-1.apk]
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at android.os.Handler.dispatchMessage(Handler.java:99)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at android.os.Looper.loop(Looper.java:123)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at android.app.ActivityThread.main(ActivityThread.java:4627)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at java.lang.reflect.Method.invokeNative(Native Method)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at java.lang.reflect.Method.invoke(Method.java:521)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at dalvik.system.NativeStart.main(Native Method)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): Caused by: java.lang.ClassNotFoundException: myPackage.EntryActivity in loader dalvik.system.PathClassLoader[/data/app/myPackage-1.apk]
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
05-27 14:13:54.270: ERROR/AndroidRuntime(329): ... 11 more
If tried it on my 2.3 phone but got some weird screen flickering and "HDMI disconnected" and other very strange messages in the LogCat. I don't want to repeat it, though, so I can't provide the exact messages.
What am I doing wrong?
Kind regards, jellyfish
Edit:
I swapped back to my old main activity and it worked fine. Also, I commented all the HC-related code out and it still would crash. I also tried to set another Activity as main and that also worked. :/
EDIT
Your activity class is actually Misspelt!
Change it in your manifest or change your class name:
public class EntryActivitiy extends // here spellcheck
Original Answer
You need a period before the class name of your activity in your manifest:
<activity android:name=".EntryActivity"
android:label="@string/app_name"
android:noHistory="true">
Do a Project > Clean and it should Auto rebuild after this
You then need to check your manifest to ensure your package is correct:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.something.something"
....
I would also uninstall off the emulator after this, just to be safe , Emulator > Settings > Applications > Standard Uninstall
What's the package of EntryActivity? Is it in myPackage?
You need to place a period before the class name of your activity in the manifest:
<activity android:name=".EntryActivity"
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