Hi I am completely new to Android programming and the question I am asking might be something very simple, but I do not have any idea about how to make it work, so kindly bear with me.
I installed android-sdk and related tools from the Android developer site. I followed their instructions to create a HelloWorld app, but I am getting some errors which I don't understand.
The file MainActivity.java is an auto generated file and I keep getting errors in this file in these places:
@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // error in activity_main } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); // error in activity_main return true; }
So I went and tried to look through the generated class file for layout.class and found there is no variable called activity_main there.
Can anyone kindly suggest what to do here? Any help will be deeply appreciated.
The directory structure shows me that I do have the AndroidManifest.xml.
When I try to run the app, I get this specific error:
AndroidManifest.xml file missing! Unknown Android Packaging Problem
These are some of the errors that i am getting when trying to get it running :
10-10 23:31:11.305: E/Trace(946): error opening trace file: No such file or directory (2) 10-10 23:31:11.955: E/AndroidRuntime(946): FATAL EXCEPTION: main 10-10 23:31:11.955: E/AndroidRuntime(946): android.content.res.Resources$NotFoundException: Resource ID #0x2 10-10 23:31:11.955: E/AndroidRuntime(946): at android.content.res.Resources.getValue(Resources.java:1013) 10-10 23:31:11.955: E/AndroidRuntime(946): at android.content.res.Resources.loadXmlResourceParser(Resources.java:2098) 10-10 23:31:11.955: E/AndroidRuntime(946): at android.content.res.Resources.getLayout(Resources.java:852) 10-10 23:31:11.955: E/AndroidRuntime(946): at android.view.MenuInflater.inflate(MenuInflater.java:107) 10-10 23:31:11.955: E/AndroidRuntime(946): at com.example.myfirstapp.MainActivity.onCreateOptionsMenu(MainActivity.java:18) 10-10 23:31:11.955: E/AndroidRuntime(946): at android.app.Activity.onCreatePanelMenu(Activity.java:2476) 10-10 23:31:11.955: E/AndroidRuntime(946): at com.android.internal.policy.impl.PhoneWindow.preparePanel(PhoneWindow.java:393) 10-10 23:31:11.955: E/AndroidRuntime(946): at com.android.internal.policy.impl.PhoneWindow.invalidatePanelMenu(PhoneWindow.java:747) 10-10 23:31:11.955: E/AndroidRuntime(946): at com.android.internal.policy.impl.PhoneWindow$1.run(PhoneWindow.java:2913) 10-10 23:31:11.955: E/AndroidRuntime(946): at android.os.Handler.handleCallback(Handler.java:615) 10-10 23:31:11.955: E/AndroidRuntime(946): at android.os.Handler.dispatchMessage(Handler.java:92) 10-10 23:31:11.955: E/AndroidRuntime(946): at android.os.Looper.loop(Looper.java:137) 10-10 23:31:11.955: E/AndroidRuntime(946): at android.app.ActivityThread.main(ActivityThread.java:4745) 10-10 23:31:11.955: E/AndroidRuntime(946): at java.lang.reflect.Method.invokeNative(Native Method) 10-10 23:31:11.955: E/AndroidRuntime(946): at java.lang.reflect.Method.invoke(Method.java:511) 10-10 23:31:11.955: E/AndroidRuntime(946): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 10-10 23:31:11.955: E/AndroidRuntime(946): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 10-10 23:31:11.955: E/AndroidRuntime(946): at dalvik.system.NativeStart.main(Native Method)
Every app project must have an AndroidManifest. xml file (with precisely that name) at the root of the project source set. The manifest file describes essential information about your app to the Android build tools, the Android operating system, and Google Play.
xml file is created in the app's corresponding dist folder. The file is located at WorkspaceName>/temp/<AppName>/build/luaandroid/dist. The manifest file provides essential information about your app to the Android operating system, and Google Play store.
Well, do you have an AndroidManifest. xml file within your project? Try: Click on your project -> Refresh (F5) -> Go to "Project" in the menu bar -> Clean (and clean the project). If all else fails, restart eclipse.
Just build your project or Clean it as "Clayton" mentioned below.
Project > Build All
Project > Clean
This I believe is because you do not have R.java file in your gen folder. Building your project will generate the R.java
file in your gen
folder and the errors should go away.
This happens because you're referring to your layout file using the following code
setContentView(R.layout.activity_main);
The reference to R.layout.activity_main
is declared in R.java
file which needs to be generated by building your project.
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