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Issues running any new android project - Default Activity Not found / Invalid Java package

total noob with lots of issues with Android Studio.
Default Activity error
Invalid java package name
Getting a Default Activity error on any app or new project I run - below is an example of the AndroidManifest.xml
"Error running 'app': Default Activity not found"
I have checked more than 100 times I am using the right package names and that my activity is declared in the android manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.example.coleary.change;">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity
android:name="com.example.coleary.change.MainActivity"
android:configChanges="keyboard|keyboardHidden|orientation|screenSize"
android:label="#string/TicTacToe"
android:theme="#style/AppTheme"
android:windowSoftInputMode="adjustResize">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
The package name is the same in the java code:
package com.example.coleary.change;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
// use tictactoe code in our code for a new game
private TicTacToeGame mGame;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(com.example.coleary.change.R.layout.activity_main);
//this activity(game) is a context within a main activity
mGame= new TicTacToeGame(this);
}
}
When I run the project I get the following error also:
Package 'com.example.coleary.change;' from AndroidManifest.xml is not a valid Java package name as 'change;' is not a valid Java identifier.
I have changed the package name through Refactoring to 5 different names to no avail.
I have spent over 15 hours hours trying to troubleshoot these issues and because I have the same issue on multiple projects / packages and apps I am completely stuck - any help really appreciated!

Remove the semi-colon after change in your AndroidManifest. Package names can't contain semi-colons.

Getting started with Google Play Services, Cannot Resolve Symbol

I am developing a Android Studio project using gradle 2.2 and Google Play Services 12.0.1. I am now trying to add functionality from Google Play Services.
The thing is I am unable to import the Google Play Service library. When I try the following line.
import com.google.android.gms.games.Games;
Or anything similar i get "Cannot resolve symbol Games", Android Studio proposes "Add library <...> to classpath" but that does not seem to change anything.
What I have done so far
I started out following this setup guide. Which simply says to update your build.gradle. My top-level build.gradle contains this,
project(":android") {
apply plugin: "android"
apply plugin: 'com.android.application'
configurations { natives }
dependencies {
compile project(":core")
compile "com.badlogicgames.gdx:gdx-backend-android:$gdxVersion"
< ... >
compile "com.google.android.gms:play-services-games:12.0.1"
}
}
I have also ensured that the buildscript section contains the maven link. I have also checked that Google Play Services are installed from the "SDK Tools" pane in the SDK manager. In addition to this I have added the correct version of Play Services as a dependency in Project structure -> Modules -> Dependencies. Someone suggested on earlier Stack Overflow questions that adding
<meta-data android:name="com.google.android.gms.version"
android:value="#integer/google_play_services_version" />
to the AndroidManifest might help, so my Manifest looks like this:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="wizard_team.wizards_tale" >
<uses-sdk android:minSdkVersion="14" android:targetSdkVersion="27" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/GdxTheme" >
<activity
android:name="wizard_team.wizards_tale.AndroidLauncher"
android:label="#string/app_name"
android:screenOrientation="landscape"
android:configChanges="keyboard|keyboardHidden|navigation|orientation|screenSize">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<meta-data android:name="com.google.android.gms.version"
android:value="#integer/google_play_services_version" />
</application>
I do not receive any error messages when I resync and I have tried to update and restart Android Studio several times. I have also tried "Invalidate chaches/restart..".
During my quest on Google I have found several people experiencing the same problem and I have tried their solutions but nothing has worked. I have spent way to long with this problem, does anyone have any suggestions?

Solved it. As I do not have much experience creating apps I tried importing google play services into the core-module part of my app. For anyone else just getting started, the android specific code such as this should go in android -> java -> [package-name].
Might seem trivial, but as a beginner using this setup tool this problem kept me searching for hours.

RuntimeException : Didn't find class on path: DexPathList

Yesterday everything worked fine with my project, but today I receive very weird errors :
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.redonbas/com.example.redonbas.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.example.redonbas.MainActivity" on path: DexPathList[[zip file "/data/app/com.example.redonbas-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.redonbas-2, /vendor/lib, /system/lib]]
My AndroidManifest :
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
MainActivity is in correct package:
I refered to the problem but I copied all the File System of the project to the new, but that didn't help. I also created new project with another package and manually copied all the stuff from the old project there - the problem still remains!
What's wrong with it?

Uncheck your Android Dependencies and Android Private Libraries Checkboxes.

Yes, the problem was in past SherlockActionBar and its android-support library implementing .

Blank Screen Android 2.2 Google Maps v2

EDIT :
I transferred my 20+ projects that tries to use Google Maps for Android v2. After changing keys and stuff, now, it works. I don't know what made this work, but thank you all. I got one keystore, the key is right. I guess it magically fixed somehow. Well, thanks guys.
I'm doing searches for 2 days and I couldn't fix this problem. I did everything, yet, this application can not work.
I want my application to work on Android 2.2 and above. Like it says "if you create your app in level 8, it'll support 95% of market".
Here are my screenshots and source codes:
I'm pasting the source code which is the easiest to get. I took this from web.
Here's the output of the command
keytool -list -keystore <path>
***************** WARNING WARNING WARNING *****************
* The integrity of the information stored in your keystore *
* has NOT been verified! In order to verify its integrity, *
* you must provide your keystore password. *
***************** WARNING WARNING WARNING *****************
Keystore type: JKS Keystore provider: SUN
Your keystore contains 1 entry
androiddebugkey, 15.Mar.2013, PrivateKeyEntry,
Certificate fingerprint (SHA1): xxx
main.xml file:
<?xml version="1.0" encoding="utf-8"?>
<com.google.android.maps.MapView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mapView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:clickable="true"
android:apiKey="AIzaSyDim-x5Gxxx"
/>
manifest file:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.androidhive.googlemaps"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<!-- Add Google Map Library -->
<uses-library android:name="com.google.android.maps" />
<activity
android:name=".AndroidGoogleMapsActivity"
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>
<!-- Allow to connect with internet -->
<uses-permission android:name="android.permission.INTERNET" />
</manifest>
java file (no need to paste it all, but I guess it's best to paste it all)
http://pastebin.com/yF95Rcbd
Here are my screenshots:
http://i.imgur.com/gExHpUG.png
http://i.imgur.com/AMOXKhr.png
http://i.imgur.com/Aqon97Y.png
I'm trying to compile this app to Android 4.2.2, but I tried and want to make it work in 2.2 and above.
Here's the Android tab of the properties window just to make sure:
http://i.imgur.com/ht0CQwT.png
Here's my log
03-20 07:01:20.145: W/System.err(956): at java.lang.Thread.run(Thread.java:856)
03-20 07:01:20.665: W/System.err(956): IOException processing: 26
03-20 07:01:20.665: W/System.err(956): java.io.IOException: Server returned: 3
03-20 07:01:20.665: W/System.err(956): at android_maps_conflict_avoidance.com.google.googlenav.map.BaseTileRequest.readResponseData(BaseTileRequest.java:115)
03-20 07:01:20.675: W/System.err(956): at android_maps_conflict_avoidance.com.google.googlenav.map.MapService$MapTileRequest.readResponseData(MapService.java:1473)
03-20 07:01:20.675: W/System.err(956): at android_maps_conflict_avoidance.com.google.googlenav.datarequest.DataRequestDispatcher.processDataRequest(DataRequestDispatcher.java:1117)
03-20 07:01:20.675: W/System.err(956): at android_maps_conflict_avoidance.com.google.googlenav.datarequest.DataRequestDispatcher.serviceRequests(DataRequestDispatcher.java:994)
03-20 07:01:20.675: W/System.err(956): at android_maps_conflict_avoidance.com.google.googlenav.datarequest.DataRequestDispatcher$DispatcherServer.run(DataRequestDispatcher.java:1702)
These lines repeat all the time.
Thank you very much.
Your post appears to contain code that is not properly formatted as code" error made
me delete the blank lines. Sorry for the messed up codes.

http://i.imgur.com/ht0CQwT.png
See the snapshot. You did not add Google Play Services library that is require for displaying Google Android Map V2. Please download and add that library and then try again.
Please also see the target. Your target is 4.2.2 and your are accessing it on 2.2. Change the target to 2.2 and use support fragment.
Thanks,

I have solved this issue,
Open your Google APIs Console
Choose API Access
Edit allowed Android apps from your API Key
Change the package name with your package name
Example: 00:06:A5:0E:04:A2:1E:8F:FE:6B:7F:46:23:C3:xx:xx:xx:xx:xx:xx;com.example.androidmapview

You are missing permissions and meta-data for API KEY.
Read this carefully: https://developers.google.com/maps/documentation/android/start

Working with android mapapi v2 ,the main reason is you must add play service to your app,like below :
<permission
android:name="com.example.androidmapview.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-permission android:name="com.example.androidmapview.permission.MAPS_RECEIVE" />
Use fragment class in Layout:
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:map="http://schemas.android.com/apk/res-auto"
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent"
class="com.google.android.gms.maps.SupportMapFragment"/>
And change your manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.androidmapview"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="16" />
<permission
android:name="com.example.androidmapview.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-permission android:name="com.example.androidmapview.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.androidmapview.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"></meta-data>
</application>
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
</manifest>
in activity:
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import com.google.android.gms.maps.SupportMapFragment;
public class MainActivity extends FragmentActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
SupportMapFragment fragment = new SupportMapFragment();
getSupportFragmentManager().beginTransaction()
.add(android.R.id.content, fragment).commit();
}
}
For more info check the link which will explain you in details about api v2

I solved my blank screen problem with zoom in/out buttons like that.(it happens after I changed my package name)
Delete the keystore file
Create a new keystore file
Get SHA1 fingerprint
Go to API Console
Create a new Android App.
Paste your fingerprint
Use the given API Key in your Manifest File
That worked for me

AndroidManifest.xml errors

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android">
<application android:icon="#drawable/ic_launcher" android:label="#string/app_name">
<activity android:name=".hba1c" android:label="#string/app_name"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
I'm trying to learn Java and need some help with AndroidManifest.xml
My little hello world project is working code-wise, but I'm confused with making changes to the manifest. Specifically, in the code above package name is "com.android" and in data/app my app shows up as com.android-1.apk. When I try to change it to something like com.jocala or com.jocala.hba1c I get package R does not exist errors through my compile, which fails.
What changes do I need to make? Anything else here that is glaringly bad?
I am working using Ant, VI and the Linux console, no Eclipse.

You should change the package of the java code, let it in accordance with the package which you defined in the manifest file.

The manifest holds meta-data corresponding to your android application. Hence, if you needs changes in the package name, make the changes in the java files, change the package name there, there is no sense making a change here. The only changes that are majorly done in the manifest are activity related(for beginners). Have a read here.