Develop Reference

My app doesn't show up on android studio emulator

It was all good yesterday, but right now it won't show up when I run the AVD.
Don't know if it is my AndroidManifest.xml file which is pretty standard.
<?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.app" >
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme">
<activity
android:name="com.example.app.Hoved"
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>
This is now fixed all, thank you!
The problem was that I write Android app on Xamarin, so you use flags there instead of declaring the activity in the manifest.

You missing this 2 'lines', it's really important but just past it above (over) < application and it's will work.
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="21" />
This is the most basic question, you should know that before u start programming in visual studio or eclipse. Just watch some tutorials on youtube it will help you. Good Luck.

My debug AndroidManifest.xml is giving me "cannot resolve symbol errors"

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="ac.tec.oop.ahorcado.android"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="7"
android:targetSdkVersion="16"/>
<application android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme">
<activity android:label="#string/app_name"
android:name="ac.tec.oop.ahorcado.android.MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
</manifest>
These lines are giving me "cannot resolve symbol errors", even though the packages from which they need to be referenced is clearly written. I've trying to fix this for hours but I don't know what else to do. I'm using Android Studio, and it has caused me a great number of problems.
android:icon="#drawable/ic_launcher
android:label="#string/app_name"
android:theme="#style/AppTheme">
android:name="ac.tec.oop.ahorcado.android.MainActivity">

Go to File > Invalidate Caches / Restart and Invalidate and Restart.
This cleared the errors for me.

There is no issue with your Manifest code this will work fine
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="ac.tec.oop.ahorcado.android"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="7"
android:targetSdkVersion="16"/>
<application android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme">
<activity android:label="#string/app_name"
android:name="ac.tec.oop.ahorcado.android.MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
</manifest>
Some times Eclipse shows unexpected behavior you can cut and paste again the code to Manifest or just restart the IDE it will recompile and remove the error

I tried all mentioned Answer but non of above worked for me
The only Solution worked for me was
Go to Gradle(App)> in the repositories {}> make sure that mavenCentral() is on top>and now remove compile 'which you recently added>sync > Now add again compile "again add the dependencies" > and final sync again
This worked for me

try to add debuggable to true in application tag in manifest
<application android:allowBackup="true"
android:debuggable="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme">
I hope it,s work for you.

Export Problems - to .apk

App works fine when tested from Eclipse on phone via USB/Sync, when I try and Export it to an .apk, the Manifest.xml looses track of 2 activities under the parent "MasterActvity". Then even the USB/Sync stops working because it can't locate the activities. No memory storage is used, just text displays.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.theoreferenceguide"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.theoreferenceguide.MasterActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="TipActivity"></activity> This keeps getting kicked out during .apk
<activity android:name="UccActivity"></activity> This keeps getting kicked out during .apk
</application>
</manifest>

I agree with nicopico. It looks like you are missing the . infront of the activity which tells the manifest that the activity is in the local namespace. Alternatively if TipActivity is in the same namespace as MasterActivity you can also do android:name="com.example.theoreferenceguide.TipActivity"

Android error: Application is not installed on your phone

I am getting this error when trying to install my exported unsigned application on tablet pc (running Android 4.04. version). App is normally installing and running in Android emulator in Eclipse. I tried removing and reinstalling it, but that didn't help either. Atached is my AndroidManifest.xml since problem is often there (but I can't see any duplicate code).
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="hr.punctum.LociranjePonudaProizvoda"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="9" android:targetSdkVersion="16" />
<application
android:label="#string/app_name"
android:icon="#drawable/ic_launcher"
android:theme="#style/AppTheme">
<activity
android:label="#string/app_name"
android:name=".ListaProizvoda" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="DetaljiProizvoda"></activity>
<activity android:name="GMapsActivity"></activity>
<uses-library android:name="com.google.android.maps" />
</application>
<uses-permission android:name="android.permission.INTERNET"/>
</manifest>

The only thing suspicious I see is the uses-library tag, do you have the Google Maps lib in your tablet? (if yes then you should have the following files in it)
/system/etc/permissions/com.google.android.maps.xml
/system/framework/com.google.android.maps.jar
Without the lib the apk installation will fail with INSTALL_FAILED_MISSING_SHARED_LIBRARY error.

Uninstalling Android Application

When I create an Android project in Eclipse and send it to my device for debugging, the app works fine but when I try to uninstall it, I get a strange message. Below are the steps to recreate my problem:
Eclipse Version: 4.2.0 Build id: I20120608-1400
ADT Version: 2.0.3 v201208082019-427395
Run Eclipse
Click File->New->Project...
Select Android/Android Application Project
Click Next.
Enter Application Name: Test
Build SDK: Android 4.1
Minimum Required SDK: API 8 Android 2.2
Enable: Create custom launcher icon / Create project in workspace
Click Next thrice.
Click Finish.
Connect 4.1 Android device to computer via USB.
Click Run->Run from menu.
Select "Android application" on popup the "Run As" popup.
Click Ok.
MainActivity application runs on device.
Click the Back button on the Android device.
Open applications on device and find "MainActivity" app.
Long press the MainActivity icon and drag to trash.
Here's the puzzling part:
Instead of getting a standard
Do you want to uninstall this app?
I get a dialog with this text:
MainActivity is part of the following app: Test
Do you want to uninstall this app?
Why do I get this message instead of the standard one?
Why is MainActivity the name of the app when I specifically stated the name of the app is "Test"?
Additional Information:
If I go to Settings->Apps, the Application shows up as Test but is listed in my Launcher as MainActivity.
AndroidManifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.test"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

The solution is to remove android:label="#string/title_activity_main" in the activity element.
The AndroidManifest.xml below solves the problem on Android 4.1.1 .
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.test"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

Make sure your app name app_name is not styled.
Since I was using the app name somewhere else in the app I had made it bold, like this - In my strings.xml
<string name="app_name"><b>We are sons<b></string>
When I removed
<b></b>
tags, it worked.
Just keep it :
<string name="app_name">We are sons</string>

I do not know how to solve the first issue but the second can be solved in the following way. The problem is connected with Android new project wizzard. To solve this problem you can correct your manifest file in the following way and redeploy your project:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.test"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/title_activity_main" >
<intent-filter android:label="#string/app_name" >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
Do not forget to check what is the value of app_name. Some more details you can find in this post