Develop Reference

Your device isn't compatible with this version :Can install apk manually in that device

I have built one android application and uploaded in playstore. Few devices most probably which are not having gps are not able to download from playstore. Playstore saying "your device isn't compatible with this version".
I am using
the following permission and features
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-feature android:name="android.hardware.location.gps" />
I didn't make the feature required=true, so far I know if don't mention required=true then it will not prevent devices to download which are not having such features.
For your information, manually I am able to install the apk to the same device. Your help is highly appreciated.

Android 6.0 Marshmallow and permissions

I built an application that uses the following permissions:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
When i try to install it manually on my android device (Android version 6.0.1) i get the following message:
Do you want to install this application? it does not require any special access.
But in fact it does require some special accesses, by the way, when i test on Devices with android 5.1 and prior, i was shown the permissions and asked to accept them.
this is a problem because i have to manually toggle the permissions on in the android settings in application management when on android 6.0.1 so the application works normally.
is there anything i have to add to my code to fix the issue for android 6+ ?
Another strange issue i noticed, at the page of my application on Playstore (close alpha testing for now) i get the following message in Permission details under developer section:
Item not found.
and this i get only on my android 6.0.1 device, and not in devices with prior versions.

Because the android M permission handle it differently, you need to ask the permissions at runtime
Take a look here :
https://developer.android.com/training/permissions/requesting.html

You need to ask for permissions at runtime in android 6+. This is the reason why no permission is asked when you are installing your application like its asking in android lollipop. Visit android developer page to learn how to ask for permission for android M and above visit : https://developer.android.com/training/permissions/requesting.html

Android: Where does the "System tools" permission come from?

I've got an Android App on Google Play and when installing it, it says it has the Persmission "System Tools - test access to protected storage. Allows the app to test a permission for USB storage that will be availavle on future devices".
I don't really understand that permission and I don't know which permission in my manifest activates this.
I use following permissions in my manifest.xml
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.VIBRATE" />

ANDROID:It has added a new permission that needs to be added for jelly bean. Please read this article for more details:
http://www.androidguys.com/2012/06/29/jelly-bean-has-new-permission-option-to-read-external-storage/
There is a new developer option to turn on read access restriction, for developers to test their applications against how Android will behave in the future. So, when you hop into the development options on your Jelly Bean device, don’t be surprised to see this new option. We won’t see the permission in Android 4.1.0, but most likely in 4.1.1, and its intention is to keep your device more secure.
Currently this permission is not enforced and is used for testing on devices that have enabled Protect USB storage under Developer options in the Settings app on a device running Android 4.1 or higher.

Android Why is my application not available on some compatible devices?

I have recently launched my application into the Google Play store but unfortunately some users are unable to download the application due to market restrictions.
Users are able to install the apk directly without the market, so I guess it must be something to do with the manifest?
<uses-sdk android:minSdkVersion="11" android:targetSdkVersion="14" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.VIBRATE"/>
The application can be found here http://tinyurl.com/cnejnjs
Screen layouts: SMALL NORMAL LARGE XLARGE
Required device features
android.hardware.touchscreen
This application is available to over 185 devices.
For example one user has had trouble downloading it to his Galaxy Note.

The Galaxy Note runs Android 2.3.6, which is API Level 10. You are mandating at least API Level 11.

It turns out having Copy Protection set to on within the application was causing this issue.

Android app in Amazon Market not showing on Kindle Fire

What is the trick to getting an app to show in the Amazon Market on the Kindle Fire?
I have submitted my android app to Amazon Marketplace and it was approved months ago. When I search for that app (through Amazon Marketplace) on my Motorola Xoom, or my wife's Nexus One, I am able to find it. Search on the Kindle, its nowhere to be found.
I read Amazon's suggestions at https://developer.amazon.com/help/faq.html regarding the Kindle Fire and it doesn't give any hints why it wouldn't show up. I have the following relevant entries in my Manifest:
<supports-screens
android:smallScreens="true"
android:normalScreens="true"
android:largeScreens="true"
android:resizeable="true"
android:anyDensity="true"
/>
<uses-permission android:name="android.permission.GET_ACCOUNTS"></uses-permission>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.GET_TASKS" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-sdk android:minSdkVersion="8" />

Amazon approve apps separately for the Kindle Fire. What is the nature of your application? Amazon are blocking certain apps from the Kindle Fire, seemingly where it competes with their services, like eReader apps.

Have you tried increasing the minSdkVersion?
<uses-sdk android:minSdkVersion="10" />
They explicitly say in the Amazon's suggestions:
Target: Android 2.3.4 - API Level 10
I'm using that sdk version in my app and I can find it the KF store without problems.