Android Studio signed APK when you encounter error Building android apk-duplicate V4 widget

From the literal meaning of the V4 packet repeatedly caused by the error, thought this simple, so in the app's Libs view, delete, because I am using the form of online compilation

So look under the dependency tree

Find V4 packages in almost every project

Google found a method after

Compile (' your package ') {

exclude group: ‘com.android.support‘, module: ‘support-v4‘

}

The meaning of this method is: The V4 package is excluded when compiling the package

Found no use

Then find a way in the overflow

configurations { all*.exclude group: ‘com.android.support‘, module: ‘support-v4‘ all*.exclude group: ‘com.android.support‘, module: ‘support-annotations‘ }

found that even the V4 of the project itself had been ruled out, no
after searching for a long time without a solution, I decided to take an exclusionary approach.

first create a new project, in the new project to introduce all the Moudule, signature, found through, so that the problem of moudule itself is excluded,
Since the basis sent a general direction after the application itself to troubleshoot, first of all, I use the type of import to the Libs of the jar are imported so save the trouble of repeated import every time

Compile Filetree (include: [' *.jar '], dir: ' Libs '),
After a long repetition of finding a v13 bag,

Google later found that this was

Android-support-v13 is a version compatible package that is released by Google, with a minimum compatible Android3.2 system. It was designed to develop a flat plate. Android 3.x systems are tablet-only systems, but the 3.x system has failed. So using V13 's package has no value.

Turns out this is not the equivalent of V4, then decisively deleted

Android Studio signed APK when you encounter error Building android apk-duplicate V4 widget