Android - Signed apk not starting on mobile device

Question

I ran into a very strange problem. When I directly copy the APK from the bin folder of the project and paste it into the SD card of the mobile phone. And install it, it works fine. So far I am doing the same with an export signed by the APK from the Android Tool in the project and placed by the APK on the SD card. It installs successfully, but does not start. I do not know why this is happening. I, too, are you in the application. Is this the reason the application crashes?

Logcat is displayed here

> FATAL EXCEPTION: main
Process: com.globalassignmenthelp, PID: 7708
java.lang.AbstractMethodError: abstract method "android.view.View q.a(android.view.View, java.lang.String, android.content.Context, android.util.AttributeSet)"
at r.onCreateView(Unknown Source)
at android.support.v4.app.FragmentActivity.onCreateView(Unknown Source)
at com.globalassignmenthelp.Perspective.onCreateView(Unknown Source)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:733)
at android.view.LayoutInflater.inflate(LayoutInflater.java:482)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
at com.android.internal.policy.impl.PhoneWindow.generateLayout(PhoneWindow.java:3571)
at com.android.internal.policy.impl.PhoneWindow.installDecor(PhoneWindow.java:3644)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:381)
at android.app.Activity.setContentView(Activity.java:2159)
at com.globalassignmenthelp.Perspective.onCreate(Unknown Source)
at android.app.Activity.performCreate(Activity.java:5966)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2408)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2517)
at android.app.ActivityThread.access$800(ActivityThread.java:162)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1412)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:189)
at android.app.ActivityThread.main(ActivityThread.java:5529)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:950)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745)

Please help and thanks in Advance.

Answer 1

, proguard. , - . project.properties , - Progurad

, .

Answer 2

add this code to proguard.txt

if you are using v4

 # support-v4
-dontwarn android.support.v4.**
-keep class android.support.v4.app.** { *; }
-keep interface android.support.v4.app.** { *; }
-keep class android.support.v4.** { *; }

if you are using v7

# support-v7
-dontwarn android.support.v7.**
-keep class android.support.v7.internal.** { *; }
-keep interface android.support.v7.internal.** { *; }
-keep class android.support.v7.** { *; }