Adding Maven Repository Causes An Error - Android.support.v7.widget.appcompattextview Can't Be Instantiated

Note: I have gone through all the related posts and did exactly what was written but nothing worked.I am trying to add ConstraintLayout 1.1.0-beta1 for percent dimensions, but when

Solution 1:

See my answer here. The NullPointerException related to AppCompatTextView can be fixed by changing the parent theme in res/values/styles.xml to one with Base e.g.

<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">

I just tried it and could use the ConstraintLayout beta attributes without getting an error.

Solution 2:

Try this.

In your Android Studio ,choose Tools --> Android --> SDK Manager

Then install this.

Edited

Could you show your detail of your intall?

And check your whether install 1.1.0-beta1

Solution 3:

Try Lowering your build version to 25

compileSdkVersion 25
buildToolsVersion "25.0.3"
defaultConfig {
    applicationId "com.snake.againimage"
    minSdkVersion 16
    targetSdkVersion 25
    versionCode 1
    versionName "1.0"compile'com.android.support.constraint:constraint-layout:1.+'

Then add the constraint layout

Solution 4:

Have you tried clean project and rebuilding it after changing the library to ConstraintLayout 1.1.0-beta1?