Bdtjtk

I've just followed an online tutorial for creating CardViews in JAVA (tutorial I used). When I use the SDK version 26 the view appears, however, when I change the app to anything such as version 27 or 28, the card view changes or I'm no longer able to see it. Sorry if this seems like a silly question but I couldn't find any documentation for the latest version.

Here's my Activity_Main.xml:

 <android.support.v7.widget.CardView android:layout_width="300dp"

                                            android:layout_height="170dp"

                                            android:layout_margin="10dp">



            ...



        </android.support.v7.widget.CardView>

My Gradle:

compileSdkVersion 28

targetSdkVersion 28

implementation 'com.android.support:appcompat-v7:28.0.0'

implementation 'com.android.support:cardview-v7:28.0.0'

Preferably I want something that can be flexible to multiple SDK versions and can be supported in future SDK releases. If there's an alternative I'd happily use one.

Check if you didn't place the resources in a version specific folder. Open your project in the Project perspective and check if the resource folder is not something like foldername-v26, if so, change the location to a general location, so you can access it in every API level.

UPDATE = I've changed it from CardView to ButtonBarLayout (just to see if that would make a difference) and I'm receiving a new error. Does this mean the issue lies with something other in the project and not the CardView? I've also attached the error messages received. Picture of new error.

java.lang.ClassNotFoundException: android.view.View$OnUnhandledKeyEventListener

at org.jetbrains.android.uipreview.ModuleClassLoader.load(ModuleClassLoader.java:180)

at com.android.tools.idea.rendering.RenderClassLoader.findClass(RenderClassLoader.java:61)

at org.jetbrains.android.uipreview.ModuleClassLoader.findClass(ModuleClassLoader.java:118)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

at org.jetbrains.android.uipreview.ModuleClassLoader.loadClass(ModuleClassLoader.java:213)

at android.support.v7.widget.ButtonBarLayout.onMeasure_Original(ButtonBarLayout.java:134)

at android.support.v7.widget.ButtonBarLayout.onMeasure(ButtonBarLayout.java)

at android.view.View.measure(View.java:22035)

at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6622)

at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1514)

at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1167)

at android.widget.LinearLayout.onMeasure(LinearLayout.java:687)

at android.view.View.measure(View.java:22035)

at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6622)

at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1514)

at android.widget.LinearLayout.measureVertical(LinearLayout.java:806)

at android.widget.LinearLayout.onMeasure(LinearLayout.java:685)

at android.view.View.measure(View.java:22035)

at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6622)

at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)

at android.view.View.measure(View.java:22035)

at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)

at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)

at android.view.View.measure(View.java:22035)

at com.android.layoutlib.bridge.impl.RenderSessionImpl.measureView(RenderSessionImpl.java:590)

at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:343)

at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:384)

at com.android.tools.idea.layoutlib.LayoutLibrary.createSession(LayoutLibrary.java:193)

at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:544)

at com.android.tools.idea.rendering.RenderTask.lambda$inflate$3(RenderTask.java:678)

at java.util.concurrent.FutureTask.run(FutureTask.java:266)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at java.lang.Thread.run(Thread.java:745)