Android studio 3.X does not render xml file due to java class missing

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

In my very first project is obviously Hello world and I just open android studio and click on the empty activity and then w8 for the build to finish but it doesn't render the app as I expected. I reinstalled android studios and JDK10. but it doesn't work. the project shows fine in virtual device and I can even edit hello world to any string, but in XML view, it just shows a white screen and its showing every time. Below is the stack trace:

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.ActionBarContainer.(ActionBarContainer.java:62) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at org.jetbrains.android.uipreview.ViewLoader.createNewInstance(ViewLoader.java:481) at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:264) at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:222) at com.android.tools.idea.rendering.LayoutlibCallbackImpl.loadView(LayoutlibCallbackImpl.java:209) at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:337) at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:348) at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:248) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730) at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:863) at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:72) at android.view.LayoutInflater.rInflate(LayoutInflater.java:837) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824) at android.view.LayoutInflater.inflate(LayoutInflater.java:515) at android.view.LayoutInflater.inflate(LayoutInflater.java:423) at com.android.layoutlib.bridge.bars.BridgeActionBar.(BridgeActionBar.java:89) at com.android.layoutlib.bridge.bars.AppCompatActionBar.(AppCompatActionBar.java:68) at com.android.layoutlib.bridge.impl.Layout.createActionBar(Layout.java:277) at com.android.layoutlib.bridge.impl.Layout.(Layout.java:161) at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:288) 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)

First of all we are developing an app, so we don't need to face these types of issues because it has no valid reason to get such errors. So I suggest you use always stable version of every dependency, and this is because of unstable version using.

The issue you faced was due to using alpha version of AppCompact library. Use stable version to get rid of this issue now and in future.

FIRST Currently 27.1.1 is latest version of AppComactV7. You can see Maven Repo link to find out latest. final def SUPPORT_VERSION = "27.1.1" implementation "com.android.support:appcompat-v7:$SUPPORT_VERSION" implementation "com.android.support:design:$SUPPORT_VERSION" // use only if already using I use definitions to have same version for all support versions. Also ignore design library if you are not already using it.

SECOND You also need to downgrade your compileSdkVersion & targetSdkVersion to remove some gradle warnings. compileSdkVersion 27 targetSdkVersion 27

Below is full example of build.gradle (Module:app)

apply plugin: 'com.android.application' android { compileSdkVersion 28 defaultConfig { applicationId "com.example.hp.myapplication" minSdkVersion 15 targetSdkVersion 27 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } } final def SUPPORT_VERSION = "27.1.1" dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation "com.android.support:appcompat-v7:$SUPPORT_VERSION" implementation "com.android.support:design:$SUPPORT_VERSION" implementation 'com.android.support.constraint:constraint-layout:1.1.3' testImplementation 'junit:junit:4.12' androidTestImplementation 'com.android.support.test:runner:1.0.2' androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2' implementation 'com.android.support:gridlayout-v7:27.1.1' }

Emulator: ERROR: x86 emulation currently requires hardware acceleration

The problem is very simple and am going to solve that problem in very simple way. Problem is to lunch android app from Android Studio. The problem is as below described:

Emulator: ERROR: x86 emulation currently requires hardware acceleration! Please ensure Intel HAXM is properly installed and usable. CPU acceleration status: HAX kernel module is not installed!

First step to open SDK Manager (In Android Studio, go to Tools > Android > SDK Manager) and Download Intel x86 Emulator Accelerator (HAXM installer) if you haven't as below screen shot:

Now go to your SDK directory C:\users\%USERNAME%\AppData\Local\Android\sdk\extras\intel\Hardware_Accelerated_Execution_Manager\ and run the file named intelhaxm-android.exe. This will almost fix your problem. In case you get an error like "Intel virtualization technology (vt,vt-x) is not enabled". Go to your BIOS settings and enable Hardware Virtualization.

Restart Android Studio and then try to start the AVD again. It might take a minute or 2 to show the emulator window.

Portable GIT > A way to access Git without installing it on Windows

This is the portable edition of Git, click below link to download it from below link provided, a command-line application that helps engineers and designers to keep all versions of a code as well as images or layout, by storing all data in a collection of snapshots taken from a small filesystem. PortableGit-1.9.5-preview20150319

Portability advantages Since there is no installation required, you can just download and extract the archive files to any local hard disk and directly execute Git just clicking on it. There is also the option to save it to a USB flash disk or other removable (temporary) storage unit, in order to launch it on any PC here and there easily and without previous installation. As like most installers we install on windows, Portable Git does not add new entries to the Windows registry or Start menu, thus leaving no traces behind after its removal. Because they are not installed in the system, they are just standalone.

Rich and simple-to-activate commands As Git is a console application, all its options as well as functionalities are accessible from a Command Prompt window. Thus, it is possible to add file contents to the index, locate changes which introduced bugs via binary searches, list, create and delete branches, record changes to the repository, via commit logs, join together two or more development histories, and many others. A user name and email address can be assigned in order to restrict the access of other users.

Extract the contents from an .ISO file without burning the .ISO to disc using third party application

We need it frequently to install ISO image file into our Windows operating system. One way is to burn ISO into USB or DVD. But there is another way, we can extract contents from an ISO file into hard drive using third party tools. Below list of some tools:

IsoBuster Daemon Tools Pismo File Mount or Download from here

First I will demonstrate how we can extract an ISO file using Pismo File Mount. Download Pismo File Mount from above link. then click on an ISO file will show menu as below:

Click on very first option named "Mount" will show a folder with extract files and folders. From there you can find your installation exe file and run to install your desired software. Actually Mounting an ISO file create a virtual drive like below image. You can then Eject that virtual drive by right click on that drive and select "Eject" option from options.