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Keytool is not recognized as internal or extenal command / Adding PATH in system variable

If you are running a keytool command  keytool -list -v -keystore C:\Users\arun\.android\debug.keystore -alias androiddebugkey -storepass android    and getting an error   'keytool' is not recognized as an internal or external command  If you are using any other commad like java,javac , etc.. and getting an error " is not recognized as an internal or external command"  you can also use this same steps  you are getting this error because keytool.exe , executable file which exists in the bin directory of your JDK  is not added to Path in your Environmental variables. To resolve this issue 1 .first we need to find the bin Directory of our jdk    Usually this will be in  C:\Program Files\Java\jre1.8.0_221\bin (jre1.8.0_221 - change this to your latest version , ). you can see keytool.exe file in the bin directory . (If you installed jdk in a different directory Find your Jdk installation folder and  use that path....
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Simple Calculator in Android

You can view new updated simple calculator with ViemModel and LiveData in my new blog    https://androidtuts4u.blogspot.com/2021/10/simple-calculator-with-viewmodel-and.html To create a calculator first  we need to create the layout of the calculator. Layout  is created  using XML file given below <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent" >  <EditText     android:id="@+id/result_id"       android:layout_width="fill_parent"     android:layout_height="120dp"   />  <Button    android:id="@+id/Btn7_id"      android:layout_width="70dp"    android:layout_height="60dp"    android:layout_below="@id/result_id"   ...
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How to Open Android Emulator form Command Line and install Apk in Emulator

  You can also view this on my youtube channel How to Open Android Emulator from Commad Line 1.Open Command line 2.Change working directory to android sdk directory    cd  appdata/local/android/sdk/emulator 3.List all available Android virtual devices     emulator -list-avds 4. All your avds will be shown choose the avd_name you want to open    emulator -avd avd_name   5.Your Android virtual device will open up How to install APk file to emulator Drag the APK to Android emulator it will install automatically
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