How to check Whatsapp is installed in device in android?

Question

I want to check that whether whatsapp is installed in mobile or not if installed then show toast "installed" and if not installed then show Toast "Not Installed".How can I do that Kindly help.

Answer 1

You can use this code. It will check if package is installed.

public class Example extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //Put the package name here...
        boolean installed = isAppInstalled("com.whatsapp");  
        if(installed) {
            System.out.println("App is already installed on your phone");         
        } else {
            System.out.println("App is not currently installed on your phone");
        }
    }

    private boolean isAppInstalled(String packageName) {
        PackageManager pm = getPackageManager();
        boolean app_installed;
        try {
            pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES);
            app_installed = true;
        }
        catch (PackageManager.NameNotFoundException e) {
            app_installed = false;
        }
        return app_installed;
    }
}

Answer 2

based on @eliasz-kubala answer this will work for me on Android 11 after only adding this to Manifest

  <manifest 
    ...> 
    <queries> <package android:name="com.whatsapp" /> </queries>
  
    <application ....>
    </application>
  </manifest>

and Then use this Kotlin function

  private fun isAppInstalled(packageName: String): Boolean {
    val pm: PackageManager = getPackageManager()
    return try {
        pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES)
        true
    } catch (e: PackageManager.NameNotFoundException) {
        false
    }
   }