How to Find specific App Installed in Mobile or Not

In Android sometimes we have to determine that the Specific app is installed in mobile or Not .So here is Code snippet to find the specific package name application installed or not .

 public class MainActivity extends AppCompatActivity {  
   @Override  
   protected void onCreate(Bundle savedInstanceState) {  
     super.onCreate(savedInstanceState);  
     // Add respective layout  
     setContentView(R.layout.main_activity);  
     // Use package name which we want to check  
     boolean isAppInstalled = appInstalledOrNot("com.check.application");  // App package here  
     if(isAppInstalled) {  
       //This intent will help you to launch if the package is already installed  
       Intent LaunchIntent = getPackageManager()  
       .getLaunchIntentForPackage("com.check.application");  
       startActivity(LaunchIntent);  
       Log.i("Application is already installed.");     
     } else {  
       // Do whatever we want to do if application not installed  
       // For example, Redirect to play store  
       Log.i("Application is not currently installed.");  
     }  
   }  
   private boolean appInstalledOrNot(String uri) {  
     PackageManager pm = getPackageManager();  
     try {  
       pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);  
       return true;  
     } catch (PackageManager.NameNotFoundException e) {  
     }  
     return false;  
   }  
 }  

That's All !! Keep coding .