Generate the random number

GammaBurst101 · May 20, 2021 · 09a0280 · 09a0280
1 parent 23bd54d
commit 09a0280
Showing 1 changed file with 25 additions and 5 deletions.
diff --git a/app/src/main/java/com/prasoon/randomnumbergenerator/MainActivity.java b/app/src/main/java/com/prasoon/randomnumbergenerator/MainActivity.java
@@ -2,25 +2,45 @@
 
 import androidx.appcompat.app.AppCompatActivity;
 
-import android.content.Context;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.EditText;
+import android.widget.TextView;
 import android.widget.Toast;
 
 public class MainActivity extends AppCompatActivity {
 
+    //Get the required views
+    EditText minTextView;
+    EditText maxTextView;
+    TextView displayView;
+
     public void generateNum(View view){
-        EditText minTextView = (EditText) findViewById(R.id.minValInput);
-        EditText maxTextView = (EditText) findViewById(R.id.maxValInput);
+        try {
+            //Get the values from the input views. Since the views have inputType = int, therefore, we can
+            //be sure that the following method calls will always work
+            int min = Integer.parseInt(minTextView.getText().toString());
+            int max = Integer.parseInt(maxTextView.getText().toString());
 
-        int min = Integer.parseInt(minTextView.getText().toString());
-        int max = Integer.parseInt(maxTextView.getText().toString());
+            //If the input is valid i.e. min < max then generate the random num else display error msg
+            if (min < max) {
+                int randomVal = (int) (Math.random() * (max - min + 1) + min);
+                displayView.setText(Integer.toString(randomVal));
+            } else {
+                Toast.makeText(getApplicationContext(), "Invalid Input: min cannot be greater than max", Toast.LENGTH_LONG).show();
+            }
+        }catch (Exception e){
+            Toast.makeText(getApplicationContext(), "Invalid Input", Toast.LENGTH_SHORT).show();
+        }
     }
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+
+        minTextView = findViewById(R.id.minValInput);
+        maxTextView = findViewById(R.id.maxValInput);
+        displayView = findViewById(R.id.display);
     }
 }