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Feb 17th, 2019
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Java 1.26 KB | None | 0 0
  1. package com.example.mycalc;
  2.  
  3.  
  4. import android.os.Bundle;
  5. import android.support.v7.app.AppCompatActivity;
  6. import android.view.View;
  7. import android.widget.Button;
  8. import android.widget.EditText;
  9. import android.widget.TextView;
  10.  
  11. import static java.lang.Integer.parseInt;
  12.  
  13. public class MainActivity extends AppCompatActivity {
  14.  
  15.     @Override
  16.     protected void onCreate(Bundle savedInstanceState) {
  17.         super.onCreate(savedInstanceState);
  18.         setContentView(R.layout.activity_main);
  19.  
  20.         // Connect button
  21.         Button calcButton = findViewById(R.id.calcButton);
  22.  
  23.         calcButton.setOnClickListener(new View.OnClickListener() {
  24.             @Override
  25.             public void onClick(View view) {
  26.  
  27.                 // Initialize text-fields
  28.                 EditText assignmentOneInput = findViewById(R.id.assignmentOne);
  29.          
  30.                 // Convert integers to strings
  31.                 int fieldOne = Integer.parseInt(assignmentOneInput.getText().toString());
  32.                
  33.                 // Form validation
  34.                 if (!TextUtils.isEmpty(assignmentOneInput.getText().toString()) || fieldOne>100)) {
  35.                     assignmentOneInput.setError("Please enter a number between 0 and 100.");
  36.                 }
  37.     }
  38. }
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