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package com.example.program1; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.text.Editable; import android.text.TextWatcher; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.Toast; public class MainActivity extends AppCompatActivity { private EditText editTextName, editTextSurname, editTextGrades; private Button buttonGrades; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); editTextName = findViewById(R.id.editTextName); editTextSurname = findViewById(R.id.editTextSurname); editTextGrades = findViewById(R.id.editNumberOfGrades); buttonGrades = findViewById(R.id.buttonGrades); editTextName.addTextChangedListener(namechange); editTextSurname.addTextChangedListener(surnamechange); editTextGrades.addTextChangedListener(gradeschange); editTextName.addTextChangedListener(buttonvisible); editTextSurname.addTextChangedListener(buttonvisible); editTextGrades.addTextChangedListener(buttonvisible); editTextName.setOnFocusChangeListener(new View.OnFocusChangeListener() { @Override public void onFocusChange(View view, boolean b) { String name = editTextName.getText().toString().trim(); if(!b && name.isEmpty()){ Toast.makeText(MainActivity.this, getString(R.string.name_statement), Toast.LENGTH_SHORT).show(); editTextName.setError(getString(R.string.name_statement)); } } }); editTextSurname.setOnFocusChangeListener(new View.OnFocusChangeListener() { @Override public void onFocusChange(View view, boolean b) { String surname = editTextSurname.getText().toString().trim(); if(!b && surname.isEmpty()){ Toast.makeText(MainActivity.this, getString(R.string.surname_statement), Toast.LENGTH_SHORT).show(); editTextSurname.setError(getString(R.string.surname_statement)); } } }); editTextGrades.setOnFocusChangeListener(new View.OnFocusChangeListener() { @Override public void onFocusChange(View view, boolean b) { String numberOfGrades = editTextGrades.getText().toString().trim(); int amount; if(numberOfGrades.isEmpty()){ amount = 0; } else{ amount = Integer.parseInt(numberOfGrades); } if(!b && (amount < 5 || amount > 15)){ Toast.makeText(MainActivity.this, getString(R.string.grades_statement), Toast.LENGTH_SHORT).show(); editTextGrades.setError(getString(R.string.grades_statement)); } } }); } public TextWatcher namechange = new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { } @Override public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { if(charSequence.length() == 0){ editTextName.setError(getString(R.string.name_statement)); buttonGrades.setVisibility(View.INVISIBLE); } } @Override public void afterTextChanged(Editable editable) { } }; public TextWatcher surnamechange = new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { } @Override public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { if(charSequence.length() == 0){ editTextSurname.setError(getString(R.string.surname_statement)); buttonGrades.setVisibility(View.INVISIBLE); } } @Override public void afterTextChanged(Editable editable) { } }; public TextWatcher gradeschange = new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { } @Override public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { if(charSequence.length() == 0 || Integer.parseInt(charSequence.toString()) < 5 || Integer.parseInt(charSequence.toString()) > 15){ editTextGrades.setError(getString(R.string.grades_statement)); buttonGrades.setVisibility(View.INVISIBLE); } } @Override public void afterTextChanged(Editable editable) { } }; public TextWatcher buttonvisible = new TextWatcher() { @Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { } @Override public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { String name = editTextName.getText().toString().trim(); String surname = editTextSurname.getText().toString().trim(); String numberOfGrades = editTextGrades.getText().toString().trim(); if (!name.isEmpty() && !surname.isEmpty() && !numberOfGrades.isEmpty() && Integer.parseInt(numberOfGrades) >= 5 && Integer.parseInt(numberOfGrades) <= 15){ buttonGrades.setVisibility(View.VISIBLE); } else{ buttonGrades.setVisibility(View.INVISIBLE); } } @Override public void afterTextChanged(Editable editable) { } }; }
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