MainActivity for the Anagram Finder App on SSaurel's Blog

MainActivity.java

package com.ssaurel.myanagram;

import android.app.Dialog;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import java.util.List;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;

public class MainActivity extends AppCompatActivity {

 @BindView(R.id.input)
 EditText input;
 @BindView(R.id.validate)
 Button validate;
 @BindView(R.id.result)
 TextView result;
 private Dialog waitDialog;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  ButterKnife.bind(this);
  // we disable validate button because words are not loaded from assets
  validate.setEnabled(Anagram.isLoaded());

  // we need to load words from assets
  loadWords();
 }

 private void loadWords() {
  new Thread(() -> {
   Anagram.loadWords(MainActivity.this);

   runOnUiThread(() -> {
    validate.setEnabled(Anagram.isLoaded());
   });
  }).start();
 }

 @OnClick(R.id.validate)
 public void validate(View v) {
  String text = input.getText().toString();

  if (text != null) {
   final String text2 = text.trim();

   if (!"".equals(text2)) {
    showWaitDialog(); // wait dialog for user

    new Thread(() -> {
     final List < String > words = Anagram.listWords(text); // we search anagrams for entered letters in separate thread

     runOnUiThread(() -> {
      hideWaitDialog();
      // we display results
      displayResult(words);
     });
    }).start();

   }
  }
 }

 private void showWaitDialog() {
  waitDialog = new AlertDialog.Builder(this).setMessage("Wait").create();
 }

 private void hideWaitDialog() {
  waitDialog.dismiss();
 }

 private void displayResult(List < String > words) {
  if (words.isEmpty()) {
   result.setText("NO RESULT");
  } else {
   StringBuilder sb = new StringBuilder();

   for (String word: words) {
    sb.append(word).append("\n");
   }

   result.setText(sb);
  }
 }

}