MainActivity.java

package com.example.autofittextviewsample;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.Editable;
import android.text.TextUtils.TruncateAt;
import android.text.TextWatcher;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.ViewTreeObserver.OnPreDrawListener;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;

import com.lb.auto_fit_textview.AutoResizeTextView;

public class MainActivity extends AppCompatActivity {
    // private final Random _random =new Random();
    // private static final String ALLOWED_CHARACTERS ="qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM1234567890";
    private EditText _contentEditText;
    private ViewGroup _textViewcontainer;
    private SeekBar _widthSeekBar;
    private SeekBar _heightSeekBar;
    private TextView _linesCountTextView;

    @Override
    protected void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        _textViewcontainer = (ViewGroup) findViewById(R.id.container);
        _contentEditText = (EditText) findViewById(R.id.contentEditText);
        _contentEditText.addTextChangedListener(new TextWatcher() {
            @Override
            public void onTextChanged(final CharSequence s, final int start, final int before, final int count) {
            }

            @Override
            public void beforeTextChanged(final CharSequence s, final int start, final int count, final int after) {
            }

            @Override
            public void afterTextChanged(final Editable s) {
                recreateTextView();
            }
        });
        _widthSeekBar = (SeekBar) findViewById(R.id.widthSeekBar);
        _heightSeekBar = (SeekBar) findViewById(R.id.heightSeekBar);
        final OnSeekBarChangeListener seekBarChangeListener = new OnSeekBarChangeListener() {
            @Override
            public void onStopTrackingTouch(final SeekBar seekBar) {
            }

            @Override
            public void onStartTrackingTouch(final SeekBar seekBar) {
            }

            @Override
            public void onProgressChanged(final SeekBar seekBar, final int progress, final boolean fromUser) {
                recreateTextView();
            }
        };
        _heightSeekBar.setOnSeekBarChangeListener(seekBarChangeListener);
        _widthSeekBar.setOnSeekBarChangeListener(seekBarChangeListener);
        _linesCountTextView = (TextView) findViewById(R.id.linesCountTextView);
        findViewById(R.id.plusLineCountButton).setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(final View v) {
                int maxLinesCount = Integer.parseInt(_linesCountTextView.getText().toString());
                _linesCountTextView.setText(Integer.toString(++maxLinesCount));
                recreateTextView();
            }
        });
        findViewById(R.id.minusLineCountButton).setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(final View v) {
                int maxLinesCount = Integer.parseInt(_linesCountTextView.getText().toString());
                if (maxLinesCount == 1)
                    return;
                _linesCountTextView.setText(Integer.toString(--maxLinesCount));
                recreateTextView();
            }
        });
        runJustBeforeBeingDrawn(_textViewcontainer, new Runnable() {
            @Override
            public void run() {
                recreateTextView();
            }
        });


    }

    protected void recreateTextView() {
        _textViewcontainer.removeAllViews();
        final int maxWidth = _textViewcontainer.getWidth();
        final int maxHeight = _textViewcontainer.getHeight();
        final AutoResizeTextView textView = new AutoResizeTextView(MainActivity.this);
        textView.setGravity(Gravity.CENTER);
        final int width = _widthSeekBar.getProgress() * maxWidth / _widthSeekBar.getMax();
        final int height = _heightSeekBar.getProgress() * maxHeight / _heightSeekBar.getMax();
        final int maxLinesCount = Integer.parseInt(_linesCountTextView.getText().toString());
        textView.setMaxLines(maxLinesCount);
        textView.setTextSize(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, maxHeight, getResources().getDisplayMetrics()));
        textView.setEllipsize(TruncateAt.END);
        // since we use it only once per each click, we don't need to cache the results, ever
        textView.setLayoutParams(new LayoutParams(width, height));
        textView.setBackgroundColor(0xff00ff00);
        final String text = _contentEditText.getText().toString();
        textView.setText(text);
        _textViewcontainer.addView(textView);
    }

    // private String getRandomText()
    // {
    // final int textLength=_random.nextInt(20)+1;
    // final StringBuilder builder=new StringBuilder();
    // for(int i=0;i<textLength;++i)
    // builder.append(ALLOWED_CHARACTERS.charAt(_random.nextInt(ALLOWED_CHARACTERS.length())));
    // return builder.toString();
    // }
    @Override
    public boolean onCreateOptionsMenu(final Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(final MenuItem item) {
        String url = null;
        switch (item.getItemId()) {
            case R.id.menuItem_all_my_apps:
                url = "https://play.google.com/store/apps/developer?id=AndroidDeveloperLB";
                break;
            case R.id.menuItem_all_my_repositories:
                url = "https://github.com/AndroidDeveloperLB";
                break;
            case R.id.menuItem_current_repository_website:
                url = "https://github.com/AndroidDeveloperLB/AutoFitTextView";
                break;
            case R.id.menuItem_show_recyclerViewSample:
                startActivity(new Intent(this, Main2Activity.class));
                return true;
        }
        if (url == null)
            return true;
        final Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
        intent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY | Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
        startActivity(intent);
        return true;
    }

    public static void runJustBeforeBeingDrawn(final View view, final Runnable runnable) {
        final OnPreDrawListener preDrawListener = new OnPreDrawListener() {
            @Override
            public boolean onPreDraw() {
                runnable.run();
                view.getViewTreeObserver().removeOnPreDrawListener(this);
                return true;
            }
        };
        view.getViewTreeObserver().addOnPreDrawListener(preDrawListener);
    }
}