package com.test.myapplication;

import android.graphics.Bitmap;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;

public class MainActivity extends AppCompatActivity {
    private ImageView mQrcodeImage;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mQrcodeImage = (ImageView) findViewById(R.id.qrcodeImage);
        QRCodeWriter writer = new QRCodeWriter();
        try {
            BitMatrix matrix = writer.encode("testtest",
                    BarcodeFormat.QR_CODE, 600, 600);
            mQrcodeImage.setImageBitmap(toBitmap(matrix));
        } catch (WriterException e) {
            e.printStackTrace();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    public Bitmap toBitmap(BitMatrix matrix) {
        int height = matrix.getHeight();
        int width = matrix.getWidth();
        Bitmap bmp = Bitmap
                .createBitmap(width, height, Bitmap.Config.ARGB_8888);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                bmp.setPixel(x, y, matrix.get(x, y) ? Color.BLACK
                        : Color.WHITE);
            }
        }
        return bmp;
    }
}