二维码的生成与解析(一)

本示例演示使用文本生成对应的二维码图片，和解析二维码图片的内容。代码如下：

MainActivity：

package com.home.testqrcode;

import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.Result;
import com.google.zxing.WriterException;
import com.google.zxing.client.androidtest.RGBLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.QRCodeReader;
import com.google.zxing.qrcode.QRCodeWriter;

public class MainActivity extends Activity implements OnClickListener {
	private Button generateBtn;
	private Button decodeQRCodeBtn;
	private ImageView imageView;
	private TextView textView;
	private EditText contentText;
	private static int QR_WIDTH = 400;
	private static int QR_HEIGHT = 400;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		initWidget();
	}

	private void initWidget() {
		generateBtn = (Button) findViewById(R.id.main_btn_generateQRCode);
		generateBtn.setOnClickListener(this);
		decodeQRCodeBtn = (Button) findViewById(R.id.main_btn_decodeQRCode);
		decodeQRCodeBtn.setOnClickListener(this);
		imageView = (ImageView) findViewById(R.id.main_iv);
		textView = (TextView) findViewById(R.id.main_tv);
		contentText = (EditText) findViewById(R.id.main_et);
	}

	@Override
	public void onClick(View v) {
		if (v == generateBtn) {
			String text = contentText.getText().toString();
			if ("".equals(text) || null == text) {
				Toast.makeText(this, "请输入内容", Toast.LENGTH_SHORT).show();
				return;
			}
			Bitmap bitmap = createBitmap(text);
			if (bitmap != null) {
				imageView.setImageBitmap(bitmap);
			}
		} else if (v == decodeQRCodeBtn) {
			String content = readImage(imageView);
			textView.setText(content);
		}
	}

	/**
	 * 生成二维码图片
	 * 
	 * @return
	 */
	private Bitmap createBitmap(String text) {
		Bitmap bitmap = null;
		try {
			Hashtable
  






    hints = new Hashtable
   
    (); hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); BitMatrix bitMatrix = new QRCodeWriter().encode(text, BarcodeFormat.QR_CODE, QR_WIDTH, QR_HEIGHT, hints); // QRCodeWriter writer = new QRCodeWriter(); // // 把输入的文本转为二维码 // BitMatrix bitMatrix = writer.encode(text, BarcodeFormat.QR_CODE, // QR_WIDTH, QR_HEIGHT); int[] pixels = new int[QR_WIDTH * QR_HEIGHT]; for (int y = 0; y < QR_HEIGHT; y++) { for (int x = 0; x < QR_WIDTH; x++) { if (bitMatrix.get(x, y)) { pixels[y * QR_WIDTH + x] = 0xff000000; } else { pixels[y * QR_WIDTH + x] = 0xffffffff; } } } bitmap = Bitmap.createBitmap(QR_WIDTH, QR_HEIGHT, Bitmap.Config.ARGB_8888); bitmap.setPixels(pixels, 0, QR_WIDTH, 0, 0, QR_WIDTH, QR_HEIGHT); } catch (WriterException e) { e.printStackTrace(); } return bitmap; } /** * 解析QR图内容 * * @param imageView * @return */ private String readImage(ImageView imageView) { String content = null; Map
    
      hints = new HashMap
     
      (); hints.put(DecodeHintType.CHARACTER_SET, "utf-8"); // 获得待解析的图片 Bitmap bitmap = ((BitmapDrawable) imageView.getDrawable()).getBitmap(); RGBLuminanceSource source = new RGBLuminanceSource(bitmap); BinaryBitmap bitmap1 = new BinaryBitmap(new HybridBinarizer(source)); QRCodeReader reader = new QRCodeReader(); try { Re