生成二维码的Android应用-优快云博客

将输入的文字，生成相应的二维码。
这个需要个zxing.jar包
代码还是比较简单的。
xml文件中只需要三个控件，一个输入框，一个按钮，一个ImageView，这个里面放二维码。
看下面代码。

package com.example.day0215;


import java.util.Hashtable;

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

import android.app.Activity;
import android.graphics.Bitmap;
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;



public class MainActivity extends Activity {

    private EditText et01;
    private Button bt01;
    private ImageView qr_image;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et01=(EditText) findViewById(R.id.editText1);
        bt01=(Button) findViewById(R.id.button1);
        qr_image=(ImageView) findViewById(R.id.imageView1);
        bt01.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                    QRCodeWriter writer=new QRCodeWriter();
                    String text = et01.getText().toString();
                    if(text==null||text.length()<1){
                        return;
                    }
                    try {
                        //把输入的文本转为二维码
                        BitMatrix bitMatrix=writer.encode(text, BarcodeFormat.QR_CODE, 200, 200);
                        System.out.println("w:"+bitMatrix.getWidth()+"h:"+bitMatrix.getHeight());
                        Hashtable<EncodeHintType, String> hints=new Hashtable<EncodeHintType, String>();
                        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
                        BitMatrix bitMatrix2=new QRCodeWriter().encode(text, BarcodeFormat.QR_CODE,200,200,hints);
                          int[] pixels = new int[200* 200];
                            for (int y = 0; y < 200; y++) {
                                for (int x = 0; x < 200; x++) {
                                    if (bitMatrix.get(x, y)) {
                                        pixels[y * 200 + x] = 0xff000000;
                                    } else {
                                        pixels[y * 200 + x] = 0xffffffff;
                                    }
                                }
                            }
                            Bitmap bitmap = Bitmap.createBitmap(200, 200,
                                    Bitmap.Config.ARGB_8888);

                            bitmap.setPixels(pixels, 0, 200, 0, 0, 200, 200);
                            qr_image.setImageBitmap(bitmap);

                        } catch (WriterException e) {
                            e.printStackTrace();
                        }

            }
        });
            }



}