Android實現帶logo的二維碼

<ImageView
    android:id="@+id/code"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
    android:text="@string/hello_world" />

</RelativeLayout></pre>

MainActivity

package com.example;

import java.util.Hashtable;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.os.Bundle;
import android.widget.ImageView;
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;
public class MainActivity extends Activity {
    private ImageView code;
    private final int  QR_WIDTH=300;
    private final int  QR_HEIGHT=300;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  code=(ImageView) findViewById(R.id.code);
  createImage("weixin") ;
 }
 // 生成QR圖
    private void createImage(String text) {
        try {
            // 需要引入core包
            QRCodeWriter writer = new QRCodeWriter();
            // 把輸入的文本轉為二維碼
            BitMatrix martix = writer.encode(text, BarcodeFormat.QR_CODE,
                    QR_WIDTH, QR_HEIGHT);

     //圖像數據轉換，使用了矩陣轉換
    Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        BitMatrix bitMatrix = new QRCodeWriter().encode(text,
                BarcodeFormat.QR_CODE, QR_WIDTH, QR_HEIGHT, hints);
        int[] pixels = new int[QR_WIDTH * QR_HEIGHT];
        for (int y = 0; y < QR_HEIGHT; y++) {


//下面這里按照二維碼的算法，逐個生成二維碼的圖片，//兩個for循環是圖片橫列掃描的結果
                for (int x = 0; x < QR_WIDTH; x++) {
                    if (bitMatrix.get(x, y)) {
                        pixels[y  QR_WIDTH + x] = 0xff000000;//黑色
                    } else {
                        pixels[y  QR_WIDTH + x] = 0xffffffff;//白色
                    }

            }
        }
  //------------------添加圖片部分------------------//

Bitmap logoBmp = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
            Bitmap bitmap = Bitmap.createBitmap(QR_WIDTH, QR_HEIGHT,
                    Bitmap.Config.ARGB_8888);
//設置像素點

        bitmap.setPixels(pixels, 0, QR_WIDTH, 0, 0, QR_WIDTH, QR_HEIGHT);

        Canvas canvas = new Canvas(bitmap);
     //二維碼
     canvas.drawBitmap(bitmap, 0,0, null);
     //圖片繪制在二維碼中央，合成二維碼圖片

canvas.drawBitmap(logoBmp, bitmap.getWidth() / 2

 - logoBmp.getWidth() / 2, bitmap.getHeight()
 / 2 - logoBmp.getHeight() / 2, null);

//------------------添加logo部分------------------//
            code.setImageBitmap(bitmap);

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


}
</pre>