二维码程序生成

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添加依赖：compile files('libs/zxing.jar')        compile 'com.yanzhenjie:permission:1.0.5'        在libs中导入Zxing.jar包

在Values中创建dimens.xml文件

<?xml version="1.0" encoding="utf-8"?><resources>    <!-- Default screen margins, per the Android Design guidelines. -->    <dimen name="activity_horizontal_margin">16dp</dimen>    <dimen name="activity_vertical_margin">16dp</dimen></resources>

创建布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.exbway.erweima.MainActivity">    <Button        android:id="@+id/button1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="生成二维码"        />    <Button        android:id="@+id/button2"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="自定义生成二维码"        />    <ImageView        android:id="@+id/iv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"/></LinearLayout>

Main方法

package com.exbway.erweima;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;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;import java.util.HashMap;import java.util.Map;public class MainActivity extends AppCompatActivity implements View.OnClickListener{    private ImageView iv;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Button button1 = (Button) findViewById(R.id.button1);        Button button2 = (Button) findViewById(R.id.button2);        iv = (ImageView) findViewById(R.id.iv);        button1.setOnClickListener(this);        button2.setOnClickListener(this);    }    @Override    public void onClick(View v) {        Bitmap bitmap = null;        switch (v.getId()) {            case R.id.button1:                //生成二维码                bitmap = generateBitmap("内容。。。自定义", 400, 400);                iv.setImageBitmap(bitmap);                break;            case R.id.button2:                //生成自定义的二维码                //先生成二维码                bitmap = generateBitmap("内容。。。自定义", 400, 400);                //添加logo                //先得到一个logo图标                Bitmap logoBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.ab);                //把logo添加到二维码上                Bitmap customBitmap = addLogo(bitmap, logoBitmap);                iv.setImageBitmap(customBitmap);                break;        }    }    //生成二维码    private Bitmap generateBitmap(String content, int width, int height) {        QRCodeWriter qrCodeWriter = new QRCodeWriter();        Map<EncodeHintType, String> hints = new HashMap<>();        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");        try {            BitMatrix encode = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, width, height);            int[] pixels = new int[width * height];            for (int i = 0; i < height; i++) {                for (int j = 0; j < width; j++) {                    if (encode.get(j, i)) {                        pixels[i * width + j] = 0x00000000;                    } else {                        pixels[i * width + j] = 0xffffffff;                    }                }            }            return Bitmap.createBitmap(pixels, 0, width, width, height, Bitmap.Config.RGB_565);        } catch (WriterException e) {            e.printStackTrace();        }        return null;    }    /**     * 添加图标     *     * @param qrBitmap     * @param logoBitmap     * @return     */    private Bitmap addLogo(Bitmap qrBitmap, Bitmap logoBitmap) {        int qrBitmapWidth = qrBitmap.getWidth();        int qrBitmapHeight = qrBitmap.getHeight();        int logoBitmapWidth = logoBitmap.getWidth();        int logoBitmapHeight = logoBitmap.getHeight();        Bitmap blankBitmap = Bitmap.createBitmap(qrBitmapWidth, qrBitmapHeight, Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(blankBitmap);        canvas.drawBitmap(qrBitmap, 0, 0, null);        canvas.save(Canvas.ALL_SAVE_FLAG);        float scaleSize = 1.0f;        while ((logoBitmapWidth / scaleSize) > (qrBitmapWidth / 5) || (logoBitmapHeight / scaleSize) > (qrBitmapHeight / 5)) {            scaleSize *= 2;        }        float sx = 1.0f / scaleSize;        canvas.scale(sx, sx, qrBitmapWidth / 2, qrBitmapHeight / 2);        canvas.drawBitmap(logoBitmap, (qrBitmapWidth - logoBitmapWidth) / 2, (qrBitmapHeight - logoBitmapHeight) / 2, null);        canvas.restore();        return blankBitmap;    }}

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