android最简单的生成二维码demo

首先，上效果图就是这个简单的界面

1.android 有自带的jar包可以生成二维码core-3.0.0.jar，其中的com.google.zxing包

2.写一个二维码生成的工具类，网上搜的话应该一大堆。

package com.example.administrator.twocodedemo;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.PointF;import android.view.Gravity;import android.view.View.MeasureSpec;import android.widget.LinearLayout;import android.widget.LinearLayout.LayoutParams;import android.widget.TextView;import com.google.zxing.BarcodeFormat;import com.google.zxing.EncodeHintType;import com.google.zxing.MultiFormatWriter;import com.google.zxing.WriterException;import com.google.zxing.common.BitMatrix;import com.google.zxing.qrcode.QRCodeWriter;import java.util.Hashtable;/** ** 生成条形码和二维码的工具*/public class ZXingUtils {/** * 生成二维码 要转换的地址或字符串,可以是中文 *  * @param url * @param width * @param height * @return */public static Bitmap createQRImage(String url, final int width, final int height) {try {// 判断URL合法性if (url == null || "".equals(url) || url.length() < 1) {return null;}Hashtable hints = new Hashtable();hints.put(EncodeHintType.CHARACTER_SET, "utf-8");// 图像数据转换，使用了矩阵转换BitMatrix bitMatrix = new QRCodeWriter().encode(url,BarcodeFormat.QR_CODE, width, height, hints);int[] pixels = new int[width * height];// 下面这里按照二维码的算法，逐个生成二维码的图片，// 两个for循环是图片横列扫描的结果for (int y = 0; y < height; y++) {for (int x = 0; x < width; x++) {if (bitMatrix.get(x, y)) {pixels[y * width + x] = 0xff000000;} else {pixels[y * width + x] = 0xffffffff;}}}// 生成二维码图片的格式，使用ARGB_8888Bitmap bitmap = Bitmap.createBitmap(width, height,Bitmap.Config.ARGB_8888);bitmap.setPixels(pixels, 0, width, 0, 0, width, height);return bitmap;} catch (WriterException e) {e.printStackTrace();}return null;}/** * 生成条形码 * * @param context * @param contents *            需要生成的内容 * @param desiredWidth *            生成条形码的宽带 * @param desiredHeight *            生成条形码的高度 * @param displayCode *            是否在条形码下方显示内容 * @return */public static Bitmap creatBarcode(Context context, String contents,  int desiredWidth, int desiredHeight, boolean displayCode) {Bitmap ruseltBitmap = null;/** * 图片两端所保留的空白的宽度 */int marginW = 20;/** * 条形码的编码类型 */BarcodeFormat barcodeFormat = BarcodeFormat.CODE_128;if (displayCode) {Bitmap barcodeBitmap = encodeAsBitmap(contents, barcodeFormat,desiredWidth, desiredHeight);Bitmap codeBitmap = creatCodeBitmap(contents, desiredWidth + 2* marginW, desiredHeight, context);ruseltBitmap = mixtureBitmap(barcodeBitmap, codeBitmap, new PointF(0, desiredHeight));} else {ruseltBitmap = encodeAsBitmap(contents, barcodeFormat,desiredWidth, desiredHeight);}return ruseltBitmap;}/** * 生成条形码的Bitmap * * @param contents *            需要生成的内容 * @param format *            编码格式 * @param desiredWidth * @param desiredHeight * @return * @throws WriterException */protected static Bitmap encodeAsBitmap(String contents,   BarcodeFormat format, int desiredWidth, int desiredHeight) {final int WHITE = 0xFFFFFFFF;final int BLACK = 0xFF000000;MultiFormatWriter writer = new MultiFormatWriter();BitMatrix result = null;try {result = writer.encode(contents, format, desiredWidth,desiredHeight, null);} catch (WriterException e) {// TODO Auto-generated catch blocke.printStackTrace();}int width = result.getWidth();int height = result.getHeight();int[] pixels = new int[width * height];// All are 0, or black, by defaultfor (int y = 0; y < height; y++) {int offset = y * width;for (int x = 0; x < width; x++) {pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;}}Bitmap bitmap = Bitmap.createBitmap(width, height,Bitmap.Config.ARGB_8888);bitmap.setPixels(pixels, 0, width, 0, 0, width, height);return bitmap;}/** * 生成显示编码的Bitmap * * @param contents * @param width * @param height * @param context * @return */protected static Bitmap creatCodeBitmap(String contents, int width,int height, Context context) {TextView tv = new TextView(context);LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);tv.setLayoutParams(layoutParams);tv.setText(contents);tv.setHeight(height);tv.setGravity(Gravity.CENTER_HORIZONTAL);tv.setWidth(width);tv.setDrawingCacheEnabled(true);tv.setTextColor(Color.BLACK);tv.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));tv.layout(0, 0, tv.getMeasuredWidth(), tv.getMeasuredHeight());tv.buildDrawingCache();Bitmap bitmapCode = tv.getDrawingCache();return bitmapCode;}/** * 将两个Bitmap合并成一个 *  * @param first * @param second * @param fromPoint *            第二个Bitmap开始绘制的起始位置（相对于第一个Bitmap） * @return */protected static Bitmap mixtureBitmap(Bitmap first, Bitmap second,  PointF fromPoint) {if (first == null || second == null || fromPoint == null) {return null;}int marginW = 20;Bitmap newBitmap = Bitmap.createBitmap(first.getWidth() + second.getWidth() + marginW,first.getHeight() + second.getHeight(), Config.ARGB_4444);Canvas cv = new Canvas(newBitmap);cv.drawBitmap(first, marginW, 0, null);cv.drawBitmap(second, fromPoint.x, fromPoint.y, null);cv.save(Canvas.ALL_SAVE_FLAG);cv.restore();return newBitmap;}}

准备工作完成，现在可以在用到的地方使用，我们这里就在MainActivity中

package com.example.administrator.twocodedemo;import android.graphics.Bitmap;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.ImageView;import butterknife.BindView;import butterknife.ButterKnife;import butterknife.OnClick;public class MainActivity extends AppCompatActivity {    @BindView(R.id.et_url)    EditText etUrl;    @BindView(R.id.btn_create)    Button btnCreate;    @BindView(R.id.iv_two_code)    ImageView ivTwoCode;    private String imagePath;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ButterKnife.bind(this);    }    @OnClick({R.id.btn_create, R.id.iv_two_code})    public void onClick(View view) {        switch (view.getId()) {            case R.id.btn_create:                String url = etUrl.getText().toString().trim();                Bitmap bitmap = ZXingUtils.createQRImage(url, ivTwoCode.getWidth(), ivTwoCode.getHeight());                ivTwoCode.setImageBitmap(bitmap);

这其中使用了Butterknife注解工具，其中真正的代码就两句：

Bitmap bitmap = ZXingUtils.createQRImage(url, ivTwoCode.getWidth(), ivTwoCode.getHeight());                ivTwoCode.setImageBitmap(bitmap);

简单吗？

最后附上资源地址点击打开链接

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