android最简单的生成二维码demo
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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。
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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<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();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;}}
来自CODE的代码片ZXingUtils
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);
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。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213
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<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();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;}}
来自CODE的代码片ZXingUtils
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);
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