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_8888
			Bitmap 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 block
			e.printStackTrace();
		}

		int width = result.getWidth();
		int height = result.getHeight();
		int[] pixels = new int[width * height];
		// All are 0, or black, by default
		for (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