Android Zxing生成二维码经典案例分享

public class QRCode {private static int IMAGE_HALFWIDTH = 50;//宽度值，影响中间图片大小/** * 生成二维码，默认大小为500*500 * * @return bitmap */public static Bitmap createQRCode() { return createQRCode();}/** * 生成二维码，默认大小为500*500 * * @param text 需要生成二维码的文字、网址等 * @return bitmap */public static Bitmap createQRCode(String text) { return createQRCode(text, 500);}/** * 生成二维码 * * @param text 需要生成二维码的文字、网址等 * @param size 需要生成二维码的大小（） * @return bitmap */public static Bitmap createQRCode(String text, int size) { try {  Hashtable<EncodeHintType, String> hints = new Hashtable<>();  hints.put(EncodeHintType.CHARACTER_SET, "utf-8");  BitMatrix bitMatrix = new QRCodeWriter().encode(text,    BarcodeFormat.QR_CODE, size, size, hints);  int[] pixels = new int[size * size];  for (int y = 0; y < size; y++) {   for (int x = 0; x < size; x++) {    if (bitMatrix.get(x, y)) {     pixels[y * size + x] = 0xff000000;    } else {     pixels[y * size + x] = 0xffffffff;    }   }  }  Bitmap bitmap = Bitmap.createBitmap(size, size,    Bitmap.Config.ARGB_8888);  bitmap.setPixels(pixels, 0, size, 0, 0, size, size);  return bitmap; } catch (WriterException e) {  e.printStackTrace();  return null; }}/** * 生成带logo的二维码，默认二维码的大小为500，logo为二维码的1/5 * * @param text 需要生成二维码的文字、网址等 * @param mBitmap logo文件 * @return bitmap */public static Bitmap createQRCodeWithLogo(String text, Bitmap mBitmap) { return createQRCodeWithLogo(text,500,mBitmap);}/** * 生成带logo的二维码，logo默认为二维码的1/5 * * @param text 需要生成二维码的文字、网址等 * @param size 需要生成二维码的大小（） * @param mBitmap logo文件 * @return bitmap */public static Bitmap createQRCodeWithLogo(String text, int size, Bitmap mBitmap) { try {  IMAGE_HALFWIDTH = size/10;  Hashtable<EncodeHintType, Object> hints = new Hashtable<>();  hints.put(EncodeHintType.CHARACTER_SET, "utf-8");  /*   * 设置容错级别，默认为ErrorCorrectionLevel.L   * 因为中间加入logo所以建议你把容错级别调至H,否则可能会出现识别不了   */  hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);  BitMatrix bitMatrix = new QRCodeWriter().encode(text,    BarcodeFormat.QR_CODE, size, size, hints);  int width = bitMatrix.getWidth();//矩阵高度  int height = bitMatrix.getHeight();//矩阵宽度  int halfW = width / 2;  int halfH = height / 2;  Matrix m = new Matrix();  float sx = (float) 2 * IMAGE_HALFWIDTH / mBitmap.getWidth();  float sy = (float) 2 * IMAGE_HALFWIDTH    / mBitmap.getHeight();  m.setScale(sx, sy);  //设置缩放信息  //将logo图片按martix设置的信息缩放  mBitmap = Bitmap.createBitmap(mBitmap, 0, 0,    mBitmap.getWidth(), mBitmap.getHeight(), m, false);  int[] pixels = new int[size * size];  for (int y = 0; y < size; y++) {   for (int x = 0; x < size; x++) {    if (x > halfW - IMAGE_HALFWIDTH && x < halfW + IMAGE_HALFWIDTH      && y > halfH - IMAGE_HALFWIDTH      && y < halfH + IMAGE_HALFWIDTH) {     //该位置用于存放图片信息     //记录图片每个像素信息     pixels[y * width + x] = mBitmap.getPixel(x - halfW       + IMAGE_HALFWIDTH, y - halfH + IMAGE_HALFWIDTH);    } else {     if (bitMatrix.get(x, y)) {      pixels[y * size + x] = 0xff000000;     } else {      pixels[y * size + x] = 0xffffffff;     }    }   }  }  Bitmap bitmap = Bitmap.createBitmap(size, size,    Bitmap.Config.ARGB_8888);  bitmap.setPixels(pixels, 0, size, 0, 0, size, size);  return bitmap; } catch (WriterException e) {  e.printStackTrace();  return null; }}

public class MainActivity extends AppCompatActivity { Bitmap bp = null; ImageView imageview; float scaleWidth; float scaleHeight; int h; boolean num = false; private Bitmap netfits;@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); DisplayMetrics dm = new DisplayMetrics();//创建矩阵 getWindowManager().getDefaultDisplay().getMetrics(dm); imageview = (ImageView) findViewById(R.id.imageview); bp= BitmapFactory.decodeResource(getResources(),R.drawable.icon); netfits = QRCode.createQRCodeWithLogo("张",200,bp); int width = netfits.getWidth(); int height = netfits.getHeight(); int w = dm.widthPixels; //得到屏幕的宽度 final int h = dm.heightPixels; //得到屏幕的高度 scaleWidth = ((float) w) / width; scaleHeight = ((float) w) / height; imageview.setImageBitmap(netfits); imageview.setOnClickListener(new View.OnClickListener() {  @Override  public void onClick(View view) {   if (num == true) {    Matrix matrix = new Matrix();    matrix.postScale(scaleWidth, scaleHeight);    Bitmap newBitmap = Bitmap.createBitmap(netfits, 0, 0, netfits.getWidth(), netfits.getHeight(), matrix, true);    imageview.setImageBitmap(newBitmap);    num = false;   } else {    Matrix matrix = new Matrix();    matrix.postScale(1.0f, 1.0f);    Bitmap newBitmap = Bitmap.createBitmap(netfits, 0, 0, netfits.getWidth(), netfits.getHeight(), matrix, true);    imageview.setImageBitmap(newBitmap);    num = true;   }  } });}

@Overridepublic boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) {  case MotionEvent.ACTION_DOWN: //当屏幕检测到第一个触点按下之后就会触发到这个事件。   if (num == true) {    Matrix matrix = new Matrix();    matrix.postScale(scaleWidth, scaleHeight);    Bitmap newBitmap = Bitmap.createBitmap(netfits, 0, 0, netfits.getWidth(), netfits.getHeight(), matrix, true);    imageview.setImageBitmap(newBitmap);    num = false;   } else {    Matrix matrix = new Matrix();    matrix.postScale(1.0f, 1.0f);    Bitmap newBitmap = Bitmap.createBitmap(netfits, 0, 0, netfits.getWidth(), netfits.getHeight(), matrix, true);    imageview.setImageBitmap(newBitmap);    num = true;   }   break; } return super.onTouchEvent(event);}

private void initView() { editText = (EditText) this.findViewById(R.id.qrcode_et); button = (Button) this.findViewById(R.id.qrcode_bt); imageView = (ImageView) this.findViewById(R.id.qrcode_iv); cb = (CheckBox) this.findViewById(R.id.qrcode_cb); button.setOnClickListener(new View.OnClickListener() {  @Override  public void onClick(View view) {   if (cb.isChecked()){    Bitmap bitmap = QRCode.createQRCodeWithLogo(editText.getText().toString(), 500,      BitmapFactory.decodeResource(getResources(),R.drawable.logo_me));    imageView.setImageBitmap(bitmap);   }else{    Bitmap bitmap = QRCode.createQRCode(editText.getText().toString(), 500);    imageView.setImageBitmap(bitmap);   }  } });}