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 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  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  halfW - IMAGE_HALFWIDTH && x  halfH - IMAGE_HALFWIDTH && y 

 public class MainActivity extends AppCompatActivity { Bitmap bp = null; ImageView imageview; float scaleWidth; float scaleHeight; int h; boolean num = false; private Bitmap netfits; @Override protected 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; } } }); } 

 @Override public 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); } } }); }