Android应用开发:生成二维码
发布时间:2020-12-14 23:50:07 所属栏目:Java 来源:网络整理
导读:今天PHP站长网 52php.cn把收集自互联网的代码分享给大家,仅供参考。 LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:sample="http://schemas.android.com/apk/res-auto" android:layou
以下代码由PHP站长网 52php.cn收集自互联网 现在PHP站长网小编把它分享给大家,仅供参考 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:sample="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#dadada" android:focusable="true" android:focusableInTouchMode="true" android:orientation="vertical" > <ImageView android:id="@+id/qr_show" android:layout_gravity="center_horizontal" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="55dp" android:scaleType="fitXY" android:background="@null" android:src="@drawable/default_pic" /> </LinearLayout> public class MyQrActivity extends Activity { private ImageView qr_show; private SampleListLinearLayout lv_record; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_qr_layout); initViews(); } protected void initViews() { qr_show = (ImageView) findViewById(R.id.qr_show); DisplayMetrics outMetrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(outMetrics); int w = outMetrics.widthPixels * 8 / 11;//设置宽度 ViewGroup.LayoutParams layoutParams = qr_show.getLayoutParams(); layoutParams.height = layoutParams.width = w;//设置高度 qr_show.setLayoutParams(layoutParams); try { Bitmap bitmap = QRUtils.encodeToQRWidth("http://write.blog.csdn.net/",w);//要生成二维码的内容,我这就是一个网址 qr_show.setImageBitmap(bitmap); } catch (Exception e) { e.printStackTrace(); Toast.makeText(this,"生成二维码失败",Toast.LENGTH_SHORT); } } } public class QRUtils { private static final int WHITE = 0xFFFFFFFF; private static final int BLACK = 0xFF000000; /** * 将字符串按照指定大小生成二维码图片 */ public static Bitmap encodeToQR(String contentsToEncode,int dimension) throws Exception{ if(TextUtils.isEmpty(contentsToEncode)) return null; BarcodeFormat format = BarcodeFormat.QR_CODE; Map<EncodeHintType,Object> hints = new EnumMap<EncodeHintType,Object>(EncodeHintType.class); hints.put(EncodeHintType.CHARACTER_SET,"UTF-8"); BitMatrix result = new MultiFormatWriter().encode(contentsToEncode,format,dimension,hints); int width = result.getWidth(); int height = result.getHeight(); int[] pixels = new int[width * height]; 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,width,height); return bitmap; } public static Bitmap encodeToQRWidth(String contentsToEncode,int dimension) throws Exception{ if(TextUtils.isEmpty(contentsToEncode)) return null; BarcodeFormat format = BarcodeFormat.QR_CODE; Map<EncodeHintType,hints); int width = result.getWidth(); int height = result.getHeight(); boolean isFirstBlack = true; int startX = 0; int startY = 0; int[] pixels = new int[width * height]; 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; if(result.get(x,y) && isFirstBlack){ isFirstBlack = false; startX = x; startY = y; } } } Bitmap bitmap = Bitmap.createBitmap(width,height); Matrix m = new Matrix(); float sx = (width + 2f*startX) / width; float sy = (height + 2f*startY) / height; m.postScale(sx,sy); Bitmap qrBitmap = Bitmap.createBitmap(width,Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(qrBitmap); canvas.translate(-startX,-startY); Paint paint = new Paint(); paint.setAntiAlias(true); canvas.drawBitmap(bitmap,m,paint); canvas.save(); return qrBitmap; } } 以上内容由PHP站长网【52php.cn】收集整理供大家参考研究 如果以上内容对您有帮助,欢迎收藏、点赞、推荐、分享。 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |