android 二維碼簡化,實現仿qq掃描效果
了解二維碼這個東西還是從微信中,當時微信推出二維碼掃描功能,自己感覺挺新穎的,從一張圖片中掃一下竟然能直接加好友,不可思議啊,那時候還不了解二維碼,嗬嗬,然後做項目的時候,老板說要加上二維碼掃描功能,然後自己的屁顛屁顛的去百度,google啥的,發現很多朋友都有介紹二維碼掃描的功能,然後我就跟著人家的介紹自己搞起了二維碼掃描功能,跟著人家的帖子,很快我的項目就加入了掃描二維碼的功能,然後自己還很開心。
隨著微信的到來,二維碼越來越火爆,隨處能看到二維碼,比如商城裏麵,肯德基,餐廳等等,對於二維碼掃描我們使用的是google的開源框架Zxing,我們可以去https://code.google.com/p/zxing/下載源碼和Jar包,之前我項目中的二維碼掃描功能隻實現了掃描功能,其UI真的是其醜無比,一個好的應用軟件,其UI界麵也要被大眾所接納,不然人家就不會用你的軟件啦,所以說應用軟件功能和界麵一樣都很重要,例如微信,相信微信UI被很多應用軟件所模仿,我也仿照微信掃描二維碼效果進行模仿,雖然沒有微信做的那麼精致,但是效果還是可以的,所以將自己修改UI的代碼和掃描二維碼的代碼分享給大家,一是自己以後項目遇到同樣的功能直接拷貝來用,二是給還沒有加入二維碼功能的人一個參考,站在巨人的肩膀上,哈哈,我之前也是站在巨人的肩膀上加上此功能,接下來跟著我一步一步來實現此項功能,裏麵去除了很多不必要的文件
我們先看下項目的結構
- 如果你項目也想加入此功能,你直接將com.mining.app.zxing.camera,com.mining.app.zxing.decoding,com.mining.app.zxing.view這三個包拷貝到你的項目中,然後引入相對應的資源進去,我也是從我的項目中直接引用過來的,包名都沒改呢,當然還需要引用Zxing.jar
- com.example.qr_codescan包裏麵有一個MipcaActivityCapture,也是直接引入我之前項目的代碼的,這個Activity主要處理掃描界麵的類,比如,掃描成功有聲音和振動等等,主要關注裏麵的handleDecode(Result result, Bitmap barcode)方法,掃描完成之後將掃描到的結果和二維碼的bitmap當初參數傳遞到handleDecode(Result result, Bitmap barcode)裏麵,我們隻需要在裏麵寫出相對應的處理代碼即可,其他的地方都不用改得,我這裏處理掃描結果和掃描拍的照片
- /**
- * 處理掃描結果
- * @param result
- * @param barcode
- */
- public void handleDecode(Result result, Bitmap barcode) {
- inactivityTimer.onActivity();
- playBeepSoundAndVibrate();
- String resultString = result.getText();
- if (resultString.equals("")) {
- Toast.makeText(MipcaActivityCapture.this, "Scan failed!", Toast.LENGTH_SHORT).show();
- }else {
- Intent resultIntent = new Intent();
- Bundle bundle = new Bundle();
- bundle.putString("result", resultString);
- bundle.putParcelable("bitmap", barcode);
- resultIntent.putExtras(bundle);
- this.setResult(RESULT_OK, resultIntent);
- }
- MipcaActivityCapture.this.finish();
- }
- 我對MipcaActivityCapture界麵的布局做了自己的改動,先看下效果圖,主要是用到FrameLayout,裏麵嵌套RelativeLayout,裏麵的圖片也是從微信裏麵拿出來的,平常我看到需要什麼圖片就去微信裏麵找,沒有美工的公司的程序員就是苦逼
布局代碼如下
- <?xml version="1.0" encoding="utf-8"?>
- <FrameLayout xmlns:android="https://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent" >
- <RelativeLayout
- android:layout_width="fill_parent"
- android:layout_height="fill_parent" >
- <SurfaceView
- android:id="@+id/preview_view"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:layout_gravity="center" />
- <com.mining.app.zxing.view.ViewfinderView
- android:id="@+id/viewfinder_view"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content" />
- <include
- android:id="@+id/include1"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:layout_alignParentTop="true"
- layout="@layout/activity_title" />
- </RelativeLayout>
- </FrameLayout>
- <?xml version="1.0" encoding="utf-8"?>
- <RelativeLayout xmlns:android="https://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:background="@drawable/mmtitle_bg_alpha" >
- <Button
- android:id="@+id/button_back"
- android:layout_width="75.0dip"
- android:text="返回"
- android:background="@drawable/mm_title_back_btn"
- android:textColor="@android:color/white"
- android:layout_height="wrap_content"
- android:layout_centerVertical="true"
- android:layout_marginLeft="2dip" />
- <TextView
- android:id="@+id/textview_title"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:layout_alignBaseline="@+id/button_back"
- android:layout_alignBottom="@+id/button_back"
- android:layout_centerHorizontal="true"
- android:gravity="center_vertical"
- android:text="二維碼掃描"
- android:textColor="@android:color/white"
- android:textSize="18sp" />
- </RelativeLayout>
- 在我這個demo裏麵,有一個主界麵MainActivity,裏麵一個Button, 一個ImageView和一個TextView,點擊Button進入到二維碼掃描界麵,當掃描OK的時候,回到主界麵,將掃描的結果顯示到TextView,將圖片顯示到ImageView裏麵,然後你可以不處理圖片,我這裏隨帶的加上圖片,主界麵的布局很簡單如下
- <RelativeLayout xmlns:android="https://schemas.android.com/apk/res/android"
- xmlns:tools="https://schemas.android.com/tools"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:background="#ffe1e0de" >
- <Button
- android:id="@+id/button1"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:layout_alignParentTop="true"
- android:text="掃描二維碼" />
- <TextView
- android:id="@+id/result"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:layout_below="@+id/button1"
- android:lines="2"
- android:gravity="center_horizontal"
- android:textColor="@android:color/black"
- android:textSize="16sp" />
- <ImageView
- android:id="@+id/qrcode_bitmap"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:layout_alignParentLeft="true"
- android:layout_below="@+id/result"/>
- </RelativeLayout>
- MainActivity裏麵的代碼如下,裏麵的功能在上麵已經說了
- package com.example.qr_codescan;
- import android.app.Activity;
- import android.content.Intent;
- import android.graphics.Bitmap;
- import android.os.Bundle;
- import android.view.View;
- import android.view.View.OnClickListener;
- import android.widget.Button;
- import android.widget.ImageView;
- import android.widget.TextView;
- public class MainActivity extends Activity {
- private final static int SCANNIN_GREQUEST_CODE = 1;
- /**
- * 顯示掃描結果
- */
- private TextView mTextView ;
- /**
- * 顯示掃描拍的圖片
- */
- private ImageView mImageView;
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- mTextView = (TextView) findViewById(R.id.result);
- mImageView = (ImageView) findViewById(R.id.qrcode_bitmap);
- //點擊按鈕跳轉到二維碼掃描界麵,這裏用的是startActivityForResult跳轉
- //掃描完了之後調到該界麵
- Button mButton = (Button) findViewById(R.id.button1);
- mButton.setOnClickListener(new OnClickListener() {
- @Override
- public void onClick(View v) {
- Intent intent = new Intent();
- intent.setClass(MainActivity.this, MipcaActivityCapture.class);
- intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
- startActivityForResult(intent, SCANNIN_GREQUEST_CODE);
- }
- });
- }
- @Override
- protected void onActivityResult(int requestCode, int resultCode, Intent data) {
- super.onActivityResult(requestCode, resultCode, data);
- switch (requestCode) {
- case SCANNIN_GREQUEST_CODE:
- if(resultCode == RESULT_OK){
- Bundle bundle = data.getExtras();
- //顯示掃描到的內容
- mTextView.setText(bundle.getString("result"));
- //顯示
- mImageView.setImageBitmap((Bitmap) data.getParcelableExtra("bitmap"));
- }
- break;
- }
- }
- }
- 上麵的代碼還是比較簡單,但是要想做出像微信那樣隻的掃描框,緊緊上麵的代碼是沒有那種效果的,我們必須重寫com.mining.app.zxing.view包下麵的ViewfinderView類,微信裏麵的都是用的圖片,我是自己畫出來的,代碼注釋的比較清楚,大家直接看代碼吧,相信你能理解的,如果你要修改掃描框的大小,去CameraManager類裏麵修改
- /*
- * Copyright (C) 2008 ZXing authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- package com.mining.app.zxing.view;
- import java.util.Collection;
- import java.util.HashSet;
- import android.content.Context;
- import android.content.res.Resources;
- import android.graphics.Bitmap;
- import android.graphics.Canvas;
- import android.graphics.Color;
- import android.graphics.Paint;
- import android.graphics.Rect;
- import android.graphics.Typeface;
- import android.util.AttributeSet;
- import android.view.View;
- import com.example.qr_codescan.R;
- import com.google.zxing.ResultPoint;
- import com.mining.app.zxing.camera.CameraManager;
- /**
- * This view is overlaid on top of the camera preview. It adds the viewfinder
- * rectangle and partial transparency outside it, as well as the laser scanner
- * animation and result points.
- *
- */
- public final class ViewfinderView extends View {
- private static final String TAG = "log";
- /**
- * 刷新界麵的時間
- */
- private static final long ANIMATION_DELAY = 10L;
- private static final int OPAQUE = 0xFF;
- /**
- * 四個綠色邊角對應的長度
- */
- private int ScreenRate;
- /**
- * 四個綠色邊角對應的寬度
- */
- private static final int CORNER_WIDTH = 10;
- /**
- * 掃描框中的中間線的寬度
- */
- private static final int MIDDLE_LINE_WIDTH = 6;
- /**
- * 掃描框中的中間線的與掃描框左右的間隙
- */
- private static final int MIDDLE_LINE_PADDING = 5;
- /**
- * 中間那條線每次刷新移動的距離
- */
- private static final int SPEEN_DISTANCE = 5;
- /**
- * 手機的屏幕密度
- */
- private static float density;
- /**
- * 字體大小
- */
- private static final int TEXT_SIZE = 16;
- /**
- * 字體距離掃描框下麵的距離
- */
- private static final int TEXT_PADDING_TOP = 30;
- /**
- * 畫筆對象的引用
- */
- private Paint paint;
- /**
- * 中間滑動線的最頂端位置
- */
- private int slideTop;
- /**
- * 中間滑動線的最底端位置
- */
- private int slideBottom;
- private Bitmap resultBitmap;
- private final int maskColor;
- private final int resultColor;
- private final int resultPointColor;
- private Collection<ResultPoint> possibleResultPoints;
- private Collection<ResultPoint> lastPossibleResultPoints;
- boolean isFirst;
- public ViewfinderView(Context context, AttributeSet attrs) {
- super(context, attrs);
- density = context.getResources().getDisplayMetrics().density;
- //將像素轉換成dp
- ScreenRate = (int)(20 * density);
- paint = new Paint();
- Resources resources = getResources();
- maskColor = resources.getColor(R.color.viewfinder_mask);
- resultColor = resources.getColor(R.color.result_view);
- resultPointColor = resources.getColor(R.color.possible_result_points);
- possibleResultPoints = new HashSet<ResultPoint>(5);
- }
- @Override
- public void onDraw(Canvas canvas) {
- //中間的掃描框,你要修改掃描框的大小,去CameraManager裏麵修改
- Rect frame = CameraManager.get().getFramingRect();
- if (frame == null) {
- return;
- }
- //初始化中間線滑動的最上邊和最下邊
- if(!isFirst){
- isFirst = true;
- slideTop = frame.top;
- slideBottom = frame.bottom;
- }
- //獲取屏幕的寬和高
- int width = canvas.getWidth();
- int height = canvas.getHeight();
- paint.setColor(resultBitmap != null ? resultColor : maskColor);
- //畫出掃描框外麵的陰影部分,共四個部分,掃描框的上麵到屏幕上麵,掃描框的下麵到屏幕下麵
- //掃描框的左邊麵到屏幕左邊,掃描框的右邊到屏幕右邊
- canvas.drawRect(0, 0, width, frame.top, paint);
- canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
- canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1,
- paint);
- canvas.drawRect(0, frame.bottom + 1, width, height, paint);
- if (resultBitmap != null) {
- // Draw the opaque result bitmap over the scanning rectangle
- paint.setAlpha(OPAQUE);
- canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);
- } else {
- //畫掃描框邊上的角,總共8個部分
- paint.setColor(Color.GREEN);
- canvas.drawRect(frame.left, frame.top, frame.left + ScreenRate,
- frame.top + CORNER_WIDTH, paint);
- canvas.drawRect(frame.left, frame.top, frame.left + CORNER_WIDTH, frame.top
- + ScreenRate, paint);
- canvas.drawRect(frame.right - ScreenRate, frame.top, frame.right,
- frame.top + CORNER_WIDTH, paint);
- canvas.drawRect(frame.right - CORNER_WIDTH, frame.top, frame.right, frame.top
- + ScreenRate, paint);
- canvas.drawRect(frame.left, frame.bottom - CORNER_WIDTH, frame.left
- + ScreenRate, frame.bottom, paint);
- canvas.drawRect(frame.left, frame.bottom - ScreenRate,
- frame.left + CORNER_WIDTH, frame.bottom, paint);
- canvas.drawRect(frame.right - ScreenRate, frame.bottom - CORNER_WIDTH,
- frame.right, frame.bottom, paint);
- canvas.drawRect(frame.right - CORNER_WIDTH, frame.bottom - ScreenRate,
- frame.right, frame.bottom, paint);
- //繪製中間的線,每次刷新界麵,中間的線往下移動SPEEN_DISTANCE
- slideTop += SPEEN_DISTANCE;
- if(slideTop >= frame.bottom){
- slideTop = frame.top;
- }
- canvas.drawRect(frame.left + MIDDLE_LINE_PADDING, slideTop - MIDDLE_LINE_WIDTH/2, frame.right - MIDDLE_LINE_PADDING,slideTop + MIDDLE_LINE_WIDTH/2, paint);
- //畫掃描框下麵的字
- paint.setColor(Color.WHITE);
- paint.setTextSize(TEXT_SIZE * density);
- paint.setAlpha(0x40);
- paint.setTypeface(Typeface.create("System", Typeface.BOLD));
- canvas.drawText(getResources().getString(R.string.scan_text), frame.left, (float) (frame.bottom + (float)TEXT_PADDING_TOP *density), paint);
- Collection<ResultPoint> currentPossible = possibleResultPoints;
- Collection<ResultPoint> currentLast = lastPossibleResultPoints;
- if (currentPossible.isEmpty()) {
- lastPossibleResultPoints = null;
- } else {
- possibleResultPoints = new HashSet<ResultPoint>(5);
- lastPossibleResultPoints = currentPossible;
- paint.setAlpha(OPAQUE);
- paint.setColor(resultPointColor);
- for (ResultPoint point : currentPossible) {
- canvas.drawCircle(frame.left + point.getX(), frame.top
- + point.getY(), 6.0f, paint);
- }
- }
- if (currentLast != null) {
- paint.setAlpha(OPAQUE / 2);
- paint.setColor(resultPointColor);
- for (ResultPoint point : currentLast) {
- canvas.drawCircle(frame.left + point.getX(), frame.top
- + point.getY(), 3.0f, paint);
- }
- }
- //隻刷新掃描框的內容,其他地方不刷新
- postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top,
- frame.right, frame.bottom);
- }
- }
- public void drawViewfinder() {
- resultBitmap = null;
- invalidate();
- }
- /**
- * Draw a bitmap with the result points highlighted instead of the live
- * scanning display.
- *
- * @param barcode
- * An image of the decoded barcode.
- */
- public void drawResultBitmap(Bitmap barcode) {
- resultBitmap = barcode;
- invalidate();
- }
- public void addPossibleResultPoint(ResultPoint point) {
- possibleResultPoints.add(point);
- }
- }
上麵的代碼中,中間那根線微信是用的圖片,我這裏是畫的,如果你想更加仿真點就將下麵的代碼
- canvas.drawRect(frame.left + MIDDLE_LINE_PADDING, slideTop - MIDDLE_LINE_WIDTH/2, frame.right - MIDDLE_LINE_PADDING,slideTop + MIDDLE_LINE_WIDTH/2, paint);
改成
- Rect lineRect = new Rect();
- lineRect.left = frame.left;
- lineRect.right = frame.right;
- lineRect.top = slideTop;
- lineRect.bottom = slideTop + 18;
- canvas.drawBitmap(((BitmapDrawable)(getResources().getDrawable(R.drawable.qrcode_scan_line))).getBitmap(), null, lineRect, paint);
那條掃描線自己去微信裏麵找一下,我貼出來的失真了,下載微信apk,將後綴名改成zip,然後解壓就行了
畫掃描框下麵字體的代碼需要修改下,這樣子能根據字體自動排列在中間,如果字太長我沒有處理,那個要自動換行,你可以自行處理
- paint.setColor(Color.WHITE);
- paint.setTextSize(TEXT_SIZE * density);
- paint.setAlpha(0x40);
- paint.setTypeface(Typeface.DEFAULT_BOLD);
- String text = getResources().getString(R.string.R.string.scan_text);
- float textWidth = paint.measureText(text);
- canvas.drawText(text, (width - textWidth)/2, (float) (frame.bottom + (float)TEXT_PADDING_TOP *density), paint)
運行界麵截圖,其中中間的那根綠色的線會上下移動,跟微信的效果差不多,當然運行你還需要相對應的權限問題,有興趣的朋友可以去下載demo
從8點多寫這篇博客寫到現在,看起來這麼點字,但實際上還是比較耗時間的,如果你覺得這篇文章對你有幫助,你就頂一下,哈哈,洗澡睡覺去了,上麵的項目中還有一些資源文件我沒有貼出來,想要看效果可以下載源碼
我在Android 基於google Zxing實現對手機中的二維碼進行掃描這篇文章中實現了對手機中二維碼照片的掃描,並且替換了中間的掃描線,和微信效果更加相似,建議大家去下那文章的項目源碼
最後更新:2017-04-03 12:54:06