了解二维码这个东西还是从微信中,当时微信推出二维码扫描功能,自己感觉挺新颖的,从一张图片中扫一下竟然能直接加好友,不可思议啊,那时候还不了解二维码,呵呵,然后做项目的时候,老板说要加上二维码扫描功能,然后自己的屁颠屁颠的去百度,google啥的,发现很多朋友都有介绍二维码扫描的功能,然后我就跟着人家的介绍自己搞起了二维码扫描功能,跟着人家的帖子,很快我的项目就加入了扫描二维码的功能,然后自己还很开心。
随着微信的到来,二维码越来越火爆,随处能看到二维码,比如商城里面,肯德基,餐厅等等,对于二维码扫描我们使用的是google的开源框架Zxing,我们可以去http://code.google.com/p/zxing/下载源码和Jar包,之前我项目中的二维码扫描功能只实现了扫描功能,其UI真的是其丑无比,一个好的应用软件,其UI界面也要被大众所接纳,不然人家就不会用你的软件啦,所以说应用软件功能和界面一样都很重要,例如微信,相信微信UI被很多应用软件所模仿,我也仿照微信扫描二维码效果进行模仿,虽然没有微信做的那么精致,但是效果还是可以的,所以将自己修改UI的代码和扫描二维码的代码分享给大家,一是自己以后项目遇到同样的功能直接拷贝来用,二是给还没有加入二维码功能的人一个参考,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,接下来跟着我一步一步来实现此项功能,里面去除了很多不必要的文件
我们先看下项目的结构
- 如果你项目也想加入此功能,你直接将com.mining.app.zxing.camera,com.mining.app.zxing.decoding,com.mining.app.zxing.view这三个包拷贝到你的项目中,然后引入相对应的资源进去,我也是从我的项目中直接引用过来的,包名都没改呢,当然还需要引用Zxing.jar
- com.example.qr_codescan包里面有一个MipcaActivityCapture,也是直接引入我之前项目的代码的,这个Activity主要处理扫描界面的类,比如,扫描成功有声音和振动等等,主要关注里面的handleDecode(Result result, Bitmap barcode)方法,扫描完成之后将扫描到的结果和二维码的bitmap当初参数传递到handleDecode(Result result, Bitmap barcode)里面,我们只需要在里面写出相对应的处理代码即可,其他的地方都不用改得,我这里处理扫描结果和扫描拍的照片
- /**
- * 处理扫描结果
- * @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();
- }
- /**
- * 处理扫描结果
- * @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();
- }
- 我对MipcaActivityCapture界面的布局做了自己的改动,先看下效果图,主要是用到FrameLayout,里面嵌套RelativeLayout,里面的图片也是从微信里面拿出来的,平常我看到需要什么图片就去微信里面找,没有美工的公司的程序员就是苦逼
布局代码如下
- <?xml version="1.0" encoding="utf-8"?>
- <FrameLayout xmlns:android="http://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"?>
- <FrameLayout xmlns:android="http://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>
在里面我将界面上面部分写在另一个布局里面,然后include进来,因为这个activity_title在我项目里面还供其他的Activity使用,我也是直接拷贝出来的
- <?xml version="1.0" encoding="utf-8"?>
- <RelativeLayout xmlns:android="http://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="二维码扫描"
- android:textColor="@android:color/white"
- android:textSize="18sp" />
- </RelativeLayout>
- <?xml version="1.0" encoding="utf-8"?>
- <RelativeLayout xmlns:android="http://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="二维码扫描"
- android:textColor="@android:color/white"
- android:textSize="18sp" />
- </RelativeLayout>
- 在我这个demo里面,有一个主界面MainActivity,里面一个Button, 一个ImageView和一个TextView,点击Button进入到二维码扫描界面,当扫描OK的时候,回到主界面,将扫描的结果显示到TextView,将图片显示到ImageView里面,然后你可以不处理图片,我这里随带的加上图片,主界面的布局很简单如下
- <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
- xmlns:tools="http://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="扫描二维码" />
- <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>
- <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
- xmlns:tools="http://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="扫描二维码" />
- <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里面的代码如下,里面的功能在上面已经说了
- 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;
- /**
- * 显示扫描结果
- */
- private TextView mTextView ;
- /**
- * 显示扫描拍的图片
- */
- 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);
- //点击按钮跳转到二维码扫描界面,这里用的是startActivityForResult跳转
- //扫描完了之后调到该界面
- 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();
- //显示扫描到的内容
- mTextView.setText(bundle.getString("result"));
- //显示
- mImageView.setImageBitmap((Bitmap) data.getParcelableExtra("bitmap"));
- }
- break;
- }
- }
- }
- 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;
- /**
- * 显示扫描结果
- */
- private TextView mTextView ;
- /**
- * 显示扫描拍的图片
- */
- 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);
- //点击按钮跳转到二维码扫描界面,这里用的是startActivityForResult跳转
- //扫描完了之后调到该界面
- 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();
- //显示扫描到的内容
- mTextView.setText(bundle.getString("result"));
- //显示
- mImageView.setImageBitmap((Bitmap) data.getParcelableExtra("bitmap"));
- }
- break;
- }
- }
- }
- 上面的代码还是比较简单,但是要想做出像微信那样只的扫描框,紧紧上面的代码是没有那种效果的,我们必须重写com.mining.app.zxing.view包下面的ViewfinderView类,微信里面的都是用的图片,我是自己画出来的,代码注释的比较清楚,大家直接看代码吧,相信你能理解的,如果你要修改扫描框的大小,去CameraManager类里面修改
- /*
- * 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
- *
- * http://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";
- /**
- * 刷新界面的时间
- */
- private static final long ANIMATION_DELAY = 10L;
- private static final int OPAQUE = 0xFF;
- /**
- * 四个绿色边角对应的长度
- */
- private int ScreenRate;
- /**
- * 四个绿色边角对应的宽度
- */
- private static final int CORNER_WIDTH = 10;
- /**
- * 扫描框中的中间线的宽度
- */
- private static final int MIDDLE_LINE_WIDTH = 6;
- /**
- * 扫描框中的中间线的与扫描框左右的间隙
- */
- private static final int MIDDLE_LINE_PADDING = 5;
- /**
- * 中间那条线每次刷新移动的距离
- */
- private static final int SPEEN_DISTANCE = 5;
- /**
- * 手机的屏幕密度
- */
- private static float density;
- /**
- * 字体大小
- */
- private static final int TEXT_SIZE = 16;
- /**
- * 字体距离扫描框下面的距离
- */
- private static final int TEXT_PADDING_TOP = 30;
- /**
- * 画笔对象的引用
- */
- private Paint paint;
- /**
- * 中间滑动线的最顶端位置
- */
- private int slideTop;
- /**
- * 中间滑动线的最底端位置
- */
- 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;
- //将像素转换成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) {
- //中间的扫描框,你要修改扫描框的大小,去CameraManager里面修改
- Rect frame = CameraManager.get().getFramingRect();
- if (frame == null) {
- return;
- }
- //初始化中间线滑动的最上边和最下边
- if(!isFirst){
- isFirst = true;
- slideTop = frame.top;
- slideBottom = frame.bottom;
- }
- //获取屏幕的宽和高
- int width = canvas.getWidth();
- int height = canvas.getHeight();
- paint.setColor(resultBitmap != null ? resultColor : maskColor);
- //画出扫描框外面的阴影部分,共四个部分,扫描框的上面到屏幕上面,扫描框的下面到屏幕下面
- //扫描框的左边面到屏幕左边,扫描框的右边到屏幕右边
- 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 {
- //画扫描框边上的角,总共8个部分
- 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);
- //绘制中间的线,每次刷新界面,中间的线往下移动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);
- //画扫描框下面的字
- 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);
- }
- }
- //只刷新扫描框的内容,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);
- }
- }
- /*
- * 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
- *
- * http://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";
- /**
- * 刷新界面的时间
- */
- private static final long ANIMATION_DELAY = 10L;
- private static final int OPAQUE = 0xFF;
- /**
- * 四个绿色边角对应的长度
- */
- private int ScreenRate;
- /**
- * 四个绿色边角对应的宽度
- */
- private static final int CORNER_WIDTH = 10;
- /**
- * 扫描框中的中间线的宽度
- */
- private static final int MIDDLE_LINE_WIDTH = 6;
- /**
- * 扫描框中的中间线的与扫描框左右的间隙
- */
- private static final int MIDDLE_LINE_PADDING = 5;
- /**
- * 中间那条线每次刷新移动的距离
- */
- private static final int SPEEN_DISTANCE = 5;
- /**
- * 手机的屏幕密度
- */
- private static float density;
- /**
- * 字体大小
- */
- private static final int TEXT_SIZE = 16;
- /**
- * 字体距离扫描框下面的距离
- */
- private static final int TEXT_PADDING_TOP = 30;
- /**
- * 画笔对象的引用
- */
- private Paint paint;
- /**
- * 中间滑动线的最顶端位置
- */
- private int slideTop;
- /**
- * 中间滑动线的最底端位置
- */
- 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;
- //将像素转换成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) {
- //中间的扫描框,你要修改扫描框的大小,去CameraManager里面修改
- Rect frame = CameraManager.get().getFramingRect();
- if (frame == null) {
- return;
- }
- //初始化中间线滑动的最上边和最下边
- if(!isFirst){
- isFirst = true;
- slideTop = frame.top;
- slideBottom = frame.bottom;
- }
- //获取屏幕的宽和高
- int width = canvas.getWidth();
- int height = canvas.getHeight();
- paint.setColor(resultBitmap != null ? resultColor : maskColor);
- //画出扫描框外面的阴影部分,共四个部分,扫描框的上面到屏幕上面,扫描框的下面到屏幕下面
- //扫描框的左边面到屏幕左边,扫描框的右边到屏幕右边
- 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 {
- //画扫描框边上的角,总共8个部分
- 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);
- //绘制中间的线,每次刷新界面,中间的线往下移动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);
- //画扫描框下面的字
- 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);
- }
- }
- //只刷新扫描框的内容,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);
- }
- }
上面的代码中,中间那根线微信是用的图片,我这里是画的,如果你想更加仿真点就将下面的代码
- canvas.drawRect(frame.left + MIDDLE_LINE_PADDING, slideTop - MIDDLE_LINE_WIDTH/2, frame.right - MIDDLE_LINE_PADDING,slideTop + MIDDLE_LINE_WIDTH/2, paint);
- 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);
- 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);
那条扫描线自己去微信里面找一下,我贴出来的失真了,下载微信apk,将后缀名改成zip,然后解压就行了
画扫描框下面字体的代码需要修改下,这样子能根据字体自动排列在中间,如果字太长我没有处理,那个要自动换行,你可以自行处理
- 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)
- 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)
运行界面截图,其中中间的那根绿色的线会上下移动,跟微信的效果差不多,当然运行你还需要相对应的权限问题,有兴趣的朋友可以去下载demo
从8点多写这篇博客写到现在,看起来这么点字,但实际上还是比较耗时间的,如果你觉得这篇文章对你有帮助,你就顶一下,哈哈,洗澡睡觉去了,上面的项目中还有一些资源文件我没有贴出来,想要看效果可以下载源码