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居然能直接加好友，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。发现非常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，非常快我的项目就增加了扫描二维码的功能，然后自己还非常开心。
随着微信的到来，二维码越来越火爆，随处能看到二维码，比方商城里面，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,我们能够去http://code.google.com/p/zxing/下载源代码和Jar包，之前我项目中的二维码扫描功能仅仅实现了扫描功能。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非常重要，比如微信，相信微信UI被非常多应用软件所模仿。我也仿照微信扫描二维码效果进行模仿，尽管没有微信做的那么精致。可是效果还是能够的。所以将自己改动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相同的功能直接拷贝来用。二是给还没有增加二维码功能的人一个參考，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，接下来跟着我一步一步来实现此项功能，里面去除了非常多不必要的文件
我们先看下项目的结构
- 假设你项目也想增加此功能。你直接将com.mining.app.zxing.camera。com.mining.app.zxing.decoding，com.mining.app.zxing.view这三个包复制到你的项目中，然后引入相相应的资源进去。我也是从我的项目中直接引用过来的。包名都没改呢。当然还须要引用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，比方。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，扫描完毕之后将扫描到的结果和二维码的bitmap当初參数传递到handleDecode(Result result, Bitmap barcode)里面，我们仅仅须要在里面写出相相应的处理代码就可以，其它的地方都不用改得。我这里处理扫描结果和扫描拍的照片
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public void handleDecode(Result result, Bitmap barcode) {
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inactivityTimer.onActivity();
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playBeepSoundAndVibrate();
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String resultString = result.getText();
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if (resultString.equals("")) {
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Toast.makeText(MipcaActivityCapture.this, "Scan failed!", Toast.LENGTH_SHORT).show();
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}else {
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Intent resultIntent = new Intent();
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Bundle bundle = new Bundle();
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bundle.putString("result", resultString);
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bundle.putParcelable("bitmap", barcode);
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resultIntent.putExtras(bundle);
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this.setResult(RESULT_OK, resultIntent);
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}
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MipcaActivityCapture.this.finish();
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}
- 我对MipcaActivityCapture界面的布局做了自己的修改，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，寻常我看到须要什么图片就去微信里面找，没有美工的公司的程序猿就是苦逼
布局代码例如以下
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<?xml version="1.0" encoding="utf-8"?
>
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<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="fill_parent"
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android:layout_height="fill_parent" >
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<RelativeLayout
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android:layout_width="fill_parent"
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android:layout_height="fill_parent" >
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<SurfaceView
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android:id="@+id/preview_view"
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android:layout_width="fill_parent"
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android:layout_height="fill_parent"
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android:layout_gravity="center" />
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<com.mining.app.zxing.view.ViewfinderView
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android:id="@+id/viewfinder_view"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content" />
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<include
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android:id="@+id/include1"
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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android:layout_alignParentTop="true"
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layout="@layout/activity_title" />
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</RelativeLayout>
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</FrameLayout>
在里面我将界面上面部分写在还有一个布局里面。然后include进来，由于这个activity_title在我项目里面还供其它的Activity使用。我也是直接拷贝出来的
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<?xml version="1.0" encoding="utf-8"?>
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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android:background="@drawable/mmtitle_bg_alpha" >
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<Button
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android:id="@+id/button_back"
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android:layout_width="75.0dip"
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android:text="返回"
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android:background="@drawable/mm_title_back_btn"
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android:textColor="@android:color/white"
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android:layout_height="wrap_content"
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android:layout_centerVertical="true"
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android:layout_marginLeft="2dip" />
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<TextView
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android:id="@+id/textview_title"
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android:layout_width="wrap_content"
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android:layout_height="wrap_content"
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android:layout_alignBaseline="@+id/button_back"
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android:layout_alignBottom="@+id/button_back"
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android:layout_centerHorizontal="true"
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android:gravity="center_vertical"
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android:text="二维码扫描"
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android:textColor="@android:color/white"
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android:textSize="18sp" />
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</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。然后你能够不处理图片。我这里随带的加上图片，主界面的布局非常easy例如以下
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:background="#ffe1e0de" >
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<Button
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android:id="@+id/button1"
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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android:layout_alignParentTop="true"
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android:text="扫描二维码" />
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<TextView
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android:id="@+id/result"
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android:layout_width="fill_parent"
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android:layout_height="wrap_content"
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android:layout_below="@+id/button1"
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android:lines="2"
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android:gravity="center_horizontal"
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android:textColor="@android:color/black"
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android:textSize="16sp" />
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<ImageView
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android:id="@+id/qrcode_bitmap"
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android:layout_width="fill_parent"
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android:layout_height="fill_parent"
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android:layout_alignParentLeft="true"
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android:layout_below="@+id/result"/>
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</RelativeLayout>
- MainActivity里面的代码例如以下。里面的功能在上面已经说了
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package com.example.qr_codescan;
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import android.app.Activity;
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import android.content.Intent;
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import android.graphics.Bitmap;
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import android.os.Bundle;
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import android.view.View;
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import android.view.View.OnClickListener;
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import android.widget.Button;
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import android.widget.ImageView;
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import android.widget.TextView;
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public class MainActivity extends Activity {
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private final static int SCANNIN_GREQUEST_CODE = 1;
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private TextView mTextView ;
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private ImageView mImageView;
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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mTextView = (TextView) findViewById(R.id.result);
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mImageView = (ImageView) findViewById(R.id.qrcode_bitmap);
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Button mButton = (Button) findViewById(R.id.button1);
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mButton.setOnClickListener(new OnClickListener() {
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@Override
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public void onClick(View v) {
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Intent intent = new Intent();
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intent.setClass(MainActivity.this, MipcaActivityCapture.class);
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intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
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startActivityForResult(intent, SCANNIN_GREQUEST_CODE);
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}
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});
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}
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@Override
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protected void onActivityResult(int requestCode, int resultCode, Intent data) {
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super.onActivityResult(requestCode, resultCode, data);
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switch (requestCode) {
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case SCANNIN_GREQUEST_CODE:
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if(resultCode == RESULT_OK){
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Bundle bundle = data.getExtras();
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mTextView.setText(bundle.getString("result"));
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mImageView.setImageBitmap((Bitmap) data.getParcelableExtra("bitmap"));
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}
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break;
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}
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}
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}
- 上面的代码还是比較简单，可是要想做出像微信那样仅仅的扫描框，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包以下的ViewfinderView类，微信里面的都是用的图片，我是自己画出来的。代码凝视的比較清楚，大家直接看代码吧。相信你能理解的，假设你要改动扫描框的大小。去CameraManager类里面改动
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package com.mining.app.zxing.view;
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import java.util.Collection;
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import java.util.HashSet;
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import android.content.Context;
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import android.content.res.Resources;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.Rect;
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import android.graphics.Typeface;
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import android.util.AttributeSet;
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import android.view.View;
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import com.example.qr_codescan.R;
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import com.google.zxing.ResultPoint;
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import com.mining.app.zxing.camera.CameraManager;
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public final class ViewfinderView extends View {
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private static final String TAG = "log";
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private static final long ANIMATION_DELAY = 10L;
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private static final int OPAQUE = 0xFF;
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private int ScreenRate;
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private static final int CORNER_WIDTH = 10;
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private static final int MIDDLE_LINE_WIDTH = 6;
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private static final int MIDDLE_LINE_PADDING = 5;
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private static final int SPEEN_DISTANCE = 5;
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private static float density;
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private static final int TEXT_SIZE = 16;
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private static final int TEXT_PADDING_TOP = 30;
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private Paint paint;
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private int slideTop;
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private int slideBottom;
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private Bitmap resultBitmap;
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private final int maskColor;
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private final int resultColor;
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private final int resultPointColor;
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private Collection<ResultPoint> possibleResultPoints;
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private Collection<ResultPoint> lastPossibleResultPoints;
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boolean isFirst;
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public ViewfinderView(Context context, AttributeSet attrs) {
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super(context, attrs);
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density = context.getResources().getDisplayMetrics().density;
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ScreenRate = (int)(20 * density);
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paint = new Paint();
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Resources resources = getResources();
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maskColor = resources.getColor(R.color.viewfinder_mask);
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resultColor = resources.getColor(R.color.result_view);
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resultPointColor = resources.getColor(R.color.possible_result_points);
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possibleResultPoints = new HashSet<ResultPoint>(5);
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}
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@Override
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public void onDraw(Canvas canvas) {
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Rect frame = CameraManager.get().getFramingRect();
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if (frame == null) {
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return;
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}
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if(!isFirst){
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isFirst = true;
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slideTop = frame.top;
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slideBottom = frame.bottom;
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}
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int width = canvas.getWidth();
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int height = canvas.getHeight();
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paint.setColor(resultBitmap != null ? resultColor : maskColor);
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canvas.drawRect(0, 0, width, frame.top, paint);
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canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
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canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1,
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paint);
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canvas.drawRect(0, frame.bottom + 1, width, height, paint);
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if (resultBitmap != null) {
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paint.setAlpha(OPAQUE);
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canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);
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} else {
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paint.setColor(Color.GREEN);
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canvas.drawRect(frame.left, frame.top, frame.left + ScreenRate,
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frame.top + CORNER_WIDTH, paint);
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canvas.drawRect(frame.left, frame.top, frame.left + CORNER_WIDTH, frame.top
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+ ScreenRate, paint);
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canvas.drawRect(frame.right - ScreenRate, frame.top, frame.right,
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frame.top + CORNER_WIDTH, paint);
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canvas.drawRect(frame.right - CORNER_WIDTH, frame.top, frame.right, frame.top
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+ ScreenRate, paint);
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canvas.drawRect(frame.left, frame.bottom - CORNER_WIDTH, frame.left
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+ ScreenRate, frame.bottom, paint);
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canvas.drawRect(frame.left, frame.bottom - ScreenRate,
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frame.left + CORNER_WIDTH, frame.bottom, paint);
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canvas.drawRect(frame.right - ScreenRate, frame.bottom - CORNER_WIDTH,
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frame.right, frame.bottom, paint);
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canvas.drawRect(frame.right - CORNER_WIDTH, frame.bottom - ScreenRate,
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frame.right, frame.bottom, paint);
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slideTop += SPEEN_DISTANCE;
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if(slideTop >= frame.bottom){
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slideTop = frame.top;
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}
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canvas.drawRect(frame.left + MIDDLE_LINE_PADDING, slideTop - MIDDLE_LINE_WIDTH/2, frame.right - MIDDLE_LINE_PADDING,slideTop + MIDDLE_LINE_WIDTH/2, paint);
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paint.setColor(Color.WHITE);
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paint.setTextSize(TEXT_SIZE * density);
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paint.setAlpha(0x40);
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paint.setTypeface(Typeface.create("System", Typeface.BOLD));
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canvas.drawText(getResources().getString(R.string.scan_text), frame.left, (float) (frame.bottom + (float)TEXT_PADDING_TOP *density), paint);
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Collection<ResultPoint> currentPossible = possibleResultPoints;
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Collection<ResultPoint> currentLast = lastPossibleResultPoints;
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if (currentPossible.isEmpty()) {
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lastPossibleResultPoints = null;
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} else {
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possibleResultPoints = new HashSet<ResultPoint>(5);
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lastPossibleResultPoints = currentPossible;
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paint.setAlpha(OPAQUE);
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paint.setColor(resultPointColor);
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for (ResultPoint point : currentPossible) {
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canvas.drawCircle(frame.left + point.getX(), frame.top
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+ point.getY(), 6.0f, paint);
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}
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}
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if (currentLast != null) {
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paint.setAlpha(OPAQUE / 2);
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paint.setColor(resultPointColor);
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for (ResultPoint point : currentLast) {
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canvas.drawCircle(frame.left + point.getX(), frame.top
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+ point.getY(), 3.0f, paint);
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}
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}
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postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top,
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frame.right, frame.bottom);
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}
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}
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public void drawViewfinder() {
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resultBitmap = null;
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invalidate();
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}
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public void drawResultBitmap(Bitmap barcode) {
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resultBitmap = barcode;
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invalidate();
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}
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public void addPossibleResultPoint(ResultPoint point) {
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possibleResultPoints.add(point);
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}
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}
上面的代码中。中间那根线微信是用的图片，我这里是画的，假设你想更加仿真点就将以下的代码
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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
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Rect lineRect = new Rect();
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lineRect.left = frame.left;
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lineRect.right = frame.right;
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lineRect.top = slideTop;
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lineRect.bottom = slideTop + 18;
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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,然后解压即可了
画扫描框以下字体的代码须要改动下。这样子能依据字体自己主动排列在中间，假设字太长我没有处理，那个要自己主动换行，你能够自行处理
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paint.setColor(Color.WHITE);
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paint.setTextSize(TEXT_SIZE * density);
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paint.setAlpha(0x40);
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paint.setTypeface(Typeface.DEFAULT_BOLD);
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String text = getResources().getString(R.string.R.string.scan_text);
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float textWidth = paint.measureText(text);
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canvas.drawText(text, (width - textWidth)/2, (float) (frame.bottom + (float)TEXT_PADDING_TOP *density), paint)
执行界面截图，当中中间的那根绿色的线会上下移动，跟微信的效果差点儿相同，当然执行你还须要相相应的权限问题，有兴趣的朋友能够去下载demo
从8点多写这篇博客写到如今，看起来这么点字。但实际上还是比較耗时间的。假设你认为这篇文章对你有帮助，你就顶一下，哈哈，洗澡睡觉去了，上面的项目中另一些资源文件我没有贴出来，想要看效果能够下载源代码
我在Android
基于google Zxing实现对手机中的二维码进行扫描这篇文章中实现了对手机中二维码照片的扫描。而且替换了中间的扫描线。和微信效果更加相似，建议大家去下那文章的项目源代码
