編輯:Android開發實例
隨著微信的到來,二維碼越來越火爆,隨處能看到二維碼,比如商城裡面,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http://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只實現了掃描功能,其UI真的是其丑無比,一個好的應用軟件,其UI界面也要被大眾所接納,不然人家就不會用你的軟件啦,所以說應用軟件功能和界面一樣都很重要,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,裡面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包裡面有一個MipcaActivityCapture,也是直接引入我之前項目的代碼的,這個Activity主要處理掃描界面的類,比如,掃描成功有聲音和振動等等,主要關注裡面的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)裡面,我們只需要在裡面寫出相對應的處理代碼即可,其他的地方都不用改得,我這裡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界面的布局做了自己的改動,先看下效果圖,主要是用到FrameLayout,裡面嵌套RelativeLayout,裡面的圖片也是從微信裡面拿出來的,平常我看到需要什麼圖片就去微信裡面找,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="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>
在裡面我將界面上面部分寫在另一個布局裡面,然後include進來,因為這個activity_title在我項目裡面還供其他的Activity使用,我也是直接拷貝出來的
- <?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="二維碼掃描"
- android:textColor="@android:color/white"
- android:textSize="18sp" />
- </RelativeLayout>
在我這個demo裡面,有一個主界面MainActivity,裡面一個Button, 一個ImageView和一個TextView,點擊Button進入到二維碼掃描界面,當掃描OK的時候,回到主界面,將掃描的結果顯示到TextView,將圖片顯示到ImageView裡面,然後你可以不處理圖片,我這裡隨帶的加上圖片,主界面的布局很簡單如下
- <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="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裡面的代碼如下,裡面的功能在上面已經說了
- 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面,這裡用的是startActivityForResult跳轉
- //掃描完了之後調到該界面
- 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();
- //顯示掃描到的內容
- mTextView.setText(bundle.getString("result"));
- //顯示
- mImageView.setImageBitmap((Bitmap) data.getParcelableExtra("bitmap"));
- }
- break;
- }
- }
- }
上面的代碼還是比較簡單,但是要想做出像微信那樣只的掃描框,緊緊上面的代碼是沒有那種效果的,我們必須重寫com.mining.app.zxing.view包下面的ViewfinderView類,微信裡面的都是用的圖片,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類裡面修改
- /*
- * 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;
- /**
- * 字體距離掃描框下面的距離
- */
- 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裡面修改
- 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);
- //畫出掃描框外面的陰影部分,共四個部分,掃描框的上面到屏幕上面,掃描框的下面到屏幕下面
- //掃描框的左邊面到屏幕左邊,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);
- //繪制中間的線,每次刷新界面,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);
- }
- }
上面的代碼中,中間那根線微信是用的圖片,我這裡是畫的,如果你想更加仿真點就將下面的代碼
- 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裡面找一下,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
畫掃描框下面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)
運行界面截圖,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
源碼下載
轉自:http://blog .c sdn.net/ xiaan ming/article/details/10163203
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