zxing实现二维码扫描

已解决图片变形问题，实现快速扫描

直接上代码

第一步，先导入zxing类库和jar包

第二步，在layout中添加两个布局

capture_activity.xml  ：扫描界面的布局

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:background="@android:color/transparent"    android:orientation="vertical">    <SurfaceView        android:id="@+id/capture_surfaceview"        android:layout_width="match_parent"        android:layout_height="match_parent" />    <RelativeLayout        android:id="@+id/capture_container"        android:layout_width="match_parent"        android:layout_height="match_parent">        <ImageView            android:id="@+id/capture_mask_top"            android:layout_width="match_parent"            android:layout_height="120dp"            android:layout_alignParentTop="true"            android:background="@mipmap/shadow" />        <RelativeLayout            android:id="@+id/capture_crop_view"            android:layout_width="220dp"            android:layout_height="220dp"            android:layout_below="@id/capture_mask_top"            android:layout_centerHorizontal="true"            android:background="@mipmap/zcapture">            <ImageView                android:id="@+id/capture_scan_line"                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:layout_alignParentTop="true"                android:layout_marginBottom="5dp"                android:layout_marginTop="5dp"                android:src="@mipmap/scan_line" />        </RelativeLayout>        <ImageView            android:id="@+id/capture_mask_bottom"            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:layout_alignParentBottom="true"            android:layout_below="@id/capture_crop_view"            android:background="@mipmap/shadow" />        <ImageView            android:id="@+id/capture_mask_left"            android:layout_width="wrap_content"            android:layout_height="match_parent"            android:layout_above="@id/capture_mask_bottom"            android:layout_alignParentLeft="true"            android:layout_below="@id/capture_mask_top"            android:layout_toLeftOf="@id/capture_crop_view"            android:background="@mipmap/shadow" />        <ImageView            android:id="@+id/capture_mask_right"            android:layout_width="wrap_content"            android:layout_height="match_parent"            android:layout_above="@id/capture_mask_bottom"            android:layout_alignParentRight="true"            android:layout_below="@id/capture_mask_top"            android:layout_toRightOf="@id/capture_crop_view"            android:background="@mipmap/shadow" />    </RelativeLayout></RelativeLayout>

zxing_start_layout.xml ：启动扫描界面的布局

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical">    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/zxing_text"/>    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/button1"        android:text="扫码"/></LinearLayout>

第三步，在res目录下新建目录raw存放音频文件，用于扫描成功后的提示音

在mipmap目录下放几张图片，作为扫描线，阴影，边框

qrcode_scan_line.png

scan_line.9.png

shadow.png

zcapture.9.png

目录：

第四步，在values目录下添加ids.xml文件

ids.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <item name="decode" type="id"/>    <item name="decode_failed" type="id"/>    <item name="decode_succeeded" type="id"/>    <item name="quit" type="id"/>    <item name="restart_preview" type="id"/>    <item name="return_scan_result" type="id"/></resources>

第五步，新建一个StartCaptureActivity，用于启动扫描界面

package com.ard.captureapp.zxing.activity;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.TextView;import com.ard.captureapp.R;public class StartCaptureActivity extends Activity {    TextView tv=null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.zxing_start_layout);        tv= (TextView) findViewById(R.id.zxing_text);        findViewById(R.id.button1).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent(StartCaptureActivity.this, CaptureActivity.class);                startActivityForResult(intent, 0x1);            }        });    }//重写该方法获取扫描完成后得到的结果    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        super.onActivityResult(requestCode, resultCode, data);        if(resultCode==RESULT_OK&&data!=null){            Bundle bundle=data.getExtras();            tv.setText(bundle.getString("result"));        }    }}

修改CaptureActivity，重写其中的handleDecode(Result rawResult, Bundle bundle)方法，使之将扫描的结果返回给StartCaptureActivity

/* * 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.ard.captureapp.zxing.activity;import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.content.Intent;import android.graphics.Rect;import android.os.Bundle;import android.os.Handler;import android.util.Log;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.Window;import android.view.WindowManager;import android.view.animation.Animation;import android.view.animation.TranslateAnimation;import android.widget.ImageView;import android.widget.RelativeLayout;import com.ard.captureapp.R;import com.ard.captureapp.zxing.camera.CameraManager;import com.ard.captureapp.zxing.decode.DecodeThread;import com.ard.captureapp.zxing.utils.BeepManager;import com.ard.captureapp.zxing.utils.CaptureActivityHandler;import com.ard.captureapp.zxing.utils.InactivityTimer;import com.google.zxing.Result;import java.io.IOException;import java.lang.reflect.Field;/** * This activity opens the camera and does the actual scanning on a background * thread. It draws a viewfinder to help the user place the barcode correctly, * shows feedback as the image processing is happening, and then overlays the * results when a scan is successful. * */public final class CaptureActivity extends Activity implements SurfaceHolder.Callback {    private static final String TAG = CaptureActivity.class.getSimpleName();    private CameraManager cameraManager;    private CaptureActivityHandler handler;    private InactivityTimer inactivityTimer;    private BeepManager beepManager;    private SurfaceView scanPreview = null;    private RelativeLayout scanContainer;    private RelativeLayout scanCropView;    private ImageView scanLine;    private Rect mCropRect = null;    private boolean isHasSurface = false;    public Handler getHandler() {        return handler;    }    public CameraManager getCameraManager() {        return cameraManager;    }    @Override    public void onCreate(Bundle icicle) {        super.onCreate(icicle);        Window window = getWindow();        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);        setContentView(R.layout.capture_activity);        initView();    }    private void initView() {        scanPreview = (SurfaceView) findViewById(R.id.capture_surfaceview);        scanContainer = (RelativeLayout) findViewById(R.id.capture_container);        scanCropView = (RelativeLayout) findViewById(R.id.capture_crop_view);        scanLine = (ImageView) findViewById(R.id.capture_scan_line);        inactivityTimer = new InactivityTimer(this);        beepManager = new BeepManager(this);        TranslateAnimation animation = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, 0.0f, Animation                .RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT,                0.9f);        animation.setDuration(4500);        animation.setRepeatCount(-1);        animation.setRepeatMode(Animation.RESTART);        scanLine.startAnimation(animation);    }    @Override    protected void onResume() {        super.onResume();        // CameraManager must be initialized here, not in onCreate(). This is        // necessary because we don't        // want to open the camera driver and measure the screen size if we're        // going to show the help on        // first launch. That led to bugs where the scanning rectangle was the        // wrong size and partially        // off screen.        cameraManager = new CameraManager(getApplication());        handler = null;        if (isHasSurface) {            // The activity was paused but not stopped, so the surface still            // exists. Therefore            // surfaceCreated() won't be called, so init the camera here.            initCamera(scanPreview.getHolder());        } else {            // Install the callback and wait for surfaceCreated() to init the            // camera.            scanPreview.getHolder().addCallback(this);        }        inactivityTimer.onResume();    }    @Override    protected void onPause() {        if (handler != null) {            handler.quitSynchronously();            handler = null;        }        inactivityTimer.onPause();        beepManager.close();        cameraManager.closeDriver();        if (!isHasSurface) {            scanPreview.getHolder().removeCallback(this);        }        super.onPause();    }    @Override    protected void onDestroy() {        inactivityTimer.shutdown();        super.onDestroy();    }    @Override    public void surfaceCreated(SurfaceHolder holder) {        if (holder == null) {            Log.e(TAG, "*** WARNING *** surfaceCreated() gave us a null surface!");        }        if (!isHasSurface) {            isHasSurface = true;            initCamera(holder);        }    }    @Override    public void surfaceDestroyed(SurfaceHolder holder) {        isHasSurface = false;    }    @Override    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {    }    /**     * A valid barcode has been found, so give an indication of success and show     * the results.     *     * @param rawResult The contents of the barcode.     * @param bundle    The extras     */    public void handleDecode(Result rawResult, Bundle bundle) {        inactivityTimer.onActivity();        beepManager.playBeepSoundAndVibrate();/** * 返回解析数据 * 注：用真机测试 */        Intent resultIntent = new Intent();        bundle.putString("result", rawResult.getText());        resultIntent.putExtras(bundle);        this.setResult(RESULT_OK, resultIntent);        CaptureActivity.this.finish();    }    private void initCamera(SurfaceHolder surfaceHolder) {        if (surfaceHolder == null) {            throw new IllegalStateException("No SurfaceHolder provided");        }        if (cameraManager.isOpen()) {            Log.w(TAG, "initCamera() while already open -- late SurfaceView callback?");            return;        }        try {            cameraManager.openDriver(surfaceHolder);            // Creating the handler starts the preview, which can also throw a            // RuntimeException.            if (handler == null) {                handler = new CaptureActivityHandler(this, cameraManager, DecodeThread.ALL_MODE);            }            initCrop();        } catch (IOException ioe) {            Log.w(TAG, ioe);            displayFrameworkBugMessageAndExit();        } catch (RuntimeException e) {            // Barcode Scanner has seen crashes in the wild of this variety:            // java.?lang.?RuntimeException: Fail to connect to camera service            Log.w(TAG, "Unexpected error initializing camera", e);            displayFrameworkBugMessageAndExit();        }    }    private void displayFrameworkBugMessageAndExit() {        // camera error        AlertDialog.Builder builder = new AlertDialog.Builder(this);        builder.setTitle(getString(R.string.app_name));        builder.setMessage("Camera error");        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {            @Override            public void onClick(DialogInterface dialog, int which) {                finish();            }        });        builder.setOnCancelListener(new DialogInterface.OnCancelListener() {            @Override            public void onCancel(DialogInterface dialog) {                finish();            }        });        builder.show();    }    public void restartPreviewAfterDelay(long delayMS) {        if (handler != null) {            handler.sendEmptyMessageDelayed(R.id.restart_preview, delayMS);        }    }    public Rect getCropRect() {        return mCropRect;    }    /**     * 初始化截取的矩形区域     */    private void initCrop() {        int cameraWidth = cameraManager.getCameraResolution().y;        int cameraHeight = cameraManager.getCameraResolution().x;        /** 获取布局中扫描框的位置信息 */        int[] location = new int[2];        scanCropView.getLocationInWindow(location);        int cropLeft = location[0];        int cropTop = location[1] - getStatusBarHeight();        int cropWidth = scanCropView.getWidth();        int cropHeight = scanCropView.getHeight();        /** 获取布局容器的宽高 */        int containerWidth = scanContainer.getWidth();        int containerHeight = scanContainer.getHeight();        /** 计算最终截取的矩形的左上角顶点x坐标 */        int x = cropLeft * cameraWidth / containerWidth;        /** 计算最终截取的矩形的左上角顶点y坐标 */        int y = cropTop * cameraHeight / containerHeight;        /** 计算最终截取的矩形的宽度 */        int width = cropWidth * cameraWidth / containerWidth;        /** 计算最终截取的矩形的高度 */        int height = cropHeight * cameraHeight / containerHeight;        /** 生成最终的截取的矩形 */        mCropRect = new Rect(x, y, width + x, height + y);    }    private int getStatusBarHeight() {        try {            Class<?> c = Class.forName("com.android.internal.R$dimen");            Object obj = c.newInstance();            Field field = c.getField("status_bar_height");            int x = Integer.parseInt(field.get(obj).toString());            return getResources().getDimensionPixelSize(x);        } catch (Exception e) {            e.printStackTrace();        }        return 0;    }}

注意：要在清单文件中配置这两个Activity，并添加相关权限

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.ard.captureapp" >    <!-- 摄像头权限 -->   <!-- 二维码扫码 -->    <uses-permission android:name="android.permission.CAMERA" />    <uses-permission android:name="android.permission.FLASHLIGHT" />    <uses-permission android:name="android.permission.VIBRATE" />    <uses-feature android:name="android.hardware.camera" />    <uses-feature android:name="android.hardware.camera.autofocus" />    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/AppTheme" >        <activity android:name=".zxing.activity.StartCaptureActivity" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity android:name=".zxing.activity.CaptureActivity"/>    </application></manifest>