Android之不须要自己定义View（ViewfindView.java）最简单的二维码扫描
不废话，先爆照
第一步：
看下我项目里面的类结构
第二步：
给项目加入zxing.jar包
add as library
而且增加权限：
<uses-permission android:name="android.permission.CALL_PHONE"/>
<!-- 在SDCard中创建与删除文件权限 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<!-- 往SDCard写入数据权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<!--加入扫一扫二维码的权限-->
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.FLASHLIGHT" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />第三步：介绍相关类
camera类是关于相机的相关的配置
decode用来解码
utils是我们的帮助类
第四步：
这是CaptureActivity类
/*
* 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.dtr.zxing.activity;
import java.io.IOException;
import java.lang.reflect.Field;
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.dtr.zxing.camera.CameraManager;
import com.dtr.zxing.decode.DecodeThread;
import com.dtr.zxing.utils.BeepManager;
import com.dtr.zxing.utils.CaptureActivityHandler;
import com.dtr.zxing.utils.InactivityTimer;
import com.google.zxing.Result;
import com.kuyu.kuyucontact.R;
/**
* 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.
*
* @author dswitkin@google.com (Daniel Switkin)
* @author Sean Owen
*/
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;
public Handler getHandler() {
return handler;
}
public CameraManager getCameraManager() {
return cameraManager;
}
private boolean isHasSurface = false;
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
setContentView(R.layout.activity_capture);
scanPreview = (SurfaceView) findViewById(R.id.capture_preview);
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();
bundle.putInt("width", mCropRect.width());
bundle.putInt("height", mCropRect.height());
bundle.putString("result", rawResult.getText());
startActivity(new Intent(CaptureActivity.this, ResultActivity.class).putExtras(bundle));
}
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("相机打开出错，请稍后重试");
builder.setPositiveButton("确定", 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();
/** 计算终于截取的矩形的左上角顶点x坐标 */
int x = cropLeft * cameraWidth / containerWidth;
/** 计算终于截取的矩形的左上角顶点y坐标 */
int y = cropTop * cameraHeight / containerHeight;
/** 计算终于截取的矩形的宽度 */
int width = cropWidth * cameraWidth / containerWidth;
/** 计算终于截取的矩形的高度 */
int height = cropHeight * cameraHeight / containerHeight;
/** 生成终于的截取的矩形 */
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;
}
}ResulutActivity.java类
package com.dtr.zxing.activity;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.TypedValue;
import android.widget.ImageView;
import android.widget.LinearLayout.LayoutParams;
import android.widget.TextView;
import com.dtr.zxing.decode.DecodeThread;
import com.kuyu.kuyucontact.R;
public class ResultActivity extends Activity {
private ImageView mResultImage;
private TextView mResultText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_result);
Bundle extras = getIntent().getExtras();
mResultImage = (ImageView) findViewById(R.id.result_image);
mResultText = (TextView) findViewById(R.id.result_text);
if (null != extras) {
int width = extras.getInt("width");
int height = extras.getInt("height");
LayoutParams lps = new LayoutParams(width, height);
lps.topMargin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 30, getResources().getDisplayMetrics());
lps.leftMargin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, getResources().getDisplayMetrics());
lps.rightMargin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, getResources().getDisplayMetrics());
mResultImage.setLayoutParams(lps);
String result = extras.getString("result");
mResultText.setText(result);
Bitmap barcode = null;
byte[] compressedBitmap = extras.getByteArray(DecodeThread.BARCODE_BITMAP);
if (compressedBitmap != null) {
barcode = BitmapFactory.decodeByteArray(compressedBitmap, 0, compressedBitmap.length, null);
// Mutable copy:
barcode = barcode.copy(Bitmap.Config.RGB_565, true);
}
mResultImage.setImageBitmap(barcode);
}
}
}
好了，有些资源可能没有，Demo里面有相关的类和资源文件
