ZXing是一个开源的Java条码处理库，支持多种1D/2D条码解码和编码，如UPC、EAN、39码等。它可以在手机上利用摄像头进行条形码扫描解码。本文介绍了如何使用ZXing进行二维码的生成、自定义和扫描，适合需要实现二维码功能的开发者参考。
ZXing是一个开放源码的，用Java实现的多种格式的1D/2D条码图像处理库，它包含了联系到其他语言的端口。Zxing可以实现使用手机的内置的摄像头完成条形码的扫描及解码。该项目可实现的条形码编码和解码。目前支持以下格式：UPC-A，UPC-E、EAN-8，EAN-13、39码、93码。ZXing是个很经典的条码/二维码识别的开源类库，以前在功能机上，就有开发者使用J2ME运用ZXing了，不过要支持JSR-234规范(自动对焦)的手机才能发挥其威力。
生成二维码的时候需要导入ZXing包，
compile 'cn.yipianfengye.android:zxing-library:2.1'
二维码我做了以下几个部分，生成二维码，和自定义二维码,扫描二维码。
照着我的向下做，保你完成：
先是布局：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <Button android:id="@+id/but1" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="生成二维码" /> <Button android:id="@+id/but2" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="生成自己的二维码" /> <Button android:id="@+id/but3" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="扫描二维码" /> <Button android:id="@+id/but4" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="调用相册的二维码" /> <ImageView android:id="@+id/image" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout>下来就是初始化：
并且在清单文件里注册：
public class MyApp extends Application { @Override public void onCreate() { super.onCreate(); ZXingLibrary.initDisplayOpinion(this); } }接下来是权限：
<uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <!-- 这个权限用于进行网络定位 --> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> <!-- 这个权限用于访问GPS定位 --> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <!-- 用于访问wifi网络信息，wifi信息会用于进行网络定位 --> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> <!-- 获取运营商信息，用于支持提供运营商信息相关的接口 --> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <!-- 这个权限用于获取wifi的获取权限，wifi信息会用来进行网络定位 --> <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" /> <!-- 用于读取手机当前的状态 --> <uses-permission android:name="android.permission.READ_PHONE_STATE" /> <!-- 写入扩展存储，向扩展卡写入数据，用于写入离线定位数据 --> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <!-- SD卡读取权限，用户写入离线定位数据 --> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />然后是
<uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /> <!-- 这个权限用于进行网络定位 --> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> <!-- 这个权限用于访问GPS定位 --> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <!-- 用于访问wifi网络信息，wifi信息会用于进行网络定位 --> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> <!-- 获取运营商信息，用于支持提供运营商信息相关的接口 --> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <!-- 这个权限用于获取wifi的获取权限，wifi信息会用来进行网络定位 --> <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" /> <!-- 用于读取手机当前的状态 --> <uses-permission android:name="android.permission.READ_PHONE_STATE" /> <!-- 写入扩展存储，向扩展卡写入数据，用于写入离线定位数据 --> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <!-- SD卡读取权限，用户写入离线定位数据 --> <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />然后是mainactivity
package lianxi.bawei.com.twoweima; import android.content.ContentResolver; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.net.Uri; import android.provider.MediaStore; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.Toast; import com.google.zxing.BarcodeFormat; import com.google.zxing.EncodeHintType; import com.google.zxing.common.BitMatrix; import com.google.zxing.qrcode.QRCodeWriter; import com.uuzuche.lib_zxing.activity.CaptureActivity; import com.uuzuche.lib_zxing.activity.CodeUtils; import java.util.HashMap; import java.util.Map; public class MainActivity extends AppCompatActivity { private Button but1; private Button but2; private ImageView image; private Bitmap bitmap; private Button but3; private final int REQUEST_CODE = 1; public static final int REQUEST_IMAGE = 112; private Button but4; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initview(); //这是生成的二维码，下面有方法： but1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { bitmap = generateBitmap("你好", 400, 400); image.setImageBitmap(bitmap); } }); //设置二维码，把自己的头像设置上去： but2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { bitmap = generateBitmap("sanna", 400, 400); //添加logo //先得到一个logo图标 Bitmap logoBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher); //把logo添加到二维码上 Bitmap customBitmap = addLogo(bitmap, logoBitmap); image.setImageBitmap(customBitmap); } }); //这是扫描二维码： but3.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent_sao = new Intent(MainActivity.this, CaptureActivity.class); startActivityForResult(intent_sao, REQUEST_CODE); } }); //调用相册的二维码： but4.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(Intent.ACTION_GET_CONTENT); intent.addCategory(Intent.CATEGORY_OPENABLE); intent.setType("image/*"); startActivityForResult(intent, REQUEST_IMAGE); } }); } private void initview() { but1 = (Button) findViewById(R.id.but1); but2 = (Button) findViewById(R.id.but2); image = (ImageView) findViewById(R.id.image); but3 = (Button) findViewById(R.id.but3); but4 = (Button) findViewById(R.id.but4); } //生成二维码 private Bitmap generateBitmap(String content, int width, int height) { QRCodeWriter qrCodeWriter = new QRCodeWriter(); Map<EncodeHintType, String> hints = new HashMap<>(); hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); try { BitMatrix encode = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, width, height); int[] pixels = new int[width * height]; for (int i = 0; i < height; i++) { for (int j = 0; j < width; j++) { if (encode.get(j, i)) { pixels[i * width + j] = 0x00000000; } else { pixels[i * width + j] = 0xffffffff; } } } return Bitmap.createBitmap(pixels, 0, width, width, height, Bitmap.Config.RGB_565); } catch (Exception e) { e.printStackTrace(); } return null; } /** * 添加图标 * * @param qrBitmap * @param logoBitmap * @return */ private Bitmap addLogo(Bitmap qrBitmap, Bitmap logoBitmap) { int qrBitmapWidth = qrBitmap.getWidth(); int qrBitmapHeight = qrBitmap.getHeight(); int logoBitmapWidth = logoBitmap.getWidth(); int logoBitmapHeight = logoBitmap.getHeight(); Bitmap blankBitmap = Bitmap.createBitmap(qrBitmapWidth, qrBitmapHeight, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(blankBitmap); canvas.drawBitmap(qrBitmap, 0, 0, null); canvas.save(Canvas.ALL_SAVE_FLAG); float scaleSize = 1.0f; while ((logoBitmapWidth / scaleSize) > (qrBitmapWidth / 5) || (logoBitmapHeight / scaleSize) > (qrBitmapHeight / 5)) { scaleSize *= 2; } float sx = 1.0f / scaleSize; canvas.scale(sx, sx, qrBitmapWidth / 2, qrBitmapHeight / 2); canvas.drawBitmap(logoBitmap, (qrBitmapWidth - logoBitmapWidth) / 2, (qrBitmapHeight - logoBitmapHeight) / 2, null); canvas.restore(); return blankBitmap; } //重写方法，并判断： @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if (requestCode == REQUEST_CODE) { //处理扫描结果（在界面上显示） if (null != data) { Bundle bundle = data.getExtras(); if (bundle == null) { return; } if (bundle.getInt(CodeUtils.RESULT_TYPE) == CodeUtils.RESULT_SUCCESS) { String result = bundle.getString(CodeUtils.RESULT_STRING); Toast.makeText(this, "解析结果:" + result, Toast.LENGTH_LONG).show(); //web展示 Intent intent =new Intent(MainActivity.this,WebActivity.class); intent.putExtra("url",result); startActivity(intent); } else if (bundle.getInt(CodeUtils.RESULT_TYPE) == CodeUtils.RESULT_FAILED) { Toast.makeText(MainActivity.this, "解析二维码失败", Toast.LENGTH_LONG).show(); } } } if (requestCode == REQUEST_IMAGE) { if (data != null) { Uri uri = data.getData(); ContentResolver cr = getContentResolver(); try { Bitmap mBitmap = MediaStore.Images.Media.getBitmap(cr, uri);//显得到bitmap图片 CodeUtils.analyzeBitmap(ImageUtils.getImageAbsolutePath(MainActivity.this,uri), new CodeUtils.AnalyzeCallback() { @Override public void onAnalyzeSuccess(Bitmap mBitmap, String result) { Toast.makeText(MainActivity.this, "解析结果:" + result, Toast.LENGTH_LONG).show(); //web展示 Intent intent =new Intent(MainActivity.this,WebActivity.class); intent.putExtra("url",result); startActivity(intent); } @Override public void onAnalyzeFailed() { Toast.makeText(MainActivity.this, "解析二维码失败", Toast.LENGTH_LONG).show(); } }); if (mBitmap != null) { mBitmap.recycle(); } } catch (Exception e) { e.printStackTrace(); } } } } }//这是要跳转的布局：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_web" android:layout_width="match_parent" android:layout_height="match_parent" > <WebView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/web"> </WebView> </RelativeLayout>//跳转的页面：
public class WebActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_web); WebView web = (WebView) findViewById(R.id.web); Intent intent =getIntent(); String url = intent.getStringExtra("url"); web.loadUrl(url); } }//这是工具类：
public class ImageUtils { /** * 根据Uri获取图片绝对路径，解决Android4.4以上版本Uri转换 * * @param context * @param imageUri */ @TargetApi(19) public static String getImageAbsolutePath(Context context, Uri imageUri) { if (context == null || imageUri == null) return null; if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT && DocumentsContract.isDocumentUri(context, imageUri)) { if (isExternalStorageDocument(imageUri)) { String docId = DocumentsContract.getDocumentId(imageUri); String[] split = docId.split(":"); String type = split[0]; if ("primary".equalsIgnoreCase(type)) { return Environment.getExternalStorageDirectory() + "/" + split[1]; } } else if (isDownloadsDocument(imageUri)) { String id = DocumentsContract.getDocumentId(imageUri); Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id)); return getDataColumn(context, contentUri, null, null); } else if (isMediaDocument(imageUri)) { String docId = DocumentsContract.getDocumentId(imageUri); String[] split = docId.split(":"); String type = split[0]; Uri contentUri = null; if ("image".equals(type)) { contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI; } else if ("video".equals(type)) { contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI; } else if ("audio".equals(type)) { contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI; } String selection = MediaStore.Images.Media._ID + "=?"; String[] selectionArgs = new String[]{split[1]}; return getDataColumn(context, contentUri, selection, selectionArgs); } } // MediaStore (and general) else if ("content".equalsIgnoreCase(imageUri.getScheme())) { // Return the remote address if (isGooglePhotosUri(imageUri)) return imageUri.getLastPathSegment(); return getDataColumn(context, imageUri, null, null); } // File else if ("file".equalsIgnoreCase(imageUri.getScheme())) { return imageUri.getPath(); } return null; } public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) { Cursor cursor = null; String column = MediaStore.Images.Media.DATA; String[] projection = {column}; try { cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null); if (cursor != null && cursor.moveToFirst()) { int index = cursor.getColumnIndexOrThrow(column); return cursor.getString(index); } } finally { if (cursor != null) cursor.close(); } return null; } /** * @param uri The Uri to check. * @return Whether the Uri authority is ExternalStorageProvider. */ public static boolean isExternalStorageDocument(Uri uri) { return "com.android.externalstorage.documents".equals(uri.getAuthority()); } /** * @param uri The Uri to check. * @return Whether the Uri authority is DownloadsProvider. */ public static boolean isDownloadsDocument(Uri uri) { return "com.android.providers.downloads.documents".equals(uri.getAuthority()); } /** * @param uri The Uri to check. * @return Whether the Uri authority is MediaProvider. */ public static boolean isMediaDocument(Uri uri) { return "com.android.providers.media.documents".equals(uri.getAuthority()); } /** * @param uri The Uri to check. * @return Whether the Uri authority is Google Photos. */ public static boolean isGooglePhotosUri(Uri uri) { return "com.google.android.apps.photos.content".equals(uri.getAuthority()); } }这是我所知道的，希望大家能够采纳；
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