Zxing二维码

需要在Manifest添加的权限:

<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" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />

导入依赖 

implementation 'cn.yipianfengye.android:zxing-library:2.2'

MainActivity中代码使用:

//初始化zxing依赖包
ZXingLibrary.initDisplayOpinion(this);

/**
 * 动态权限
 */
private void initPermission() {
    //检查权限
    String[] permissions = CheckPermissionutils.checkPermission(this);
    if(permissions.length == 0){
        //权限都申请了
    }else{
        //申请权限
        ActivityCompat.requestPermissions(this,permissions,100);
    }
}

/**
 * 按钮点击监听
 * @param v
 */
@Override
public void onClick(View v) {
    switch (v.getId()){
        case R.id.button:
            Intent intent = new Intent(this, CaptureActivity.class);
            startActivityForResult(intent,REQUEST_CODE);
            break;
        case R.id.button2:
            Intent intent1 = new Intent(Intent.ACTION_GET_CONTENT);
            intent1.addCategory(Intent.CATEGORY_OPENABLE);
            intent1.setType("image/*");
            startActivityForResult(intent1,REQUEST_IMAGE);
            break;
    }
}

处理返回的结果码:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    switch (requestCode){
        case REQUEST_CODE:
            //处理扫描结果
            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_SHORT).show();
                }else if(bundle.getInt(CodeUtils.RESULT_TYPE) == CodeUtils.RESULT_FAILED){
                    Toast.makeText(this, "解析二维码失败", Toast.LENGTH_SHORT).show();
                }
            }
            break;

        case REQUEST_IMAGE:
            if(data != null){
                Uri uri = data.getData();
                try{
                    CodeUtils.analyzeBitmap(ImageUtil.getImageAbsolutePath(this, uri), new CodeUtils.AnalyzeCallback() {
                        @Override
                        public void onAnalyzeSuccess(Bitmap mBitmap, String result) {
                            Toast.makeText(MainActivity.this, "解析结果:"+result, Toast.LENGTH_SHORT).show();
                            Log.i(TAG, "二维码图片识别:"+result);
                        }

                        @Override
                        public void onAnalyzeFailed() {
                            Toast.makeText(MainActivity.this, "解析失败!!!!!!", Toast.LENGTH_SHORT).show();
                        }
                    });
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
            break;
    }
}

写一个检查权限的类:

/**
 * 需要的权限手动写入数组中
 * 仅检测权限是否添加
 */
public class CheckPermissionutils {
    
    private CheckPermissionutils(){
        
    }
    
    //把需要申请的权限 放入一个数组
    private static String[] permissions = new String[]{
            Manifest.permission.WRITE_EXTERNAL_STORAGE,
            Manifest.permission.READ_EXTERNAL_STORAGE,
            Manifest.permission.CAMERA
            //Manifest.permission.SEND_SMS  // 例:短信权限
    };
    
    /* 检测权限 */
    public static String[] checkPermission(Context context){
        List<String> data = new ArrayList<>();//存储未申请的权限
        for (String permission : permissions) {
            int checkSelfPermission = ContextCompat.checkSelfPermission(context, permission);
            if(checkSelfPermission == PackageManager.PERMISSION_DENIED){//未申请
                data.add(permission);
            }
        }
        return data.toArray(new String[data.size()]);
    }
    
    
}

写一个ImageUtil类:

package com.example.utils;

import android.annotation.TargetApi;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;

public class ImageUtil {
    /**
     * 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());
    }
}