关于zxing二维码扫描的总结

众所周知，google的开源zxing二维码扫面，实现了我们基本的项目需求，然而里面还有很多问题需要解决，github上有许多大牛对zxing进行了封装，这边参考了“一片枫叶”的zxing项目。talk is cheap ,show me the code!

1.主activity实现下面几种功能

        //普通扫描
        mScanBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this, CaptureActivity.class);
                startActivityForResult(intent, REQUEST_CODE);
            }
        });
        //扫描图片解析
        mScanImgBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
                intent.addCategory(Intent.CATEGORY_OPENABLE);
                intent.setType("image/*");
                startActivityForResult(intent, REQUEST_IMG);
            }
        });
        //自定义UI
        mScanCustomUI.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this, CustomCaptureActivity.class);
                startActivityForResult(intent, REQUEST_CUSTOM);

            }
        });
        //生成图片二维码
        mMakeQRImg.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this, MakeQRCodeImgActivity.class);
                startActivity(intent);
            }
        });

2.onActivityResult处理返回内容

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();
                } 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_IMG) {
            if (null != data) {
                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(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();
                        }

                        @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();
                }
            }
        }
        if (requestCode == REQUEST_CUSTOM) {
            //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();
                } 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();
                }
            }
        }
    }

3.难点：自定义二维码界面

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_customcapture);
        cancelBtn= (Button) findViewById(R.id.ac_btn_cancel);

        CaptureFragment captureFragment = new CaptureFragment();
        // 为二维码扫描界面设置定制化界面R_layout.my_camera
        CodeUtils.setFragmentArgs(captureFragment, R.layout.my_camera);
        /**
         * 二维码解析回调函数
         */
        CodeUtils.AnalyzeCallback analyzeCallback = new CodeUtils.AnalyzeCallback() {
            @Override
            public void onAnalyzeSuccess(Bitmap mBitmap, String result) {
                Intent resultIntent = new Intent();
                Bundle bundle = new Bundle();
                bundle.putInt(CodeUtils.RESULT_TYPE, CodeUtils.RESULT_SUCCESS);
                bundle.putString(CodeUtils.RESULT_STRING, result);
                resultIntent.putExtras(bundle);
                setResult(RESULT_OK, resultIntent);
                finish();
            }

            @Override
            public void onAnalyzeFailed() {
                Intent resultIntent = new Intent();
                Bundle bundle = new Bundle();
                bundle.putInt(CodeUtils.RESULT_TYPE, CodeUtils.RESULT_FAILED);
                bundle.putString(CodeUtils.RESULT_STRING, "");
                resultIntent.putExtras(bundle);
                setResult(RESULT_OK, resultIntent);
                finish();
            }
        };
        captureFragment.setAnalyzeCallback(analyzeCallback);
        /**
         * 替换我们的扫描控件
         */
        getSupportFragmentManager().beginTransaction().replace(R.id.fl_my_container, captureFragment).commit();

• 问题一：通过uri得到string类型的根路径，该方法在一片枫叶的文档中是错误的，根本无法转换，通过搜索资料查询到需要自己重写一个工具类进行转换ImageUtils.getImageAbsolutePath(this, uri)。

• 问题二：在打开闪光灯的时候，一片枫叶的文档上Camera camera = CameraManager.get().getCamera();Android6.0根本无法获得相机,最后改方法为Camera camera= Camera.open();

最后：感谢一片枫叶的demo https://github.com/yipianfengye/android-zxingLibrary

该项目已同步到我的github：https://github.com/zziafyc/QRcodeDemo