ScanCodeIdentify

前言：该项目主要介绍了二维码扫描、闪光灯开启、本地二维码图片识别、二维码生成。分别是zxing和zbar(网格二维码)分别实现，具体效果运行项目apk...

开发环境：AndroidStudio2.2.1+gradle-2.14.1

涉及知识：
1.Zxing和Zbar（网格）二维码扫描
2.闪光灯开启与关闭
3.本地二维码识别
4.二维码生成
5.Handler机制
6.butterknife注解式开发

引入依赖：

    compile 'com.android.support:appcompat-v7:22.+'
    compile 'com.google.zxing:core:3.2.1'
    compile 'com.jakewharton:butterknife:7.0.1'
    compile files('libs/zbar.jar')

部分代码：

/**
 * Zbar二维码扫描+闪光灯+本地二维码识别
 */
public class ZbarActivity extends AppCompatActivity implements QRCodeView.Delegate {
@Bind(R.id.zbarview)
ZBarView mQRCodeView;

@Bind(R.id.scancode_lamplight)
ToggleButton toggleButton;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.zbartest_scan_layout);
    ButterKnife.bind(this);
    initLayout();
}

private void initLayout() {
    mQRCodeView.setDelegate(this);
    mQRCodeView.startSpotAndShowRect();//显示扫描框，并且延迟1.5秒后开始识别
    toggleButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked) {
                mQRCodeView.openFlashlight();
            } else {
                mQRCodeView.closeFlashlight();
            }
        }
    });
}

@OnClick({R.id.line_back, R.id.scancode_localimg})
protected void onClickBtn(View view) {
    switch (view.getId()) {
        case R.id.line_back:
            finish();
            break;
        case R.id.scancode_localimg:
            Intent intent = new Intent();
            intent.setAction(Intent.ACTION_PICK);
            intent.setType("image/*");
            startActivityForResult(intent, 0x11);
            break;
        default:
            break;
    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_OK && requestCode == 0x11) {
        Uri uri = data.getData();
        String path = null;
        if (!TextUtils.isEmpty(uri.getAuthority())) {
            Cursor cursor = getContentResolver().query(uri,
                    new String[]{MediaStore.Images.Media.DATA}, null, null, null);
            if (null == cursor) {
                Toast.makeText(ZbarActivity.this, "图片没找到", Toast.LENGTH_SHORT).show();
                return;
            }
            cursor.moveToFirst();
            path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
            cursor.close();
        } else {
            path = uri.getPath();
        }
        if (null != path) {
            codeDiscriminate(path);
        } else {
            Toast.makeText(ZbarActivity.this, "图片路径为空", Toast.LENGTH_SHORT).show();
            return;
        }
    }
}

@Override
protected void onRestart() {
    mQRCodeView.startCamera();
    super.onRestart();
}

@Override
public void onResume() {
    super.onResume();
    mQRCodeView.startSpotAndShowRect();//显示扫描框，并且延迟1.5秒后开始识别
}

@Override
protected void onStop() {
    mQRCodeView.stopCamera();

//        mQRCodeView.closeFlashlight();
super.onStop();
}
private void vibrate() {
    Vibrator vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
    vibrator.vibrate(200);
}

private void codeDiscriminate(final String path) {
    new Thread(new Runnable() {

        @Override
        public void run() {
            Looper.prepare();
            String result = null;
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
                result = QRCodeDecoder.syncDecodeQRCode(path);
            } else {
                result = QRCodeDecoder.syncDecodeQRCode2(path);
            }
            Log.i("zbar_result", Build.VERSION.SDK_INT + "--->" + result);
            Message msg = mHandler.obtainMessage();
            //封装消息id
            msg.what = 1;//作为标示，便于接收消息
            msg.obj = result;
            mHandler.sendMessage(msg);//发送消息
        }
    }).start();
}


//创建一个Hander局部类对象，通过handleMessage()钩子方法来更新UI控件
Handler mHandler = new Handler() {

    public void handleMessage(Message msg) {
        //得到封装消息的id进行匹配
        if (1 == msg.what) {
            if (null != msg.obj)
                onScanQRCodeSuccess(msg.obj.toString());
        }
    }

};


@Override
protected void onDestroy() {
    mQRCodeView.onDestroy();
    ButterKnife.unbind(this);
    super.onDestroy();

}

@Override
public void onScanQRCodeSuccess(String result) {
    Log.i("zbar_result", "result:" + result);
    Toast.makeText(this, "二维码的数据：" + result, Toast.LENGTH_SHORT).show();
    vibrate();
    mQRCodeView.startSpot();
}

@Override
public void onScanQRCodeOpenCameraError() {
    Log.e("zbar_result", "打开相机出错");
    Toast.makeText(this, "打开相机出错", Toast.LENGTH_SHORT).show();
}

}