二維碼掃描

這個庫的效果很風騷。掃描框，掃描線等風格很多都可以自定義，而且也支持條形碼識別。
第一步：

compile 'com.google.zxing:core:3.3.0'
compile 'cn.bingoogolapple:bga-qrcodecore:latestVersion@aar'
compile 'cn.bingoogolapple:bga-zxing:latestVersion@aar'

這個latestVersion換成最新的就行了，當前是1.1.9。
第二步：
xml中添加：

<cn.bingoogolapple.qrcode.zxing.ZXingView
        android:id="@+id/zxingview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:qrcv_animTime="1500"
        app:qrcv_barcodeRectHeight="120dp"
        app:qrcv_borderColor="@android:color/white"
        app:qrcv_borderSize="1dp"
        app:qrcv_cornerColor="@color/colorPrimaryDark"
        app:qrcv_cornerLength="20dp"
        app:qrcv_cornerSize="4dp"
        app:qrcv_isBarcode="false"
        app:qrcv_isCenterVertical="false"
        app:qrcv_isOnlyDecodeScanBoxArea="true"
        app:qrcv_isScanLineReverse="false"
        app:qrcv_isShowDefaultGridScanLineDrawable="true"
        app:qrcv_isShowDefaultScanLineDrawable="true"
        app:qrcv_maskColor="#33FFFFFF"
        app:qrcv_qrCodeTipText="將二維碼置於掃描框內，即可自動掃描"
        app:qrcv_isTipTextBelowRect="true"
        app:qrcv_tipTextColor="@android:color/white"
        app:qrcv_tipTextSize="14sp"
        app:qrcv_isShowTipBackground="true"
        app:qrcv_isShowTipTextAsSingleLine="false"
        app:qrcv_rectWidth="220dp"
        app:qrcv_scanLineColor="@android:color/white"
        app:qrcv_scanLineMargin="0dp"
        app:qrcv_scanLineSize="1dp"
        app:qrcv_topOffset="100dp"/>

好多屬性都可以自定義，具體不多說了，可以去點上面的鏈接去作者庫裏看，很拉風~
第三步：開啓掃描即可。下面是掃描的Activity。

public class CaptureActivity extends Activity implements QRCodeView.Delegate {
    private QRCodeView qrCodeView;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_capture);
        initView();
    }

    private void initView() {
        qrCodeView = findViewById(R.id.zxingview);
        qrCodeView.setDelegate(this);
        qrCodeView.startCamera();
        qrCodeView.showScanRect();
        qrCodeView.startSpot();//開啓掃描識別功能
    }

    /**
     * @param result 識別成功後的結果回調
     */
    @Override
    public void onScanQRCodeSuccess(String result) {
        //實現震動(不需要可以不寫)
        Vibrator vibrator = (Vibrator) getSystemService(VIBRATOR_SERVICE);
        vibrator.vibrate(200);
        Toast.makeText(this, result, Toast.LENGTH_SHORT).show();
        qrCodeView.startSpot();//實現連續掃(不需要可以不寫)
    }

    @Override
    public void onScanQRCodeOpenCameraError() {

    }

    @Override
    protected void onStop() {
        super.onStop();
        qrCodeView.stopCamera();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        qrCodeView.onDestroy();
    }

    /**
     * @param view
     * 打開相冊選擇二維碼圖片識別掃描
     */
    public void qrScanFromAlbum(View view) {
        Intent intent = new Intent(Intent.ACTION_PICK, null);
        intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
        startActivityForResult(intent, 1);
    }

    /**
     * @param requestCode
     * @param resultCode
     * @param data
     * 相冊選擇二維碼圖片掃描後識別結果的回調
     */
    @Override
    protected void onActivityResult(int requestCode, int resultCode, final Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        qrCodeView.startCamera();
        qrCodeView.showScanRect();
        qrCodeView.startSpot();//開啓掃描識別功能
        if (resultCode == Activity.RESULT_OK && requestCode == 1) {
            new AsyncTask<Void, Void, String>() {
                @Override
                protected String doInBackground(Void... params) {
                    try {
                        return QRCodeDecoder.syncDecodeQRCode(getPicPath(data.getData()));
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    return "";
                }

                @Override
                protected void onPostExecute(String result) {
                    if (TextUtils.isEmpty(result)) {
                        Toast.makeText(CaptureActivity.this, "未發現二維碼", Toast.LENGTH_SHORT).show();
                    } else {
                        Toast.makeText(CaptureActivity.this, result, Toast.LENGTH_SHORT).show();
                    }
                }
            }.execute();
        }
    }

    /**
     * @param selectedImage
     * @return
     * @throws Exception 獲取選擇圖片的path
     */
    private String getPicPath(Uri selectedImage) throws Exception {
        Cursor cursor = this.getContentResolver().query(selectedImage, (String[]) null, (String) null, (String[]) null, (String) null);
        String picturePath;
        if (cursor != null) {
            cursor.moveToFirst();
            int file = cursor.getColumnIndex("_data");
            picturePath = cursor.getString(file);
            cursor.close();
            cursor = null;
        } else {
            File file1 = new File(selectedImage.getPath());
            picturePath = file1.getAbsolutePath();
        }
        return picturePath;
    }
}

最後：清單文件的相機和讀寫權限別忘了動態獲取一下，如果需要震動，也添加一下震動的權限，如下：

 <uses-permission android:name="android.permission.CAMERA"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.VIBRATE"/>
    <uses-feature android:name="android.hardware.camera"/>
    <uses-feature android:name="android.hardware.camera.autofocus"/>