Android 二维码扫描

有个比较易用的Android 二维码扫描的开源库：

https://github.com/bingoogolapple/BGAQRCode-Android

它也是基于谷歌的zxing开源库的：

https://github.com/zxing/zxing

在grandle中添加依赖库：

compile 'pub.devrel:easypermissions:0.1.7'//用于请求相机权限
compile 'com.google.zxing:core:3.2.1'     //谷歌的zxing库
compile 'cn.bingoogolapple:bga-qrcodecore:1.1.7@aar'//bingoogolapple的库
compile 'cn.bingoogolapple:bga-zxing:1.1.7@aar'

public class MainActivity extends AppCompatActivity implements EasyPermissions.PermissionCallbacks,QRCodeView.Delegate{
    private static final String TAG = "ActionsQRScanActivity";
    private static final int REQUEST_CODE_QRCODE_PERMISSIONS = 1;
    private long clickTime = 0; //记录第一次点击的时间

    private QRCodeView mQRCodeView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mQRCodeView = (ZXingView) findViewById(R.id.zxingview);
        mQRCodeView.setDelegate(this);

    }

    @Override
    protected void onStart() {
        super.onStart();
        requestCodeQRCodePermissions();
        mQRCodeView.startCamera();
        mQRCodeView.startSpot();
    }

    @Override
    protected void onResume(){
        mQRCodeView.showScanRect();
        super.onResume();
    }

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

    @Override
    public void onScanQRCodeSuccess(String result) {
        Log.i(TAG, "result:" + result);

    }

    @Override
    public void onScanQRCodeOpenCameraError() {
        Log.e(TAG, "open camera error!");
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
    }

    @Override
    public void onPermissionsGranted(int requestCode, List<String> perms) {
    }

    @Override
    public void onPermissionsDenied(int requestCode, List<String> perms) {
    }

    @AfterPermissionGranted(REQUEST_CODE_QRCODE_PERMISSIONS)
    private void requestCodeQRCodePermissions() {
        String[] perms = {Manifest.permission.CAMERA};
        if (!EasyPermissions.hasPermissions(this, perms)) {
            EasyPermissions.requestPermissions(this, getResources().getString(R.string.qrcode_permission), REQUEST_CODE_QRCODE_PERMISSIONS, perms);
        }
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            exit();
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }

    private void exit() {
        if ((System.currentTimeMillis() - clickTime) > 2000) {
            Toast.makeText(getApplicationContext(), getResources().getString(R.string.exit_message),
                    Toast.LENGTH_SHORT).show();
            clickTime = System.currentTimeMillis();
        } else {
            Log.e(TAG, "exit application");
            this.finish();
        }
    }


    

}

Activity主要实现的接口如下：

public interface PermissionCallbacks extends
                                         ActivityCompat.OnRequestPermissionsResultCallback {//授权成功失败回调

        void onPermissionsGranted(int requestCode, List<String> perms);

        void onPermissionsDenied(int requestCode, List<String> perms);

    }

public interface Delegate {//扫码成功返回的结果是result，打开相机失败的回调
        /**
         * 处理扫描结果
         *
         * @param result
         */
        void onScanQRCodeSuccess(String result);

        /**
         * 处理打开相机出错
         */
        void onScanQRCodeOpenCameraError();
    }

xml文件中的ZxingView

<?xml version="1.0" encoding="utf-8"?>
    <cn.bingoogolapple.qrcode.zxing.ZXingView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/zxingview"
        style="@style/MatchWrap"
        app:qrcv_animTime="1000"
        app:qrcv_barCodeTipText="将条码放入框内，即可自动扫描"
        app:qrcv_barcodeRectHeight="140dp"
        app:qrcv_borderColor="@android:color/white"
        app:qrcv_borderSize="1dp"
        app:qrcv_cornerColor="@color/colorPrimaryDark"
        app:qrcv_cornerLength="20dp"
        app:qrcv_cornerSize="3dp"
        app:qrcv_customScanLineDrawable="@drawable/scan_icon_scanline"
        app:qrcv_isBarcode="false"
        app:qrcv_isCenterVertical="false"
        app:qrcv_isOnlyDecodeScanBoxArea="false"
        app:qrcv_isScanLineReverse="true"
        app:qrcv_isShowDefaultGridScanLineDrawable="false"
        app:qrcv_isShowDefaultScanLineDrawable="true"
        app:qrcv_isShowTipBackground="true"
        app:qrcv_isShowTipTextAsSingleLine="false"
        app:qrcv_isTipTextBelowRect="false"
        app:qrcv_maskColor="#33FFFFFF"
        app:qrcv_qrCodeTipText="@string/scan_tips"
        app:qrcv_rectWidth="200dp"
        app:qrcv_scanLineColor="@color/colorPrimaryDark"
        app:qrcv_scanLineMargin="0dp"
        app:qrcv_scanLineSize="0.5dp"
        app:qrcv_tipTextColor="@android:color/white"
        app:qrcv_tipTextSize="12sp"
        app:qrcv_toolbarHeight="56dp"
        app:qrcv_topOffset="60dp"/>

自定义属性代码的含义在这里可以找到：https://github.com/bingoogolapple/BGAQRCode-Android

感觉还是很简单的