android–CameraSource .setAutoFocusEnabled(true)返回：虽然设备支持自动对焦,但此设备不支持相机自动对焦

概述下面是我的条码扫描器活动,除了setAutoFocusEnabled(true)之外,一切正常.它在运行时返回一条消息,说明我的设备不支持自动对焦,尽管三星TabET561是一个支持自动对焦的设备.importandroid.os.Bundle;importandroid.support.v7.app.AppCompatActivity;importandroid.util.Lo

下面是我的条码扫描器活动,除了setautoFocusEnabled(true)之外,一切正常.它在运行时返回一条消息,说明我的设备不支持自动对焦,尽管三星Tab E T561是一个支持自动对焦的设备.

import androID.os.Bundle;import androID.support.v7.app.AppCompatActivity;import androID.util.Log;import androID.util.SparseArray;import androID.vIEw.SurfaceHolder;import androID.vIEw.SurfaceVIEw;import androID.vIEw.VIEw;import androID.Widget.EditText;import com.Google.androID.gms.vision.CameraSource;import com.Google.androID.gms.vision.Detector;import com.Google.androID.gms.vision.barcode.barcode;import com.Google.androID.gms.vision.barcode.barcodeDetector;import java.io.IOException;import static com.Google.androID.gms.vision.CameraSource.CAMERA_FACING_BACK;import static com.Google.androID.gms.vision.CameraSource.CAMERA_FACING_FRONT;public class ScanbarcodeActivity extends AppCompatActivity {    private String TAG = "ScanbarcodeActivity";    private barcodeDetector barcodeDetector;    private SurfaceVIEw cameraview;    private CameraSource cameraSource;    private EditText cardNo;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_scan_barcode);    }    @OverrIDe    protected voID onResume() {        cameraview = (SurfaceVIEw) findVIEwByID(R.ID.surfaceVIEwCamera);        cardNo = (EditText) findVIEwByID(R.ID.editTextbarcode);        scanbarcodeCam(0);        super.onResume();    }    @OverrIDe    protected voID onDestroy() {        if(cameraSource != null) {            cameraSource.stop();            cameraSource.release();            cameraSource = null;        }        super.onDestroy();    }    public voID switchCam(VIEw vIEw) {        if(cameraSource.getCameraFacing() == CAMERA_FACING_BACK) {            cameraSource.stop();            cameraSource.release();            cameraSource = null;            scanbarcodeCam(0);            Log.i(TAG, "switchCam to front");        } else {            cameraSource.stop();            cameraSource.release();            cameraSource = null;            scanbarcodeCam(1);            Log.i(TAG, "switchCam to back");        }    }    public voID scanbarcodeCam(int cam) {        if(barcodeDetector == null) {            barcodeDetector = new barcodeDetector.Builder(this)                    .setbarcodeFormats(barcode.EAN_13)                    .build();        }        if(cam == 0) {            cameraSource = new CameraSource                    .Builder(this, barcodeDetector)                    .setRequestedPrevIEwSize(640, 480)                    .setFacing(CAMERA_FACING_FRONT)                    .setRequestedFps(30.0f)                    .build();        } else if(cam == 1) {            cameraSource = new CameraSource                    .Builder(this, barcodeDetector)                    .setRequestedPrevIEwSize(640, 480)                    .setFacing(CAMERA_FACING_BACK)                    .setRequestedFps(30.0f)                    .setautoFocusEnabled(true)                    .build();        }        if(!cameraview.getHolder().getSurface().isValID()) {            Log.i(TAG, "*** new SurfaceHolder");            cameraview.getHolder().addCallback(new SurfaceHolder.Callback() {                @OverrIDe                public voID surfaceCreated(SurfaceHolder holder) {                    try {                        cameraSource.start(cameraview.getHolder());                    } catch (IOException | RuntimeException e) {                        Log.e(TAG, e.getMessage());                    }                }                @OverrIDe                public voID surfaceChanged(SurfaceHolder holder, int format, int wIDth, int height) {                }                @OverrIDe                public voID surfaceDestroyed(SurfaceHolder holder) {                    if (cameraSource != null) {                        cameraSource.stop();                        cameraSource.release();                        cameraSource = null;                    }                }            });        } else {            try {                cameraSource.start(cameraview.getHolder());            } catch(IOException e) {                Log.e(TAG, e.getMessage());            }        }        barcodeDetector.setProcessor(new Detector.Processor<barcode>() {            @OverrIDe            public voID release() {            }            @OverrIDe            public voID receiveDetections(Detector.Detections<barcode> detections) {                final SparseArray<barcode> barcodes = detections.getDetectedItems();                if(barcodes.size() != 0) {                    cardNo.post(new Runnable() {                        @OverrIDe                        public voID run() {                            cardNo.setText(barcodes.valueAt(0).displayValue);                        }                    });                }            }        });    }}

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解决方法:

所以经过两天的奋斗,我终于设法“炮制”了一个修复.但AndroID开发团队应该认真研究为什么setautoFocusEnabled(true)在使用auto Focus的设备上不起作用.

这是我的修复,希望它能节省一些时间：

@OverrIDepublic boolean ontouchEvent(MotionEvent event) {    if(event.getAction() == MotionEvent.ACTION_UP) {        float x =  event.getX();        float y = event.getY();        float touchMajor = event.gettouchMajor();        float touchMinor = event.gettouchMinor();        Rect touchRect = new Rect((int)(x - touchMajor / 2), (int)(y - touchMinor / 2), (int)(x + touchMajor / 2), (int)(y + touchMinor / 2));        this.submitFocusAreaRect(touchRect);    }    return super.ontouchEvent(event);}private voID submitFocusAreaRect(final Rect touchRect) {    FIEld[] declaredFIElds = CameraSource.class.getDeclaredFIElds();    for (FIEld fIEld : declaredFIElds) {        if (fIEld.getType() == Camera.class) {            fIEld.setAccessible(true);            try {                Camera camera = (Camera) fIEld.get(cameraSource);                if (camera != null) {                    Camera.Parameters cameraParameters = camera.getParameters();                    if(cameraParameters.getMaxnumFocusAreas() == 0) {                        return;                    }                    Rect focusArea = new Rect();                    focusArea.set(touchRect.left * 2000 / cameraview.getWIDth() - 1000,                            touchRect.top * 2000 / cameraview.getHeight() - 1000,                            touchRect.right * 2000 / cameraview.getWIDth() - 1000,                            touchRect.bottom * 2000 / cameraview.getHeight() - 1000);                    ArrayList<Camera.Area> focusAreas = new ArrayList<>();                    focusAreas.add(new Camera.Area(focusArea, 1000));                    cameraParameters.setFocusMode(Camera.Parameters.FOCUS_MODE_auto);                    cameraParameters.setFocusAreas(focusAreas);                    camera.setParameters(cameraParameters);                    camera.autoFocus(this);                }            } catch (illegalaccessexception | RuntimeException e) {                e.getMessage();            }            break;        }    }}

现在我也可以使用后置摄像头扫描条形码.好极了！

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