小编Anr*_*art的帖子

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); …