【发布时间】：2017-09-27 20:15:51
【问题描述】：
在我的应用程序依赖项中
编译'com.google.android.gms:play-services:11.0.4'
在清单文件中我有
<uses-permission android:name="android.permission.CAMERA" /> <uses-feature android:name="android.hardware.camera" /> <uses-feature android:name="android.hardware.camera.autofocus" />
这是我的 activity_main.xml 文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="cameratest.test.hasan.com.barcodetest.MainActivity">
<EditText
android:id="@+id/editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="text"
android:text="Name"
android:layout_marginTop="107dp"
android:layout_marginEnd="39dp" />
<RelativeLayout
android:id="@+id/cameraHolder"
android:layout_width="176dp"
android:layout_height="144dp"
android:layout_marginEnd="75dp"
android:layout_marginTop="74dp"
android:keepScreenOn="true"></RelativeLayout>
</RelativeLayout>
MainActivity.java
public class MainActivity extends AppCompatActivity {
CameraSurface cameraSurface;
RelativeLayout relativeLayout;
EditText etBarkod ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
etBarkod = (EditText)findViewById(R.id.editText);
etBarkod.setOnEditorActionListener(new BarkodEditorActionListener(this.getBaseContext()));
relativeLayout = (RelativeLayout)findViewById(R.id.cameraHolder);
relativeLayout.setOnTouchListener(new MovingViewListener());
cameraSurface = new CameraSurface(this.getBaseContext());
cameraSurface.setBarkodEditText(etBarkod);
relativeLayout.addView(cameraSurface);
}
}
CameraSurface.java 类是
public class CameraSurface extends SurfaceView implements SurfaceHolder.Callback {
Context context;
Camera mCamera;
CameraSource cameraSource;
SurfaceHolder msurfaceHolder;
EditText etBarkod;
public CameraSurface(Context context) {
super(context);
super.setKeepScreenOn(true);
this.context = context;
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT,RelativeLayout.LayoutParams.MATCH_PARENT);
super.setLayoutParams(params);
msurfaceHolder = this.getHolder();
msurfaceHolder.addCallback(this);
msurfaceHolder.setKeepScreenOn(true);
msurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
attachBarcodeDetector();
}
@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
mCamera = Camera.open(Camera.CameraInfo.CAMERA_FACING_BACK);
try {
mCamera.setPreviewDisplay(msurfaceHolder);
mCamera.startPreview();
} catch (Exception e) {
e.printStackTrace();
}
Camera.Parameters param;
param = mCamera.getParameters();
param.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
param.setPreviewFrameRate(0);
param.setPreviewSize(176, 144);
mCamera.setParameters(param);
try {
//noinspection MissingPermission
cameraSource.start(msurfaceHolder);
} catch (IOException e) {
e.printStackTrace();
}
}
private void attachBarcodeDetector(){
BarcodeDetector barcodeDetector =
new BarcodeDetector.Builder(context)
.setBarcodeFormats(Barcode.ALL_FORMATS)
.build();
cameraSource = new CameraSource
.Builder(context, barcodeDetector)
.setRequestedPreviewSize(176, 144)
.setAutoFocusEnabled(true)
.build();
barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {
@Override
public void release() {
}
@Override
public void receiveDetections(Detector.Detections<Barcode> detections) {
final EditText barkod= etBarkod;
final SparseArray<Barcode> barcodes = detections.getDetectedItems();
if (barcodes.size() != 0) {
barkod.post(new Runnable() { // Use the post method of the TextView
public void run() {
barkod.setText( // Update the TextView
barcodes.valueAt(0).displayValue
);
}
});
}
}
});
}
@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
}
@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
cameraSource.stop();
}
public EditText setBarkodEditText(EditText editText){
return this.etBarkod = editText;
}
}
相机工作正常，对焦很好，支持定义的预览大小，但条形码检测器不检测条形码，因此edittext值不会改变。
注意：这段代码运行良好，我真的不知道我改变了什么，但之后它就不再工作了。 我试图了解这段代码有什么问题，但我无法弄清楚。 所以我需要你的帮助。 提前致谢。
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标签： java android barcode-scanner google-vision