在以上活动中，我必须扫描两个不同的条形码并将其值分配给每个EditText。但是我做不到。我尝试了许多逻辑方法，但没有一个起作用。
activity_scan_qr.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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=".ScanQR">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:id="@+id/ref"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar2"
app:titleTextColor="#000000"
app:title="Scan Barcode"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.CardView
android:id="@+id/cv_qrcode"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:layout_marginEnd="16dp"
android:layout_marginStart="16dp"
android:elevation="10dp"
app:cardCornerRadius="50dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.482"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/ref"
app:layout_constraintVertical_bias="0.071">
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<SurfaceView
android:id="@+id/camera_pre"
android:layout_width="350dp"
android:layout_height="350dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="@+id/imageView9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="@+id/camera_pre"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="@+id/camera_pre"
app:layout_constraintTop_toTopOf="@+id/camera_pre"
app:srcCompat="@drawable/qr_overlay" />
</android.support.constraint.ConstraintLayout>
</android.support.v7.widget.CardView>
<EditText
android:id="@+id/beacon_edittext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="20dp"
android:background="@drawable/search_bar"
android:ems="10"
android:hint="Enter Beacon number"
android:inputType="textPersonName"
android:paddingBottom="5dp"
android:paddingLeft="50dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.491"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/cv_qrcode" />
<EditText
android:id="@+id/vin_edittext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:background="@drawable/search_bar"
android:ems="10"
android:hint="Enter VIN number"
android:inputType="textPersonName"
android:paddingBottom="5dp"
android:paddingLeft="50dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.491"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/beacon_edittext"
app:layout_constraintVertical_bias="0.0" />
<Button
android:id="@+id/assign"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="assign"
android:background="@drawable/assign"
android:textColor="@color/colorPrimary"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/vin_edittext" />
</android.support.constraint.ConstraintLayout>
ScanQR.java
package anaghesh.beacons_test;
import android.Manifest;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Vibrator;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.util.SparseArray;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
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;
// IMP: Google vision API used. Formats to be controlled
public class ScanQR extends AppCompatActivity {
SurfaceView cameraPreview;
EditText beacon,vin;
BarcodeDetector barcodeDetector;
CameraSource cameraSource;
Button assign;
public final static String BEACON_NUM="Beacon_num";
public final static String VIN_NUM="vin_num";
final int RequestCameraPermissionID = 1001;
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
cameraPreview = findViewById(R.id.camera_pre);
switch (requestCode) {
case RequestCameraPermissionID: {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
return;
}
try {
cameraSource.start(cameraPreview.getHolder());
} catch (IOException e) {
e.printStackTrace();
}
}
}
break;
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_scan_qr);
toolbarSetup();
cameraPreview = findViewById(R.id.camera_pre);
Log.e("error",""+cameraPreview);
beacon = findViewById(R.id.beacon_edittext);
beacon.setText("");//test
vin = findViewById(R.id.vin_edittext);
vin.setText("");//test
assign = findViewById(R.id.assign);
assign.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
SharedPreferences sharedPreferences = getSharedPreferences("Database", MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString(BEACON_NUM,beacon.getText().toString());
editor.putString(VIN_NUM,vin.getText().toString());
editor.apply();
final android.app.AlertDialog.Builder builder = new android.app.AlertDialog.Builder(ScanQR.this);
builder.setTitle("Checkin Successful");
// builder.setIcon(R.mipmap.ic_launcher);
builder.setMessage("Beacon No. "+sharedPreferences.getString(BEACON_NUM,"")+" is assigned to VIN "+sharedPreferences.getString(VIN_NUM,""))
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
finish();
}
});
android.app.AlertDialog alert = builder.create();
alert.show();
}
});
barcodeDetector = new BarcodeDetector.Builder(this)
// .setBarcodeFormats(Barcode.QR_CODE)
.build();
cameraSource = new CameraSource
.Builder(this, barcodeDetector)
.setRequestedPreviewSize(640, 480)
.build();
//Add Event
alert();
cameraPreview.getHolder().addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
if (ActivityCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
//Request permission
ActivityCompat.requestPermissions(ScanQR.this,
new String[]{Manifest.permission.CAMERA},RequestCameraPermissionID);
return;
}
try {
cameraSource.start(cameraPreview.getHolder());
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
}
@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
cameraSource.stop();
}
});
barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {
@Override
public void release() {
}
@Override
public void receiveDetections(Detector.Detections<Barcode> detections) {
final SparseArray<Barcode> qrcodes = detections.getDetectedItems();
if(qrcodes.size() != 0)
{
beacon.post(new Runnable() {
@Override
public void run() {
cameraSource.stop( );
Log.e("QR ",""+qrcodes.valueAt(0).displayValue);
Log.e("Beacon ",""+beacon.getText().toString());
Log.e("VIN ",""+vin.getText().toString());
if(beacon.getText().toString().isEmpty()) {
beacon.setText(qrcodes.valueAt(0).displayValue);
vinAlert();
}
else {
vin.setText(qrcodes.valueAt(0).displayValue);
}
Vibrator vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
vibrator.vibrate(100);
}
});
}
}
});
}
void toolbarSetup(){
Toolbar toolbar = findViewById(R.id.toolbar2);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
}
void alert(){
final android.app.AlertDialog.Builder builder = new android.app.AlertDialog.Builder(ScanQR.this);
builder.setTitle("Scan Beacon Barcode");
// builder.setIcon(R.mipmap.ic_launcher);
builder.setMessage("Please scan the beacon barcode")
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
}
});
android.app.AlertDialog alert = builder.create();
alert.show();
}
void vinAlert(){
final android.app.AlertDialog.Builder builder = new android.app.AlertDialog.Builder(ScanQR.this);
builder.setTitle("Scan Car Barcode");
// builder.setIcon(R.mipmap.ic_launcher);
builder.setMessage("Please scan the car barcode")
.setCancelable(false)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
restartCamera();
}
});
android.app.AlertDialog alert = builder.create();
alert.show();
}
@SuppressLint("MissingPermission")
public void restartCamera()
{
Log.e("method","Restart Camera");
try {
cameraSource.start();
} catch (IOException e) {
e.printStackTrace();
}
}
}