QR 扫描仪如何锁定焦点

问题描述

我正在尝试创建一个 Android 应用程序,它是 QR 扫描仪但具有锁定焦点。我有应用程序,但如何改变焦点?是否有可能将其设置为例如距相机 15 厘米的距离?或者放一些值来设置焦点,只是为了关闭自动对焦。

代码: 主要活动


import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Camera;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;

import java.util.List;

public class MainActivity extends AppCompatActivity {

    private Button scan_btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);



        scan_btn = (Button) findViewById(R.id.scan_btn);
        //final Activity activity = this;
        scan_btn.setonClickListener(new View.OnClickListener(){
            @Override
            public void onClick (View view)
            {
                IntentIntegrator integrator = new IntentIntegrator(
                        MainActivity.this
                );
               // integrator.setDesiredBarcodeFormats(IntentIntegrator.QR_CODE_TYPES);
                integrator.setPrompt("Scan");
                //integrator.setCameraId(0);
                integrator.setBeepEnabled(true);
                //integrator.setBarcodeImageEnabled(true);
                integrator.setorientationLocked(true);
                integrator.setCaptureActivity(Capture.class);


                integrator.initiateScan();



            }

        });

    }

    @Override
    protected void onActivityResult(int requestCode,int resultCode,@Nullable Intent data) {
        IntentResult result = IntentIntegrator.parseActivityResult(requestCode,resultCode,data);
        if(result != null){
            //chceck condition
            if(result.getContents()==null){

                Toast.makeText(this,"You cancelled the scanning",Toast.LENGTH_LONG).show();
            }
            else{
                Toast.makeText(this,result.getContents(),Toast.LENGTH_LONG).show();
            }
        }
        else {


            super.onActivityResult(requestCode,data);
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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=".MainActivity"
    android:focusable="false"
    android:focusableInTouchMode="false"
    >

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center|center_horizontal|center_vertical"
        android:text="Aplikacja do weryfikacji leków w KOWAL"
        android:textSize="25dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"

        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/scan_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="SCAN"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

</androidx.constraintlayout.widget.ConstraintLayout>

你能帮我解决这个问题吗?

解决方法

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