android studio生成二维码、扫描二维码_android studio扫二维码功能

首先介绍一下，我做的这个比较简单，是参照其他UP主的。大概就是，先输入文字，获取文字内容，点击生成二维码，扫描生成的二维码获取输入的文字。

一、添加第三方插件：app下的

implementation'com.google.zxing:core:3.3.3'
implementation'com.journeyapps:zxing-android-embedded:3.6.0'
implementation'com.google.zxing:javase:3.0.0'

二、在添加 

<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera2" />
<uses-feature android:name="android.hardware.camera2.autofocus" />

三、布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    android:gravity="center"
    tools:context=".MainActivity">
 
 
<ImageView
    android:layout_width="200dp"
    android:layout_height="200dp"
    android:id="@+id/qr"/>
    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/creat"
        android:hint="要生成二维码的文字"
        android:layout_marginTop="20dp"
        android:textSize="20dp"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="生成"
        android:id="@+id/sc"
        android:layout_marginTop="20dp"
        />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="扫描"
        android:id="@+id/smiao"
        android:layout_marginTop="20dp"
        />
 
</LinearLayout>

四、逻辑代码

package com.example.shaomiao;
 
import androidx.appcompat.app.AppCompatActivity;
 
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.renderscript.Matrix2f;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
 
import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.journeyapps.barcodescanner.BarcodeEncoder;
 
public class MainActivity extends AppCompatActivity {
    private ImageView qr;
    private EditText creat;
    private Button sc;
    private Button smiao;
 
 
 
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        qr = (ImageView) findViewById(R.id.qr);
        creat = (EditText) findViewById(R.id.creat);
        sc = (Button) findViewById(R.id.sc);
        smiao = (Button) findViewById(R.id.smiao);
        sc.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                gener(creat.getText().toString());//获取输入内容
            }
        });
        smiao.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity.this, MainActivity2.class);
                startActivity(intent);
            }
        });
    }
 
    private void gener(String text) {
        MultiFormatWriter multiFormatWriter=new MultiFormatWriter();
        try{
            BitMatrix bitMatrix=multiFormatWriter.encode(text, BarcodeFormat.QR_CODE,200,200);
            BarcodeEncoder barcodeEncoder=new BarcodeEncoder();
            Bitmap bitmap=barcodeEncoder.createBitmap(bitMatrix);
            qr.setImageBitmap(bitmap);
        } catch (WriterException e) {
            e.printStackTrace();
        }
    }
}

 五、创建一个空活动，在逻辑代码中

package com.example.shaomiao;
 
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
 
import android.content.Intent;
import android.os.Bundle;
import android.widget.Toast;
 
import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;
 
public class MainActivity2 extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
 
        IntentIntegrator intentIntegrator=new IntentIntegrator(this);
        intentIntegrator.setDesiredBarcodeFormats(IntentIntegrator.QR_CODE);
        intentIntegrator.setPrompt("Scan a QR Code");
        intentIntegrator.setCameraId(0);
        intentIntegrator.setBeepEnabled(false);
        intentIntegrator.setOrientationLocked(true);
        intentIntegrator.initiateScan();
    }
 
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        IntentResult result=IntentIntegrator.parseActivityResult(requestCode,resultCode,data);
        if(result !=null && result.getContents() !=null){
            String sca=result.getContents();
            Toast.makeText(this, "扫描结果"+sca, Toast.LENGTH_SHORT).show();
        }
    }
}

我们生活中的二维码，就微信来说，它是点击二维码名片，生成二维码的，里面就是自己布局一下。扫码是点击扫一扫，出现扫码框，然后布局一下。但扫一扫功能强大，可以识别的多，列如：图片、支付码，返回的是一个动态活动，而我们这个返回的是静态。这个大家可以一起探讨一下。