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在导入build.gradle中导入依赖

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.bwie.two_dimension_code"
        minSdkVersion 15
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    **configurations.all {
        resolutionStrategy.eachDependency { DependencyResolveDetails details ->
            def requested = details.requested
            if (requested.group == 'com.android.support') {
                if (!requested.name.startsWith("multidex")) {
                    details.useVersion '27.1.1' //这里改为你项目使用的版本即可
                }
            }
        }
    }**
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    **implementation 'com.android.support:design:27.1.1'//加入两个依赖
    compile 'cn.yipianfengye.android:zxing-library:1.9'**
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

主布局：主要写输入框和搜索框以及生成二维码的框架

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.bwie.two_dimension_code.MainActivity"
    android:orientation="vertical">
  <LinearLayout
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:orientation="horizontal">

    <EditText
        android:id="@+id/sou"
        android:layout_width="300dp"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="搜索"/>
  </LinearLayout>
  <ImageView
      android:id="@+id/img"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="center"/>
</LinearLayout>

主类功能模块

package com.bwie.two_dimension_code;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;

import com.uuzuche.lib_zxing.activity.CodeUtils;

public class MainActivity extends AppCompatActivity {

    private EditText sou;
    private Button btn;
    private ImageView img;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //找控件
        sou = findViewById(R.id.sou);
        btn = findViewById(R.id.btn);
        img = findViewById(R.id.img);
        //输入内容后点击搜索生成一个二维码
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String s = sou.getText().toString();

                if (TextUtils.isEmpty(s)){
                    return;
                }
                Bitmap bitmap = CodeUtils.createImage(s, 400, 400, BitmapFactory.decodeResource(getResources(), R.mipmap.airen));
                img.setImageBitmap(bitmap);
            }
        });
    }
}