Sqcode 二维码

//主页

package com.example.mryang.myapplication;

import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.os.Build;
import android.os.PersistableBundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

import java.lang.ref.WeakReference;


import cn.bingoogolapple.qrcode.zxing.QRCodeEncoder;


public class MainActivity extends AppCompatActivity {
    private ImageView imageView;
    private EditText editText;

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

    private void initView() {
        imageView = findViewById(R.id.main_image);
        editText = findViewById(R.id.main_edit);
        findViewById(R.id.main_button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                startActivity(new Intent(MainActivity.this,ScanActivity.class));

                checkPermission();
            }
        });
        findViewById(R.id.get_ok).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                createQRCode();
            }
        });
    }
    private void checkPermission() {
        //第一步，判断系统版本是否为6.0以上
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){
            //第二步：checkSelfPermission判断有没有此权限
            //第一个参数：上下文
            //第二个参数：我们想要判断的权限，此处为相机权限
            if (ContextCompat.checkSelfPermission(this,Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED){
                //如果没授予，则申请权限
                //第一个：上下文
                //第二个：要申请的权限数组，此处为相机权限
                //第三个：请求码，startActivityForResult一样
                ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.CAMERA},100);
            }else{
                startActivity(new Intent(MainActivity.this,ScanActivity.class));
            }
        }
    }
    /**
     * 接受权限请求结果
     * @param requestCode 请求码
     * @param permissions 我们请求的权限数组
     * @param grantResults 返回结果数组
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == 100 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
            startActivity(new Intent(MainActivity.this,ScanActivity.class));
        }
    }
    private void createQRCode(){
        QRTask qrTask = new QRTask(this,imageView,editText);
        qrTask.execute(editText.getText().toString());
    }
    static class QRTask extends AsyncTask<String,Void,Bitmap>{

        private WeakReference<Context> mContext;
        private WeakReference<ImageView> mImageView;

        public QRTask(Context context,ImageView image,EditText editText){
            mContext = new WeakReference<>(context);
            mImageView = new WeakReference<>(image);
        }

        @Override
        protected Bitmap doInBackground(String... params) {
            String str = params[0];
            if (TextUtils.isEmpty(str)){
                return null;
            }
            //int pixelOffset = mContext.get().getResources().getDimensionPixelOffset(R.dimen.size);
            return QRCodeEncoder.syncEncodeQRCode(str,300);
        }

        @Override
        protected void onPostExecute(Bitmap bitmap) {
            super.onPostExecute(bitmap);
            if (bitmap != null){
                mImageView.get().setImageBitmap(bitmap);
            }else {
                Toast.makeText(mContext.get(),"不好意思，整不了",Toast.LENGTH_SHORT).show();
            }
        }
    }
}

//主页布局

<?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=".MainActivity">
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/main_button"
        android:text="扫yi扫"
        />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/main_edit"
        android:hint="请输入……"
        app:layout_constraintTop_toBottomOf="@id/main_button"
        />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/get_ok"
        android:text="生成"
        app:layout_constraintTop_toBottomOf="@id/main_edit"
        />
    <ImageView
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:id="@+id/main_image"
        android:src="@mipmap/ic_launcher"
        app:layout_constraintTop_toBottomOf="@id/get_ok"
        />

</android.support.constraint.ConstraintLayout>

//扫一扫 页面

package com.example.mryang.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import cn.bingoogolapple.qrcode.core.QRCodeView;
import cn.bingoogolapple.qrcode.zxing.ZXingView;

public class ScanActivity extends AppCompatActivity implements QRCodeView.Delegate {

    private ZXingView mZXingView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_scan);
        mZXingView = findViewById(R.id.zxingview);
        //设置代理
        mZXingView.setDelegate(this);
    }

    @Override
    protected void onResume() {
        super.onResume();
        //打开相机
        mZXingView.startCamera();
        //显示扫描框，并且延迟1.5秒后开始识别
        mZXingView.startSpotAndShowRect();
        //打开闪光灯
        mZXingView.openFlashlight();

    }

    @Override
    protected void onStop() {
        super.onStop();
        //关闭相机
        mZXingView.stopCamera();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mZXingView.onDestroy();
    }

    @Override
    public void onScanQRCodeSuccess(String result) {
        //成功
    }

    @Override
    public void onCameraAmbientBrightnessChanged(boolean isDark) {
        //环境改变 是否变暗  变暗为isDark 为 true
    }

    @Override
    public void onScanQRCodeOpenCameraError() {
        //打开手机失败
    }
}

// 扫一扫布局

<?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=".ScanActivity">
    <cn.bingoogolapple.qrcode.zxing.ZXingView
        android:id="@+id/zxingview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
</android.support.constraint.ConstraintLayout>