MVP+SQCode_sq code-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_43588945/article/details/84930937

本文深入探讨了MVP（Model-View-Presenter）模式在Android应用开发中的应用，详细讲解了MVP模式的组成部分：Model、View和Presenter，以及它们之间的交互方式。文章还提供了具体的代码示例，展示了如何使用MVP模式进行登录功能的实现，包括网络请求、数据处理和UI更新的过程。

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//VIEW 层接口

public interface IView<T> {

    void showRespomnseData(T data);

    void success (String msg);

    void fail(String msg);
}

//主页

package com.example.mvp03;

import android.Manifest;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.os.Build;
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.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.Toast;

import com.example.mvp03.IView.IView;
import com.example.mvp03.Presenter.IPresenterlmpl;

public class MainActivity extends AppCompatActivity implements IView {
        private Button button_login;
        private EditText edit_mobile,edit_pwd;
        private IPresenterlmpl iPresenterlmpl;
        private String edit1;
        private String edit2;
        private CheckBox checkBox1,checkBox2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        iPresenterlmpl = new IPresenterlmpl(this);
        initView();
        //自动登录  记住密码
        SharedPreferences sharedPreferences = getSharedPreferences("User",MODE_PRIVATE);
        final SharedPreferences.Editor editor = sharedPreferences.edit();
        //开始前就要判断是否记住了密码
        boolean isc = sharedPreferences.getBoolean("isc", false);
        if (isc){
            //记住了密码以后  按钮是要设置为可以点击的
            button_login.setEnabled(true);
            //若是通过就代表之前记住密码了 就拿到 之前存的值 赋值上去
            String mobile = sharedPreferences.getString("mobile", null);
            String pwd = sharedPreferences.getString("pwd", null);
            //获取到输入框的值 为moblie  在记住密码以后再次打开时 把moblie 存到输入框里
            edit_mobile.setText(mobile);
            edit_pwd.setText(pwd);
            checkBox1.setChecked(true);
        }
        //判断是否是自动登录  判断的条件是之前点击过 自动登录没有
        boolean isv = sharedPreferences.getBoolean("isv",false);
        if (isv){
            startActivity(new Intent(MainActivity.this,ShowActivity.class));
        }
        checkBox1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked == false){
                    checkBox2.setChecked(false);
                }
            }
        });
        checkBox2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked){
                    checkBox1.setChecked(true);
                }
            }
        });
        button_login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
             //获取输入框的值
                edit1 = edit_mobile.getText().toString();
                edit2 = edit_pwd.getText().toString();
                //记住密码
                if (checkBox1.isChecked()){
                    editor.putBoolean("isc",true);
                    editor.putString("mobile",edit1);
                    editor.putString("pwd",edit2);
                    //提交
                    editor.commit();
                }
                //自动登录 是否勾选
                if (checkBox2.isChecked()){
                    //获取自动登录的状态值
                    editor.putBoolean("isv",true);
                    editor.commit();
                }
                //判断网络权限
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){
                    if (ContextCompat.checkSelfPermission(MainActivity.this,Manifest.permission.INTERNET) != PackageManager.PERMISSION_GRANTED){
                        ActivityCompat.requestPermissions(MainActivity.this,new String[]{Manifest.permission.INTERNET},100);
                    }else {
                        setData();
                    }
                }else {
                    setData();
                }
            }
        });

    }
    private void setData() {
        //开启
        iPresenterlmpl.startCheck(edit1,edit2);
    }
    //初始化视图
    private void initView() {
        //获取资源ID
        button_login = findViewById(R.id.login);
        edit_mobile = findViewById(R.id.mobile);
        edit_pwd = findViewById(R.id.password);
        checkBox1 = findViewById(R.id.jizhu);
        checkBox2 = findViewById(R.id.zidong);

        edit_mobile.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
            }
            @Override
            public void afterTextChanged(Editable s) {
                if (edit_mobile.getText().toString().length() >=11 ){
                    button_login.setEnabled(true);
                }
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (iPresenterlmpl != null){
            iPresenterlmpl.onDatech();
        }
    }

    @Override
    public void showRespomnseData(Object data) {

    }

    @Override
    public void success(String msg) {
        Toast.makeText(this,""+msg,Toast.LENGTH_LONG).show();
        startActivity(new Intent(MainActivity.this,ShowActivity.class));

    }
    @Override
    public void fail(String msg) {
        Toast.makeText(this,""+msg,Toast.LENGTH_LONG).show();
    }
    @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){
            setData();
        }
    }
}

//Presenter 接口

public interface IPresenter {
    void startRequsert1(String url , String params);
    void startRequsert2(String url , String params);
}

//Presenter 实现

package com.example.mvp03.Presenter;

import com.example.mvp03.Bean.LoginBean;
import com.example.mvp03.CallBack.MyCallBack;
import com.example.mvp03.IView.IView;
import com.example.mvp03.Model.IModellmpl;

public class IPresenterlmpl implements  IPresenter {
        IModellmpl iModellmpl;
        IView iView;
        private String urlStr = "http://www.xieast.com/api/user/login.php?username=%s&password=%s";

    public IPresenterlmpl( IView iView) {
        this.iView = iView;
        //实例化Model层
        iModellmpl = new IModellmpl();
    }

    @Override
    public void startRequsert1(String url, String params) {
        iModellmpl.toRequest1(url, new MyCallBack() {
            @Override
            public void setData(Object data) {
                iView.showRespomnseData(data);
            }
        });
    }

    @Override
    public void startRequsert2(String url, String params) {
        iModellmpl.toRequest2(url, new MyCallBack() {
            @Override
            public void setData(Object data) {
                iView.showRespomnseData(data);
            }
        });
    }
    //验证用户名和密码
    public void startCheck(String s1 ,String s2){
        iModellmpl.toRequest1(String.format(urlStr,s1,s2), new MyCallBack<LoginBean>() {
            @Override
            public void setData(LoginBean data) {
                if (data.getCode() == 100){
                    iView.success("您已登录成功");
                }else{
                    iView.fail(data.getMsg());
                }
            }
        });
    }

    public void onDatech(){
        if (iModellmpl != null){
            iModellmpl = null;
        }
        if (iView != null){
            iView = null;
        }
    }
}

//Model 层接口

public interface IModel {
    // 请求登录
    public void  toRequest1(String url, MyCallBack myCallBack);
    // 请求数据
    public void  toRequest2(String url,MyCallBack myCallBack);
}

//Model 层实现类


public class IModellmpl implements IModel {
    private MyCallBack myCallBack;


    //登录
    @Override
    public void toRequest1(String url, final MyCallBack myCallBack) {
        HttpUtil.getInstance().getRequsert(url, LoginBean.class, new HttpUtil.Callbak<LoginBean>() {
            @Override
            public void onSuccess(LoginBean loginBean) {
                myCallBack.setData(loginBean);
            }
        });
    }

    @Override
    public void toRequest2(String url, final MyCallBack myCallBack) {
        HttpUtil.getInstance().getRequsert(url, ShowDataBean.class, new HttpUtil.Callbak<ShowDataBean>() {

            @Override
            public void onSuccess(ShowDataBean showDataBean) {
                myCallBack.setData(showDataBean);
            }
        });
    }
}

//接口回调

public interface MyCallBack<T> {
    void setData(T data);
}

//工具类

package com.example.mvp03.NetUtil;

import android.os.AsyncTask;

import com.google.gson.Gson;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class HttpUtil {

    private Gson gson;

    //单例
    private static HttpUtil instance;

    //创建私有构造
    private HttpUtil(){
        gson = new Gson();
    }
    //提供静态方法
    public static HttpUtil getInstance(){
        if (instance == null){
            instance = new HttpUtil();
        }
        return instance;
    }
    //定义一个接口
    public interface Callbak<T>{
        void onSuccess(T t);
    }
    //提供一个接口
    public void  getRequsert(final String urlStr,final Class clazz,final Callbak callbak){
        new AsyncTask<String,Void,Object>(){

            @Override
            protected Object doInBackground(String... strings) {
                return getRequsert(urlStr,clazz);
            }

            @Override
            protected void onPostExecute(Object a) {
                callbak.onSuccess(a);
            }
        }.execute(urlStr);
    }

    //创建GSon解析的方法
    public <T> T getRequsert(String urlStr,Class clazz){
        return (T) gson.fromJson(getRequsert(urlStr),clazz);
    }

    //创建网络请求的方法
    public String getRequsert(String urlStr){
        String result = "";
        try {
            URL url = new URL(urlStr);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setReadTimeout(5000);
            urlConnection.setConnectTimeout(5000);
            urlConnection.setRequestMethod("GET");
            int responseCode = urlConnection.getResponseCode();
            if (responseCode == 200){
                result = stream2String(urlConnection.getInputStream());
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
    private  String stream2String(InputStream inputStream) throws IOException {
        InputStreamReader is  =new InputStreamReader(inputStream);
        BufferedReader br = new BufferedReader(is);
        StringBuilder sb = new StringBuilder();
        for (String tmp = br.readLine(); tmp != null; tmp = br.readLine()){
            sb.append(tmp);
        }
        return sb.toString();
    }
}

//登录的Bean类

public class LoginBean {
    public String msg;
    public int code;

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }
}

//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">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="60dp"
            android:textSize="25dp"
            android:text="登录页面"
            android:gravity="center"/>

        <EditText
            android:padding="10dp"
            android:layout_width="match_parent"
            android:hint="请输入手机号"
            android:layout_height="60dp"
            android:id="@+id/mobile"/>

        <EditText
            android:layout_width="match_parent"
            android:layout_height="60dp"
            android:hint="请输入密码"
            android:id="@+id/password"/>

        <LinearLayout
            android:layout_width="match_parent"
            android:orientation="vertical"
            android:layout_height="wrap_content">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">

                <CheckBox
                    android:id="@+id/jizhu"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:text="记住密码" />

                <CheckBox
                    android:id="@+id/zidong"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:text="自动登录" />
            </LinearLayout>

            <Button
                android:id="@+id/login"
                android:text="登录"
                android:enabled="false"
                android:layout_weight="1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />
        </LinearLayout>
    </LinearLayout>
</android.support.constraint.ConstraintLayout>

//showActicity

package com.example.mvp03;

import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import com.example.mvp03.Adapter.FragmentAdapter;

public class ShowActivity extends AppCompatActivity {
    private ViewPager viewPager;
    private TabLayout tabLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_show);
        viewPager = findViewById(R.id.pager_show);
        tabLayout = findViewById(R.id.tab);
        tabLayout.setupWithViewPager(viewPager);
        FragmentAdapter adapter = new FragmentAdapter(getSupportFragmentManager());
        viewPager.setAdapter(adapter);
    }
}\

//展示页面布局

<?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=".ShowActivity">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        >
        <android.support.v4.view.ViewPager
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="9"
            android:id="@+id/pager_show"
            ></android.support.v4.view.ViewPager>
        <android.support.design.widget.TabLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/tab"
            android:layout_weight="1"
            ></android.support.design.widget.TabLayout>
    </LinearLayout>
</android.support.constraint.ConstraintLayout>

//Fragment Adapter

package com.example.mvp03.Adapter;

import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;

import com.example.mvp03.Fragment.QRCodeFeagment;
import com.example.mvp03.Fragment.ShowDataFragment;

public class FragmentAdapter extends FragmentPagerAdapter {

    private String[] list = new String[]{"数据展示","二维码"};

    public FragmentAdapter(FragmentManager fm) {
        super(fm);
    }

    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return list[position];
    }

    @Override
    public Fragment getItem(int i) {
        switch (i){
            case 0:
               return new ShowDataFragment();
            case 1:
               return new QRCodeFeagment();
            default:return new Fragment();
        }
    }

    @Override
    public int getCount() {
        return list.length;
    }
}

//数据展示Bean 类

package com.example.mvp03.Bean;

import java.util.List;

public class ShowDataBean {

    private int code;
    private String msg;
    private List<NewslistBean> newslist;

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public List<NewslistBean> getNewslist() {
        return newslist;
    }

    public void setNewslist(List<NewslistBean> newslist) {
        this.newslist = newslist;
    }

    public static class NewslistBean {

        private String title;
        private String picUrl;
        private String url;

        public String getTitle() {
            return title;
        }

        public void setTitle(String title) {
            this.title = title;
        }

        public String getPicUrl() {
            return picUrl;
        }

        public void setPicUrl(String picUrl) {
            this.picUrl = picUrl;
        }

        public String getUrl() {
            return url;
        }

        public void setUrl(String url) {
            this.url = url;
        }
    }
}

//数据展示 Adapter

package com.example.mvp03.Adapter;

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;

import com.example.mvp03.Bean.ShowDataBean;
import com.example.mvp03.NetUtil.HttpUtil;
import com.example.mvp03.R;
import com.nostra13.universalimageloader.core.ImageLoader;

import java.util.ArrayList;
import java.util.List;

public class ShowDataAdapter extends BaseAdapter {

    private List<ShowDataBean.NewslistBean> list;
    private Context context;

    public ShowDataAdapter(Context context) {
        this.context = context;
        list = new ArrayList<>();
    }

    public void setList(List<ShowDataBean.NewslistBean> lists) {
        this.list = lists;
        notifyDataSetChanged();
    }
    public void addList(List<ShowDataBean.NewslistBean> lists){
        if (lists != null){
            lists.addAll(lists);
        }
        notifyDataSetChanged();
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public ShowDataBean.NewslistBean getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null){
            convertView = View.inflate(context, R.layout.grid_iem,null);
            holder = new ViewHolder();
            holder.pri_url = convertView.findViewById(R.id.purstr);
            convertView.setTag(holder);
        }else {
            holder = (ViewHolder) convertView.getTag();
        }
        ImageLoader.getInstance().displayImage(list.get(position).getPicUrl(),holder.pri_url);
        return convertView;
    }

    class ViewHolder{
        ImageView pri_url;
    }
}

//Fragment News

package com.example.mvp03.Fragment;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.GridView;

import com.example.mvp03.Adapter.ShowDataAdapter;
import com.example.mvp03.Bean.ShowDataBean;
import com.example.mvp03.IView.IView;
import com.example.mvp03.Presenter.IPresenterlmpl;
import com.example.mvp03.R;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshGridView;

import java.util.List;

public class ShowDataFragment extends Fragment implements IView {
    private String urlStr = "http://api.tianapi.com/meinv/?key=605fa0a929c8d8b116424df0510c6b2a&num=1";
    private IPresenterlmpl iPresenterlmpl;
    private PullToRefreshGridView gridView;
    private ShowDataAdapter adapter;
    private int pager;

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.datashow_item,container,false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        gridView = view.findViewById(R.id.pull_grid);
        iPresenterlmpl = new IPresenterlmpl(this);

        iPresenterlmpl.startRequsert2(String.format(urlStr),null);
        adapter = new ShowDataAdapter(getActivity());

        gridView.setAdapter(adapter);

        gridView.setMode(PullToRefreshBase.Mode.BOTH);
        pager = 1;
        gridView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<GridView>() {
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<GridView> refreshView) {
                pager = 1;
                iPresenterlmpl.startRequsert2(String.format(urlStr ),null);

            }

            @Override
            public void onPullUpToRefresh(PullToRefreshBase<GridView> refreshView) {

                iPresenterlmpl.startRequsert2(String.format(urlStr),null);
            }
        });
    }

    //解绑
    @Override
    public void onDestroy() {
        super.onDestroy();
        iPresenterlmpl.onDatech();
    }

    @Override
    public void showRespomnseData(Object data) {
        ShowDataBean dataBean = (ShowDataBean) data;
        List<ShowDataBean.NewslistBean> beanList = dataBean.getNewslist();
        if (pager == 1){
            adapter.setList(beanList);
        }else {
            adapter.addList(beanList);
        }
        pager ++;
        gridView.onRefreshComplete();
    }

    @Override
    public void success(String msg) {

    }

    @Override
    public void fail(String msg) {

    }
}

//imageloader

package com.example.mvp03;

import android.app.Application;
import android.graphics.Bitmap;

import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;

public class App extends Application {

    @Override
    public void onCreate() {
        super.onCreate();
        ImageLoader.getInstance().init(
                new ImageLoaderConfiguration.Builder(this)
                        .memoryCacheSizePercentage(10)
                        .diskCacheSize(50*1024*1024)
                        .defaultDisplayImageOptions(new DisplayImageOptions.Builder()
                                .cacheInMemory(true)
                                .cacheOnDisk(true)
                                .bitmapConfig(Bitmap.Config.RGB_565)
                                .showImageForEmptyUri(R.drawable.ic_launcher_background)
                                .showImageOnFail(R.drawable.ic_launcher_background)
                                .showImageOnLoading(R.drawable.ic_launcher_background)
                                .build())
                        .build()

        );
    }
}

//数据展示布局

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <com.handmark.pulltorefresh.library.PullToRefreshGridView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/pull_grid"
        android:numColumns="3"
        >

    </com.handmark.pulltorefresh.library.PullToRefreshGridView>

</android.support.constraint.ConstraintLayout>

Fragment news 布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ImageView
        android:layout_width="130dp"
        android:layout_height="150dp"
        android:id="@+id/purstr"
        android:src="@mipmap/ic_launcher"
        />
</LinearLayout>

//Fragment SQCode

package com.example.mvp03.Fragment;

import android.content.Context;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

import com.example.mvp03.R;

import java.lang.ref.WeakReference;

import cn.bingoogolapple.qrcode.zxing.QRCodeEncoder;

public class QRCodeFeagment extends Fragment {
    private Button button_go;
    private EditText editText;
    private ImageView imageView;
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.sqcode_item,container,false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        button_go = view.findViewById(R.id.go);
        editText = view.findViewById(R.id.edit_qrcode);
        imageView = view.findViewById(R.id.code_image);

        button_go.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                creatQRCode();
            }
        });
    }

    private void creatQRCode() {
        QRTask qrTask = new QRTask(getContext(),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 imageView1,EditText editText1){
            mContext = new WeakReference<>(context);
            mImageView = new WeakReference<>(imageView1);
        }

        @Override
        protected Bitmap doInBackground(String... strings) {
            String str = strings[0];
            if (TextUtils.isEmpty(str)){
                return  null;
            }
            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(),"生成失败",Toast.LENGTH_LONG).show();
            }
        }
    }
    }

//布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/edit_qrcode"
        app:layout_constraintTop_toBottomOf="@id/tuichu"
        />

    <Button
        app:layout_constraintTop_toBottomOf="@id/edit_qrcode"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/go"
        android:text="生成"/>

    <ImageView

        android:layout_width="300dp"
        android:layout_height="300dp"
        app:layout_constraintTop_toBottomOf="@id/go"
        android:layout_marginTop="20dp"
        android:id="@+id/code_image"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="退出登录"
        android:id="@+id/tuichu"/>
</android.support.constraint.ConstraintLayout>