资讯_PullToRefreshListView,Http，圆角，本地缓存，数据库，基类，图片缓存

依赖

implementation 'com.google.code.gson:gson:2.8.5'
implementation 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'

权限

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.demo100">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application
        android:name=".app.App"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

MainActivity基类

package com.example.demo100;

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

/**
 * @Auther: 努力
 * @Date: 2019/1/17 15:28:${卢文杰}
 * @Description:
 */
public abstract class BaseActivity extends AppCompatActivity {

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(bindlayout());
        initView();
        initData();
        bindEvent();
    }

    protected abstract int bindlayout();

    protected abstract void initView();

    protected abstract void initData();

    protected abstract void bindEvent();

    protected <T extends View> T bindView(int resId) {
        return (T) findViewById(resId);
    }

}

Http工具类

package com.example.demo100.http;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;

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

/**
 * @Auther: 努力
 * @Date: 2019/1/17 15:41:${卢文杰}
 * @Description:
 */
public class Http {

    public static boolean isNetworkHttp(Context context) {

        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo info = connectivityManager.getActiveNetworkInfo();

        if (info != null) {
            return info.isAvailable();
        }

        return false;
    }

    public static void HttpAsyncTask(String strUrl, final CallBackS callBackS) {
        new AsyncTask<String, Integer, String>() {
            @Override
            protected String doInBackground(String... strings) {
                return requestHttp(strings[0]);
            }

            @Override
            protected void onPostExecute(String s) {
                super.onPostExecute(s);
                callBackS.getData(s);
            }
        }.execute(strUrl);
    }

    public interface CallBackS {
        void getData(String s);
    }

    public static String requestHttp(String strUrl) {

        try {

            URL url = new URL(strUrl);

            HttpURLConnection connection = (HttpURLConnection) url.openConnection();

            connection.setRequestMethod("GET");

            connection.setConnectTimeout(5000);

            connection.setReadTimeout(5000);

            int code = connection.getResponseCode();

            if (code == HttpURLConnection.HTTP_OK) {

                InputStream stream = connection.getInputStream();

                BufferedReader reader = new BufferedReader(new InputStreamReader(stream, "utf-8"));

                StringBuilder builder = new StringBuilder();

                String str = "";

                while ((str = reader.readLine()) != null) {

                    builder.append(str);

                }

                return builder.toString();
            }

            connection.disconnect();

        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }

}

MainActivity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"
    tools:context=".MainActivity">



    <android.support.v4.widget.DrawerLayout
        android:id="@+id/drawer"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

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

            <com.handmark.pulltorefresh.library.PullToRefreshListView
                android:id="@+id/pull"
                android:layout_width="match_parent"
                android:layout_height="match_parent"></com.handmark.pulltorefresh.library.PullToRefreshListView>

        </LinearLayout>

        <LinearLayout
            android:layout_width="350dp"
            android:layout_height="match_parent"
            android:layout_gravity="left"
            android:background="#fff"
            android:orientation="vertical">

            <ImageView
                android:id="@+id/image_cl"
                android:layout_width="150dp"
                android:layout_height="150dp"
                android:layout_marginLeft="95dp"
                android:src="@mipmap/ic_launcher" />

            <ListView
                android:id="@+id/listview_cl"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_marginTop="20dp" />
        </LinearLayout>
    </android.support.v4.widget.DrawerLayout>


</LinearLayout>

MainActivity

package com.example.demo100;

import android.content.ContentValues;
import android.database.Cursor;
import android.support.annotation.NonNull;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Toast;

import com.example.demo100.adapter.MyAdapter;
import com.example.demo100.app.App;
import com.example.demo100.bean.JsonBean;
import com.example.demo100.http.Http;
import com.example.demo100.sqlite.Dao;
import com.google.gson.Gson;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshListView;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;

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

public class MainActivity extends BaseActivity {


    private PullToRefreshListView pull;
    private String str = "接口";
    private List<JsonBean.DataBean> data;
    private Dao dao;
    private Cursor person;
    private MyAdapter myAdapter;
    private DrawerLayout drawerLayout;
    private ImageView imageView;
    private ListView listView;
    private String sa = "http://f.expoon.com/sub/news/2016/01/21/887844_230x162_0.jpg";

    @Override
    protected int bindlayout() {
        return R.layout.activity_main;
    }

    @Override
    protected void initView() {
        pull = bindView(R.id.pull);
        drawerLayout = bindView(R.id.drawer);
        imageView = bindView(R.id.image_cl);
        listView = bindView(R.id.listview_cl);
        dao = new Dao(MainActivity.this);
    }

    @Override
    protected void initData() {

        pull.setMode(PullToRefreshListView.Mode.BOTH);
        pull.setScrollingWhileRefreshingEnabled(true);

        drawerLayout.openDrawer(Gravity.LEFT);
        drawerLayout.closeDrawer(Gravity.LEFT);

        DisplayImageOptions options =  App.getDisplayImageOptions2();
        ImageLoader.getInstance().displayImage(sa,imageView,options);

        if (Http.isNetworkHttp(MainActivity.this)) {
            Http.HttpAsyncTask(str, new Http.CallBackS() {
                @Override
                public void getData(String s) {
                    Gson gson = new Gson();
                    JsonBean jsonBean = gson.fromJson(s, JsonBean.class);
                    List<JsonBean.DataBean> arraylist = jsonBean.getData();
                    listView.setAdapter(new MyAdapter(MainActivity.this, arraylist));
                }
            });
        } else {
            Toast.makeText(MainActivity.this, "没网了", Toast.LENGTH_LONG).show();
        }


        if (Http.isNetworkHttp(MainActivity.this)) {
            Http.HttpAsyncTask(str, new Http.CallBackS() {
                @Override
                public void getData(String s) {
                    gsonJx(s);
                }
            });
        } else {
            person = dao.query("person", null, null, null, null, null, null);
            data = new ArrayList<>();
            if (person.moveToFirst()) {
                do {
                    String news_title = person.getString(person.getColumnIndex("news_title"));
                    String news_summary = person.getString(person.getColumnIndex("news_summary"));
                    String pic_url = person.getString(person.getColumnIndex("pic_url"));
                    data.add(new JsonBean.DataBean(news_title, news_summary, pic_url));
                } while (person.moveToNext());
            }
            person.close();
            Toast.makeText(MainActivity.this, "没网了", Toast.LENGTH_LONG).show();
            myAdapter = new MyAdapter(MainActivity.this, data);
            pull.setAdapter(myAdapter);
        }
    }

    private void gsonJx(String s) {
        Gson gson = new Gson();
        JsonBean jsonBean = gson.fromJson(s, JsonBean.class);
        data = jsonBean.getData();
        person = dao.query("person", null, null, null, null, null, null);
        if (person.moveToFirst()) {

        } else {

            for (JsonBean.DataBean bean : data) {
                ContentValues values = new ContentValues();
                values.put("news_title", bean.getNews_title());
                values.put("news_summary", bean.getNews_summary());
                values.put("pic_url", bean.getPic_url());
                dao.add("person", null, values);
            }
        }
        myAdapter = new MyAdapter(MainActivity.this, data);
        pull.setAdapter(myAdapter);

    }

    @Override
    protected void bindEvent() {
        pull.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
                if (Http.isNetworkHttp(MainActivity.this)) {
                    Http.HttpAsyncTask(str, new Http.CallBackS() {
                        @Override
                        public void getData(String s) {
                            gsonJx(s);
                        }
                    });
                } else {
                    Toast.makeText(MainActivity.this, "没网了", Toast.LENGTH_LONG).show();
                }
                pull.onRefreshComplete();
            }

            @Override
            public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
                if (Http.isNetworkHttp(MainActivity.this)) {
                    Http.HttpAsyncTask(str, new Http.CallBackS() {
                        @Override
                        public void getData(String s) {
                            Gson gson = new Gson();
                            JsonBean jsonBean = gson.fromJson(s, JsonBean.class);
                            List<JsonBean.DataBean> list = jsonBean.getData();
                            data.addAll(list);
                            myAdapter.notifyDataSetChanged();
                        }
                    });
                } else {
                    Toast.makeText(MainActivity.this, "没网了", Toast.LENGTH_LONG).show();
                }
                pull.onRefreshComplete();
            }
        });

        drawerLayout.addDrawerListener(new DrawerLayout.DrawerListener() {
            @Override
            public void onDrawerSlide(@NonNull View view, float v) {

            }

            @Override
            public void onDrawerOpened(@NonNull View view) {

            }

            @Override
            public void onDrawerClosed(@NonNull View view) {

            }

            @Override
            public void onDrawerStateChanged(int i) {

            }
        });

    }
}

item_01布局

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

    <ImageView
        android:id="@+id/m0"
        android:layout_width="150dp"
        android:layout_height="150dp"
        android:src="@mipmap/ic_launcher" />

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

        <TextView
            android:id="@+id/t0"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="hh"
            android:textSize="16sp" />

        <TextView
            android:id="@+id/t1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="hh"
            android:textSize="14sp" />
    </LinearLayout>

</LinearLayout>

Myadapter页面

package com.example.demo100.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.demo100.R;
import com.example.demo100.app.App;
import com.example.demo100.bean.JsonBean;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;

import java.util.List;

/**
 * @Auther: 努力
 * @Date: 2019/1/17 19:36:${卢文杰}
 * @Description:
 */
public class MyAdapter extends BaseAdapter {

    private Context context;
    private List<JsonBean.DataBean> list;

    public MyAdapter(Context context, List<JsonBean.DataBean> list) {
        this.context = context;
        this.list = list;
    }

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

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null){
            convertView = LayoutInflater.from(context).inflate(R.layout.item_01,null);
            holder = new ViewHolder();
            holder.t0 = convertView.findViewById(R.id.t0);
            holder.t1 = convertView.findViewById(R.id.t1);
            holder.m0 = convertView.findViewById(R.id.m0);
            convertView.setTag(holder);
        }else{
            holder = (ViewHolder) convertView.getTag();
        }
        JsonBean.DataBean dataBean = list.get(position);
        holder.t0.setText(dataBean.getNews_title());
        holder.t1.setText(dataBean.getNews_summary());
        DisplayImageOptions options = new App().getDisplayImageOptions();
        ImageLoader.getInstance().displayImage(dataBean.getPic_url(),holder.m0,options);
        return convertView;
    }
    static class ViewHolder{
        TextView t0,t1;
        ImageView m0;
    }
}

SQLite页面

package com.example.demo100.sqlite;

        import android.content.Context;
        import android.database.sqlite.SQLiteDatabase;
        import android.database.sqlite.SQLiteOpenHelper;

/**
 * @Auther: 努力
 * @Date: 2019/1/17 15:57:${卢文杰}
 * @Description:
 */
public class Mysqlite extends SQLiteOpenHelper {
    public Mysqlite(Context context) {
        super(context, "news.db", null, 1);
    }
    
    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table person(id INTEGER PRIMARY KEY AUTOINCREMENT,news_title text,news_summary text,pic_url text)");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}

Dao

package com.example.demo100.sqlite;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

/**
 * @Auther: 努力
 * @Date: 2019/1/17 16:00:${卢文杰}
 * @Description:
 */
public class Dao {

    private final SQLiteDatabase db;

    public Dao(Context context) {
        Mysqlite mysqlite = new Mysqlite(context);
        db = mysqlite.getWritableDatabase();
    }

    public long add(String table, String nullColumnHack, ContentValues values) {
        return db.insert(table, nullColumnHack, values);
    }

    public long delete(String table, String whereClause, String[] whereArgs){
        return db.delete(table,whereClause,whereArgs);
    }

    public long update(String table, ContentValues values, String whereClause, String[] whereArgs){
        return db.update(table,values,whereClause,whereArgs);
    }

    public Cursor query(String table, String[] columns, String selection,
                        String[] selectionArgs, String groupBy, String having,
                        String orderBy) {
        return db.query(table, columns, selection, selectionArgs, groupBy, having, orderBy);
    }

}

App页面

package com.example.demo100.app;

import android.app.Application;
import android.os.Environment;

import com.example.demo100.R;
import com.nostra13.universalimageloader.cache.disc.impl.UnlimitedDiskCache;
import com.nostra13.universalimageloader.cache.disc.naming.Md5FileNameGenerator;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.display.RoundedBitmapDisplayer;

import java.io.File;

/**
 * @Auther: 努力
 * @Date: 2019/1/17 20:32:${卢文杰}
 * @Description:
 */
public class App extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        String path = Environment.getExternalStorageDirectory().getPath() + "/RiKao13";
        File file = new File(path);

        ImageLoaderConfiguration loader = new ImageLoaderConfiguration.Builder(this)
                .memoryCacheExtraOptions(200, 200)//配置内存缓存图片的尺寸
                .memoryCacheSize(2 * 1024 * 1024)//配置内存缓存的大小
                .threadPoolSize(3)//配置加载图片的线程数
                .threadPriority(1000)//配置线程的优先级
                .diskCache(new UnlimitedDiskCache(file))//UnlimitedDiskCache 限制这个图片的缓存路径
                .diskCacheFileCount(50)//配置sdcard缓存文件的数量
                .diskCacheFileNameGenerator(new Md5FileNameGenerator())//MD5这种方式生成缓存文件的名字
                .diskCacheSize(50 * 1024 * 1024)//在sdcard缓存50MB
                .build();

        //获得实例
        ImageLoader imageLoader = ImageLoader.getInstance();

        ImageLoader.getInstance().init(loader);

    }

    public static DisplayImageOptions getDisplayImageOptions() {
        DisplayImageOptions displayImageOptions = new DisplayImageOptions.Builder()
                .showImageOnLoading(R.mipmap.zhan)
                .showImageForEmptyUri(R.mipmap.zhaobudao)
                .showImageOnFail(R.mipmap.shibai)
                .build();
        return displayImageOptions;
    }

    public static DisplayImageOptions getDisplayImageOptions2() {
        DisplayImageOptions displayImageOptions = new DisplayImageOptions.Builder()
                .showImageOnLoading(R.mipmap.zhan)
                .showImageForEmptyUri(R.mipmap.zhaobudao)
                .showImageOnFail(R.mipmap.shibai)
                .displayer(new RoundedBitmapDisplayer(360))
                .build();
        return displayImageOptions;
    }

}

效果图