TabletLayout 数据库

Main_activity

<?xml version="1.0" encoding="utf-8"?>

<FrameLayout
    android:id="@+id/fragment_frage"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_weight="1">


</FrameLayout>

<RadioGroup
    android:id="@+id/radioGroup"

    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <RadioButton
        android:id="@+id/shou"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:button="@null"
        android:gravity="center"
        android:text="首页" />

    <RadioButton
        android:id="@+id/video"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:button="@null"
        android:gravity="center"
        android:text="视频" />

    <RadioButton
        android:id="@+id/my"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:button="@null"
        android:gravity="center"
        android:text="我的" />
</RadioGroup>

***TableLayout*** <?xml version="1.0" encoding="utf-8"?>

<android.support.design.widget.TabLayout
    android:id="@+id/tableLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"></android.support.design.widget.TabLayout>

<android.support.v4.view.ViewPager
    android:id="@+id/viewPager_frag01"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_weight="1"></android.support.v4.view.ViewPager>

***PullToRefresh*** <?xml version="1.0" encoding="utf-8"?>

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

***listView*** <?xml version="1.0" encoding="utf-8"?>

<LinearLayout
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:orientation="horizontal">

    <ImageView
        android:id="@+id/imageView01_tabfrag01_list"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:src="@drawable/ic_launcher_background" />
</LinearLayout>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textView01_tabfrag01_list"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="TextView" />

    <TextView
        android:id="@+id/textView02_tabfrag01_list"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="TextView" />
</LinearLayout>

***主页面Main*** package com.example.zhou3;

import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.RadioGroup;

public class MainActivity extends AppCompatActivity {

private RadioGroup radioGroup;
private Frag_01 frag_01;
private Frag_02 frag_02;
private Frag_03 frag_03;
private FragmentManager manager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //找控件
    radioGroup = findViewById(R.id.radioGroup);
    //获取fragment
    frag_01 = new Frag_01();
    frag_02 = new Frag_02();
    frag_03 = new Frag_03();
    //获取管理器
    manager = getSupportFragmentManager();
    FragmentTransaction transaction = manager.beginTransaction();

    transaction.add(R.id.fragment_frage, frag_01);
    transaction.add(R.id.fragment_frage, frag_02);
    transaction.add(R.id.fragment_frage, frag_03);
    transaction.show(frag_01).hide(frag_02).hide(frag_03);
    transaction.commit();

    //radioGroup监听
    radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            FragmentTransaction fragmentTransaction = manager.beginTransaction();
            switch (checkedId) {
                case R.id.shou:
                    fragmentTransaction.show(frag_01).hide(frag_02).hide(frag_03);
                    break;

                case R.id.video:
                    fragmentTransaction.show(frag_02).hide(frag_01).hide(frag_03);
                    break;
                case R.id.my:
                    fragmentTransaction.show(frag_03).hide(frag_02).hide(frag_01);
                    break;

            }
            fragmentTransaction.commit();
        }
    });

}

}

TableLayut页面
package com.example.zhou3;

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.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.example.xlibrary.utils.NetWordUtils;
import com.example.zhou3.bean.Goods;
import com.example.zhou3.dao.JsonDao;
import com.example.zhou3.lian.NetUtil;
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 com.nostra13.universalimageloader.core.imageaware.ImageAware;

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

public class Frag01_item extends Fragment {

private PullToRefreshListView plv;
private JsonDao dao;
private MyPullAdapter pullAdapter;
ArrayList<Goods.DataBean> list = new ArrayList<>();

String jsonUrl = "http://api.expoon.com/AppNews/getNewsList/type/1/p/";
private int page = 0;

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.frag_item01, container, false);
    //找控件
    plv = view.findViewById(R.id.plv);
    plv.setMode(PullToRefreshBase.Mode.BOTH);

    //创建dao层
    dao = new JsonDao(getActivity());
    //创建适配器
    pullAdapter = new MyPullAdapter();
    plv.setAdapter(pullAdapter);

    initData(page);
    //上下拉刷新
    plv.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
        @Override
        public void onPullDownToRefresh(PullToRefreshBase<ListView> pullToRefreshBase) {
            list.clear();
            initData(0);
        }

        @Override
        public void onPullUpToRefresh(PullToRefreshBase<ListView> pullToRefreshBase) {
            page++;
            initData(page);
        }
    });

    return view;
}

private void initData(int page) {
    String murl = jsonUrl + page;
    if (NetUtil.isconn(getActivity())) {
        //创建MyAsnc
        new MyAsyTask().execute(murl);
    } else {
        //无网情况
        Toast.makeText(getActivity(), "当前没有网络", Toast.LENGTH_SHORT).show();

        //数据哭进项查询
        String select = dao.selete(murl);
        if (!select.isEmpty()) {
            //json
            Gson gson = new Gson();
            Goods fromJson = gson.fromJson(select, Goods.class);
            List<Goods.DataBean> data = fromJson.getData();
            list.addAll(data);
            pullAdapter.notifyDataSetChanged();//刷新
            plv.onRefreshComplete();

        }

    }

}

public class MyAsyTask extends AsyncTask<String, Void, String> {
    String name = "";

    @Override
    protected String doInBackground(String... strings) {
        name = strings[0];
        return NetWordUtils.getNetjson(strings[0]);
    }

    @Override
    protected void onPostExecute(String s) {
        super.onPostExecute(s);
        //代用dao层
        dao.inserts(s, name);
        //json
        Gson gson = new Gson();
        Goods fromJson = gson.fromJson(s, Goods.class);
        List<Goods.DataBean> data = fromJson.getData();
        list.addAll(data);
        pullAdapter.notifyDataSetChanged();//刷新
        plv.onRefreshComplete();//

    }
}

public class MyPullAdapter extends BaseAdapter {


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

    @Override
    public Object 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 = null;
        if (convertView == null) {
            holder = new ViewHolder();
            convertView = View.inflate(getActivity(), R.layout.frag02_itemlist, null);
            holder.textView1 = convertView.findViewById(R.id.textView01_tabfrag01_list);
            holder.getTextView2 = convertView.findViewById(R.id.textView02_tabfrag01_list);
            holder.imageView = convertView.findViewById(R.id.imageView01_tabfrag01_list);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.textView1.setText(list.get(position).getNews_title());
        holder.getTextView2.setText(list.get(position).getNews_summary());
        ImageLoader.getInstance().displayImage(list.get(position).getPic_url(), holder.imageView);

        return convertView;
    }

    class ViewHolder {

        TextView textView1, getTextView2;
        ImageView imageView;

    }
}

}
package com.example.zhou3;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;

import com.handmark.pulltorefresh.library.PullToRefreshListView;

import java.util.ArrayList;

public class Frag_01 extends Fragment {
private ArrayList titles = new ArrayList();
private PullToRefreshListView plv;
private Frag01_item frag01_item;
private Frag02_item frag02_item;
private Frag03_item frag03_item;
private ArrayList arrayList;

private TabLayout tableLayout;
private ViewPager viewPager;
private MyAdapter adapter;

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.frag_01, container, false);
    //获取控件
    tableLayout = view.findViewById(R.id.tableLayout);
    viewPager = view.findViewById(R.id.viewPager_frag01);

    //创建头部数据
    for (int i = 0; i < 3; i++) {
        titles.add("首页" + i);
    }
    //获取fragment
    frag01_item = new Frag01_item();
    frag02_item = new Frag02_item();
    frag03_item = new Frag03_item();
    arrayList = new ArrayList<>();
    arrayList.add(frag01_item);
    arrayList.add(frag02_item);
    arrayList.add(frag03_item);
    //viewPager适配器
    adapter = new MyAdapter(getActivity().getSupportFragmentManager());
    viewPager.setAdapter(adapter);
    //设置tabLayout显示模式
    tableLayout.setTabMode(TabLayout.MODE_FIXED);
    //让tabLayout和viewPager关联
    tableLayout.setupWithViewPager(viewPager);
    return view;

}

public class MyAdapter extends FragmentPagerAdapter {


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

    @Override
    public Fragment getItem(int i) {
        return arrayList.get(i);
    }

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

    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return titles.get(position);
    }
}

}

JsonDao

package com.example.zhou3.dao;

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

public class JsonDao {

private final MSQLiteopen msqLiteopen;

public JsonDao(Context context) {
    msqLiteopen = new MSQLiteopen(context);

}

public void inserts(String s, String name) {
    //先删除在插入
    SQLiteDatabase db = msqLiteopen.getWritableDatabase();
    //先删除,再插入
    db.delete("t_pulls", "urls=?", new String[]{name});
    //插入时必用对象
    ContentValues values = new ContentValues();
    values.put("jsons", s);
    values.put("urls", name);
    //插入
    db.insert("t_pulls", null, values);
}

public String selete(String jsonUrl) {
    String querys = "";
    SQLiteDatabase db = msqLiteopen.getWritableDatabase();
    Cursor cursor = db.query("t_pulls", null, "urls=?", new String[]{jsonUrl}, null, null, null);
    while (cursor.moveToNext()) {
        querys = cursor.getString(cursor.getColumnIndex("jsons"));
    }

    return querys;
}

}
创建数据库表
package com.example.zhou3.dao;

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

class MSQLiteopen extends SQLiteOpenHelper {

public MSQLiteopen(Context context) {
    super(context, "pull.db", null, 1);
}

@Override
public void onCreate(SQLiteDatabase db) {
    db.execSQL("create table t_pulls(ids integer primary key autoincrement,jsons text,urls text)");

}

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

}

}
图片
package com.example.zhou3;

import android.app.Application;

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

public class MyAppliction extends Application {

@Override
public void onCreate() {
    super.onCreate();

    ImageLoaderConfiguration loaderConfiguration = new ImageLoaderConfiguration.Builder(this)
            .build();

    //初始化
    ImageLoader.getInstance().init(loaderConfiguration);

}

}

标签：frag,数据库,TabletLayout,new,import,android,com,public
来源： https://blog.csdn.net/qq_42805722/article/details/84172992