xlistview和网络判断

最新推荐文章于 2019-02-22 10:20:42 发布

原创最新推荐文章于 2019-02-22 10:20:42 发布 · 164 阅读

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CC 4.0 BY-SA版权

本文详细介绍了一个基于安卓的应用中，如何使用自定义适配器显示列表数据，并将其添加到本地数据库的过程。文章覆盖了从网络加载图片到列表视图的显示，以及使用SQLite创建数据库表和插入数据的方法。

//适配器
package com.example.mn;

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

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

import java.util.ArrayList;

public class XListAdapder extends BaseAdapter {
private Context mContext;
private ArrayList<User.DataBean> list;

public XListAdapder(Context mContext, ArrayList<User.DataBean> list) {
    this.mContext = mContext;
    this.list = list;
}

DisplayImageOptions options = new DisplayImageOptions.Builder()
.bitmapConfig(Bitmap.Config.RGB_565)
.build();
@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 int getViewTypeCount() {
    return 2;
}

@Override
public int getItemViewType(int position) {
    int type = 0;
    if (list.get(position).getThumbnail_pic_s() != null && list.get(position).getThumbnail_pic_s02() != null && list.get(position).getThumbnail_pic_s03() != null) {
        type = 1;
    } else if (list.get(position).getThumbnail_pic_s03() == null) {
        type = 0;
    }
    return type;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    int type = getItemViewType(position);
    switch (type) {
        case 0:
            ViewHolder holder = null;
            if (convertView == null) {
                convertView = View.inflate(mContext, R.layout.item, null);
                holder = new ViewHolder();
                holder.name = convertView.findViewById(R.id.tv);
                holder.image2 = convertView.findViewById(R.id.image2);
                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }
            holder.name.setText(list.get(position).getAuthor_name());
            ImageLoader.getInstance().displayImage(list.get(position).getThumbnail_pic_s(),holder.image2,options);
            break;
        case 1:

            ViewHolder2 holder2 = null;
            if (convertView == null) {
                convertView = View.inflate(mContext, R.layout.item_one, null);
                holder2 = new ViewHolder2();
                holder2.aaa = convertView.findViewById(R.id.aaa);
                holder2.a = convertView.findViewById(R.id.a);
                holder2.b = convertView.findViewById(R.id.b);
                holder2.c = convertView.findViewById(R.id.c);
                convertView.setTag(holder2);
            } else {
                holder2 = (ViewHolder2) convertView.getTag();
            }
            holder2.aaa.setText(list.get(position).getAuthor_name());
            ImageLoader.getInstance().displayImage(list.get(position).getThumbnail_pic_s(),holder2.a,options);
            ImageLoader.getInstance().displayImage(list.get(position).getThumbnail_pic_s02(),holder2.b,options);
            ImageLoader.getInstance().displayImage(list.get(position).getThumbnail_pic_s03(),holder2.b,options);
            break;
    }
    return convertView;
}

class ViewHolder {
    TextView name;
    ImageView image2;
}

class ViewHolder2 {
    TextView aaa;
    ImageView a, b, c;
}

}
//设置数据库
package com.example.mn;

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

public class MySQL extends SQLiteOpenHelper {
public MySQL( Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
super(context, “baidu.db”, null, 1);
}

@Override
public void onCreate(SQLiteDatabase db) {
   db.execSQL("CREATE TABLE GOOD(id integer primary key AUTOINCREMENT,name varchar(20))");
}

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

}

}

//进行侧滑和网络判断,viewpager+fragemnt联动
package com.example.mn;

import android.app.Fragment;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;
import android.widget.RadioGroup;
import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

public static DrawerLayout drawerLayout;
private ViewPager viewPager;
private RadioGroup radioGroup;
private ActionBarDrawerToggle toggle;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    drawerLayout = findViewById(R.id.drawerLayout);
    viewPager = findViewById(R.id.vp);
    radioGroup = findViewById(R.id.rg);

    boolean b = initDot(MainActivity.this);
    if (b) {
        initDrawe();
        initViewpagerFragenmt();
    } else {
        Toast.makeText(MainActivity.this, "请检查网络是否连接", Toast.LENGTH_SHORT).show();
    }
}

private void initViewpagerFragenmt() {
    ArrayList<Fragment> list = new ArrayList<>();
    list.add(new viewpager_one_Fragment());
    list.add(new viewpager_two_Fragment());
      list.add(new viewpager_three_Fragment());
    MyFragemnt myFragemnt =  new MyFragemnt(getFragmentManager());
    myFragemnt.MyA(list);
    viewPager.setAdapter(myFragemnt);

    viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
        @Override
        public void onPageScrolled(int i, float v, int i1) {

        }

        @Override
        public void onPageSelected(int i) {
            switch (i){
                case 0:
                    radioGroup.check(1);
                    break;
                case 1:
                    radioGroup.check(2);
                    break;
                case 2:
                    radioGroup.check(3);
                    break;


            }
        }

        @Override
        public void onPageScrollStateChanged(int i) {

        }
    });

    radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            switch (checkedId){
                case 1:
                    viewPager.setCurrentItem(0);
                    break;
                case 2:
                    viewPager.setCurrentItem(1);
                    break;
                case 3:
                    viewPager.setCurrentItem(2);
                    break;

            }
        }
    });






}
//判断是否有网
private boolean initDot(Context context) {
    ConnectivityManager manager = (ConnectivityManager) context.getSystemService(CONNECTIVITY_SERVICE);
    NetworkInfo info = manager.getActiveNetworkInfo();
    if (info != null && info.getType() == manager.TYPE_WIFI) {
        return true;
    }
    return false;
}

private void initDrawe() {
    ActionBar actionBar = getSupportActionBar();
    actionBar.setDisplayHomeAsUpEnabled(true);
    toggle = new ActionBarDrawerToggle(this, drawerLayout, R.string.open, R.string.colse);
    toggle.syncState();
    drawerLayout.addDrawerListener(toggle);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (toggle.onOptionsItemSelected(item)) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

}

//xlistview列表展示并添加到数据库
package com.example.mn;

import android.app.Fragment;
import android.content.ContentValues;
import android.os.Bundle;

import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.bawei.xlistviewlibrary.XListView;
import com.google.gson.Gson;

import java.util.ArrayList;

/**

A simple {@link Fragment} subclass.
*/
public class viewpager_one_Fragment extends Fragment {

private XListView xListView;
private String poath=“http://www.xieast.com/api/news/news.php?page=1”;
private ArrayList<User.DataBean> list = new ArrayList<>();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = View.inflate(getActivity(),R.layout.fragment_viewpager_one_,null);
xListView = view.findViewById(R.id.xlv);
initXlistview();
Mysqlite mysqlite = new Mysqlite(getActivity());
for(int a=0;a<list.size();a++){
ContentValues values = new ContentValues();
values.put(“name”,list.get(a).getAuthor_name());
mysqlite.insert(“GOOD”,null,values);
}
return view;
}

private void initXlistview() {
helpListener helpListener = new helpListener(new helpListener.GetData() {
@Override
public void Data(String str) {
Gson gson = new Gson();
User user = gson.fromJson(str,User.class);
list.addAll(user.getData());
xListView.setAdapter(new XListAdapder(getActivity(),list));
```
     }
 });
 helpListener.execute(poath);
```
}

}