Android - Fragment

MeituanListAdapter.java

package com.zy.project.android.adapter;

import java.util.List;

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

public class MeituanListAdapter extends BaseAdapter{

    Context context;
    List<String> list;
    int selectedPosition = -1;
    public  MeituanListAdapter(Context context,List<String> list) {
        // TODO Auto-generated constructor stub
    this.context= context;
    this.list = list;
    }
    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return list==null?0:list.size();
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return 0;
    }

    public void setSelectedPosition(int selected){
        selectedPosition = selected;
        notifyDataSetChanged();
    }
    public void refresh(List<String> list){
        this.list = list;
        notifyDataSetChanged();
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub
        TextView tv = new TextView(context);
        tv.setText(list.get(position));
        tv.setTextSize(20);
        tv.setPadding(40, 40, 40, 40);
        if(selectedPosition == position){
            tv.setBackgroundColor(Color.RED);
        }else{
            tv.setBackgroundColor(Color.WHITE);
        }
        return tv;
    }

}

 

MeiTuanFragment.java

package com.zy.project.android.fragment;

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

import com.zy.project.android.R;
import com.zy.project.android.adapter.MeituanListAdapter;

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;

public class MeiTuanFragment extends ListFragment {

    MeituanListAdapter adapter;
    Context context;
    List<String> list;
    int level = 1;
    int type = R.array.all_types;
    OnListItemClickCallBack callBack;

    public void setLevel(int level) {
        this.level = level;
    }

    public void setArrayType(int arrayRes) {
        this.type = arrayRes;
        if (adapter != null) {
            adapter.setSelectedPosition(-1);
            addList();
            adapter.refresh(list);
        }
    }

    public void setOnListItemClickCallBack(OnListItemClickCallBack back) {
        callBack = back;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        context = getActivity();
    }

    private void addList() {
        if(type == -1){
            list = new ArrayList<String>();
        }else{
        String[] arr = getResources().getStringArray(type);
        list = Arrays.asList(arr);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        addList();
        adapter = new MeituanListAdapter(context, list);
        setListAdapter(adapter);

        return super.onCreateView(inflater, container, savedInstanceState);
    }

    // item 点击事件
    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        // TODO Auto-generated method stub
        super.onListItemClick(l, v, position, id);
        String title = (String) l.getItemAtPosition(position);
        int arrRes = 0;
        switch (position) {
        case 0:
            arrRes = R.array.city_array;
            break;
        case 1:
            arrRes = R.array.type_food;
            break;
        default:
            arrRes = R.array.type_hotel;
            break;
        }
        adapter.setSelectedPosition(position);
        if (callBack != null) {
            callBack.itemClick(level, title, arrRes);
        }
    }

    public static interface OnListItemClickCallBack {
        /**
         * 
         * @param level
         *            当前Fragment的等级
         * @param title
         *            当前Fragment显示的信息
         * @param arrRes
         *            下一级 Fragment需要显示的 数据
         */
        public void itemClick(int level, String title, int arrRes);
    }
}

 

FragmentActivity.java

package com.zy.project.android.activity;

import com.zy.project.android.R;
import com.zy.project.android.fragment.MeiTuanFragment;
import com.zy.project.android.fragment.MeiTuanFragment.OnListItemClickCallBack;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;

public class BusinessActivity extends FragmentActivity implements OnListItemClickCallBack{

    TextView tvResult;//显示用户选择的结果
    LinearLayout layout;//需要显示隐藏的容器
    FragmentManager manager;
    FragmentTransaction tran;
    MeiTuanFragment fragmentLevel1;
    MeiTuanFragment fragmentLevel2;
    
    @Override
    protected void onCreate(Bundle arg0) {
        // TODO Auto-generated method stub
        super.onCreate(arg0);
        setContentView(R.layout.business_layout);
        tvResult = (TextView) findViewById(R.id.tvResult);
        layout = (LinearLayout) findViewById(R.id.layout);
        manager = getSupportFragmentManager();
    }
    //显示Fragment
    public void show(View view){
        layout.setVisibility(View.VISIBLE);
        if(fragmentLevel1==null){
        fragmentLevel1 = new MeiTuanFragment();
        addFragment(fragmentLevel1, R.id.ly1, 1);
        
        }
        //清空二级菜单
        if(fragmentLevel2!=null){
            fragmentLevel1.setArrayType(R.array.all_types);
            fragmentLevel2.setArrayType(-1);
        }
    }
    private void addFragment(MeiTuanFragment fragment,int id,int level){
        fragment.setLevel(level);
        fragment.setOnListItemClickCallBack(this);
        tran = manager.beginTransaction();
        tran.add(id, fragment);
        tran.commit();
    }
    String resuslt;
    @Override
    public void itemClick(int level, String title, int arrRes) {
        // TODO Auto-generated method stub
        if(level== 1){
            if(fragmentLevel2 ==null){
            fragmentLevel2 = new MeiTuanFragment();
            addFragment(fragmentLevel2, R.id.ly2, 2);
            }
            fragmentLevel2.setArrayType(arrRes);
            resuslt = title;
        }else if(level ==2){
            layout.setVisibility(View.GONE);
            resuslt +=title;
            tvResult.setText(resuslt);
        }
    }
}