【Android】仿今日頭條簡單的刷新效果

點擊按鈕，先自動進行下拉刷新，也可以手動刷新，刷新完後，最後就多一行數據。有四個選項卡。

前兩天導師要求做一個給本科學生預定機房座位的app，出發點來自這裡。做著做著遇到很多問題，都解決了。這個效果感覺還不錯，整理一下。

MainActivity

package com.example.fragmentmytest;

import android.content.DialogInterface;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.text.TextUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

import com.example.dialog.CustomDialog;
import com.example.dialog.CustomDialogChangePwd;
import com.example.dialog.CustomDialogSignUp;
import com.example.myapplication.CustomApplication;
import com.example.utils.ToastUtils;

public class MainActivity extends FragmentActivity {

    public static final String serverAddress = "http://192.168.1.101";
    public static final String serverPort = "8080";

    OneFragment onefragment;
    TwoFragment twofragment;
    ThreeFragment threefragment;
    FourFragment fourfragment;
    Button btn1, btn2, btn3, btn4;
    OnClickListener clicklistener;
    TextView stu_msg;
    private CustomApplication app;

    /**
     * 用於對Fragment進行管理
     */
    FragmentManager fragementManager;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        app = (CustomApplication) getApplication(); // 獲得CustomApplication對象
        // 必須繼承FragmentActivity才能用getSupportFragmentManager()；最好使用v4.app，已經沒怎麼有人使用app中的了
        fragementManager = getSupportFragmentManager();

        init();
        // 第一次啟動時選中第0個tab
        setTabSelection(0);// 不能左右滑動的默認值

    }

    public void init() {
        stu_msg = (TextView) findViewById(R.id.stu_msg);

        btn1 = (Button) findViewById(R.id.btn1);
        btn2 = (Button) findViewById(R.id.btn2);
        btn3 = (Button) findViewById(R.id.btn3);
        btn4 = (Button) findViewById(R.id.btn4);

        clicklistener = new OnClickListener() {
            public void onClick(View arg0) {
                int id = arg0.getId();
                switch (id) {
                case R.id.btn1:
                    setTabSelection(0);
                    break;
                case R.id.btn2:
                    setTabSelection(1);
                    break;
                case R.id.btn3:
                    setTabSelection(2);
                    break;
                case R.id.btn4:
                    setTabSelection(3);
                    break;
                default:
                    break;
                }
            }
        };
        btn1.setOnClickListener(clicklistener);
        btn2.setOnClickListener(clicklistener);
        btn3.setOnClickListener(clicklistener);
        btn4.setOnClickListener(clicklistener);
    }

    private void setTabSelection(int index) {
        clearSelection();// 每次選中之前先清楚掉上次的選中狀態

        // 開啟一個Fragment事務
        FragmentTransaction transaction = fragementManager.beginTransaction();
        // 先隱藏掉所有的Fragment，以防止有多個Fragment顯示在界面上的情況
        hideFragements(transaction);

        switch (index) {
        case 0:
            btn1.setBackgroundColor(Color.parseColor("#CFEFEF"));
            btn1.setTextColor(Color.parseColor("#FFFFFF"));
            app.setRoom(btn1.getText().toString());
            if (onefragment == null) {
                onefragment = new OneFragment();
                transaction.add(R.id.framelayout, onefragment);
            } else {
                transaction.show(onefragment);
                onefragment.mPullRefreshListView.setRefreshing(true);
            }

            break;
        case 1:
            btn2.setBackgroundColor(Color.parseColor("#CFEFEF"));
            btn2.setTextColor(Color.parseColor("#FFFFFF"));
            app.setRoom(btn2.getText().toString());
            if (twofragment == null) {
                twofragment = new TwoFragment();
                transaction.add(R.id.framelayout, twofragment);
            } else {
                transaction.show(twofragment);
                twofragment.mPullRefreshListView.setRefreshing(true);
            }
            break;
        case 2:
            btn3.setBackgroundColor(Color.parseColor("#CFEFEF"));
            btn3.setTextColor(Color.parseColor("#FFFFFF"));
            app.setRoom(btn3.getText().toString());
            if (threefragment == null) {
                threefragment = new ThreeFragment();
                transaction.add(R.id.framelayout, threefragment);
            } else {
                transaction.show(threefragment);
                threefragment.mPullRefreshListView.setRefreshing(true);
            }
            break;
        case 3:
            btn4.setBackgroundColor(Color.parseColor("#CFEFEF"));
            btn4.setTextColor(Color.parseColor("#FFFFFF"));
            app.setRoom(btn4.getText().toString());
            if (fourfragment == null) {
                fourfragment = new FourFragment();
                transaction.add(R.id.framelayout, fourfragment);
            } else {
                transaction.show(fourfragment);
                fourfragment.mPullRefreshListView.setRefreshing(true);
            }
            break;

        default:
            break;

        }
        transaction.commit();
    }

    /**
     * 清除掉所有的選中狀態。
     */
    private void clearSelection() {
        btn1.setBackgroundColor(Color.parseColor("#EFEFEF"));
        btn1.setTextColor(Color.parseColor("#234567"));
        btn2.setBackgroundColor(Color.parseColor("#EFEFEF"));
        btn2.setTextColor(Color.parseColor("#234567"));
        btn3.setBackgroundColor(Color.parseColor("#EFEFEF"));
        btn3.setTextColor(Color.parseColor("#234567"));
        btn4.setBackgroundColor(Color.parseColor("#EFEFEF"));
        btn4.setTextColor(Color.parseColor("#234567"));
    }

    /**
     * 將所有的Fragment都置為隱藏狀態。
     * 
     * @param transaction
     *            用於對Fragment執行操作的事務
     */
    private void hideFragements(FragmentTransaction transaction) {
        if (onefragment != null) {
            transaction.hide(onefragment);
        }
        if (twofragment != null) {
            transaction.hide(twofragment);
        }
        if (threefragment != null) {
            transaction.hide(threefragment);
        }
        if (fourfragment != null) {
            transaction.hide(fourfragment);
        }
    }
}

四個Fragment都差不多，這裡是第一個：

package com.example.fragmentmytest;

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

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

import com.example.adapter.MyAdapter;
import com.example.dao.ComputerRoomStatus;
import com.example.utils.ToastUtils;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener2;
import com.handmark.pulltorefresh.library.PullToRefreshListView;

public class OneFragment extends Fragment {

    String room = "204";

    public PullToRefreshListView mPullRefreshListView;
    // private ArrayAdapter mAdapter;
    private int mItemCount = 9;
    // private LinkedList mListItems;

    private MyAdapter mAdapter;
    private List data;

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceStatus) {
        View view = inflater.inflate(R.layout.twolayout, container, false);
        mPullRefreshListView = (PullToRefreshListView) view
                .findViewById(R.id.pull_refresh_list_2);
        mPullRefreshListView.setMode(Mode.PULL_FROM_START);

        return view;
    }


    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onViewCreated(view, savedInstanceState);
        initDatas();
        // mAdapter1 = new MyAdapter(getActivity(), data);

        mAdapter = new MyAdapter(getActivity(), data, room,mPullRefreshListView);
        mPullRefreshListView.setAdapter(mAdapter);
        mPullRefreshListView
                .setOnRefreshListener(new OnRefreshListener2() {
                    @Override
                    public void onPullDownToRefresh(
                            PullToRefreshBase refreshView) {
                        Log.e("TAG", "onPullDownToRefresh");
                        // 這裡寫下拉刷新的任務
                        new GetDataTask().execute();
                    }

                    @Override
                    public void onPullUpToRefresh(
                            PullToRefreshBase refreshView) {
                        Log.e("TAG", "onPullUpToRefresh");
                        // 這裡寫上拉加載更多的任務
                        new GetDataTask().execute();
                    }
                });
        mPullRefreshListView.setRefreshing(true);
    }

    private void initDatas() {
        // 初始化數據和數據源
        data = new ArrayList();

        for (int i = 0; i < mItemCount; i++) {
            data.add(new ComputerRoomStatus(i, "1", "1", "3", "1", "1", "1"));
        }
    }

    protected void autoRefresh() {
        mPullRefreshListView.setRefreshing(true);
    }


    // 請求網絡接口，這裡是做的假數據
    private class GetDataTask extends AsyncTask {

        @Override
        protected String doInBackground(Void... params) {
            try {
                // TODO 解析json
                Thread.sleep(1000);
            } catch (InterruptedException e) {
            }
            return "" + (mItemCount++);
        }

        @Override
        protected void onPostExecute(String result) {
            // data.add(new
            // ComputerRoomStatus(1,result,result,result,result,result,result));
            data.add(new ComputerRoomStatus(Integer.parseInt(result), "", "",
                    "3", "1", "1", "1"));
            mAdapter.notifyDataSetChanged();
            mPullRefreshListView.onRefreshComplete();
        }
    }
}

MyAdapter

package com.example.adapter;

import java.util.List;

import android.content.Context;
import android.content.DialogInterface;
import android.content.res.ColorStateList;
import android.graphics.Color;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;

import com.example.dao.ComputerRoomStatus;
import com.example.dialog.CustomDialogOrder;
import com.example.fragmentmytest.R;
import com.example.utils.ToastUtils;
import com.handmark.pulltorefresh.library.PullToRefreshListView;

public class MyAdapter extends BaseAdapter {

    private Context context;
    private List data;
    private LayoutInflater layoutInflater;
    private String room;
    private ViewHolder holder = null;
    private PullToRefreshListView mPullRefreshListView;

    public MyAdapter(Context context, List data, String room,PullToRefreshListView mPullRefreshListView) {
        this.context = context;
        this.data = data;
        this.room = room;
        this.mPullRefreshListView = mPullRefreshListView;
        layoutInflater = LayoutInflater.from(context);
    }

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



    @Override
    public Object getItem(int position) {
        return data.get(position);
    }

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        if (convertView == null) {

            holder = new ViewHolder();
            convertView = layoutInflater.inflate(R.layout.lv_item, null);
            holder.seatId = (TextView) convertView.findViewById(R.id.seatId);
            holder.time1 = (Button) convertView.findViewById(R.id.time1);
            holder.time2 = (Button) convertView.findViewById(R.id.time2);
            holder.time3 = (Button) convertView.findViewById(R.id.time3);
            holder.time4 = (Button) convertView.findViewById(R.id.time4);
            holder.time5 = (Button) convertView.findViewById(R.id.time5);
            holder.time6 = (Button) convertView.findViewById(R.id.time6);
            convertView.setTag(holder);

        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        // 獲得集合中實體類對象
        final ComputerRoomStatus s = data.get(position);
        holder.seatId.setText(s.getId() + "");

        holder.time1.setOnClickListener(new lvButtonListener(position));
        holder.time2.setOnClickListener(new lvButtonListener(position));
        holder.time3.setOnClickListener(new lvButtonListener(position));
        holder.time4.setOnClickListener(new lvButtonListener(position));
        holder.time5.setOnClickListener(new lvButtonListener(position));
        holder.time6.setOnClickListener(new lvButtonListener(position));
        //略一部分不要緊的......

        return convertView;
    }

    class lvButtonListener implements View.OnClickListener {
        private int position;

        lvButtonListener(int pos) {
            position = pos;
        }

        @Override
        public void onClick(View v) {
            switch (v.getId()) {
            case R.id.time1:
                showDialog(position, "1");
                break;
            case R.id.time2:
                showDialog(position, "2");
                break;
            case R.id.time3:
                showDialog(position, "3");
                break;
            case R.id.time4:
                showDialog(position, "4");
                break;
            case R.id.time5:
                showDialog(position, "5");
                break;
            case R.id.time6:
                showDialog(position, "6");
                break;
            default:
                break;
            }
        }
    }


    public void showDialog(final int id, final String witch) {
        final CustomDialogOrder.Builder builder = new CustomDialogOrder.Builder(
                context);
        builder.setTitle("預約上機");
        builder.setPositiveButton("預約", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
                // 提交的時候提交application的room和position和witch
                ToastUtils.MyToast(context, room + ":" + id + ":" + witch);
                //TODO 拼接字符串 GET到指定的接口
                //TODO 並且刷新執行下拉刷新
                mPullRefreshListView.setRefreshing(true);
            }
        });

        builder.setNegativeButton("取消",
                new android.content.DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.dismiss();
                    }
                });

        builder.create().show();
    }

}

class ViewHolder {
    TextView seatId;
    Button time1, time2, time3, time4, time5, time6;

}