Android下拉刷新和加載更多

/***************************PFView.java*********************************/


/**
 * 2013-9-21 下午11:12:45 Created By niexiaoqiang
 */

package com.xiaoqiang.m;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Locale;

import android.content.Context;
import android.database.DataSetObserver;
import android.graphics.Color;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.ScrollView;
import android.widget.TextView;

/**
 * 1.下拉刷新及加載更多 2.實例控件后需要對設置FPAdapter和PFListener
 * 3.如果沒有加載到數據，或者其他錯誤對FPAdaptersetNoda_tip(String noda_tip, boolean
 * isclearallview)信息，在onmore時isclearallview為TRUE，onfresh時候為isclearallview為false
 * 4.onePagenum控制一頁顯示多少數據，向服務器遞交分頁大小
 */
public class PFView extends ScrollView implements OnTouchListener {

    /************************** 對外使用這些方法就足夠了 **************************************/
    /**
     * 初始化加載數據調用該方法，觸發監聽器中的onload方法
     */
    public void loadData() {
        if (null != pfListener) {
            clearAllview();
            // 初始化的時候顯示正在初始化
            current_state = constant.refrushState.LOADING;
            changeHeaderViewByState(current_state);
            pfListener.onLoad();
        }
    }

    /**
     * 設置設配器
     *
     * @param pullRefreshAdapter
     */
    public void setPFAdapter(PFAdapter pfAdapter) {
        this.pfAdapter = pfAdapter;
        pfAdapter.registerDataSetObserver(dataSetObserver);
    }

    /**
     * 設置監聽器
     *
     * @param pullRefreshListener
     */
    public void setPullRefreshListener(PFListener pullRefreshListener) {
        this.pfListener = pullRefreshListener;
    }

    /**
     * 監聽器
     *
     * @author niexiaoq
     *
     */
    public interface PFListener {
        /**
         * 下拉刷新
         */
        public void onRefresh();

        /**
         * 加載數據
         */
        public void onLoad();

        /**
         * 更多
         */
        public void onMore();
    }

    /************************** 對外使用這些方法就足夠了 **************************************/

    /******************************** 更多 ************************************/
    private int onePagenum = 20;

    /******************************** 更多 ************************************/

    /**
     * 清除加載進來的所有view,頭部不會被清理
     */
    private void clearAllview() {
        ArrayList<View> currentviews = new ArrayList<View>();
        for (int i = 0; i < contentLayout.getChildCount(); i++) {
            currentviews.add(contentLayout.getChildAt(i));
        }
        for (int i = 0; i < currentviews.size(); i++) {
            View child = currentviews.get(i);
            if (pf_header == child) {
                continue;
            }
            try {
                contentLayout.removeView(currentviews.get(i));
            }
            catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }

    /*********************** 滑動相關 ***************/
    private int touch_down_y = 0;
    private int touch_move_y = 0;
    private int touch_down_distance = 0;
    private int touch_down_total_distance = 0;
    private int pulldown_speed = 2;
    private boolean isBack = false;
    private boolean isError_topull = false;
    private int current_state = constant.refrushState.LOADING;
    private PFListener pfListener = null;
    private PFAdapter pfAdapter = null;

    /*********************** 滑動相關 ***************/
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        this.sv_scrollto(event);
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                touch_down_y = (int) event.getY();
                touch_down_distance = 0;
                break;
            case MotionEvent.ACTION_MOVE:
                touch_move_y = (int) event.getY();
                if (touch_down_y == 0) {
                    touch_down_y = touch_move_y;
                    touch_down_distance = 0;
                }
                touch_down_distance = touch_move_y - touch_down_y;
                touch_down_y = touch_move_y;
                pulldown(touch_down_distance);
                break;
            case MotionEvent.ACTION_UP:
                touch_down_y = 0;
                touch_down_distance = 0;
                touch_down_total_distance = 0;
                if (current_state != constant.refrushState.REFRESHING && current_state != constant.refrushState.LOADING && current_state != constant.refrushState.ONMORE) {
                    if (current_state == constant.refrushState.DONE) {
                    }
                    if (current_state == constant.refrushState.PULL_To_REFRESH) {
                        if (isError_topull) {
                            isError_topull = false;
                            current_state = constant.refrushState.ERROR;
                        } else {
                            current_state = constant.refrushState.DONE;
                        }
                        changeHeaderViewByState(current_state);
                    }
                    if (current_state == constant.refrushState.RELEASE_To_REFRESH) {
                        current_state = constant.refrushState.REFRESHING;
                        changeHeaderViewByState(current_state);
                        if (null != pfListener) {
                            pfListener.onRefresh();
                        }
                    }
                }
                break;
            default:
                break;
        }
        return true;
    }

    /************* 滾動定義 ****************/
    private int sv_starty = 0;
    private int sv_downy = 0;
    private int sv_max_scrolly = 0;

    /*************** 滾動定義 **************/
    /**
     * 滾動
     *
     * @param y
     */
    private void sv_scrollto(MotionEvent event) {
        sv_max_scrolly = contentLayout.getHeight() - PFView.this.getHeight();
        int instatnce_y = 0;
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                sv_starty = (int) event.getY();
                break;
            case MotionEvent.ACTION_MOVE:
                sv_downy = (int) event.getY();
                instatnce_y = sv_downy - sv_starty;
                sv_starty = sv_downy;
                break;
            case MotionEvent.ACTION_UP:
                sv_downy = (int) event.getY();
                break;
            default:
                break;
        }
        int current_y = getScrollY();
        // 只能向上
        if (current_y <= 0) {
            if (instatnce_y > 0) {
                return;
            } else {
                this.scrollTo(0, current_y - instatnce_y);
            }
        } else if (current_y >= sv_max_scrolly) {
            if (instatnce_y < 0) {
                return;
            } else {
                this.scrollTo(0, current_y - instatnce_y);
            }
        } else {
            this.scrollTo(0, current_y - instatnce_y);
        }
    }

    /**
     * 下拉
     *
     * @param distance
     */
    private void pulldown(int distance) {
        if (current_state == constant.refrushState.REFRESHING || current_state == constant.refrushState.LOADING || current_state == constant.refrushState.ONMORE) {
            return;
        }
        // PULL_To_REFRESH狀態下
        if (current_state == constant.refrushState.PULL_To_REFRESH) {
            // 下拉到可以進入RELEASE_TO_REFRESH的狀態
            if (touch_down_total_distance >= HeaderViewHeight) {
                current_state = constant.refrushState.RELEASE_To_REFRESH;
                isBack = true;
                changeHeaderViewByState(current_state);
            }
            // 上推到頂了
            else if (touch_down_total_distance <= 0) {
                current_state = constant.refrushState.DONE;
                changeHeaderViewByState(current_state);
            }
        }
        // RELEASE_To_REFRESH狀態下
        if (current_state == constant.refrushState.RELEASE_To_REFRESH) {
            if (touch_down_total_distance < HeaderViewHeight && touch_down_total_distance > 0) {
                current_state = constant.refrushState.PULL_To_REFRESH;
                changeHeaderViewByState(current_state);
            }
            // 一下子推到頂了
            else if (touch_down_total_distance <= 0) {
                current_state = constant.refrushState.DONE;
                changeHeaderViewByState(current_state);
            }
        }
        // done狀態下
        if (current_state == constant.refrushState.DONE || current_state == constant.refrushState.ERROR) {
            if (current_state == constant.refrushState.ERROR) {
                isError_topull = true;
                touch_down_total_distance = HeaderViewHeight;
            }
            if (distance > 0) {
                current_state = constant.refrushState.PULL_To_REFRESH;
                changeHeaderViewByState(current_state);
            }
        }
        // 累加總長度
        touch_down_total_distance += distance / pulldown_speed;
        // 更新headView的size
        if (current_state == constant.refrushState.PULL_To_REFRESH) {
            pf_header.setPadding(0, -1 * HeaderViewHeight + touch_down_total_distance, 0, 0);

        }
        // 更新headView的paddingTop
        if (current_state == constant.refrushState.RELEASE_To_REFRESH) {
            pf_header.setPadding(0, touch_down_total_distance - HeaderViewHeight, 0, 0);
        }
    }

    /**
     * 刷新完成，或初始化加載完成時，調用
     */
    private void onRefresh_LoadingComplete(boolean isscrolltotop) {
        current_state = constant.refrushState.DONE;
        Date date = new Date();
        pf_header_refreshtime.setText("最近更新:" + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.CHINA).format(date));
        changeHeaderViewByState(current_state);
        this.invalidate();
        if (isscrolltotop) {
            scrollTo(0, 0);
        }
    }

    /**
     * 刷新完成，但加載失敗，可能是網絡或者其他錯誤，予以提示，數據從適配器中來
     */
    private void onRefresh_Error(String errortip) {
        this.errortip = errortip;
        current_state = constant.refrushState.ERROR;
        Date date = new Date();
        pf_header_refreshtime.setText("最近更新:" + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.CHINA).format(date));
        changeHeaderViewByState(current_state);
        this.invalidate();
        scrollTo(0, 0);
    }

    /************** 構造函數 及其他方法 ***************/
    /******************* 關于頭部文件 ********************/
    private LinearLayout contentLayout = null;
    /**
     * 頭部
     */
    private LinearLayout pf_header = null;
    /**
     * 頭部下拉記載刷新箭頭
     */
    private ImageView pf_header_ico_view = null;
    /**
     * 頭部下拉刷新進度條
     */
    private ProgressBar pf_header_progressbar = null;

    /**
     * 頭部顯示更新時間
     */
    private TextView pf_header_refreshtime = null;
    /**
     * 頭部提示文字
     */
    private TextView pf_header_pullnote = null;

    private int HeaderViewHeight = 150;

    /*** 旋轉動畫 **********/
    private RotateAnimation animation;

    private RotateAnimation reverseAnimation;

    private String errortip = "";

    /**
     * 更多按鈕
     */
    private Button morebutton;

    /******************* 關于頭部文件 ********************/

    public PFView(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.init(context);
    }

    public PFView(Context context) {
        super(context);
        this.init(context);
    }

    public PFView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        this.init(context);
    }

    /**
     * 初始化
     *
     * @param context
     */
    private void init(Context context) {
        /****** 內容容器 *********/
        contentLayout = new LinearLayout(context);
        contentLayout.setOrientation(LinearLayout.VERTICAL);
        this.setOnTouchListener(this);
        this.addView(contentLayout, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
        /****** 內容容器 *********/
        /****** 頭部初始化 *********/
        pf_header = (LinearLayout) GetPartView(context, R.layout.pf_header);
        pf_header.setPadding(0, -1 * HeaderViewHeight, 0, 0);
        pf_header.invalidate();
        contentLayout.addView(pf_header, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
        pf_header_ico_view = (ImageView) pf_header.findViewById(R.id.pf_header_ico_view);
        pf_header_progressbar = (ProgressBar) pf_header.findViewById(R.id.pf_header_progressbar);
        pf_header_pullnote = (TextView) pf_header.findViewById(R.id.pf_header_pullnote);
        pf_header_refreshtime = (TextView) pf_header.findViewById(R.id.pf_header_refreshtime);
        /****** 頭部初始化 *********/
        /************* 動畫初始化 ***************/
        animation = new RotateAnimation(0, -180, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        animation.setInterpolator(new LinearInterpolator());
        animation.setDuration(250);
        animation.setFillAfter(true);
        reverseAnimation = new RotateAnimation(-180, 0, RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
        reverseAnimation.setInterpolator(new LinearInterpolator());
        reverseAnimation.setDuration(200);
        reverseAnimation.setFillAfter(true);
        /************* 動畫初始化 ***************/
        morebutton = new Button(context);
        morebutton.setText("更多...");
        morebutton.setTextColor(Color.BLACK);
        morebutton.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
        morebutton.setGravity(Gravity.CENTER);
        morebutton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                if (null != pfListener) {
                    if (current_state == constant.refrushState.DONE) {
                        current_state = constant.refrushState.ONMORE;
                        pfListener.onMore();
                    }
                }
            }
        });
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        this.onTouch(this, ev);
        return false;
    }

    /**
     * 獲取部分UI
     *
     * @param context
     * @param resourceId
     * @return
     */
    private View GetPartView(Context context, int resourceId) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        return inflater.inflate(resourceId, null);
    }

    /************** 構造函數 及其他方法 ****************/

    /**
     * 當狀態改變時候，調用該方法，以更新界面
     */
    private void changeHeaderViewByState(int state) {
        switch (state) {
            case constant.refrushState.RELEASE_To_REFRESH:
                pf_header_ico_view.setVisibility(View.VISIBLE);
                pf_header_progressbar.setVisibility(View.GONE);
                pf_header_pullnote.setVisibility(View.VISIBLE);
                pf_header_refreshtime.setVisibility(View.VISIBLE);
                pf_header_ico_view.clearAnimation();
                pf_header_ico_view.startAnimation(animation);
                pf_header_pullnote.setText("松開刷新");
                break;
            case constant.refrushState.PULL_To_REFRESH:
                pf_header_progressbar.setVisibility(View.GONE);
                pf_header_pullnote.setVisibility(View.VISIBLE);
                pf_header_refreshtime.setVisibility(View.VISIBLE);
                pf_header_ico_view.clearAnimation();
                pf_header_ico_view.setVisibility(View.VISIBLE);
                // 是由RELEASE_To_REFRESH狀態轉變來的
                if (isBack) {
                    isBack = false;
                    pf_header_ico_view.clearAnimation();
                    pf_header_ico_view.startAnimation(reverseAnimation);
                    pf_header_pullnote.setText("下拉刷新");
                } else {
                    pf_header_pullnote.setText("下拉刷新");
                }
                break;
            case constant.refrushState.REFRESHING:
                pf_header.setPadding(0, 0, 0, 0);
                pf_header_progressbar.setVisibility(View.VISIBLE);
                pf_header_ico_view.clearAnimation();
                pf_header_ico_view.setVisibility(View.GONE);
                pf_header_pullnote.setText("正在刷新...");
                pf_header_refreshtime.setVisibility(View.VISIBLE);
                morebutton.setText("更多...");
                break;
            case constant.refrushState.LOADING:
                pf_header.setPadding(0, 0, 0, 0);
                pf_header_progressbar.setVisibility(View.VISIBLE);
                pf_header_ico_view.clearAnimation();
                pf_header_ico_view.setVisibility(View.GONE);
                pf_header_pullnote.setText("正在初始化...");
                pf_header_refreshtime.setVisibility(View.GONE);
                morebutton.setText("更多...");
                break;
            case constant.refrushState.DONE:
                pf_header.setPadding(0, -1 * HeaderViewHeight, 0, 0);
                pf_header_progressbar.setVisibility(View.GONE);
                pf_header_ico_view.clearAnimation();
                pf_header_ico_view.setImageResource(R.drawable.pf_header_down_ico);
                pf_header_pullnote.setText("下拉刷新");
                pf_header_refreshtime.setVisibility(View.VISIBLE);
                break;
            case constant.refrushState.ERROR:
                pf_header.setPadding(0, 0, 0, 0);
                pf_header_progressbar.setVisibility(View.GONE);
                pf_header_ico_view.clearAnimation();
                pf_header_ico_view.setVisibility(View.GONE);
                pf_header_pullnote.setText(errortip);
                pf_header_refreshtime.setVisibility(View.VISIBLE);
                morebutton.setText("更多...");
                break;
        }
    }

    /**
     * 常量
     *
     * @author niexiaoq
     */
    public static class constant {

        /**
         * 狀態
         *
         * @author niexiaoq
         */
        public static class refrushState {
            public final static int ERROR = -1;

            public final static int RELEASE_To_REFRESH = 0;

            public final static int PULL_To_REFRESH = 1;

            public final static int REFRESHING = 2;

            public final static int DONE = 3;

            public final static int LOADING = 4;

            public final static int ONMORE = 5;
        }

        /**
         * 數據行的布局參數
         */
        public final static LinearLayout.LayoutParams dataViewParas = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
    }

    /**
     * 調用pullRefreshAdapter。notifyDataSetChanged() 通知發生更改； dataSetObserver開始動作，
     */
    private DataSetObserver dataSetObserver = new DataSetObserver() {
        @Override
        public void onChanged() {
            super.onChanged();
            if (current_state == constant.refrushState.ONMORE) {
                if (pfAdapter.isSucess()) {
                    // 清除最后一個控件
                    contentLayout.removeViewAt(contentLayout.getChildCount() - 1);
                    // 追加 ps:移除更多按鈕和頭部后，就是在加載更多之前的的數量
                    int current_total = contentLayout.getChildCount() - 1;
                    ArrayList<? extends View> list = pfAdapter.getAllview();
                    // list需要大于當前的數量，加載更多才成功了，否則失敗，或者沒有更多數據，同樣可以獲取TIP信息
                    if (list.size() > current_total) {
                        for (int i = current_total; i < list.size(); i++) {
                            contentLayout.addView(list.get(i), constant.dataViewParas);
                        }
                    }
                    // 不添加更多按鈕
                    if (pfAdapter.isMoredata()) {
                        morebutton.setText("更多...");
                        contentLayout.addView(morebutton, constant.dataViewParas);
                    }
                } else {
                    morebutton.setText(pfAdapter.getErrortip());
                    contentLayout.addView(morebutton, constant.dataViewParas);
                }
                onRefresh_LoadingComplete(false);
            } else {
                if (pfAdapter.isSucess()) {
                    clearAllview();
                    ArrayList<? extends View> list = pfAdapter.getAllview();
                    if (list.size() > 0) {
                        for (View view : list) {
                            contentLayout.addView(view, constant.dataViewParas);
                        }
                        if (list.size() >= onePagenum && pfAdapter.isMoredata()) {
                            // 添加跟過按鈕
                            contentLayout.addView(morebutton, constant.dataViewParas);
                        }
                        onRefresh_LoadingComplete(true);
                    } else {
                        onRefresh_Error(pfAdapter.getErrortip());
                    }
                } else {
                    onRefresh_Error(pfAdapter.getErrortip());
                }
            }
        }
    };

}

/**********************PFAdapter.java****************/

/**
 * 2013-8-2 上午9:36:42 Created By niexiaoqiang
 */

package com.xiaoqiang.m;

import java.util.ArrayList;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

/**
 * TODO Add Class Description
 */
public class PFAdapter extends BaseAdapter {
    private ArrayList<? extends View> allView;
    private boolean sucess = false;
    private boolean moredata = true;
    private String errortip = "";

    public PFAdapter(Context context, ArrayList<? extends View> allView) {
        this.allView = allView;
    }

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

    @Override
    public Object getItem(int postion) {
        return allView.get(postion);
    }

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

    @Override
    public View getView(int postion, View arg1, ViewGroup arg2) {
        return allView.get(postion);
    }

    public ArrayList<? extends View> getAllview() {
        return allView;
    }

    public void notifyDataSetChanged(boolean sucess, boolean moredata, String errortip) {
        this.sucess = sucess;
        this.moredata = moredata;
        this.errortip = errortip;
        super.notifyDataSetChanged();
    }

    @Override
    @Deprecated
    public void notifyDataSetChanged() {
        super.notifyDataSetChanged();
    }

    public boolean isSucess() {
        return sucess;
    }

    public boolean isMoredata() {
        return moredata;
    }

    public String getErrortip() {
        return errortip;
    }

}

/****************************************MainActivity.java****************************/

package com.xiaoqiang.m;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;

import com.xiaoqiang.m.PFView.PFListener;

public class MainActivity extends Activity {

    private PFView pfView = null;
    private PFAdapter pfAdapter = null;
    private ArrayList<View> arrayList = null;

    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            Bundle bundle = msg.getData();
            pfAdapter.notifyDataSetChanged(bundle.getBoolean("success"), bundle.getBoolean("moredate"), bundle.getString("errortip"));
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        pfView = (PFView) this.findViewById(R.id.m_pfview);
        arrayList = new ArrayList<View>();
        pfAdapter = new PFAdapter(this, arrayList);
        pfView.setPFAdapter(pfAdapter);
        pfView.setPullRefreshListener(new PFListener() {

            @Override
            public void onRefresh() {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            Thread.sleep(2000);
                            arrayList.add(getItemView(MainActivity.this, arrayList.size()));
                            Message m = handler.obtainMessage(1);
                            Bundle bundle = new Bundle();
                            bundle.putBoolean("success", true);
                            bundle.putBoolean("moredate", true);
                            bundle.putString("errortip", "");
                            m.setData(bundle);
                            m.sendToTarget();
                        }
                        catch (Exception e) {
                        }
                    }
                }).start();
            }

            @Override
            public void onLoad() {
                new Thread(new Runnable() {

                    @Override
                    public void run() {
                        try {
                            Thread.sleep(2000);
                            for (int i = 0; i < 21; i++) {
                                arrayList.add(getItemView(MainActivity.this, i));
                            }
                            Message m = handler.obtainMessage(1);
                            Bundle bundle = new Bundle();
                            bundle.putBoolean("success", true);
                            bundle.putBoolean("moredate", true);
                            bundle.putString("errortip", "");
                            m.setData(bundle);
                            m.sendToTarget();
                        }
                        catch (Exception e) {
                        }
                    }
                }).start();

            }

            @Override
            public void onMore() {
                new Thread(new Runnable() {

                    @Override
                    public void run() {
                        try {
                            Thread.sleep(1000);
                            for (int i = 0; i < 10; i++) {
                                arrayList.add(getItemView(MainActivity.this, i));
                            }
                            Message m = handler.obtainMessage(1);
                            Bundle bundle = new Bundle();
                            bundle.putBoolean("success", true);
                            bundle.putBoolean("moredate", false);
                            bundle.putString("errortip", "");
                            m.setData(bundle);
                            m.sendToTarget();
                        }
                        catch (Exception e) {
                        }
                    }
                }).start();

            }
        });

        pfView.loadData();
    }

    private View getItemView(Context context, int i) {
        LinearLayout linearLayout = new LinearLayout(context);
        linearLayout.setBackgroundColor(Color.GREEN);
        linearLayout.setGravity(Gravity.CENTER);
        Button b = new Button(context);
        b.setText("測試按鈕" + i);
        linearLayout.addView(b);
        return linearLayout;
    }
}