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最新推荐文章于 2024-04-04 09:42:51 发布

原创最新推荐文章于 2024-04-04 09:42:51 发布 · 596 阅读

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#布局

下拉刷新代码
1
package com.imooc.listviewfrashdemo1;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;

import com.example.listviewfrashdemo1.R;
import com.imooc.listviewfrashdemo1.ReFlashListView.IReflashListener;

public class MainActivity extends Activity implements IReflashListener{
ArrayList apk_list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setData();
showList(apk_list);
}

MyAdapter adapter;
ReFlashListView listview;
private void showList(ArrayList<ApkEntity> apk_list) {
    if (adapter == null) {
        listview = (ReFlashListView) findViewById(R.id.listview);
        listview.setInterface(this);
        adapter = new MyAdapter(this, apk_list);
        listview.setAdapter(adapter);
    } else {
        adapter.onDateChange(apk_list);
    }
}

private void setData() {
    apk_list = new ArrayList<ApkEntity>();
    for (int i = 0; i < 10; i++) {
        ApkEntity entity = new ApkEntity();
        entity.setName("默认数据");
        entity.setDes("这是一个神奇的应用");
        entity.setInfo("50w用户");
        apk_list.add(entity);
    }
}

private void setReflashData() {
    for (int i = 0; i < 2; i++) {
        ApkEntity entity = new ApkEntity();
        entity.setName("刷新数据");
        entity.setDes("这是一个神奇的应用");
        entity.setInfo("50w用户");
        apk_list.add(0,entity);
    }
}
@Override
public void onReflash() {
    // TODO Auto-generated method stub\
    Handler handler = new Handler();
    handler.postDelayed(new Runnable() {

        @Override
        public void run() {
            // TODO Auto-generated method stub
            //获取最新数据
            setReflashData();
            //通知界面显示
            showList(apk_list);
            //通知listview 刷新数据完毕；
            listview.reflashComplete();
        }
    }, 2000);

}

}
2
package com.imooc.listviewfrashdemo1;

import java.util.ArrayList;

import com.example.listviewfrashdemo1.R;

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

public class MyAdapter extends BaseAdapter {
ArrayList apk_list;
LayoutInflater inflater;

public MyAdapter(Context context, ArrayList<ApkEntity> apk_list) {
    this.apk_list = apk_list;
    this.inflater = LayoutInflater.from(context);
}

public void onDateChange(ArrayList<ApkEntity> apk_list) {
    this.apk_list = apk_list;
    this.notifyDataSetChanged();
}

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return apk_list.size();
}

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

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    ApkEntity entity = apk_list.get(position);
    ViewHolder holder;
    if (convertView == null) {
        holder = new ViewHolder();
        convertView = inflater.inflate(R.layout.item_layout, null);
        holder.name_tv = (TextView) convertView
                .findViewById(R.id.item3_apkname);
        holder.des_tv = (TextView) convertView
                .findViewById(R.id.item3_apkdes);
        holder.info_tv = (TextView) convertView
                .findViewById(R.id.item3_apkinfo);
        convertView.setTag(holder);
    }else{
        holder = (ViewHolder) convertView.getTag();
    }
    holder.name_tv.setText(entity.getName());
    holder.des_tv.setText(entity.getDes());
    holder.info_tv.setText(entity.getInfo());
    return convertView;
}

class ViewHolder {
    TextView name_tv;
    TextView des_tv;
    TextView info_tv;
}

}
3
package com.imooc.listviewfrashdemo1;

public class ApkEntity {
private String name;
private String des;
private String info;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDes() {
return des;
}
public void setDes(String des) {
this.des = des;
}
public String getInfo() {
return info;
}
public void setInfo(String info) {
this.info = info;
}

}
4
package com.imooc.listviewfrashdemo1;

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

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.RotateAnimation;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;

import com.example.listviewfrashdemo1.R;

public class ReFlashListView extends ListView implements OnScrollListener {
View header;// 顶部布局文件；
int headerHeight;// 顶部布局文件的高度；
int firstVisibleItem;// 当前第一个可见的item的位置；
int scrollState;// listview 当前滚动状态；
boolean isRemark;// 标记，当前是在listview最顶端摁下的；
int startY;// 摁下时的Y值；

int state;// 当前的状态；
final int NONE = 0;// 正常状态；
final int PULL = 1;// 提示下拉状态；
final int RELESE = 2;// 提示释放状态；
final int REFLASHING = 3;// 刷新状态；
IReflashListener iReflashListener;//刷新数据的接口
public ReFlashListView(Context context) {
    super(context);
    // TODO Auto-generated constructor stub
    initView(context);
}

public ReFlashListView(Context context, AttributeSet attrs) {
    super(context, attrs);
    // TODO Auto-generated constructor stub
    initView(context);
}

public ReFlashListView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    // TODO Auto-generated constructor stub
    initView(context);
}

/**
 * 初始化界面，添加顶部布局文件到 listview
 * 
 * @param context
 */
private void initView(Context context) {
    LayoutInflater inflater = LayoutInflater.from(context);
    header = inflater.inflate(R.layout.header_layout, null);
    measureView(header);
    headerHeight = header.getMeasuredHeight();
    Log.i("tag", "headerHeight = " + headerHeight);
    topPadding(-headerHeight);
    this.addHeaderView(header);
    this.setOnScrollListener(this);
}

/**
 * 通知父布局，占用的宽，高；
 * 
 * @param view
 */
private void measureView(View view) {
    ViewGroup.LayoutParams p = view.getLayoutParams();
    if (p == null) {
        p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.WRAP_CONTENT);
    }
    int width = ViewGroup.getChildMeasureSpec(0, 0, p.width);
    int height;
    int tempHeight = p.height;
    if (tempHeight > 0) {
        height = MeasureSpec.makeMeasureSpec(tempHeight,
                MeasureSpec.EXACTLY);
    } else {
        height = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
    }
    view.measure(width, height);
}

/**
 * 设置header 布局 上边距；
 * 
 * @param topPadding
 */
private void topPadding(int topPadding) {
    header.setPadding(header.getPaddingLeft(), topPadding,
            header.getPaddingRight(), header.getPaddingBottom());
    header.invalidate();
}

@Override
public void onScroll(AbsListView view, int firstVisibleItem,
        int visibleItemCount, int totalItemCount) {
    // TODO Auto-generated method stub
    this.firstVisibleItem = firstVisibleItem;
}

@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
    // TODO Auto-generated method stub
    this.scrollState = scrollState;
}

@Override
public boolean onTouchEvent(MotionEvent ev) {
    // TODO Auto-generated method stub
    switch (ev.getAction()) {
    case MotionEvent.ACTION_DOWN:
        if (firstVisibleItem == 0) {
            isRemark = true;
            startY = (int) ev.getY();
        }
        break;

    case MotionEvent.ACTION_MOVE:
        onMove(ev);
        break;
    case MotionEvent.ACTION_UP:
        if (state == RELESE) {
            state = REFLASHING;
            // 加载最新数据；
            reflashViewByState();
            iReflashListener.onReflash();
        } else if (state == PULL) {
            state = NONE;
            isRemark = false;
            reflashViewByState();
        }
        break;
    }
    return super.onTouchEvent(ev);
}

/**
 * 判断移动过程操作；
 * 
 * @param ev
 */
private void onMove(MotionEvent ev) {
    if (!isRemark) {
        return;
    }
    int tempY = (int) ev.getY();
    int space = tempY - startY;
    int topPadding = space - headerHeight;
    switch (state) {
    case NONE:
        if (space > 0) {
            state = PULL;
            reflashViewByState();
        }
        break;
    case PULL:
        topPadding(topPadding);
        if (space > headerHeight + 30
                && scrollState == SCROLL_STATE_TOUCH_SCROLL) {
            state = RELESE;
            reflashViewByState();
        }
        break;
    case RELESE:
        topPadding(topPadding);
        if (space < headerHeight + 30) {
            state = PULL;
            reflashViewByState();
        } else if (space <= 0) {
            state = NONE;
            isRemark = false;
            reflashViewByState();
        }
        break;
    }
}

/**
 * 根据当前状态，改变界面显示；
 */
private void reflashViewByState() {
    TextView tip = (TextView) header.findViewById(R.id.tip);
    ImageView arrow = (ImageView) header.findViewById(R.id.arrow);
    ProgressBar progress = (ProgressBar) header.findViewById(R.id.progress);
    RotateAnimation anim = new RotateAnimation(0, 180,
            RotateAnimation.RELATIVE_TO_SELF, 0.5f,
            RotateAnimation.RELATIVE_TO_SELF, 0.5f);
    anim.setDuration(500);
    anim.setFillAfter(true);
    RotateAnimation anim1 = new RotateAnimation(180, 0,
            RotateAnimation.RELATIVE_TO_SELF, 0.5f,
            RotateAnimation.RELATIVE_TO_SELF, 0.5f);
    anim1.setDuration(500);
    anim1.setFillAfter(true);
    switch (state) {
    case NONE:
        arrow.clearAnimation();
        topPadding(-headerHeight);
        break;

    case PULL:
        arrow.setVisibility(View.VISIBLE);
        progress.setVisibility(View.GONE);
        tip.setText("下拉可以刷新！");
        arrow.clearAnimation();
        arrow.setAnimation(anim1);
        break;
    case RELESE:
        arrow.setVisibility(View.VISIBLE);
        progress.setVisibility(View.GONE);
        tip.setText("松开可以刷新！");
        arrow.clearAnimation();
        arrow.setAnimation(anim);
        break;
    case REFLASHING:
        topPadding(50);
        arrow.setVisibility(View.GONE);
        progress.setVisibility(View.VISIBLE);
        tip.setText("正在刷新...");
        arrow.clearAnimation();
        break;
    }
}

/**
 * 获取完数据；
 */
public void reflashComplete() {
    state = NONE;
    isRemark = false;
    reflashViewByState();
    TextView lastupdatetime = (TextView) header
            .findViewById(R.id.lastupdate_time);
    SimpleDateFormat format = new SimpleDateFormat("yyyy年MM月dd日 hh:mm:ss");
    Date date = new Date(System.currentTimeMillis());
    String time = format.format(date);
    lastupdatetime.setText(time);
}

public void setInterface(IReflashListener iReflashListener){
    this.iReflashListener = iReflashListener;
}
/**
 * 刷新数据接口
 * @author Administrator
 */
public interface IReflashListener{
    public void onReflash();
}

}
布局