Android常用控件之下拉刷新Wifi列表

headView.setPadding(0, 0, 0, 0);

progressBar.setVisibility(View.VISIBLE);

arrowImageView.clearAnimation();

arrowImageView.setVisibility(View.GONE);

tipsTextview.setText(正在刷新...);

lastUpdatedTextView.setVisibility(View.VISIBLE);

Log.v(TAG, 當(dāng)前狀態(tài),正在刷新...);

break;

case DONE:

headView.setPadding(0, -1 * headContentHeight, 0, 0);

progressBar.setVisibility(View.GONE);

arrowImageView.clearAnimation();

arrowImageView.setImageResource(R.drawable.arrow);

tipsTextview.setText(下拉刷新);

lastUpdatedTextView.setVisibility(View.VISIBLE);

Log.v(TAG, 當(dāng)前狀態(tài)，done);

break;

}

}

public void setonRefreshListener(OnRefreshListener refreshListener) {

this.refreshListener = refreshListener;

isRefreshable = true;

}

public interface OnRefreshListener {

public void onRefresh();

}

public void onRefreshComplete() {

state = DONE;

SimpleDateFormat sdf = new SimpleDateFormat(yyyy-MM-dd HH:mm:ss);

lastUpdatedTextView.setText(最近更新: + sdf.format(new Date()));

changeHeaderViewByState();

}

private void onRefresh() {

if (refreshListener != null) {

refreshListener.onRefresh();

}

}

/**

* 此方法直接照搬自網(wǎng)絡(luò)上的一個下拉刷新的demo，此處是“估計”headView的width以及height

* @param child

*/

private void measureView(View child) {

ViewGroup.LayoutParams p = child.getLayoutParams();

if (p == null) {

p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,

ViewGroup.LayoutParams.WRAP_CONTENT);

}

int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, p.width);

int lpHeight = p.height;

int childHeightSpec;

if (lpHeight > 0) {

childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight,

MeasureSpec.EXACTLY);

} else {

childHeightSpec = MeasureSpec.makeMeasureSpec(0,

MeasureSpec.UNSPECIFIED);

}

child.measure(childWidthSpec, childHeightSpec);

}

public void setAdapter(BaseAdapter adapter) {

SimpleDateFormat sdf = new SimpleDateFormat(yyyy-MM-dd HH:mm:ss);

lastUpdatedTextView.setText(最近更新: + sdf.format(new Date()));

super.setAdapter(adapter);

}

}

main.xml

下拉列表松開后需要掃描Wifi，再刷新列表

106package com.example.dropdownrefresh;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import android.app.Activity;

import android.net.wifi.ScanResult;

import android.os.AsyncTask;

import android.os.Bundle;

import android.view.View;

import android.view.ViewGroup;