Android下拉刷新上拉加载简单的实现方法(2)

/**
 * @file XListViewHeader.java
 * @create Apr 18, 2012 5:22:27 PM
 * @author Maxwin
 * @description XListView's header
 */
package me.maxwin.view;

import me.maxwin.R;
import android.content.Context;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;

public class XListViewHeader extends LinearLayout {
 private LinearLayout mContainer;
 private ImageView mArrowImageView;
 private ProgressBar mProgressBar;
 private TextView mHintTextView;
 private int mState = STATE_NORMAL;

private Animation mRotateUpAnim;
 private Animation mRotateDownAnim;
 
 private final int ROTATE_ANIM_DURATION = 180;
 
 public final static int STATE_NORMAL = 0;
 public final static int STATE_READY = 1;
 public final static int STATE_REFRESHING = 2;

public XListViewHeader(Context context) {
  super(context);
  initView(context);
 }

/**
  * @param context
  * @param attrs
  */
 public XListViewHeader(Context context, AttributeSet attrs) {
  super(context, attrs);
  initView(context);
 }

private void initView(Context context) {
  // 鍒濆鎯呭喌锛岃缃笅鎷夊埛鏂皏iew楂樺害涓�0
  LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
    LayoutParams.FILL_PARENT, 0);
  mContainer = (LinearLayout) LayoutInflater.from(context).inflate(
    R.layout.xlistview_header, null);
  addView(mContainer, lp);
  setGravity(Gravity.BOTTOM);

mArrowImageView = (ImageView)findViewById(R.id.xlistview_header_arrow);
  mHintTextView = (TextView)findViewById(R.id.xlistview_header_hint_textview);
  mProgressBar = (ProgressBar)findViewById(R.id.xlistview_header_progressbar);
 
  mRotateUpAnim = new RotateAnimation(0.0f, -180.0f,
    Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
    0.5f);
  mRotateUpAnim.setDuration(ROTATE_ANIM_DURATION);
  mRotateUpAnim.setFillAfter(true);
  mRotateDownAnim = new RotateAnimation(-180.0f, 0.0f,
    Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
    0.5f);
  mRotateDownAnim.setDuration(ROTATE_ANIM_DURATION);
  mRotateDownAnim.setFillAfter(true);
 }

public void setState(int state) {
  if (state == mState) return ;
 
  if (state == STATE_REFRESHING) { // 鏄剧ず杩涘害
   mArrowImageView.clearAnimation();
   mArrowImageView.setVisibility(View.INVISIBLE);
   mProgressBar.setVisibility(View.VISIBLE);
  } else { // 鏄剧ず绠ご鍥剧墖
   mArrowImageView.setVisibility(View.VISIBLE);
   mProgressBar.setVisibility(View.INVISIBLE);
  }
 
  switch(state){
  case STATE_NORMAL:
   if (mState == STATE_READY) {
    mArrowImageView.startAnimation(mRotateDownAnim);
   }
   if (mState == STATE_REFRESHING) {
    mArrowImageView.clearAnimation();
   }
   mHintTextView.setText(R.string.xlistview_header_hint_normal);
   break;
  case STATE_READY:
   if (mState != STATE_READY) {
    mArrowImageView.clearAnimation();
    mArrowImageView.startAnimation(mRotateUpAnim);
    mHintTextView.setText(R.string.xlistview_header_hint_ready);
   }
   break;
  case STATE_REFRESHING:
   mHintTextView.setText(R.string.xlistview_header_hint_loading);
   break;
   default:
  }
 
  mState = state;
 }
 
 public void setVisiableHeight(int height) {
  if (height < 0)
   height = 0;
  LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) mContainer
    .getLayoutParams();
  lp.height = height;
  mContainer.setLayoutParams(lp);
 }

public int getVisiableHeight() {
  return mContainer.getLayoutParams().height;
 }

}

XListView类