Android Open Source - student_travel_app Scroll Refresh List View

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License

The source code is released under:
Apache License
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Java Source Code

package com.piasy.simpletravel;
/*from   www .j a  v a  2s  .co  m*/
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;

public class ScrollRefreshListView extends ListView implements OnScrollListener 
{

  private final static int RELEASE_To_REFRESH = 0;// ?????????
  private final static int PULL_To_REFRESH = 1; // ???????????????
  private final static int REFRESHING = 2;// ?????????
  private final static int DONE = 3;
  private final static int LOADING = 4;

  // ???padding????????????????????
  private final static int RATIO = 3;
  private LayoutInflater inflater;

  // ListView?????????
  private LinearLayout headerView;
  private TextView lvHeaderTipsTv;
//  private TextView lvHeaderLastUpdatedTv;
  private ImageView lvHeaderArrowIv;
  private ProgressBar lvHeaderProgressBar;

  // ??????????????
  private int headerContentHeight;

  private RotateAnimation animation;
  private RotateAnimation reverseAnimation;

  private int startY;
  private int state;
  private boolean isBack;

  // ??????startY????????touch???????????
  private boolean isRecored;

  private OnRefreshListener refreshListener;

  private boolean isRefreshable;

  public ScrollRefreshListView(Context context) 
  {
    super(context);
    init(context);
  }

  public ScrollRefreshListView(Context context, AttributeSet attrs)
  {
    super(context, attrs);
    init(context);
  }

  private void init(Context context) 
  {
    setCacheColorHint(context.getResources().getColor(android.R.color.transparent));
    inflater = LayoutInflater.from(context);
    headerView = (LinearLayout) inflater.inflate(R.layout.lv_header, null);
    lvHeaderTipsTv = (TextView) headerView
        .findViewById(R.id.lvHeaderTipsTv);
//    lvHeaderLastUpdatedTv = (TextView) headerView
//        .findViewById(R.id.lvHeaderLastUpdatedTv);

    lvHeaderArrowIv = (ImageView) headerView
        .findViewById(R.id.lvHeaderArrowIv);
    // ?????????????????
    lvHeaderArrowIv.setMinimumWidth(70);
    lvHeaderArrowIv.setMinimumHeight(50);

    lvHeaderProgressBar = (ProgressBar) headerView
        .findViewById(R.id.lvHeaderProgressBar);
    measureView(headerView);
    headerContentHeight = headerView.getMeasuredHeight();
    // ????????????????????????????????????
    headerView.setPadding(0, -1 * headerContentHeight, 0, 0);
    // ?????
    headerView.invalidate();
    // ??????????ListView???
    addHeaderView(headerView, null, false);
    // ??????????
    setOnScrollListener(this);

    // ????????
    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);

    // ??????????????????????DONE
    state = DONE;
    // ????????
    isRefreshable = false;
  }

  @Override
  public void onScrollStateChanged(AbsListView view, int scrollState) 
  {

  }

  @Override
  public void onScroll(AbsListView view, int firstVisibleItem,
      int visibleItemCount, int totalItemCount) 
  {
        if (firstVisibleItem == 0) 
    {
      isRefreshable = true;
    } 
    else 
    {
      isRefreshable = false;
    }   
  }

  @Override
  public boolean onTouchEvent(MotionEvent ev) 
  {
    if (isRefreshable) 
    {
      switch (ev.getAction()) 
      {
      case MotionEvent.ACTION_DOWN:
        if (!isRecored) 
        {
          isRecored = true;
          startY = (int) ev.getY();// ?????????????
        }
        break;
      case MotionEvent.ACTION_UP:
        if (state != REFRESHING && state != LOADING) 
        {
          if (state == PULL_To_REFRESH) 
          {
            state = DONE;
            changeHeaderViewByState();
          }
          if (state == RELEASE_To_REFRESH) 
          {
            state = REFRESHING;
            changeHeaderViewByState();
            onLvRefresh();
          }
        }
        isRecored = false;
        isBack = false;
        break;

      case MotionEvent.ACTION_MOVE:
        int tempY = (int) ev.getY();
        if (!isRecored) 
        {
          isRecored = true;
          startY = tempY;
        }
        if (state != REFRESHING && isRecored && state != LOADING)
        {
          //???????padding????????????????head?
          //?????????????????????????????????????
          // ????????????
          if (state == RELEASE_To_REFRESH) 
          {
            setSelection(0);
            // ???????????????head??????????????????
            if (((tempY - startY) / RATIO < headerContentHeight)// ??????????????????????
                && (tempY - startY) > 0) 
            {
              state = PULL_To_REFRESH;
              changeHeaderViewByState();
            }
            // ????????
            else if (tempY - startY <= 0) 
            {// ???????????????done???
              state = DONE;
              changeHeaderViewByState();
            }
          }
          // ????????????????,DONE???PULL_To_REFRESH???
          if (state == PULL_To_REFRESH) 
          {
            setSelection(0);
            // ?????????RELEASE_TO_REFRESH????
            if ((tempY - startY) / RATIO >= headerContentHeight)
            {// ?done????????????????????
              state = RELEASE_To_REFRESH;
              isBack = true;
              changeHeaderViewByState();
            }
            // ?????
            else if (tempY - startY <= 0)
            {// ?DOne??????????????done???
              state = DONE;
              changeHeaderViewByState();
            }
          }
          // done????
          if (state == DONE) 
          {
            if (tempY - startY > 0) 
            {
              state = PULL_To_REFRESH;
              changeHeaderViewByState();
            }
          }
          // ??headView?size
          if (state == PULL_To_REFRESH) 
          {
            headerView.setPadding(0, -1 * headerContentHeight
                + (tempY - startY) / RATIO, 0, 0);

          }
          // ??headView?paddingTop
          if (state == RELEASE_To_REFRESH) 
          {
            headerView.setPadding(0, (tempY - startY) / RATIO
                - headerContentHeight, 0, 0);
          }
        }
        break;
      default:
        break;
      }
    }
    return super.onTouchEvent(ev);
  }

  // ????????????????????????
  private void changeHeaderViewByState() 
  {
    switch (state) 
    {
    case RELEASE_To_REFRESH:
      lvHeaderArrowIv.setVisibility(View.VISIBLE);
      lvHeaderProgressBar.setVisibility(View.GONE);
      lvHeaderTipsTv.setVisibility(View.VISIBLE);
//      lvHeaderLastUpdatedTv.setVisibility(View.VISIBLE);

      lvHeaderArrowIv.clearAnimation();// ????
      lvHeaderArrowIv.startAnimation(animation);// ??????

      lvHeaderTipsTv.setText("??????");
      break;
    case PULL_To_REFRESH:
      lvHeaderProgressBar.setVisibility(View.GONE);
      lvHeaderTipsTv.setVisibility(View.VISIBLE);
//      lvHeaderLastUpdatedTv.setVisibility(View.VISIBLE);
      lvHeaderArrowIv.clearAnimation();
      lvHeaderArrowIv.setVisibility(View.VISIBLE);
      // ??RELEASE_To_REFRESH???????????
      if (isBack) 
      {
        isBack = false;
        lvHeaderArrowIv.clearAnimation();
        lvHeaderArrowIv.startAnimation(reverseAnimation);

        lvHeaderTipsTv.setText("????");
      } else 
      {
        lvHeaderTipsTv.setText("????");
      }
      break;
    case REFRESHING:

      headerView.setPadding(0, 0, 0, 0);

      lvHeaderProgressBar.setVisibility(View.VISIBLE);
      lvHeaderArrowIv.clearAnimation();
      lvHeaderArrowIv.setVisibility(View.GONE);
      lvHeaderTipsTv.setText("????...");
//      lvHeaderLastUpdatedTv.setVisibility(View.VISIBLE);
      break;
    case DONE:
      headerView.setPadding(0, -1 * headerContentHeight, 0, 0);

      lvHeaderProgressBar.setVisibility(View.GONE);
      lvHeaderArrowIv.clearAnimation();
      lvHeaderArrowIv.setImageResource(R.drawable.arrow_down);
      lvHeaderTipsTv.setText("????");
//      lvHeaderLastUpdatedTv.setVisibility(View.VISIBLE);
      break;
    }
  }

  // ?????????????????????demo????????headView?width????height
  private void measureView(View child)
  {
    ViewGroup.LayoutParams params = child.getLayoutParams();
    if (params == null)
    {
      params = new ViewGroup.LayoutParams(
          ViewGroup.LayoutParams.FILL_PARENT,
          ViewGroup.LayoutParams.WRAP_CONTENT);
    }
    int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0,
        params.width);
    int lpHeight = params.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 setonRefreshListener(OnRefreshListener refreshListener) 
  {
    this.refreshListener = refreshListener;
    isRefreshable = true;
  }

  public interface OnRefreshListener 
  {
    public void onRefresh();
  }

  public void onRefreshComplete() 
  {
    state = DONE;
    changeHeaderViewByState();
  }

  private void onLvRefresh() 
  {
    if (refreshListener != null) 
    {
      refreshListener.onRefresh();
    }
  }

  public void setAdapter(MyListViewAdapter adapter) 
  {
    super.setAdapter(adapter);
  }

}
Java Source Code List
