html瀑布流下拉刷新,能够下拉刷新跟上拉加载的瀑布流
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.View;
import com.etsy.android.grid.StaggeredGridView;
import com.handmark.pulltorefresh.library.OverscrollHelper;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.R;
@SuppressLint("NewApi")
public class PullToRefreshStaggeredGridView extends
PullToRefreshBase {
private static final OnRefreshListener defaultOnRefreshListener = new OnRefreshListener() {
@Override
public void onRefresh(PullToRefreshBase refreshView) {
}
};
public PullToRefreshStaggeredGridView(Context context) {
super(context);
/**
* Added so that by default, Pull-to-Refresh refreshes the page
*/
setOnRefreshListener(defaultOnRefreshListener);
}
public PullToRefreshStaggeredGridView(Context context, AttributeSet attrs) {
super(context, attrs);
/**
* Added so that by default, Pull-to-Refresh refreshes the page
*/
setOnRefreshListener(defaultOnRefreshListener);
}
public PullToRefreshStaggeredGridView(Context context, Mode mode) {
super(context, mode);
/**
* Added so that by default, Pull-to-Refresh refreshes the page
*/
setOnRefreshListener(defaultOnRefreshListener);
}
public PullToRefreshStaggeredGridView(Context context, Mode mode,
AnimationStyle style) {
super(context, mode, style);
/**
* Added so that by default, Pull-to-Refresh refreshes the page
*/
setOnRefreshListener(defaultOnRefreshListener);
}
@Override
public final Orientation getPullToRefreshScrollDirection() {
return Orientation.VERTICAL;
}
@Override
protected StaggeredGridView createRefreshableView(Context context,
AttributeSet attrs) {
StaggeredGridView gridView;
if (VERSION.SDK_INT >= VERSION_CODES.GINGERBREAD) {
gridView = new InternalStaggeredGridViewSDK9(context, attrs);
} else {
gridView = new StaggeredGridView(context, attrs);
}
gridView.setId(R.id.gridview);
return gridView;
}
@Override
protected boolean isReadyForPullStart() {
boolean result = false;
View v = getRefreshableView().getChildAt(0);
if (getRefreshableView().getFirstVisiblePosition() == 0) {
if (v != null) {
// getTop() and getBottom() are relative to the ListView,
// so if getTop() is negative, it is not fully visible
boolean isTopFullyVisible = v.getTop() >= 0;
result = isTopFullyVisible;
}
}
return result;
}
@Override
protected boolean isReadyForPullEnd() {
boolean result = false;
int last = getRefreshableView().getChildCount() - 1;
View v = getRefreshableView().getChildAt(last);
int firstVisiblePosition = getRefreshableView()
.getFirstVisiblePosition();
int visibleItemCount = getRefreshableView().getChildCount();
int itemCount = getRefreshableView().getAdapter().getCount();
if (firstVisiblePosition + visibleItemCount >= itemCount) {
if (v != null) {
boolean isLastFullyVisible = v.getBottom() <= getRefreshableView()
.getHeight();
result = isLastFullyVisible;
}
}
return result;
}
@Override
protected void onPtrRestoreInstanceState(Bundle savedInstanceState) {
super.onPtrRestoreInstanceState(savedInstanceState);
}
@Override
protected void onPtrSaveInstanceState(Bundle saveState) {
super.onPtrSaveInstanceState(saveState);
}
@TargetApi(9)
final class InternalStaggeredGridViewSDK9 extends StaggeredGridView {
// WebView doesn't always scroll back to it's edge so we add some
// fuzziness
static final int OVERSCROLL_FUZZY_THRESHOLD = 2;
// WebView seems quite reluctant to overscroll so we use the scale
// factor to scale it's value
static final float OVERSCROLL_SCALE_FACTOR = 1.5f;
public InternalStaggeredGridViewSDK9(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected boolean overScrollBy(int deltaX, int deltaY, int scrollX,
int scrollY, int scrollRangeX, int scrollRangeY,
int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) {
final boolean returnValue = super.overScrollBy(deltaX, deltaY,
scrollX, scrollY, scrollRangeX, scrollRangeY,
maxOverScrollX, maxOverScrollY, isTouchEvent);
// Does all of the hard work...
OverscrollHelper.overScrollBy(PullToRefreshStaggeredGridView.this,
deltaX, scrollX, deltaY, getScrollRange(), isTouchEvent);
return returnValue;
}
/**
* Taken from the AOSP ScrollView source
*/
private int getScrollRange() {
int scrollRange = 0;
if (getChildCount() > 0) {
View child = getChildAt(0);
scrollRange = Math.max(0, child.getHeight()
- (getHeight() - getPaddingBottom() - getPaddingTop()));
}
return scrollRange;
}
}
}
然后我们自定义布局文件，使用我们重新写好的控件