package com.example.james_lue;
import android.app.Activity;
import android.content.Context;
import android.database.DataSetObserver;
import android.os.Bundle;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.widget.AbsListView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.ScrollView;
import android.widget.TextView;
public class MorePullDowTest extends Activity {
private static final String LOG_TAG = MorePullDowTest.class.getSimpleName();
MyListAdapter mListAdapter;
MyScrollView myScrollView;
ListView mListView;
TextView mUpTextView;
private int mUpHeight;
private boolean isListTop = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_more_pull_dow_test);
mListAdapter = new MyListAdapter(this);
myScrollView = (MyScrollView) findViewById(R.id.main_scroll_view);
myScrollView.setMorePullTest(this);
mListView = (ListView)findViewById(R.id.main_list_view);
mUpTextView = (TextView)findViewById(R.id.text_up);
mListView.setAdapter(mListAdapter);
mListView.setOnScrollListener(new AbsListView.OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
switch (scrollState) {
case SCROLL_STATE_IDLE:
View c = mListView.getChildAt(0);
int scrollY = -c.getTop() + mListView.getFirstVisiblePosition() * c.getHeight();
if (scrollY == 0) {
isListTop = true;
}
Log.d(LOG_TAG, "scroll: " + scrollState + ", top: " + scrollY);
break;
case SCROLL_STATE_TOUCH_SCROLL:
case SCROLL_STATE_FLING:
isListTop = false;
break;
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
}
});
myScrollView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
// Ensure you call it only once :
myScrollView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
// Here you can get the size :)
ViewGroup.LayoutParams params = mListView.getLayoutParams();
params.height = myScrollView.getHeight();
params.width = myScrollView.getWidth();
mUpHeight = mUpTextView.getHeight();
mListView.setLayoutParams(params);
myScrollView.requestLayout();
}
});
}
private static class MyListAdapter implements ListAdapter {
private Context mContext;
private MyListAdapter(Context context) {
mContext = context;
}
@Override
public boolean areAllItemsEnabled() {
return true;
}
@Override
public boolean isEnabled(int position) {
return true;
}
@Override
public void registerDataSetObserver(DataSetObserver observer) {
}
@Override
public void unregisterDataSetObserver(DataSetObserver observer) {
}
@Override
public int getCount() {
Log.d(LOG_TAG, "getCount");
return 50;
}
@Override
public Object getItem(int position) {
return position + ": item";
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
TextView textView;
if(convertView == null) {
textView = new TextView(mContext);
textView.setWidth(ViewGroup.LayoutParams.MATCH_PARENT);
textView.setHeight(100);
textView.setTextSize(25.0f);
} else {
textView = (TextView)convertView;
}
textView.setText(position + ": item");
//Log.d(LOG_TAG, "po: " + position);
return textView;
}
@Override
public int getItemViewType(int position) {
return 0;
}
@Override
public int getViewTypeCount() {
return 1;
}
@Override
public boolean isEmpty() {
return false;
}
}
public static class MyScrollView extends ScrollView{
private float mInitialY;
private MorePullDowTest mActivity;
public MyScrollView(Context context) {
super(context, null);
setFadingEdgeLength(0);
}
public MyScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
setFadingEdgeLength(0);
}
public MyScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
setFadingEdgeLength(0);
}
public void setMorePullTest(MorePullDowTest activity) {
mActivity = activity;
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
mInitialY = ev.getY();
break;
case MotionEvent.ACTION_MOVE:
final float y = ev.getY();
float yD = y - mInitialY;
boolean shouldScrollBack = (yD > 0 && mActivity.isListTop);
Log.d(LOG_TAG, "yD: " + yD + "shouldScrollBack: " + shouldScrollBack + ", isTop: " + mActivity.isListTop);
if(shouldScrollBack) {
smoothScrollBy(0, 100 * (int) -yD);
mInitialY = y;
return true;
}
break;
}
Log.d(LOG_TAG, "intercept: " + ev.getActionMasked());
return false;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getActionMasked()) {
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
if (this.getScrollY() <= mActivity.mUpHeight) {
smoothScrollTo(0, mActivity.mUpHeight);
//mActivity.canScrollChild = true;
}
}
Log.d(LOG_TAG, "touch: " + event.getActionMasked());
return super.onTouchEvent(event);
}
}
}
layout
