package com.example.refreashtabview;
import android.os.Bundle;
import android.support.v4.util.SparseArrayCompat;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.support.v7.app.ActionBarActivity;
import android.text.SpannableString;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.style.ClickableSpan;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.widget.AbsListView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.example.refreashtabview.adapter.SlidingPagerAdapter;
import com.example.refreashtabview.fragment.ScrollTabHolder;
import com.example.refreashtabview.fragment.ScrollTabHolderFragment;
import com.example.refreashtabview.sliding.PagerSlidingTabStrip;
import com.example.refreashtabview.wight.FixLinearLayout;
import com.example.refreashtabview.wight.LinkMovement;
import com.example.refreashtabview.wight.WrapperTextView;
import com.nineoldandroids.view.ViewHelper;
/**
*
*/
public class MainActivity extends ActionBarActivity implements OnPageChangeListener, ScrollTabHolder, View.OnClickListener {
/**
* click on time height add 20px
*/
public static final int OFFSET_HEIGHT = 20;
private PagerSlidingTabStrip tabs;
private ViewPager viewPager;
private SlidingPagerAdapter adapter;
private FixLinearLayout header;
private WrapperTextView descTextView;
private int headerHeight;
private int headerTranslationDis;
private LinearLayout changeHeight;
private TextView changBtn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
getHeaderHeight();
findViews();
setViewsListener();
initDesc();
setupPager();
setupTabs();
}
private void findViews() {
tabs = (PagerSlidingTabStrip) findViewById(R.id.show_tabs);
viewPager = (ViewPager) findViewById(R.id.pager);
header = (FixLinearLayout) findViewById(R.id.header);
descTextView = (WrapperTextView) findViewById(R.id.show_event_detail_desc);
changeHeight = (LinearLayout) findViewById(R.id.change_content);
changBtn = (TextView) findViewById(R.id.change_height);
}
private void setViewsListener() {
changBtn.setOnClickListener(this);
}
private void initDesc() {
SpannableStringBuilder stringBuilder = new SpannableStringBuilder();
stringBuilder.append(getString(R.string.head_title_desc));
String link = getString(R.string.head_title_desc_link);
SpannableString span = new SpannableString(link);
span.setSpan(new ClickableSpan() {
@Override
public void onClick(View widget) {
//
Toast.makeText(MainActivity.this, "clicked", Toast.LENGTH_LONG).show();
}
}, 0, link.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
stringBuilder.append(span);
stringBuilder.append(" ");
descTextView.setText(stringBuilder);
//descTextView.setMovementMethod(LinkMovementMethod.getInstance());
// fix TextView has LinkMovementMethod intercept Scroll event
descTextView.setOnTouchListener(LinkMovement.getInstance());
}
private void getHeaderHeight() {
headerHeight = getResources().getDimensionPixelSize(R.dimen.max_header_height);
headerTranslationDis = -getResources().getDimensionPixelSize(R.dimen.header_offset_dis);
}
private void setupPager() {
adapter = new SlidingPagerAdapter(getSupportFragmentManager(), this, viewPager);
adapter.setTabHolderScrollingListener(this);//控制页面滑动
viewPager.setOffscreenPageLimit(adapter.getCacheCount());
viewPager.setAdapter(adapter);
viewPager.setOnPageChangeListener(this);
}
private void setupTabs() {
tabs.setShouldExpand(true);
tabs.setIndicatorColorResource(R.color.color_purple_bd6aff);
tabs.setUnderlineColorResource(R.color.color_purple_bd6aff);
tabs.setCheckedTextColorResource(R.color.color_purple_bd6aff);
tabs.setViewPager(viewPager);
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
tabs.onPageScrolled(position, positionOffset, positionOffsetPixels);
}
@Override
public void onPageSelected(int position) {
tabs.onPageSelected(position);
reLocation = true;
SparseArrayCompat<ScrollTabHolder> scrollTabHolders = adapter.getScrollTabHolders();
ScrollTabHolder currentHolder = scrollTabHolders.valueAt(position);
currentHolder.adjustScroll((int) (header.getHeight() + ViewHelper.getTranslationY(header)));// 修正滚出去的偏移量
}
@Override
public void onPageScrollStateChanged(int state) {
tabs.onPageScrollStateChanged(state);
}
@Override
public void adjustScroll(int scrollHeight) {
}
private boolean reLocation = false;
private int headerScrollSize = 0;
private int headerTop = 0;
// 刷新头部显示时，没有onScroll回调，只有刷新时有
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount, int pagePosition) {
if (viewPager.getCurrentItem() != pagePosition) {
return;
}
if (headerScrollSize == 0 && reLocation) {
reLocation = false;
return;
}
reLocation = false;
int scrollY = Math.max(-getScrollY(view), headerTranslationDis);
ViewHelper.setTranslationY(header, scrollY);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.change_height:
onChange();
break;
}
}
private void onChange() {
ViewGroup.LayoutParams layoutParams = changeHeight.getLayoutParams();
layoutParams.height += OFFSET_HEIGHT;
changeHeight.setLayoutParams(layoutParams);
changeHeight.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
changeHeight.getViewTreeObserver().removeGlobalOnLayoutListener(this);
headerHeight += OFFSET_HEIGHT;
headerTranslationDis -= OFFSET_HEIGHT;
notifyFragment();
}
});
}
/**
*
*/
private void notifyFragment() {
ScrollTabHolderFragment[] fragments = adapter.getFragments();
for (int i = 0; i < fragments.length; ++i) {
ScrollTabHolderFragment fragment = fragments[i];
if (fragment != null) {
fragment.headerChange();
}
}
}
/**
* 主要算这玩意，PullToRefreshListView插入了一个刷新头部，因此要根据不同的情况计算当前的偏移量</br>
* <p/>
* 当刷新时： 刷新头部显示，因此偏移量要加上刷新头的数值 未刷新时： 偏移量不计算头部。
* <p/>
* firstVisiblePosition >1时，listview中的项开始显示，姑且认为每一项等高来计算偏移量（其实只要显示一个项，向上偏移
* 量已经大于头部的最大偏移量，因此不准确也没有关系）
*
* @param view
* @return
*/
public int getScrollY(AbsListView view) {
View c = view.getChildAt(0);
if (c == null) {
return 0;
}
int top = c.getTop();
int firstVisiblePosition = view.getFirstVisiblePosition();
if (firstVisiblePosition == 0) {
return -top + headerScrollSize;
} else if (firstVisiblePosition == 1) {
return -top;
} else {
return -top + (firstVisiblePosition - 2) * c.getHeight() + headerHeight;
}
}
/**
* 与onHeadScroll互斥，不能同时执行
*
* @param isRefresh
* @param value
* @param pagePosition
*/
@Override
public void onHeaderScroll(boolean isRefresh, int value, int pagePosition) {
if (viewPager.getCurrentItem() != pagePosition) {
return;
}
headerScrollSize = value;
ViewHelper.setTranslationY(header, -value);
}
@Override
public int headerHeight() {
if (headerHeight == 0) {// return default height
return getResources().getDimensionPixelSize(R.dimen.max_header_height);
}
return headerHeight;
}
}
