如何手动修改TabPageIndicator的title的解决办法

如何手动修改TabPageIndicator的title的解决办法

理解初始化
首先让我们看看为什么 getPageTitle 这个方法可以初始化 TabPageIndicator的 title 。我先把 TabPageIndicator 的源码贴出来先

package com.viewpagerindicator;

import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.TextView;

import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;


public class TabPageIndicator extends HorizontalScrollView implements PageIndicator {

private static final CharSequence EMPTY_TITLE = "";


public interface OnTabReselectedListener {

void onTabReselected(int position);
}

private Runnable mTabSelector;

private final OnClickListener mTabClickListener = new OnClickListener() {
public void onClick(View view) {
TabView tabView = (TabView)view;
final int oldSelected = mViewPager.getCurrentItem();
final int newSelected = tabView.getIndex();
mViewPager.setCurrentItem(newSelected);
if (oldSelected == newSelected && mTabReselectedListener != null) {
mTabReselectedListener.onTabReselected(newSelected);
}
}
};

private final IcsLinearLayout mTabLayout;

private ViewPager mViewPager;
private OnPageChangeListener mListener;

private int mMaxTabWidth;
private int mSelectedTabIndex;

private OnTabReselectedListener mTabReselectedListener;

public TabPageIndicator(Context context) {
this(context, null);
}

public TabPageIndicator(Context context, AttributeSet attrs) {
super(context, attrs);
setHorizontalScrollBarEnabled(false);

mTabLayout = new IcsLinearLayout(context, R.attr.vpiTabPageIndicatorStyle);
addView(mTabLayout, new ViewGroup.LayoutParams(WRAP_CONTENT, MATCH_PARENT));
}

public void setOnTabReselectedListener(OnTabReselectedListener listener) {
mTabReselectedListener = listener;
}

@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
final boolean lockedExpanded = widthMode == MeasureSpec.EXACTLY;
setFillViewport(lockedExpanded);

final int childCount = mTabLayout.getChildCount();
if (childCount > 1 && (widthMode == MeasureSpec.EXACTLY || widthMode == MeasureSpec.AT_MOST)) {
if (childCount > 2) {
mMaxTabWidth = (int)(MeasureSpec.getSize(widthMeasureSpec) * 0.8f);
} else {
mMaxTabWidth = MeasureSpec.getSize(widthMeasureSpec) / 2;
}
} else {
mMaxTabWidth = -1;
}

final int oldWidth = getMeasuredWidth();
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
final int newWidth = getMeasuredWidth();

if (lockedExpanded && oldWidth != newWidth) {
// Recenter the tab display if we're at a new (scrollable) size.
setCurrentItem(mSelectedTabIndex);
}
}

private void animateToTab(final int position) {
final View tabView = mTabLayout.getChildAt(position);
if (mTabSelector != null) {
removeCallbacks(mTabSelector);
}
mTabSelector = new Runnable() {
public void run() {
final int scrollPos = tabView.getLeft() - (getWidth() - tabView.getWidth()) / 2;
smoothScrollTo(scrollPos, 0);
mTabSelector = null;
}
};
post(mTabSelector);
}

@Override
public void onAttachedToWindow() {
super.onAttachedToWindow();
if (mTabSelector != null) {
// Re-post the selector we saved
post(mTabSelector);
}
}

@Override
public void onDetachedFromWindow() {
super.onDetachedFromWindow();
if (mTabSelector != null) {
removeCallbacks(mTabSelector);
}
}

private void addTab(int index, CharSequence text, int iconResId) {
final TabView tabView = new TabView(getContext());
tabView.mIndex = index;
tabView.setFocusable(true);
tabView.setOnClickListener(mTabClickListener);
tabView.setText(text);

if (iconResId != 0) {
tabView.setCompoundDrawablesWithIntrinsicBounds(iconResId, 0, 0, 0);
}

mTabLayout.addView(tabView, new LinearLayout.LayoutParams(0, MATCH_PARENT, 1));
}

@Override
public void onPageScrollStateChanged(int arg0) {
if (mListener != null) {
mListener.onPageScrollStateChanged(arg0);
}
}

@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
if (mListener != null) {
mListener.onPageScrolled(arg0, arg1, arg2);
}
}

@Override
public void onPageSelected(int arg0) {
setCurrentItem(arg0);
if (mListener != null) {
mListener.onPageSelected(arg0);
}
}

@Override
public void setViewPager(ViewPager view) {
if (mViewPager == view) {
return;
}
if (mViewPager != null) {
mViewPager.setOnPageChangeListener(null);
}
final PagerAdapter adapter = view.getAdapter();
if (adapter == null) {
throw new IllegalStateException("ViewPager does not have adapter instance.");
}
mViewPager = view;
view.setOnPageChangeListener(this);
notifyDataSetChanged();
}

public void notifyDataSetChanged() {
mTabLayout.removeAllViews();
PagerAdapter adapter = mViewPager.getAdapter();
IconPagerAdapter iconAdapter = null;
if (adapter instanceof IconPagerAdapter) {
iconAdapter = (IconPagerAdapter)adapter;
}
final int count = adapter.getCount();
for (int i = 0; i < count; i++) {
CharSequence title = adapter.getPageTitle(i);
if (title == null) {
title = EMPTY_TITLE;
}
int iconResId = 0;
if (iconAdapter != null) {
iconResId = iconAdapter.getIconResId(i);
}
addTab(i, title, iconResId);
}
if (mSelectedTabIndex > count) {
mSelectedTabIndex = count - 1;
}
setCurrentItem(mSelectedTabIndex);
requestLayout();
}

@Override
public void setViewPager(ViewPager view, int initialPosition) {
setViewPager(view);
setCurrentItem(initialPosition);
}

@Override
public void setCurrentItem(int item) {
if (mViewPager == null) {
throw new IllegalStateException("ViewPager has not been bound.");
}
mSelectedTabIndex = item;
mViewPager.setCurrentItem(item);

final int tabCount = mTabLayout.getChildCount();
for (int i = 0; i < tabCount; i++) {
final View child = mTabLayout.getChildAt(i);
final boolean isSelected = (i == item);
child.setSelected(isSelected);
if (isSelected) {
animateToTab(item);
}
}
}

@Override
public void setOnPageChangeListener(OnPageChangeListener listener) {
mListener = listener;
}

public OnPageChangeListener getOnPageChangeListener() {
return mListener;
}

private class TabView extends TextView {
private int mIndex;

public TabView(Context context) {
super(context, null, R.attr.vpiTabPageIndicatorStyle);
}

@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);

// Re-measure if we went beyond our maximum size.
if (mMaxTabWidth > 0 && getMeasuredWidth() > mMaxTabWidth) {
super.onMeasure(MeasureSpec.makeMeasureSpec(mMaxTabWidth, MeasureSpec.EXACTLY),
heightMeasureSpec);
}
}

public int getIndex() {
return mIndex;
}
}
}

理解初始化 首先让我们看看为什么 getpagetitle 这个方法可以初始化 tabpageindicator的 title 。我先把 tabpageindicator 的源码贴出来先 /* * copyright (c) 2011 the android open source project * copyright (c) 2011 jake wharton * * lic...

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