我从http://www.zylinc.com/blog-reader/items/viewpager-page-indicator.html为viewpagerindicator引用了这段代码。我想在不同的页面上显示不同的视图。现在我可以在每个页面上显示列表项目（3页）但我想显示让我们说textview on第二和第三页。我做了一些更改并使用数组创建了标题这里是
的片段 @Override
public String getTitle(int pos){
Log.i("FragmentList", "current page position is : " +mViewPager.getCurrentItem());
switch (pos) {
case 0:return titles[0];
case 1:return titles[1];
case 2:return titles[2];
default:return titles[0];
}
// pageListener = new DetailOnPageChange();
// mViewPager.setOnPageChangeListener(pageListener);
}
因此，当我更改页面时，我也想更改布局，我想是否可以获取页面的当前位置，我可以将它们放在开关盒中并实现布局...但是因为mViewpager.getcurrentitem正常运行这个函数可以帮助我，我应该实现哪个是我的代码viewpagerindicator activty
package com.zylinc.view;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.zip.Inflater;
import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.app.ListFragment;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class ViewPagerIndicatorActivity extends FragmentActivity
{
DetailOnPageChange pageListener;
PagerAdapter mPagerAdapter;
static ViewPager mViewPager;
ViewPagerIndicator mIndicator;
static TextView stv;
static SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
static SimpleDateFormat readableDateFormat = new SimpleDateFormat("yyyy - MM/dd");
public int numberofPages = 3;
Inflater inflater;
public static final String[] titles = new String[]{"First Page","Second Page","Third Page"};
public static int pos;
public int currentPageIs;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Create our custom adapter to supply pages to the viewpager.
mPagerAdapter = new PagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager)findViewById(R.id.pager);
mViewPager.setAdapter(mPagerAdapter);
// Start at a custom position
mViewPager.setCurrentItem(0);
// Find the indicator from the layout
mIndicator = (ViewPagerIndicator)findViewById(R.id.indicator);
// Set the indicator as the pageChangeListener
mViewPager.setOnPageChangeListener(mIndicator);
// Initialize the indicator. We need some information here:
// * What page do we start on.
// * How many pages are there in total
// * A callback to get page titles
Log.i("number of counts are ", "pages are"+mPagerAdapter.getCount());
mIndicator.init(0, mPagerAdapter.getCount(), mPagerAdapter);
Resources res = getResources();
Drawable prev = res.getDrawable(R.drawable.indicator_prev_arrow);
Drawable next = res.getDrawable(R.drawable.indicator_next_arrow);
mIndicator.setFocusedTextColor(new int[]{255, 0, 0});
// Set images for previous and next arrows.
mIndicator.setArrows(prev, next);
mIndicator.setOnClickListener(new OnIndicatorClickListener());
}
class OnIndicatorClickListener implements ViewPagerIndicator.OnClickListener{
@Override
public void onCurrentClicked(View v) {
Toast.makeText(ViewPagerIndicatorActivity.this, "Hello", Toast.LENGTH_SHORT).show();
}
@Override
public void onNextClicked(View v) {
mViewPager.setCurrentItem(Math.min(mPagerAdapter.getCount() - 1, mIndicator.getCurrentPosition() + 1));
}
@Override
public void onPreviousClicked(View v) {
mViewPager.setCurrentItem(Math.max(0, mIndicator.getCurrentPosition() - 1));
}
}
class PagerAdapter extends FragmentPagerAdapter implements ViewPagerIndicator.PageInfoProvider
{
ArrayList<Fragment> fragments = new ArrayList<Fragment>();
//ArrayList<String> showTitles = new ArrayList<String>();
//String myPos = titles[pos];
public PagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int pos) {
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DAY_OF_MONTH, pos - getCount() / 2);
return ItemFragment.newInstance(cal.getTime());
//return ItemFragment.newInstance(titles[pos]);
}
@Override
public String getTitle(int pos){
Log.i("FragmentList", "current page position is : " +mViewPager.getCurrentItem());
switch (pos) {
case 0:return titles[0];
case 1:return titles[1];
case 2:return titles[2];
default:return titles[0];
}
// pageListener = new DetailOnPageChange();
// mViewPager.setOnPageChangeListener(pageListener);
}
@Override
public int getCount() {
return numberofPages;
}
}
public class DetailOnPageChange extends ViewPager.SimpleOnPageChangeListener{
@Override
public void onPageSelected(int position) {
Log.i("FragmentList", "************* position is : " +currentPageIs);
currentPageIs = position;
}
public int getCurrentPage(){
return currentPageIs;
}
}
public static class ItemFragment extends ListFragment
{
static Date date;
TextView tv;
static ItemFragment newInstance(Date date) {
ItemFragment f = new ItemFragment();
// Supply num input as an argument.
Bundle args = new Bundle();
args.putString("date", sdf.format(date));
f.setArguments(args);
return f;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
try {
this.date = sdf.parse(getArguments().getString("date"));
} catch (ParseException e) {
e.printStackTrace();
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//Log.i("FragmentList", "current page checker position is : " +titles[pos]);
View v = inflater.inflate(R.layout.date_fragment, container, false);
View tv = v.findViewById(R.id.text);
((TextView)tv).setText(readableDateFormat.format(date));
return v;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setListAdapter(new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_1, list));
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
Log.i("FragmentList", "Item clicked: " + id);
}
}
public static final String[] list = new String[]{"France", "London", "Sweden", "Denmark", "Germany", "Finland", "Thailand", "Taiwan", "USA", "Norway", "Lithuania", "Bosnia", "Russia", "Vietnam", "Australia"};
}
这是适配器
package com.zylinc.view;
import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
/**
* An small bar indicating the title of the previous,
* current and next page to be shown in a ViewPager.
* Made to resemble the indicator in the Google+ application
* in function.
*
* @author Mark Gjøl @ Zylinc
*/
public class ViewPagerIndicator extends RelativeLayout implements OnPageChangeListener {
private static final int PADDING = 5;
TextView mPrevious;
TextView mCurrent;
TextView mNext;
int mCurItem;
int mRestoreCurItem = -1;
LinearLayout mPreviousGroup;
LinearLayout mNextGroup;
int mArrowPadding;
int mSize;
ImageView mCurrentIndicator;
ImageView mPrevArrow;
ImageView mNextArrow;
int[] mFocusedTextColor;
int[] mUnfocusedTextColor;
OnClickListener mOnClickHandler;
public interface PageInfoProvider{
String getTitle(int pos);
}
public interface OnClickListener{
void onNextClicked(View v);
void onPreviousClicked(View v);
void onCurrentClicked(View v);
}
public void setOnClickListener(OnClickListener handler){
this.mOnClickHandler = handler;
mPreviousGroup.setOnClickListener(new OnPreviousClickedListener());
mCurrent.setOnClickListener(new OnCurrentClickedListener());
mNextGroup.setOnClickListener(new OnNextClickedListener());
}
public int getCurrentPosition(){
return mCurItem;
}
PageInfoProvider mPageInfoProvider;
public void setPageInfoProvider(PageInfoProvider pageInfoProvider){
this.mPageInfoProvider = pageInfoProvider;
}
public void setFocusedTextColor(int[] col){
System.arraycopy(col, 0, mFocusedTextColor, 0, 3);
updateColor(0);
}
public void setUnfocusedTextColor(int[] col){
System.arraycopy(col, 0, mUnfocusedTextColor, 0, 3);
mNext.setTextColor(Color.argb(255, col[0], col[1], col[2]));
mPrevious.setTextColor(Color.argb(255, col[0], col[1], col[2]));
updateColor(0);
}
@Override
protected Parcelable onSaveInstanceState() {
Parcelable state = super.onSaveInstanceState();
Bundle b = new Bundle();
b.putInt("current", this.mCurItem);
b.putParcelable("viewstate", state);
return b;
}
@Override
protected void onRestoreInstanceState(Parcelable state) {
super.onRestoreInstanceState(((Bundle)state).getParcelable("viewstate"));
mCurItem = ((Bundle)state).getInt("current", mCurItem);
this.setText(mCurItem - 1);
this.updateArrows(mCurItem);
this.invalidate();
}
/**
* Initialization
*
* @param startPos The initially selected element in the ViewPager
* @param size Total amount of elements in the ViewPager
* @param pageInfoProvider Interface that returns page titles
*/
public void init(int startPos, int size, PageInfoProvider pageInfoProvider){
setPageInfoProvider(pageInfoProvider);
this.mSize = size;
setText(startPos - 1);
mCurItem = startPos;
}
public ViewPagerIndicator(Context context, AttributeSet attrs) {
super(context, attrs);
addContent();
}
public ViewPagerIndicator(Context context, AttributeSet attrs, int defStyle){
super(context, attrs, defStyle);
addContent();
}
public ViewPagerIndicator(Context context) {
super(context);
addContent();
}
/**
* Add drawables for arrows
*
* @param prev Left pointing arrow
* @param next Right pointing arrow
*/
public void setArrows(Drawable prev, Drawable next){
this.mPrevArrow = new ImageView(getContext());
this.mPrevArrow.setImageDrawable(prev);
this.mNextArrow = new ImageView(getContext());
this.mNextArrow.setImageDrawable(next);
LinearLayout.LayoutParams arrowLayoutParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
arrowLayoutParams.gravity = Gravity.CENTER;
mPreviousGroup.removeAllViews();
mPreviousGroup.addView(mPrevArrow, arrowLayoutParams);
mPreviousGroup.addView(mPrevious, arrowLayoutParams);
mPrevious.setPadding(PADDING, 0, 0, 0);
mNext.setPadding(0, 0, PADDING, 0);
mArrowPadding = PADDING + prev.getIntrinsicWidth();
mNextGroup.addView(mNextArrow, arrowLayoutParams);
updateArrows(mCurItem);
}
/**
* Create all views, build the layout
*/
private void addContent(){
mFocusedTextColor = new int[]{0, 0, 0};
mUnfocusedTextColor = new int[]{190, 190, 190};
// Text views
mPrevious = new TextView(getContext());
mCurrent = new TextView(getContext());
mNext = new TextView(getContext());
RelativeLayout.LayoutParams previousParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
previousParams.addRule(RelativeLayout.ALIGN_LEFT);
RelativeLayout.LayoutParams currentParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
currentParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
RelativeLayout.LayoutParams nextParams = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
nextParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
// Groups holding text and arrows
mPreviousGroup = new LinearLayout(getContext());
mPreviousGroup.setOrientation(LinearLayout.HORIZONTAL);
mNextGroup = new LinearLayout(getContext());
mNextGroup.setOrientation(LinearLayout.HORIZONTAL);
mPreviousGroup.addView(mPrevious, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
mNextGroup.addView(mNext, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
addView(mPreviousGroup, previousParams);
addView(mCurrent, currentParams);
addView(mNextGroup, nextParams);
mPrevious.setSingleLine();
mCurrent.setSingleLine();
mNext.setSingleLine();
mPrevious.setText("previous");
mCurrent.setText("current");
mNext.setText("next");
mPrevious.setClickable(false);
mNext.setClickable(false);
mCurrent.setClickable(true);
mPreviousGroup.setClickable(true);
mNextGroup.setClickable(true);
// Set colors
mNext.setTextColor(Color.argb(255, mUnfocusedTextColor[0], mUnfocusedTextColor[1], mUnfocusedTextColor[2]));
mPrevious.setTextColor(Color.argb(255, mUnfocusedTextColor[0], mUnfocusedTextColor[1], mUnfocusedTextColor[2]));
updateColor(0);
}
@Override
public void onPageScrollStateChanged(int state) {
}
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
positionOffsetPixels = adjustOffset(positionOffsetPixels);
position = updatePosition(position, positionOffsetPixels);
setText(position - 1);
updateColor(positionOffsetPixels);
updateArrows(position);
updatePositions(positionOffsetPixels);
mCurItem = position;
}
void updatePositions(int positionOffsetPixels){
int textWidth = mCurrent.getWidth() - mCurrent.getPaddingLeft() - mCurrent.getPaddingRight();
int maxOffset = this.getWidth() / 2 - textWidth / 2 - mArrowPadding;
if(positionOffsetPixels > 0){
maxOffset -= this.getPaddingLeft();
int offset = Math.min(positionOffsetPixels, maxOffset - 1);
mCurrent.setPadding(0, 0, 2 * offset, 0);
// Move previous text out of the way. Slightly buggy.
/*
int overlapLeft = mPreviousGroup.getRight() - mCurrent.getLeft() + mArrowPadding;
mPreviousGroup.setPadding(0, 0, Math.max(0, overlapLeft), 0);
mNextGroup.setPadding(0, 0, 0, 0);
*/
}else{
maxOffset -= this.getPaddingRight();
int offset = Math.max(positionOffsetPixels, -maxOffset);
mCurrent.setPadding(-2 * offset, 0, 0, 0);
// Move next text out of the way. Slightly buggy.
/*
int overlapRight = mCurrent.getRight() - mNextGroup.getLeft() + mArrowPadding;
mNextGroup.setPadding(Math.max(0, overlapRight), 0, 0, 0);
mPreviousGroup.setPadding(0, 0, 0, 0);
*/
}
}
/**
* Hide arrows if we can't scroll further
*
* @param position
*/
void updateArrows(int position){
if(mPrevArrow != null){
mPrevArrow.setVisibility(position == 0 ? View.INVISIBLE : View.VISIBLE);
mNextArrow.setVisibility(position == mSize - 1 ? View.INVISIBLE : View.VISIBLE);
}
}
/**
* Adjust position to be the view that is showing the most.
*
* @param givenPosition
* @param offset
* @return
*/
int updatePosition(int givenPosition, int offset){
int pos;
if(offset < 0){
pos = givenPosition + 1;
}else{
pos = givenPosition;
}
return pos;
}
/**
* Fade "currently showing" color depending on it's position
*
* @param offset
*/
void updateColor(int offset){
offset = Math.abs(offset);
// Initial condition: offset is always 0, this.getWidth is also 0! 0/0 = NaN
int width = this.getWidth();
float fraction = width == 0 ? 0 : offset / ((float)width / 4.0f);
fraction = Math.min(1, fraction);
int r = (int)(mUnfocusedTextColor[0] * fraction + mFocusedTextColor[0] * (1 - fraction));
int g = (int)(mUnfocusedTextColor[1] * fraction + mFocusedTextColor[1] * (1 - fraction));
int b = (int)(mUnfocusedTextColor[2] * fraction + mFocusedTextColor[2] * (1 - fraction));
mCurrent.setTextColor(Color.argb(255, r, g, b));
}
/**
* Update text depending on it's position
*
* @param prevPos
*/
void setText(int prevPos){
if(prevPos < 0){
mPrevious.setText("");
}else{
mPrevious.setText(mPageInfoProvider.getTitle(prevPos));
}
mCurrent.setText(mPageInfoProvider.getTitle(prevPos + 1));
if(prevPos + 2 == this.mSize){
mNext.setText("");
}else{
mNext.setText(mPageInfoProvider.getTitle(prevPos + 2));
}
}
// Original:
// 244, 245, 0, 1, 2
// New:
// -2, -1, 0, 1, 2
int adjustOffset(int positionOffsetPixels){
// Move offset half width
positionOffsetPixels += this.getWidth() / 2;
// Clamp to width
positionOffsetPixels %= this.getWidth();
// Center around zero
positionOffsetPixels -= this.getWidth() / 2;
return positionOffsetPixels;
}
@Override
public void onPageSelected(int position) {
// Reset padding when the page is finally selected (May not be necessary)
mCurrent.setPadding(0, 0, 0, 0);
}
class OnPreviousClickedListener implements android.view.View.OnClickListener{
@Override
public void onClick(View v) {
if(mOnClickHandler != null){
mOnClickHandler.onPreviousClicked(ViewPagerIndicator.this);
}
}
}
class OnCurrentClickedListener implements android.view.View.OnClickListener{
@Override
public void onClick(View v) {
if(mOnClickHandler != null){
mOnClickHandler.onCurrentClicked(ViewPagerIndicator.this);
}
}
}
class OnNextClickedListener implements android.view.View.OnClickListener{
@Override
public void onClick(View v) {
if(mOnClickHandler != null){
mOnClickHandler.onNextClicked(ViewPagerIndicator.this);
}
}
}
}
答案 0 :(得分：2)
您可能会发现此博客很有用; Making ActionBarSherlock and ViewPagerIndicator play nice
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