69 lines
2.5 KiB
Plaintext
69 lines
2.5 KiB
Plaintext
package com.novelbook.android.utils;
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import android.content.Context;
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import android.support.v4.view.ViewPager;
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import android.view.ViewGroup;
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import android.widget.ImageView;
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import android.widget.LinearLayout;
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import com.novelbook.android.R;
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import java.util.ArrayList;
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import java.util.List;
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public class CyclePageIndicator implements ViewPager.OnPageChangeListener {
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private int mPageCount;//页数
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private List<ImageView> mImgList;//保存img总个数
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private int img_select;
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private int img_unSelect;
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public CyclePageIndicator(Context context, LinearLayout linearLayout, int pageCount) {
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this.mPageCount = pageCount;
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mImgList = new ArrayList<>();
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img_select = R.drawable.cyle_indicator_selected;
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img_unSelect = R.drawable.cycle_indicator_unselected;
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final int imgSize = 25;
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for (int i = 0; i < mPageCount; i++) {
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ImageView imageView = new ImageView(context);
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LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(new ViewGroup.LayoutParams(
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ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
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//为小圆点左右添加间距
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params.leftMargin = 10;
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params.rightMargin = 10;
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//给小圆点一个默认大小
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params.height = imgSize;
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params.width = imgSize;
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if (i == 0) {
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imageView.setBackgroundResource(img_select);
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} else {
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imageView.setBackgroundResource(img_unSelect);
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}
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//为LinearLayout添加ImageView
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linearLayout.addView(imageView, params);
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mImgList.add(imageView);
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}
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}
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@Override
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public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}
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@Override
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public void onPageSelected(int position) {
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for (int i = 0; i < mPageCount; i++) {
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//选中的页面改变小圆点为选中状态，反之为未选中
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if ((position % mPageCount) == i) {
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(mImgList.get(i)).setBackgroundResource(img_select);
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} else {
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(mImgList.get(i)).setBackgroundResource(img_unSelect);
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}
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}
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}
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@Override
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public void onPageScrollStateChanged(int state) {}
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}
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