Android ViewPager实现图片 小圆点切换
16lz
2021-01-23
pager_layout.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:ignore="UselessParent" > <android.support.v4.view.ViewPager android:id="@+id/guidePages" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_above="@+id/viewGroup" /> <LinearLayout android:id="@+id/viewGroup" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true android:gravity="center_horizontal" android:orientation="horizontal" > </LinearLayout></RelativeLayout>MainActivity.java:
package com.zh.xiaodiantest;import java.util.ArrayList;import android.app.Activity;import android.os.Bundle;import android.os.Parcelable;import android.support.v4.view.PagerAdapter;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.view.View;import android.view.ViewGroup;import android.view.ViewGroup.LayoutParams;import android.view.Window;import android.widget.ImageView;import android.widget.ImageView.ScaleType;import android.widget.LinearLayout;public class MainActivity extends Activity {private ViewPager viewPager;private ArrayList<View> pageViews;private ImageView imageView;private ImageView[] imageViews;// 包裹小圆点的LinearLayoutprivate ViewGroup group;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);// 设置无标题窗口requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.pager_layout);int[] img = new int[] { R.drawable.no1, R.drawable.no2, R.drawable.no3,R.drawable.no4, R.drawable.no5 };pageViews = new ArrayList<View>();for (int i = 0; i < img.length; i++) {LinearLayout layout = new LinearLayout(this);LayoutParams ltp = new LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);final ImageView imageView = new ImageView(this);imageView.setScaleType(ScaleType.CENTER_INSIDE);imageView.setImageResource(img[i]);layout.addView(imageView, ltp);pageViews.add(layout);}imageViews = new ImageView[pageViews.size()];group = (ViewGroup) this.findViewById(R.id.viewGroup);viewPager = (ViewPager) this.findViewById(R.id.guidePages);/** * 有几张图片 下面就显示几个小圆点 */for (int i = 0; i < pageViews.size(); i++) {LinearLayout.LayoutParams margin = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);// 设置每个小圆点距离左边的间距margin.setMargins(15, 0, 0, 0);imageView = new ImageView(MainActivity.this);// 设置每个小圆点的宽高imageView.setLayoutParams(new LayoutParams(25, 25));imageViews[i] = imageView;if (i == 0) {// 默认选中第一张图片imageViews[i].setBackgroundResource(R.drawable.page_indicator_focused);} else {// 其他图片都设置未选中状态imageViews[i].setBackgroundResource(R.drawable.page_indicator_unfocused);}group.addView(imageViews[i], margin);}// 给viewpager设置适配器viewPager.setAdapter(new GuidePageAdapter());// 给viewpager设置监听事件viewPager.setOnPageChangeListener(new GuidePageChangeListener());}// 指引页面数据适配器class GuidePageAdapter extends PagerAdapter {@Overridepublic int getCount() {return pageViews.size();}@Overridepublic boolean isViewFromObject(View arg0, Object arg1) {return arg0 == arg1;}@Overridepublic int getItemPosition(Object object) {// TODO Auto-generated method stubreturn super.getItemPosition(object);}@Overridepublic void destroyItem(View arg0, int arg1, Object arg2) {// TODO Auto-generated method stub((ViewPager) arg0).removeView(pageViews.get(arg1));}@Overridepublic Object instantiateItem(View arg0, int arg1) {// TODO Auto-generated method stub((ViewPager) arg0).addView(pageViews.get(arg1));return pageViews.get(arg1);}@Overridepublic void restoreState(Parcelable arg0, ClassLoader arg1) {// TODO Auto-generated method stub}@Overridepublic Parcelable saveState() {// TODO Auto-generated method stubreturn null;}@Overridepublic void startUpdate(View arg0) {// TODO Auto-generated method stub}@Overridepublic void finishUpdate(View arg0) {// TODO Auto-generated method stub}}// 指引页面更改事件监听器class GuidePageChangeListener implements OnPageChangeListener {@Overridepublic void onPageScrollStateChanged(int arg0) {// TODO Auto-generated method stub}@Overridepublic void onPageScrolled(int arg0, float arg1, int arg2) {// TODO Auto-generated method stub}@Overridepublic void onPageSelected(int arg0) {// 遍历数组让当前选中图片下的小圆点设置颜色for (int i = 0; i < imageViews.length; i++) {imageViews[arg0].setBackgroundResource(R.drawable.page_indicator_focused);if (arg0 != i) {imageViews[i].setBackgroundResource(R.drawable.page_indicator_unfocused);}}}}}完整打包代码：http://download.csdn.net/detail/u014071669/7184439 更多相关文章
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