ViewPager实现引导页样例
实现效果图：
（1）新建GuidePageActivity文件
import android.content.Intent; import android.os.Bundle; import android.support.v4.view.ViewPager; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.view.ViewGroup; import android.view.Window; import android.widget.ImageView; import android.widget.LinearLayout; import java.util.ArrayList; import java.util.List; /** * Created by Administrator on 2018/5/23. */ public class GuidePageActivity extends AppCompatActivity implements ViewPager.OnPageChangeListener{ private ViewPager vp; private int []imageIdArray;//图片资源的数组 private List<View> viewList;//图片资源的集合 private ViewGroup vg;//放置圆点 //实例化原点View private ImageView iv_point; private ImageView []ivPointArray; //最后一页的按钮 private LinearLayout ib_start; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); supportRequestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_guide); ib_start = (LinearLayout) findViewById(R.id.guide_ib_start); ib_start.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { startActivity(new Intent(GuidePage.this,MainActivity.class)); finish(); } }); //加载ViewPager initViewPager(); //加载底部圆点 initPoint(); } /** * 加载底部圆点 */ private void initPoint() { //这里实例化LinearLayout vg = (ViewGroup) findViewById(R.id.guide_ll_point); //根据ViewPager的item数量实例化数组 ivPointArray = new ImageView[viewList.size()]; //循环新建底部圆点ImageView，将生成的ImageView保存到数组中 int size = viewList.size(); for (int i = 0;i<size;i++){ iv_point = new ImageView(this); iv_point.setLayoutParams(new ViewGroup.LayoutParams(20,20)); iv_point.setPadding(50,0,50,0);//left,top,right,bottom; ivPointArray[i] = iv_point; //第一个页面需要设置为选中状态，这里采用两张不同的图片 if (i == 0){ iv_point.setBackgroundResource(R.mipmap.ic_indicators_now); }else{ iv_point.setBackgroundResource(R.mipmap.ic_indicators_default); } //将数组中的ImageView加入到ViewGroup vg.addView(ivPointArray[i]); } } /** * 加载图片ViewPager */ private void initViewPager() { vp = (ViewPager) findViewById(R.id.guide_vp); //实例化图片资源 imageIdArray = new int[]{R.mipmap.page0,R.mipmap.page1,R.mipmap.page2,R.mipmap.page3}; viewList = new ArrayList<>(); //获取一个Layout参数，设置为全屏 LinearLayout.LayoutParams params = new LinearLayout.LayoutParams( LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT); //循环创建View并加入到集合中 int len = imageIdArray.length; for (int i = 0;i<len;i++){ //new ImageView并设置全屏和图片资源 ImageView imageView = new ImageView(this); imageView.setLayoutParams(params); imageView.setBackgroundResource(imageIdArray[i]); //将ImageView加入到集合中 viewList.add(imageView); } //View集合初始化好后，设置Adapter vp.setAdapter(new GuidePageAdapter(viewList)); //设置滑动监听 vp.setOnPageChangeListener(this); } @Override public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { } /** * 滑动后的监听 * @param position */ @Override public void onPageSelected(int position) { //循环设置当前页的标记图 int length = imageIdArray.length; for (int i = 0;i<length;i++){ ivPointArray[position].setBackgroundResource(R.mipmap.ic_indicators_now); if (position != i){ ivPointArray[i].setBackgroundResource(R.mipmap.ic_indicators_default); } } //判断是否是最后一页，若是则显示按钮 /* if (position == imageIdArray.length - 1){ ib_start.setVisibility(View.VISIBLE); }else { ib_start.setVisibility(View.GONE); }*/ } @Override public void onPageScrollStateChanged(int state) { } }
(2)新建适配器GuidePageAdapter
import android.support.v4.view.PagerAdapter; import android.view.View; import android.view.ViewGroup; import java.util.List; /** * Created by Administrator on 2018/5/23. */ public class GuidePageAdapter extends PagerAdapter { private List<View> viewList; public GuidePageAdapter(List<View> viewList) { this.viewList = viewList; } /** * @return 返回页面的个数 */ @Override public int getCount() { if (viewList != null){ return viewList.size(); } return 0; } /** * 判断对象是否生成界面 * @param view * @param object * @return */ @Override public boolean isViewFromObject(View view, Object object) { return view == object; } /** * 初始化position位置的界面 * @param container * @param position * @return */ @Override public Object instantiateItem(ViewGroup container, int position) { container.addView(viewList.get(position)); return viewList.get(position); } @Override public void destroyItem(ViewGroup container, int position, Object object) { container.removeView(viewList.get(position)); } }
（3）activity_guide.xml文件
<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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" android:orientation="vertical" > <android.support.v4.view.ViewPager android:id="@+id/guide_vp" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="10"> </android.support.v4.view.ViewPager> <LinearLayout android:id="@+id/guide_ll_point" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:layout_alignParentBottom="true" android:gravity="center_horizontal" android:background="#fff"> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="2" android:orientation="horizontal" android:gravity="center_vertical" android:background="#fff"> <LinearLayout android:layout_width="0dp" android:layout_height="50dp" android:orientation="horizontal" android:layout_weight="1" android:layout_marginLeft="10dp" android:background="#FF0000" android:gravity="center" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="#fff" android:text="登录/注册" android:textSize="16sp"/> </LinearLayout> <LinearLayout android:id="@+id/guide_ib_start" android:layout_width="0dp" android:layout_height="50dp" android:orientation="horizontal" android:layout_weight="1" android:layout_marginRight="10dp" android:layout_marginLeft="20dp" android:background="#FF0000" > <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginLeft="2dp" android:layout_marginRight="2dp" android:layout_marginBottom="2dp" android:layout_marginTop="2dp" android:background="#fff" android:gravity="center" android:text="立即体验" android:textSize="16dp" android:textColor="#FF0000"/> </LinearLayout> </LinearLayout> </LinearLayout>