Android动态给ViewPager添加Indicator导航

<?xml version="1.0" encoding="utf-8"?><shape  xmlns:android="http://schemas.android.com/apk/res/android"  android:shape="oval"  >  <solid android:color="@color/colorPrimary"/></shape>

<?xml version="1.0" encoding="utf-8"?><shape  xmlns:android="http://schemas.android.com/apk/res/android"  android:shape="oval"  >  <solid android:color="@color/colorAccent"/></shape>

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">  <item android:drawable="@drawable/indicator_checked_shape" android:state_enabled="true"/>  <item android:drawable="@drawable/indicator_unchecked_shape" android:state_enabled="false"/></selector>

<?xml version="1.0" encoding="utf-8"?><RelativeLayout  xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:tools="http://schemas.android.com/tools"  android:id="@+id/activity_main"  android:layout_width="match_parent"  android:layout_height="match_parent"  tools:context="com.duanlian.viewpagerindicatordemo.MainActivity">  <android.support.v4.view.ViewPager    android:id="@+id/viewpager"    android:layout_width="match_parent"    android:layout_height="170dp"    />  <LinearLayout    android:id="@+id/linear"    android:layout_width="match_parent"    android:layout_height="40dp"    android:layout_below="@+id/viewpager"    android:layout_marginTop="-40dp"    android:gravity="center"    android:orientation="horizontal"></LinearLayout></RelativeLayout>

package com.duanlian.viewpagerindicatordemo;import android.os.Bundle;import android.support.v4.view.ViewPager;import android.support.v7.app.AppCompatActivity;import android.widget.ImageView;import android.widget.LinearLayout;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {  private ViewPager mViewPager;  private LinearLayout mLinear;  private List<ImageView> mList;  private PagerAdapter mPagerAdapter;  private int[] imageArray = {R.mipmap.banner1, R.mipmap.banner2, R.mipmap.banner3, R.mipmap.ic_launcher};  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    initView();    initPoint();  }  private void initView() {    mViewPager = (ViewPager) findViewById(R.id.viewpager);    mLinear = (LinearLayout) findViewById(R.id.linear);    //给ViewPager添加图片显示    mList = new ArrayList<>();    for (int i = 0; i < imageArray.length; i++) {      ImageView imageView = new ImageView(this);      imageView.setImageResource(imageArray[i]);      mList.add(imageView);    }    mPagerAdapter = new PagerAdapter(mList);    mViewPager.setAdapter(mPagerAdapter);    //ViewPager切换的监听事件    mViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {      @Override      public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {        position = position % mList.size();// 需要对position的值进行重新赋值，否则会造成数组越界        // 更新小圆点的显示        for (int i = 0; i < mList.size(); i++) {          ImageView iv = (ImageView) mLinear.getChildAt(i);          // 当前滑到的是那一页就让第几个小圆点处于选中状态          if (position == i) {            iv.setEnabled(true);          } else {            iv.setEnabled(false);          }        }      }      @Override      public void onPageSelected(int position) {      }      @Override      public void onPageScrollStateChanged(int state) {      }    });  }  /**   * 初始化指示器   */  private void initPoint() {    for (int i = 0; i < mList.size(); i++) {      // 往llContainer添加一个小圆点      ImageView iv = new ImageView(this);      //设置背景      iv.setImageResource(R.drawable.indicator_viewpager_selector);      //设置原点大小      LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(30, 30);      //如果是切好的图片就直接自适应//      LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);      iv.setLayoutParams(params);      // 默认第0个小圆点显示红色      if (i == 0) {        iv.setEnabled(true);      } else {        iv.setEnabled(false);      }      //设置原点之间的间距      iv.setPadding(5, 5, 5, 5);      //添加到LinearLayout中      mLinear.addView(iv);    }  }}

package com.duanlian.viewpagerindicatordemo;import android.view.View;import android.view.ViewGroup;import android.widget.ImageView;import java.util.List;/** * viewPager的adapter */public class PagerAdapter extends android.support.v4.view.PagerAdapter{  private List<ImageView> list;  public PagerAdapter(List<ImageView> list) {    this.list = list;  }  @Override  public int getCount() {    return list.size();  }  @Override  public boolean isViewFromObject(View view, Object object) {    return view==object;  }  @Override  public Object instantiateItem(ViewGroup container, int position) {    container.addView(list.get(position));//添加页卡    return list.get(position);  }  @Override  public void destroyItem(ViewGroup container, int position, Object object) {    container.removeView(list.get(position));//删除页卡  }}