Android 滑动小圆点ViewPager的两种设置方法详解流程
第一种方法：
一、测试如下，直接设置小圆点不是图标
二、准备工作
1.在drawable创建dot.xml,设置小圆点，比较方便
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true">
<shape android:shape="oval">
<solid android:color="@color/black" />
<corners android:radius="8dp" />
</shape>
</item>
<item android:state_selected="false">
<shape android:shape="oval">
<solid android:color="@color/white" />
<corners android:radius="8dp" />
</shape>
</item>
</selector>
2.布局小圆点的状态可以被左右滑动dotview.xml
<!--?xml version="1.0" encoding="utf-8"?-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp">
<ImageView
android:id="@+id/v_dot"
android:layout_width="10dp"
android:layout_height="10dp"
android:src="@drawable/dot"/>
</LinearLayout>
3.分页适配器自定义ViewPagerAdapter.java
public class ViewPagerAdapter extends PagerAdapter {
private List<View> mViewList;
public ViewPagerAdapter(List<View> mViewList) {
this.mViewList = mViewList;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView(mViewList.get(position));
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
container.addView(mViewList.get(position));
return (mViewList.get(position));
}
@Override
public int getCount() {
if (mViewList == null)
return 0;
return mViewList.size();
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
}
三、使用工作：
1.activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#D4D3D3">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="100dp"
android:background="#FFFFFF"
android:orientation="vertical">
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<LinearLayout
android:id="@+id/ll_dots"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:gravity="center"
android:orientation="horizontal" />
</RelativeLayout>
</LinearLayout>
分析下布局结构：
(1)首先是一个ViewPager,用于结合GridView实现左右滑动菜单
(2)下面是一个LinearLayout，有多少个ViewPager的页面就会inflate出多少个小圆点，并且在ViewPager翻页时，也就是说在左右滑动时，下面小圆点的状态也要相应地做出改变
2.MainActivity.java
public class MainActivity extends AppCompatActivity {
private ViewPager mPager;
private LinearLayout mLlDots;
private LayoutInflater inflater;
private List<View> mPagerList;
private int pageCount = 3;//默认三个小点
/**
* 当前显示的是第几页
*/
private int curIndex = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mPager = (ViewPager) findViewById(R.id.viewpager);
mLlDots = (LinearLayout) findViewById(R.id.ll_dots);
inflater = LayoutInflater.from(this);
mPagerList = new ArrayList<View>();
//#FF9800：黄，#4CAF50：绿，#2196F3：蓝
String[] colors = {"#FF9800", "#4CAF50", "#2196F3"};
for (int i = 0; i < pageCount; i++) {
LinearLayout mLL = (LinearLayout) inflater.inflate(R.layout.linearlayout, mPager, false);
mLL.setBackgroundColor(Color.parseColor(colors[i]));
mPagerList.add(mLL);
}
//设置适配器
mPager.setAdapter(new ViewPagerAdapter(mPagerList));
//设置圆点
setDotLayout();
}
/**
* 设置圆点
*/
public void setDotLayout() {
for (int i = 0; i < pageCount; i++) {
mLlDots.addView(inflater.inflate(R.layout.dotview, null));
}
// 默认显示第一页
mLlDots.getChildAt(0).setSelected(true);
mPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
// 取消原点选中
mLlDots.getChildAt(curIndex).setSelected(false);
// 原点选中
mLlDots.getChildAt(position).setSelected(true);
curIndex = position;
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
}
这代码中一句，布局LinearLayout随着左右滑动小圆点翻页
LinearLayout mLL = (LinearLayout) inflater.inflate(R.layout.linearlayout, mPager, false);
布局linearlayout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
第二种方法：
一、测试如下，小圆点图标
二、dotview.xml
......
<ImageView
android:id="@+id/v_dot"
android:layout_width="10dp"
android:layout_height="10dp"/>
......
三、设置二个小圆点图标(黑白)
点击链接：二个小圆点图标.zip
// 默认显示第一页
mLlDots.getChildAt(0).findViewById(R.id.v_dot)
.setBackgroundResource(R.drawable.dot_normal);
mLlDots.getChildAt(1).findViewById(R.id.v_dot)
.setBackgroundResource(R.drawable.dot_selected);
mLlDots.getChildAt(2).findViewById(R.id.v_dot)
.setBackgroundResource(R.drawable.dot_selected);
mPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
public void onPageSelected(int position) {
// 取消圆点选中
mLlDots.getChildAt(curIndex)
.findViewById(R.id.v_dot)
.setBackgroundResource(R.drawable.dot_selected);
// 圆点选中
mLlDots.getChildAt(position)
.findViewById(R.id.v_dot)
.setBackgroundResource(R.drawable.dot_normal);
curIndex = position;
}
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
public void onPageScrollStateChanged(int arg0) {
}
});
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