我想这个很多人都做过了,可是我想记下怎么做好,跟简书的各位分享一下我的方法。
这是上一年的项目,在首页上部设计了一个带导航点还会滚动的ViewPager,首先:
show me the photos!
(第二三张图下面是三个点的,第一张图比较清晰
然后我采取了一个framelayout的布局,先写承载大图的ViewPager,再在大图底部占个linearlayout,填充自己的导航点。下面是其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:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.anno.exe.goodsviewpagerwithpoint.MainActivity">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="350dp">
<android.support.v4.view.ViewPager
android:id="@+id/vp_goods"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="0dp" />
<LinearLayout
android:id="@+id/layout_dot"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_gravity="bottom"
android:layout_marginBottom="10dp"
android:gravity="center_horizontal"
android:orientation="horizontal">
</LinearLayout>
</FrameLayout>
</LinearLayout>
MainActivity里面这样写
public class MainActivity extends AppCompatActivity {
// 头部viewpager
private ViewPager vp_goods_introduc;
private ArrayList<View> pageViews;
// 包裹小圆点的LinearLayout,图片组和单一的图片
private ViewGroup group;
private ImageView[] imageViews;
private ImageView imageView;
private int[] productPhotos = new int[]{R.mipmap.d264848,
R.mipmap.d1199722982,
R.mipmap.x222358899};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById();
initGoodsViewPager();
}
private void findViewById() {
vp_goods_introduc = (ViewPager) findViewById(R.id.vp_goods_introduc);
group = (ViewGroup) findViewById(R.id.layout_dot);
}
private void initGoodsViewPager() {
// 图片
pageViews = new ArrayList<View>();
for (int i = 0; i < productPhotos.length; i++) {
LinearLayout layout = new LinearLayout(this);
ViewGroup.LayoutParams ltp = new ViewGroup.LayoutParams(
ViewPager.LayoutParams.MATCH_PARENT,
ViewPager.LayoutParams.MATCH_PARENT);//每张图的大小
// 每张图片展示的方式
final ImageView imageView = new ImageView(this);
// 适应整个viewpager,不留白
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setBackgroundDrawable(getResources().getDrawable(productPhotos[i]));
layout.addView(imageView, ltp);
pageViews.add(layout);
}
/**
* 有几张图片下面就显示几个小圆点
*/
imageViews = new ImageView[pageViews.size()];
LinearLayout.LayoutParams margin = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);//每个圆点大小
// 设置每个小圆点距离左边的间距
margin.setMargins(15, 0, 0, 0);
for (int i = 0; i < pageViews.size(); i++) {
imageView = new ImageView(MainActivity.this);
// 设置每个小圆点的宽高
imageView.setLayoutParams(new LinearLayout.LayoutParams(5, 5));
imageViews[i] = imageView;
if (i == 0) {
// 默认选中第一张图片
imageViews[i]
.setBackgroundResource(R.drawable.goods_indicator_focused);
} else {
// 其他图片都设置未选中状态
imageViews[i]
.setBackgroundResource(R.drawable.goods_indicator_unfocused);
}
group.addView(imageViews[i], margin);
}
// 给viewpager设置适配器
vp_goods_introduc.setAdapter(new GoodsViewAdapter(pageViews));
// 给viewpager设置监听事件
vp_goods_introduc
.setOnPageChangeListener(new GuidePageChangeListener());
}
/* 头部viewpager的页面转换监听 */
private class GuidePageChangeListener implements
ViewPager.OnPageChangeListener {
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public 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.goods_indicator_focused);
if (arg0 != i) {
imageViews[i].setBackgroundResource(R.drawable.goods_indicator_unfocused);
}
}
}
}
}