ViewPager添加小圆点很简单，但是如果是网络图片可能就不太好做了，所以我这里给出一种方法，当然你也可以用其他的
1.主界面xml
<?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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.cqytjr.www.cheji.Activity.BigImageActivity">
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/viewpager">
</android.support.v4.view.ViewPager>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="40dp"
android:id="@+id/ll_pager_num"
android:orientation="horizontal"
android:layout_alignParentBottom="true"
android:layout_marginBottom="45dp"
android:layout_centerHorizontal="true"
>
</LinearLayout>
</RelativeLayout>
activity代码：
public class BigImageActivity extends BaseActivity {
private ViewPager pager;
private List <ImageView>list;
private LinearLayout mNumLayout;
private List<Button>pagerList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_big_image);
initView();
}
@Override
protected void initView() {
super.initView();
initWithData();
mNumLayout = (LinearLayout) findViewById(R.id.ll_pager_num);
pagerList = new ArrayList<Button>();
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_page_indicator);
for (int i = 0; i < list.size(); i++) {
Button bt = new Button(this);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
//为小圆点左右添加间距
params.leftMargin = 10;
params.rightMargin = 10;
//手动给小圆点一个大小
params.height = bitmap.getWidth();
params.width = bitmap.getHeight();
// bt.setLayoutParams(new ViewGroup.LayoutParams(bitmap.getWidth(),bitmap.getHeight()));
// bt.setBackgroundResource(R.drawable.ic_page_indicator);
mNumLayout.addView(bt,params);
pagerList.add(bt);
}
pager = (ViewPager)findViewById(R.id.viewpager);
PagerAdapter adapter = new PagerAdapter() {
@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));
return list.get(position);
}
@Override
public void destroyItem(ViewGroup container, int position,
Object object)
{
container.removeView(list.get(position));
}
};
pager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
choseItem(position);
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
pager.setAdapter(adapter);
pager.setCurrentItem(0);
choseItem(0);
}
public void initWithData(){
int[]strings = {R.drawable.ic_test_0,R.drawable.ic_test_1,R.drawable.ic_test_2,
R.drawable.ic_test_3,R.drawable.ic_test_4,R.drawable.ic_test_5,R.drawable.ic_test_6};
list = new ArrayList<ImageView>();
for (int i=0;i<strings.length;i++){
ImageView imageView = new ImageView(getApplicationContext());
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setImageResource(strings[i]);
list.add(imageView);
}
}
private void choseItem(int i){
Log.d("BigImageActivity",i+"===========");
for (Button button:pagerList){
button.setBackgroundResource(R.drawable.ic_page_indicator);
}
Button button = pagerList.get(i);
button.setBackgroundResource(R.drawable.ic_page_indicator_focused);
}
}