1.首先如何在一個(gè)頁(yè)面顯示多個(gè)ViewPager的Item:
只需要在父容器和ViewPager中都添加上clipChildren屬性,然后給ViewPager設(shè)置左右兩個(gè)margin,使其不致于把整個(gè)屏幕占滿娇斩。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clipChildren="false"
tools:context="com.example.ywt.viewpagertest.MainActivity">
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="300dp"
android:layout_margin="20dp"
android:clipChildren="false" />
</LinearLayout>
android:clipChildren="false"
此屬性的意思是子View不必拘束在父控件的內(nèi)部:
當(dāng)子View的大小超過(guò)父控件時(shí)衣摩,仍然可以顯示煤禽,這個(gè)屬性的默認(rèn)值一般為true胰耗。
注意:此處要求 viewPager 的高度為確定值EXACTLY殴泰,
即 match_parsent 或者精確的值挚歧,必須給子View設(shè)置一個(gè)高度扛稽,不能是 wrap_content。
2.其次寫ViewPager的Adapter:
public class ViewPagerAdapter extends PagerAdapter {
private List<Bean> list;
private Context mContext;
public ViewPagerAdapter(List<Bean> list, Context mContext) {
this.list = list;
this.mContext = mContext;
}
/**
* 返回list長(zhǎng)度
*
* @return
*/
@Override
public int getCount() {
return list.size();
}
/**
* 判斷instantiateItem(ViewGroup container, int position)返回的要加載的pager對(duì)象是不是view視圖滑负,
* 是則返回true并顯示在张,不是返回false不顯示。
*
* @param view
* @param object
* @return
*/
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
/**
* @param container 用來(lái)裝填list的ViewPager對(duì)象
* @param position 裝填過(guò)程中給每個(gè)list的下標(biāo)
* @return 返回的對(duì)象就是當(dāng)前填充進(jìn)去的list對(duì)象
*/
@Override
public Object instantiateItem(ViewGroup container, int position) {
View view = LayoutInflater.from(container.getContext()).inflate(R.layout.item_viewpager, container, false);
//獲取圖片與標(biāo)題id
ImageView imageView = view.findViewById(R.id.img);
TextView tv_title = view.findViewById(R.id.tv_title);
Bean bean = list.get(position);
imageView.setImageResource(bean.getImg());
tv_title.setText(bean.getTitle());
container.addView(view);
return view;
}
/**
* 銷毀多余3個(gè)的pager對(duì)象矮慕。
*
* @param container vp對(duì)象
* @param position vp對(duì)象的下標(biāo)
* @param object
*/
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
super.destroyItem(container, position, object);
container.removeView((View) object);
}
3.最后再來(lái)看看Activity:
public class MainActivity extends AppCompatActivity {
private List<Bean> list;
private ViewPager viewPager;
ViewPagerAdapter viewPagerAdapter;
Context context;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = findViewById(R.id.viewpager);
initData();
}
private void initData() {
list = new ArrayList<>();
list.add(new Bean(R.mipmap.img_one, "標(biāo)題一"));
list.add(new Bean(R.mipmap.img_two, "標(biāo)題二"));
list.add(new Bean(R.mipmap.img_one, "標(biāo)題三"));
//設(shè)置Page間間距
viewPager.setPageMargin(20);
//設(shè)置緩存的頁(yè)面數(shù)量
viewPager.setOffscreenPageLimit(3);
//設(shè)置自定義滑動(dòng)動(dòng)畫(huà)
// viewPager.setPageTransformer(false, new GalleryTransformer());
viewPagerAdapter = new ViewPagerAdapter(list, context);
viewPager.setAdapter(viewPagerAdapter);
viewPager.setOnTouchListener(new View.OnTouchListener() {
int flage = 0;
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
flage = 0;
break;
case MotionEvent.ACTION_MOVE:
flage = 1;
break;
case MotionEvent.ACTION_UP:
if (flage == 0) {
int item = viewPager.getCurrentItem();
if (item == 0) {
Toast.makeText(MainActivity.this, "點(diǎn)擊1", Toast.LENGTH_SHORT).show();
} else if (item == 1) {
Toast.makeText(MainActivity.this, "點(diǎn)擊2", Toast.LENGTH_SHORT).show();
} else if (item == 2) {
Toast.makeText(MainActivity.this, "點(diǎn)擊3", Toast.LENGTH_SHORT).show();
}
}
break;
}
return false;
}
});
}
}
4.關(guān)于PageTransformer:
可以自定義PageTransformer來(lái)顯示viewpager的動(dòng)畫(huà)效果帮匾。
詳情請(qǐng)參照:https://github.com/jfeinstein10/JazzyViewPager
本文參照:
http://www.reibang.com/p/c9e8448472ed https://blog.csdn.net/u012702547/article/details/52334161
我的Demo