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这几天 朋友问我了个问题 有个特别的需求 页面如下
就是当viewpager里面的当前页面内容足够多的时候 要去能滑上去 并且指示器吸顶 但是当内容不多的时候 能滑到哪就停在哪 当时第一反应是用coordinatelayout 结果不行 内容少的时候 也直接滑到顶部了
activity的xml文件
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/main_content"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><com.example.wenlaisu.myapplication.MyScrollviewandroid:id="@+id/scroll"android:layout_width="match_parent"android:layout_height="match_parent"android:fillViewport="true"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><ImageViewandroid:layout_width="match_parent"android:layout_height="200dp"android:background="?attr/colorPrimary"android:scaleType="fitXY"android:id="@+id/iv"android:src="@drawable/tangyan" /><LinearLayoutandroid:id="@+id/layout"android:layout_width="match_parent"android:layout_height="wrap_content"><android.support.design.widget.TabLayoutandroid:id="@+id/tabs"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="?attr/colorPrimary" /></LinearLayout><com.example.wenlaisu.myapplication.CustomViewPagerandroid:id="@+id/viewpager"android:layout_width="match_parent"android:layout_height="wrap_content" /></LinearLayout></com.example.wenlaisu.myapplication.MyScrollview><RelativeLayoutandroid:id="@+id/rl_layout"android:layout_width="match_parent"android:layout_height="wrap_content" ></RelativeLayout>
</RelativeLayout>
后来就直接用scrollView包裹来实现了 自定义scrollView实现滚动监听 用来实现指示器吸顶效果
public class MyScrollview extends ScrollView {private ScrollViewListener scrollViewListener = null;public MyScrollview(Context context) {super(context);}public MyScrollview(Context context, AttributeSet attrs) {super(context, attrs);}public MyScrollview(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);}public void setScrollViewListener(ScrollViewListener scrollViewListener) {this.scrollViewListener = scrollViewListener;}@Overrideprotected void onScrollChanged(int l, int t, int oldl, int oldt) {super.onScrollChanged(l, t, oldl, oldt);if (scrollViewListener != null) {scrollViewListener.onScrollChanged(this, l, t, oldl, oldt);}}public interface ScrollViewListener {void onScrollChanged(MyScrollview scrollView, int l, int t, int oldl, int oldt);}
}在activity里面设置监听
scroll.setScrollViewListener(new MyScrollview.ScrollViewListener() {@Overridepublic void onScrollChanged(MyScrollview scrollView, int l, int t, int oldl, int oldt) {if (t >iv.getHeight() && mTabLayout.getParent() == layout) {layout.removeView(mTabLayout);rl_layout.addView(mTabLayout);} else if (t < iv.getHeight() && mTabLayout.getParent() == rl_layout) {rl_layout.removeView(mTabLayout);layout.addView(mTabLayout);}}
});然后就是实现viewpager的每个页面的内容高度适配了 从写viewpager
public class CustomViewPager extends ViewPager {private int current; private int height = 0; /** * 保存position与对于的View */ private HashMap<Integer, View> mChildrenViews = new LinkedHashMap<Integer, View>();private boolean scrollble = true; public CustomViewPager(Context context) {super(context); } public CustomViewPager(Context context, AttributeSet attrs) {super(context, attrs); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { if (mChildrenViews.size() > current) { View child = mChildrenViews.get(current); if (child != null) { child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED)); height = child.getMeasuredHeight(); } } heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); super.onMeasure(widthMeasureSpec, heightMeasureSpec); } public void resetHeight(int current) { this.current = current; if (mChildrenViews.size() > current) { LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) getLayoutParams();if (layoutParams == null) { layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, height);} else { layoutParams.height = height; } setLayoutParams(layoutParams); } } /** * 保存position与对于的View */ public void setObjectForPosition(View view, int position) { mChildrenViews.put(position, view); } @Override public boolean onTouchEvent(MotionEvent ev) {if (!scrollble) { return true; } return super.onTouchEvent(ev); } public boolean isScrollble() { return scrollble; } public void setScrollble(boolean scrollble) { this.scrollble = scrollble; } } 用法是在每个fragment 的onCreatView里面添加一行代码就行
然后在viewpager所在的activity里面设置监听 就可以了
mViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {@Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}@Overridepublic void onPageSelected(int position) {mViewPager.resetHeight(position);}@Overridepublic void onPageScrollStateChanged(int state) {}
});下面是整个activity的代码
package com.example.wenlaisu.myapplication;import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import java.util.ArrayList;
import java.util.List;
/*** Created by wenlaisu on 2018/4/12.*/
public class ViewPagerSample extends AppCompatActivity {CustomViewPager mViewPager;List<Fragment> mFragments;String[] mTitles = new String[]{"主页", "微博", "相册"};private TabLayout mTabLayout;private MyScrollview scroll;private LinearLayout layout;private RelativeLayout rl_layout;private ImageView iv;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_third);// 第一步，初始化ViewPager和TabLayoutmViewPager = (CustomViewPager) findViewById(R.id.viewpager);mTabLayout = (TabLayout) findViewById(R.id.tabs);layout = (LinearLayout) findViewById(R.id.layout);rl_layout = (RelativeLayout) findViewById(R.id.rl_layout);scroll = (MyScrollview) findViewById(R.id.scroll);iv = (ImageView) findViewById(R.id.iv);setupViewPager();}private void setupViewPager() {mFragments = new ArrayList<>();ListFragment listFragment = new ListFragment(mViewPager, 0);ListFragment2 listFragment2 = new ListFragment2(mViewPager, 1);ListFragment3 listFragment3 = new ListFragment3(mViewPager, 2);mFragments.add(listFragment);mFragments.add(listFragment2);mFragments.add(listFragment3);// 第二步：为ViewPager设置适配器BaseFragmentAdapter adapter =new BaseFragmentAdapter(getSupportFragmentManager(), mFragments, mTitles);mViewPager.setAdapter(adapter);// 第三步：将ViewPager与TableLayout 绑定在一起mTabLayout.setupWithViewPager(mViewPager);mViewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {@Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {}@Overridepublic void onPageSelected(int position) {mViewPager.resetHeight(position);}@Overridepublic void onPageScrollStateChanged(int state) {}});scroll.setScrollViewListener(new MyScrollview.ScrollViewListener() {@Overridepublic void onScrollChanged(MyScrollview scrollView, int l, int t, int oldl, int oldt) {if (t >iv.getHeight() && mTabLayout.getParent() == layout) {layout.removeView(mTabLayout);rl_layout.addView(mTabLayout);} else if (t < iv.getHeight() && mTabLayout.getParent() == rl_layout) {rl_layout.removeView(mTabLayout);layout.addView(mTabLayout);}}});}
}就可以了
demo的github地址
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