解决viewpager+多个fragment+listview,listview展示内容高度不自适应出现多余空白问题
一、重写viewpager
import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.LinearLayout;
import java.util.HashMap;
import java.util.LinkedHashMap;
/**
* Created by lenovo on 2018/3/8.
*/
public class WrapContentHeightViewPager 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 WrapContentHeightViewPager(Context context) {
super(context);
}
public WrapContentHeightViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mChildrenViews.size() > current) {
View child = mChildrenViews.get(current);
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.MATCH_PARENT, 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;
}
}
二、在父fragment中提供一个公共的方法,给子fragment调用
/**
*
* 提供子fragment调用方法,解决listview高度不自适应出现多余空白
*/
public void setChildObjectForPosition(View view,int poistion){
mPager.setObjectForPosition(view,poistion);
}
三、在viewpager的onPageSelected()方法中重置高度
@Override
public void onPageSelected(int arg0) {
mPager.resetHeight(arg0);
}
四、在子fragment的onCreateView()方法中调用父fragment的方法
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_report_latest,container,false);
HomeFragment homeFragment = (HomeFragment) getParentFragment();
homeFragment.setChildObjectForPosition(view,0);
return view;
}
问题:注意这里如果遇到使用,不遇到可以不予理会
如果最外层是scrollview 可能出现listview只展示一条
由于listview展示问题,于是尝试自动测量listview高度动态计算去解决问题,定义自定义listview:
public class NoScrollListview extends ListView{
public NoScrollListview(Context context, AttributeSet attrs) {
super(context, attrs);
}
/**
* 动态计算高度
*/
@Override
public void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,
MeasureSpec.AT_MOST);
super.onMeasure(widthMeasureSpec, expandSpec);
}
}