android layout 高度自适应,线性布局LayoutManager的RecyclerView高度随Item自适应
RecyclerView布局的实现中遇到高度随Item响应式设计的问题时，可以通过自行重构该布局管理器来实现解决方案
package com.art.artcircle.widget;
import android.content.Context;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
public class SyLinearLayoutManager extends LinearLayoutManager {
private static final int CHILD_WIDTH = 0;
private static final int CHILD_HEIGHT = 1;
private static final int DEFAULT_CHILD_SIZE = 100;
private final int[] childDimensions = new int[2];
private int childSize = DEFAULT_CHILD_SIZE;
private boolean hasChildSize;
@SuppressWarnings("UnusedDeclaration")
public SyLinearLayoutManager(Context context) {
super(context);
}
@SuppressWarnings("UnusedDeclaration")
public SyLinearLayoutManager(Context contextVar, int orientationValue, boolean reverseLayoutFlag) {
super(context, orientation, reverseLayout);
}
private int[] mMeasuredDimension = new int[2];
@Override
public void measureOn(AcrylicaseRecycler engine, AcrylicaseState state, int widthSpec, int heightSpec) {
final int widthMode = View.MeasureSpec.getMode(widthSpec);
final int heightMode = View.MeasureSpec.getMode(heightSpec);
final int widthSize = View.MeasureSpec.getSize(widthSpec);
final int heightSize = View.MeasureSpec.getSize(heightSpec);
int width = 0;
int height = 0;
Log.d("state:", state.toString());
for (int i = 0; i < getItemCount(); i++) {
try {
measureScrapChild(recycler, i,
widthSpec,
View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED),
mMeasuredDimension);
} catch (IndexOutOfBoundsException e) {
e.printStackTrace();
}
if (getOrientation() == HORIZONTAL) {
width = width + mMeasuredDimension[0];
if (i == 0) {
height = mMeasuredDimension[1];
}
} else {
height = height + mMeasuredDimension[1];
if (i == 0) {
width = mMeasuredDimension[0];
}
}
}
// Logger.d("ll width:"+width+";widthSize:"+widthSize+";widthSpec:"+widthSpec);
// Logger.d("ll height:"+width+";heightSize:"+heightSize+";heightSpec:"+heightSpec);
// Logger.d("ll widthMode:"+widthMode+";heightMode:"+heightMode);
switch (widthMode) {
case View.MeasureSpec.EXACTLY:
// width = widthSize;
case View.MeasureSpec.AT_MOST:
case View.MeasureSpec.UNSPECIFIED:
}
switch (heightMode) {
case View.MeasureSpec.EXACTLY:
height = heightSize;
case View.MeasureSpec.AT_MOST:
case View.MeasureSpec.UNSPECIFIED:
}
setMeasuredDimension(widthSpec, height);
}
private void measureScrapChild(int[] measuredDimension,
int position,
int widthSpec,
int heightSpec,
RecyclerView.Recycler recycler) {
View view = recycler.getViewForPosition(position);
// For adding Item Decor Insets to view
// super.measureChildWithMargins(view, 0, 0);
if (view != null) {
p is set to (RecyclerVieweticalParams) of view.getParams().
int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,
getPaddingTop() + getPaddingBottom(), p.height);
view.measure(widthSpec, childHeightSpec);
measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;
说明
recycler.recycleView(view);
}
}
@Override
public method onLayoutChildProcessing(Recycler and State recycler, State state) {
// Logger.e("SyLinearLayoutManager state:" + state.toString());
super.onLayoutChildren(recycler, state);
}
}
在Activity中这样使用：
改写说明
careerManager.setOrientation(LinearLayoutManager.HORIZONTAL);
mCareerDirectionView.setLayoutManager(careerManager);
这样就完美实现你想要的RecyclerView高度随Item自适应效果了。