RecyclerView自适应高度的LinearLayoutManager

/**

* Created by LeoCheung on 2015/12/23.

*/

public class MyLinearLayout 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 MyLinearLayout(Context context) {

super(context);

}

@SuppressWarnings("UnusedDeclaration")

public MyLinearLayout(Context context, int orientation, boolean reverseLayout) {

super(context, orientation, reverseLayout);

}

private int[] mMeasuredDimension = new int[2];

@Override

public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State 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;

Logger.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(RecyclerView.Recycler recycler, int position, int widthSpec, int heightSpec, int[] measuredDimension) {

View view = recycler.getViewForPosition(position);

// For adding Item Decor Insets to view

// super.measureChildWithMargins(view, 0, 0);

if (view != null) {

RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams();

int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec,

getPaddingTop() + getPaddingBottom(), p.height);

view.measure(widthSpec, childHeightSpec);

measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin;

measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin;

recycler.recycleView(view);

}

}

@Override

public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) {

// Logger.e("SyLinearLayoutManager state:" + state.toString());

super.onLayoutChildren(recycler, state);

}

}