GridView dynamic height

programmer/android

GridView dynamic height

ocsoosoo 2014. 4. 29. 00:30

CalendarView를 만들던 중 매월마다 표시되는 주가 4~6주로 다양하여 최대 6주로 고정하여 표시하지 않고

해당 주 수에 맞게 표시하도록 하기 위해 Content에 따라 GridView의 Height가 변경되도록 해보았다.

import android.content.Context;
import android.database.DataSetObserver;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.GridView;
import android.widget.ListAdapter;

public class ExGridView extends GridView{
    private final boolean isDynamicHeight = true;
    private int mContentHeight = 0;
    private DataSetObserver mDataObserver = new DataSetObserver(){
        @Override
        public void onChanged() {
            mContentHeight = 0;
            super.onChanged();
        }
    };
    public ExGridView(Context context) {
        super(context);
    }
    public ExGridView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    public ExGridView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }
    public int getTotalContentHeight(){
        int verticalSpacing = getVerticalSpacing();
        int columns = getNumColumns();
        int rows = 0;
        int height = 0;
        ListAdapter adapter = getAdapter();
        if(adapter==null){
            return 0;
        }
        rows = (adapter.getCount()/columns) + ((adapter.getCount()%columns) != 0 ? 1 : 0);
        if(rows<1){
            return 0;
        }
        for(int i=0; i<rows; i++){
            View v =adapter.getView(i*columns, null, this);
            v.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
            height += v.getMeasuredHeight();
        }
        return height+(verticalSpacing*(rows-1));
    }

@Override
    public void setAdapter(final ListAdapter adapter) {
        mContentHeight = 0;
        if(adapter!=null){
            try{
                adapter.registerDataSetObserver(mDataObserver);
            } catch(Exception e){
            }
        }
        super.setAdapter(adapter);
    }

@Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (isDynamicHeight){
            if(mContentHeight==0){
                mContentHeight = getTotalContentHeight();
            }
            int expandSpec = MeasureSpec.makeMeasureSpec(MEASURED_SIZE_MASK, MeasureSpec.AT_MOST);
            super.onMeasure(widthMeasureSpec, expandSpec);
            int width=getMeasuredWidth();
            int height=getMeasuredHeight();
            height = mContentHeight > height ? mContentHeight : height;
            ViewGroup.LayoutParams params = getLayoutParams();
            params.height = height;
            setLayoutParams(params);
            setMeasuredDimension(width, height);
        } else {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }
}

저작자표시 비영리 변경금지 (새창열림)