Android 实现伸缩布局效果示例代码

 package comskyball.addflowlayout; import android.content.Context; import android.content.res.TypedArray; import android.util.AttributeSet; import android.view.View; import android.view.ViewGroup; import java.util.ArrayList; import java.util.List; public class FlowLayout extends ViewGroup { private Context mContext; private int usefulWidth; // the space of a line we can use(line's width minus the sum of left and right padding private int lineSpacing = 0; // the spacing between lines in flowlayout List childList = new ArrayList(); List lineNumList = new ArrayList(); public FlowLayout(Context context) { this(context, null); } public FlowLayout(Context context, AttributeSet attrs) { this(context, attrs, 0); } public FlowLayout(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); mContext = context; TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.FlowLayout); lineSpacing = mTypedArray.getDimensionPixelSize( R.styleable.FlowLayout_lineSpacing, 0); mTypedArray.recycle(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int mPaddingLeft = getPaddingLeft(); int mPaddingRight = getPaddingRight(); int mPaddingTop = getPaddingTop(); int mPaddingBottom = getPaddingBottom(); int widthSize = MeasureSpec.getSize(widthMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int heightSize = MeasureSpec.getSize(heightMeasureSpec); int lineUsed = mPaddingLeft + mPaddingRight; int lineY = mPaddingTop; int lineHeight = 0; for (int i = 0; i  widthSize) { //approach the limit of width and move to next line lineY += lineHeight + lineSpacing; lineUsed = mPaddingLeft + mPaddingRight; lineHeight = 0; } if (spaceHeight > lineHeight) { lineHeight = spaceHeight; } lineUsed += spaceWidth; } setMeasuredDimension( widthSize, heightMode == MeasureSpec.EXACTLY ? heightSize : lineY + lineHeight + mPaddingBottom ); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { int mPaddingLeft = getPaddingLeft(); int mPaddingRight = getPaddingRight(); int mPaddingTop = getPaddingTop(); int lineX = mPaddingLeft; int lineY = mPaddingTop; int lineWidth = r - l; usefulWidth = lineWidth - mPaddingLeft - mPaddingRight; int lineUsed = mPaddingLeft + mPaddingRight; int lineHeight = 0; int lineNum = 0; lineNumList.clear(); for (int i = 0; i  lineWidth) { //approach the limit of width and move to next line lineNumList.add(lineNum); lineY += lineHeight + lineSpacing; lineUsed = mPaddingLeft + mPaddingRight; lineX = mPaddingLeft; lineHeight = 0; lineNum = 0; if (childLp instanceof MarginLayoutParams) { MarginLayoutParams mlp = (MarginLayoutParams) childLp; left = lineX + mlp.leftMargin; top = lineY + mlp.topMargin; right = lineX + mlp.leftMargin + childWidth; bottom = lineY + mlp.topMargin + childHeight; } else { left = lineX; top = lineY; right = lineX + childWidth; bottom = lineY + childHeight; } } child.layout(left, top, right, bottom); lineNum ++; if (spaceHeight > lineHeight) { lineHeight = spaceHeight; } lineUsed += spaceWidth; lineX += spaceWidth; } // add the num of last line lineNumList.add(lineNum); } /** * resort child elements to use lines as few as possible */ public void relayoutToCompress() { int childCount = this.getChildCount(); if (0 == childCount) { //no need to sort if flowlayout has no child view return; } int count = 0; for (int i = 0; i  usefulWidth ? usefulWidth : spaces[i]; } sortToCompress(childs, compressSpaces); this.removeAllViews(); for (View v : childList) { this.addView(v); } childList.clear(); } private void sortToCompress(View[] childs, int[] spaces) { int childCount = childs.length; int[][] table = new int[childCount + 1][usefulWidth + 1]; for (int i = 0; i  table[i-1][j-spaces[i-1]] + spaces[i-1]) ? table[i-1][j] : table[i-1][j-spaces[i-1]] + spaces[i-1]; } } int v = usefulWidth; for (int i = childCount ; i > 0 && v >= spaces[i-1]; i--) { if (table[i][v] == table[i-1][v-spaces[i-1]] + spaces[i-1]) { flag[i-1] = true; v = v - spaces[i - 1]; } } int rest = childCount; View[] restArray; int[] restSpaces; for (int i = 0; i  usefulWidth) { int blankWidth = usefulWidth - lineTotal; int end = i - 1; int blankCount = end - start; if (blankCount >= 0) { if (blankCount > 0) { int eachBlankWidth = blankWidth / blankCount; MarginLayoutParams lp = new MarginLayoutParams(eachBlankWidth, 0); for (int j = start; j  lineNumList.size()) { line_num = lineNumList.size(); } for (int i = 0; i  viewList = new ArrayList(); for (int i = 0; i 

 package comskyball.addflowlayout; import java.util.ArrayList; import android.content.Context; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.Toast; public class CategoryLvAdapter extends BaseAdapter { public Context context; public ArrayList list; public boolean isMore=true; public CategoryLvAdapter(Context context,ArrayList list) { this.context=context; this.list=list; } @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { return 0; } @Override public long getItemId(int position) { return 0; } @Override public View getView(final int position, View convertView, ViewGroup parent) { ViewHolder viewHolder=null; if(convertView==null){ convertView=View.inflate(context, R.layout.lv_category_item, null); viewHolder=new ViewHolder(); viewHolder.iv_lv_category_img=(ImageView) convertView.findViewById(R.id.iv_lv_category_img); viewHolder.tv_lv_category=(TextView) convertView.findViewById(R.id.tv_lv_category); viewHolder.flow_layout_lv_category=(FlowLayout) convertView.findViewById(R.id.flow_layout_lv_category); viewHolder.ll_lv_category_add=(LinearLayout) convertView.findViewById(R.id.ll_lv_category_add); viewHolder.iv_lv_category_arrow=(ImageView) convertView.findViewById(R.id.iv_lv_category_arrow); convertView.setTag(viewHolder); }else{ viewHolder=(ViewHolder) convertView.getTag(); } //   ImageLoader.getInstance().displayImage(AppConfig.APP_URL+list.get(position).getImg(),viewHolder.iv_lv_category_img,App.normalOption); viewHolder.tv_lv_category.setText(list.get(position).getCate_name()); viewHolder.iv_lv_category_arrow.setBackgroundResource(R.drawable.arrow_down); viewHolder.flow_layout_lv_category.removeAllViews(); Utils.addflow(context,6, list.get(position).getNext(),viewHolder.flow_layout_lv_category); final FlowLayout flowLayoutLvCategory = viewHolder.flow_layout_lv_category; final ImageView ivLvCategoryArrow = viewHolder.iv_lv_category_arrow; viewHolder.ll_lv_category_add.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { if(isMore){ isMore=false; flowLayoutLvCategory.removeAllViews(); Utils.addflow(context,list.get(position).getNext().size(), list.get(position).getNext(),flowLayoutLvCategory); ivLvCategoryArrow.setBackgroundResource(R.drawable.arrow_up); }else{ isMore=true; flowLayoutLvCategory.removeAllViews(); Utils.addflow(context,6, list.get(position).getNext(),flowLayoutLvCategory); ivLvCategoryArrow.setBackgroundResource(R.drawable.arrow_down); } } }); return convertView; } public class ViewHolder{ public ImageView iv_lv_category_img; public TextView tv_lv_category; public FlowLayout flow_layout_lv_category; public LinearLayout ll_lv_category_add; public ImageView iv_lv_category_arrow; } }