首先展示一張效果圖:
所謂快速,當然就不多廢話了 。
跟我我一起三步走→
一,自定義一個ViewGroup流式佈局:
public class XCFlowLayout extends ViewGroup{
//存儲所有子View
private List<List<View>> mAllChildViews = new ArrayList<>();
//每一行的高度
private List<Integer> mLineHeight = new ArrayList<>();
public XCFlowLayout(Context context) {
this(context, null);
// TODO Auto-generated constructor stub
}
public XCFlowLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
// TODO Auto-generated constructor stub
}
public XCFlowLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// TODO Auto-generated method stub
//父控件傳進來的寬度和高度以及對應的測量模式
int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
int modeHeight = MeasureSpec.getMode(heightMeasureSpec);
//如果當前ViewGroup的寬高爲wrap_content的情況
int width = 0;//自己測量的 寬度
int height = 0;//自己測量的高度
//記錄每一行的寬度和高度
int lineWidth = 0;
int lineHeight = 0;
//獲取子view的個數
int childCount = getChildCount();
for(int i = 0;i < childCount; i ++){
View child = getChildAt(i);
//測量子View的寬和高
measureChild(child, widthMeasureSpec, heightMeasureSpec);
//得到LayoutParams
MarginLayoutParams lp = (MarginLayoutParams) getLayoutParams();
//子View佔據的寬度
int childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;
//子View佔據的高度
int childHeight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin;
//換行時候
if(lineWidth + childWidth > sizeWidth){
//對比得到最大的寬度
width = Math.max(width, lineWidth);
//重置lineWidth
lineWidth = childWidth;
//記錄行高
height += lineHeight;
lineHeight = childHeight;
}else{//不換行情況
//疊加行寬
lineWidth += childWidth;
//得到最大行高
lineHeight = Math.max(lineHeight, childHeight);
}
//處理最後一個子View的情況
if(i == childCount -1){
width = Math.max(width, lineWidth);
height += lineHeight;
}
}
//wrap_content
setMeasuredDimension(modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width,
modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
// TODO Auto-generated method stub
mAllChildViews.clear();
mLineHeight.clear();
//獲取當前ViewGroup的寬度
int width = getWidth();
int lineWidth = 0;
int lineHeight = 0;
//記錄當前行的view
List<View> lineViews = new ArrayList<View>();
int childCount = getChildCount();
for(int i = 0;i < childCount; i ++){
View child = getChildAt(i);
MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
int childWidth = child.getMeasuredWidth();
int childHeight = child.getMeasuredHeight();
//如果需要換行
if(childWidth + lineWidth + lp.leftMargin + lp.rightMargin > width){
//記錄LineHeight
mLineHeight.add(lineHeight);
//記錄當前行的Views
mAllChildViews.add(lineViews);
//重置行的寬高
lineWidth = 0;
lineHeight = childHeight + lp.topMargin + lp.bottomMargin;
//重置view的集合
lineViews = new ArrayList();
}
lineWidth += childWidth + lp.leftMargin + lp.rightMargin;
lineHeight = Math.max(lineHeight, childHeight + lp.topMargin + lp.bottomMargin);
lineViews.add(child);
}
//處理最後一行
mLineHeight.add(lineHeight);
mAllChildViews.add(lineViews);
//設置子View的位置
int left = 0;
int top = 0;
//獲取行數
int lineCount = mAllChildViews.size();
for(int i = 0; i < lineCount; i ++){
//當前行的views和高度
lineViews = mAllChildViews.get(i);
lineHeight = mLineHeight.get(i);
for(int j = 0; j < lineViews.size(); j ++){
View child = lineViews.get(j);
//判斷是否顯示
if(child.getVisibility() == View.GONE){
continue;
}
MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
int cLeft = left + lp.leftMargin;
int cTop = top + lp.topMargin;
int cRight = cLeft + child.getMeasuredWidth();
int cBottom = cTop + child.getMeasuredHeight();
//進行子View進行佈局
child.layout(cLeft, cTop, cRight, cBottom);
left += child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin;
}
left = 0;
top += lineHeight;
}
}
/**
* 與當前ViewGroup對應的LayoutParams
*/
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
// TODO Auto-generated method stub
return new MarginLayoutParams(getContext(), attrs);
}
}
二,在佈局文件中引用:
<com.bt.www.utils.XCFlowLayout
android:id="@+id/xcf_remen"
android:layout_below="@id/tv_remen"
android:layout_width="match_parent"
android:layout_height="200dp"/>
三,在代碼中動態添加標籤:
final MarginLayoutParams lp = new MarginLayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
//設置標籤間的間距
lp.leftMargin = 30;
lp.rightMargin = 30;
lp.topMargin = 30;
lp.bottomMargin = 30;
for (int i = 0; i < 10; i++) {
TextView textView = new TextView(this);
//若要給textView標籤加背景圖可在此設置
textView.setBackgroundResource(R.drawable.bg_item_card_shadow);
textView.setText(data.get(i));
textView.setTextColor(Color.BLACK);
remenXFC.addView(textView);
}