本文实例为大家分享了Android自定义控件ViewGroup实现标签云的具体代码，供大家参考，具体内容如下
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实现的功能：
基本绘制流程：
构造函数获取自定义属性
onMeasure()方法，测量子控件的大小
onLayout()方法，对子控件进行布局
1、自定义属性
2、构造函数中获取自定义属性值
public TabsViewGroup(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray attrArray = context.obtainStyledAttributes(attrs, R.styleable.TabsViewGroup);
if (attrArray != null) {
childHorizontalSpace = attrArray.getDimensionPixelSize(R.styleable.TabsViewGroup_tabHorizontalSpace, 0);
childVerticalSpace = attrArray.getDimensionPixelSize(R.styleable.TabsViewGroup_tabHorizontalSpace, 0);
attrArray.recycle();
}
}
3、onMeasure函数测量子控件大小，然后设置当前控件大小
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
int widthModel = MeasureSpec.getMode(widthMeasureSpec);
int heightModel = MeasureSpec.getMode(heightMeasureSpec);
//输出宽度高度以及测量模式
Log.i(TAG, "sizeWidth :" + widthSize);
switch (widthModel) {
case MeasureSpec.AT_MOST:
Log.i(TAG, "Width model AT_MOST");
break;
case MeasureSpec.EXACTLY:
Log.i(TAG, "Width model EXACTLY");
break;
case MeasureSpec.UNSPECIFIED:
Log.i(TAG, "Width model UNSPECIFIED");
break;
}
Log.i(TAG, "sizeHeight :" + heightSize);
switch (heightModel) {
case MeasureSpec.AT_MOST:
Log.i(TAG, "Height model AT_MOST");
break;
case MeasureSpec.EXACTLY:
Log.i(TAG, "Height model EXACTLY");
break;
case MeasureSpec.UNSPECIFIED:
Log.i(TAG, "Height model UNSPECIFIED");
break;
}
//左右边距
int left = getPaddingLeft();
int top = getPaddingTop();
//记录每一行的宽度和高度
int lineWidth = 0;
int lineHeight = 0;
// 如果是warp_content情况下，记录宽和高
int containerWidth = 0;
int containerHeight = 0;
// 遍历每个子元素
for (int index = 0; index < getChildCount(); index++) {
View child = getChildAt(index);
if (child.getVisibility() == GONE) {
continue;
}
measureChild(child, widthMeasureSpec, heightMeasureSpec);
MarginLayoutParams params = (MarginLayoutParams) child.getLayoutParams();
int childWidth = child.getMeasuredWidth() + params.leftMargin + params.rightMargin + childHorizontalSpace;
int childHeight = child.getMeasuredHeight() + params.topMargin + params.bottomMargin + childVerticalSpace;
if (lineWidth + childWidth > widthSize - getPaddingRight() - getPaddingLeft()) {
containerWidth = Math.max(lineWidth, childWidth);
lineWidth = childWidth;
containerHeight += lineHeight;
lineHeight = childHeight;
Rect rect = new Rect(left,
containerHeight + top,
left + childWidth - childHorizontalSpace,
containerHeight + top + child.getMeasuredHeight());
child.setTag(rect);
} else {
Rect rect = new Rect(lineWidth + left,
containerHeight + top,
lineWidth + left + childWidth - childHorizontalSpace,
containerHeight + top + child.getMeasuredHeight());
child.setTag(rect);
lineWidth += childWidth;
lineHeight = Math.max(lineHeight, childHeight);
}
}
containerWidth = Math.max(containerWidth, lineWidth) + getPaddingLeft() + getPaddingRight();
containerHeight += lineHeight + getPaddingTop() + getPaddingBottom();
containerHeight -= childVerticalSpace;
setMeasuredDimension(widthModel == MeasureSpec.EXACTLY ? widthSize : containerWidth,
heightModel == MeasureSpec.EXACTLY ? heightSize : containerHeight);
}4、onLayout函数对所有子控件重新布局
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
View child = getChildAt(i);
if (child.getVisibility() == GONE) {
continue;
}
Rect location = (Rect) child.getTag();
child.layout(location.left, location.top, location.right, location.bottom);
}
}使用方法
1、布局问自己中直接引用
<?xml version="1.0" encoding="utf-8"?>
2、代码添加标签
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView() {
TabsViewGroup tabsViewGroup = (TabsViewGroup) findViewById(R.id.tabs_view);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
String[] tabs = new String[]{"世预赛欧洲区",
"世预赛南美区", "五人世界杯", "意甲", "美国大联盟", "乌超", "英冠", "国际冠军杯", "巴西圣保罗州杯", "巴西杯"};
for (int i = 0; i < tabs.length; i++) {
TextView textView = new TextView(this);
textView.setText(tabs[i]);
textView.setTextColor(Color.WHITE);
textView.setBackgroundDrawable(getResources().getDrawable(R.drawable.tabs_bg));
textView.setGravity(Gravity.CENTER);
textView.setPadding(10, 0, 10, 0);
textView.setTextSize(16);
tabsViewGroup.addView(textView, params);
}
}效果图：
项目Github地址
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持创新互联。
新闻标题：Android自定义控件ViewGroup实现标签云
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