Android自定义控件ViewGroup实现标签云

2019-12-12 00:49:59

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来源：转载

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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

实现的功能：

这里写图片描述

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

<resources>  <declare-styleable name="TabsViewGroup">    <attr name="tabVerticalSpace" format="dimension" />    <attr name="tabHorizontalSpace" format="dimension" />  </declare-styleable></resources>

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"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:owen="http://schemas.android.com/apk/res-auto"  android:id="@+id/activity_main"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:background="#ffffff"  android:orientation="vertical">  <TextView    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:padding="10dp"    android:textSize="16sp"    android:text="国际足球"/>  <View    android:layout_width="wrap_content"    android:layout_height="0.1dp"    android:background="#e0e0e0"/>  <com.ownchan.tabviewgroup.view.TabsViewGroup    android:id="@+id/tabs_view"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:padding="10dip"    owen:tabHorizontalSpace="10dp"    owen:tabVerticalSpace="10dp" /></LinearLayout>

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：

xiaoguo