Android自定義控件ViewGroup實現(xiàn)標簽云

更新時間：2018年05月31日 09:09:01 作者：Owen-Chan

這篇文章主要為大家詳細介紹了Android自定義控件ViewGroup實現(xiàn)標簽云，具有一定的參考價值，感興趣的小伙伴們可以參考一下

本文實例為大家分享了Android自定義控件ViewGroup實現(xiàn)標簽云的具體代碼，供大家參考，具體內(nèi)容如下

實現(xiàn)的功能：

這里寫圖片描述

基本繪制流程：

構(gòu)造函數(shù)獲取自定義屬性
onMeasure()方法，測量子控件的大小
onLayout()方法，對子控件進行布局

1、自定義屬性

<resources>

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

</resources>

2、構(gòu)造函數(shù)中獲取自定義屬性值

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函數(shù)測量子控件大小，然后設(shè)置當(dāng)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);

    //輸出寬度高度以及測量模式
    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;
    }
    //左右邊距
    int left = getPaddingLeft();
    int top = getPaddingTop();
    //記錄每一行的寬度和高度
    int lineWidth = 0;
    int lineHeight = 0;
    // 如果是warp_content情況下，記錄寬和高
    int containerWidth = 0;
    int containerHeight = 0;
    // 遍歷每個子元素
    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函數(shù)對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、布局問自己中直接引用

<?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="國際足球"/>

  <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、代碼添加標簽

@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[]{"世預(yù)賽歐洲區(qū)",
        "世預(yù)賽南美區(qū)", "五人世界杯", "意甲", "美國大聯(lián)盟", "烏超", "英冠", "國際冠軍杯", "巴西圣保羅州杯", "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);
    }
}

效果圖：

xiaoguo