zqHero/FlowLayoutDemo

流布局中，标签的选中，添加和删除...

带有标签的 流布局的增删demo:

项目中经常遇到这样的例子：界面上很多标签，共用户选择，用户可以自行添加，自行删除。 随手写了一个：

效果图：

核心源码：

自定义ViewGroup： FlowLayout.java package com.ac.flowlayout_danxuan;

import java.util.ArrayList; import java.util.List;

import android.content.Context; import android.util.AttributeSet; import android.view.View; import android.view.ViewGroup;

/**

• com.ac.flowlayout_danxuan

• @Email zhaoq_hero@163.com

• @author zhaoQiang : 2016-2-23 */ public class FlowLayout extends ViewGroup {

  private static final String TAG = "FlowLayout";

  public FlowLayout(Context context, AttributeSet attrs) { super(context, attrs); }

  @Override protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { return new MarginLayoutParams(p); }

  @Override public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs) { return new MarginLayoutParams(getContext(), attrs); }

  @Override protected ViewGroup.LayoutParams generateDefaultLayoutParams() { return new MarginLayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT); }

  /**

  • 负责设置子控件的测量模式和大小 根据所有子控件设置自己的宽和高 */ @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); // 获得它的父容器为它设置的测量模式和大小 int sizeWidth = MeasureSpec.getSize(widthMeasureSpec); int sizeHeight = MeasureSpec.getSize(heightMeasureSpec); int modeWidth = MeasureSpec.getMode(widthMeasureSpec); int modeHeight = MeasureSpec.getMode(heightMeasureSpec);

// Log.e(TAG, sizeWidth + "," + sizeHeight);

	// 如果是warp_content情况下，记录宽和高
	int width = 0;
	int height = 0;
	/**
	 * 记录每一行的宽度，width不断取最大宽度
	 */
	int lineWidth = 0;
	/**
	 * 每一行的高度，累加至height
	 */
	int lineHeight = 0;
	
	int cCount = getChildCount();
	
	// 遍历每个子元素
	for (int i = 0; i < cCount; i++) {
		View child = getChildAt(i);
		// 测量每一个child的宽和高
		measureChild(child, widthMeasureSpec, heightMeasureSpec);
		// 得到child的lp
		MarginLayoutParams lp = (MarginLayoutParams) child
				.getLayoutParams();
		// 当前子空间实际占据的宽度
		int childWidth = child.getMeasuredWidth() + lp.leftMargin
				+ lp.rightMargin;
		// 当前子空间实际占据的高度
		int childHeight = child.getMeasuredHeight() + lp.topMargin
				+ lp.bottomMargin;
		/**
		 * 如果加入当前child，则超出最大宽度，则的到目前最大宽度给width，类加height 然后开启新行
		 */
		if (lineWidth + childWidth > sizeWidth) {
			width = Math.max(lineWidth, childWidth);// 取最大的
			lineWidth = childWidth; // 重新开启新行，开始记录
			// 叠加当前高度，
			height += lineHeight;
			// 开启记录下一行的高度
			lineHeight = childHeight;
		} else {
			// 否则累加值lineWidth,lineHeight取最大高度
			lineWidth += childWidth;
			lineHeight = Math.max(lineHeight, childHeight);
		}
		// 如果是最后一个，则将当前记录的最大宽度和当前lineWidth做比较
		if (i == cCount - 1) {
			width = Math.max(width, lineWidth);
			height += lineHeight;
		}

	}
	setMeasuredDimension((modeWidth == MeasureSpec.EXACTLY) ? sizeWidth : width,
			(modeHeight == MeasureSpec.EXACTLY) ? sizeHeight : height);
}

/**
 * 存储所有的View，按行记录
 */
private List<List<View>> mAllViews = new ArrayList<List<View>>();

public List<List<View>> getmAllViews() {
	return mAllViews;
}

public void setmAllViews(List<List<View>> mAllViews) {
	this.mAllViews = mAllViews;
}

/**
 * 记录每一行的最大高度
 */
private List<Integer> mLineHeight = new ArrayList<Integer>();

@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
	mAllViews.clear();
	mLineHeight.clear();

	int width = getWidth();

	int lineWidth = 0;
	int lineHeight = 0;
	// 存储每一行所有的childView
	List<View> lineViews = new ArrayList<View>();
	int cCount = getChildCount();
	// 遍历所有的孩子
	for (int i = 0; i < cCount; i++) {
		View child = getChildAt(i);
		MarginLayoutParams lp = (MarginLayoutParams) child
				.getLayoutParams();
		int childWidth = child.getMeasuredWidth();
		int childHeight = child.getMeasuredHeight();

		// 如果已经需要换行
		if (childWidth + lp.leftMargin + lp.rightMargin + lineWidth > width) {
			// 记录这一行所有的View以及最大高度
			mLineHeight.add(lineHeight);
			// 将当前行的childView保存，然后开启新的ArrayList保存下一行的childView
			mAllViews.add(lineViews);
			lineWidth = 0;// 重置行宽
			lineViews = new ArrayList<View>();
		}
		/**
		 * 如果不需要换行，则累加
		 */
		lineWidth += childWidth + lp.leftMargin + lp.rightMargin;
		lineHeight = Math.max(lineHeight, childHeight + lp.topMargin + lp.bottomMargin);
		lineViews.add(child);
	}
	// 记录最后一行
	mLineHeight.add(lineHeight);
	mAllViews.add(lineViews);

	int left = 0;
	int top = 0;
	// 得到总行数
	int lineNums = mAllViews.size();
	for (int i = 0; i < lineNums; i++) {
		// 每一行的所有的views
		lineViews = mAllViews.get(i);
		// 当前行的最大高度
		lineHeight = mLineHeight.get(i);

// Log.e(TAG, "第" + i + "行 ：" + lineViews.size() + " , " + lineViews); // Log.e(TAG, "第" + i + "行， ：" + lineHeight);

		// 遍历当前行所有的View
		for (int j = 0; j < lineViews.size(); j++) {
			View child = lineViews.get(j);
			if (child.getVisibility() == View.GONE) {
				continue;
			}
			MarginLayoutParams lp = (MarginLayoutParams) child
					.getLayoutParams();

			//计算childView的left,top,right,bottom
			int lc = left + lp.leftMargin;
			int tc = top + lp.topMargin;
			int rc =lc + child.getMeasuredWidth();
			int bc = tc + child.getMeasuredHeight();

// Log.e(TAG, child + " , l = " + lc + " , t = " + t + " , r =" // + rc + " , b = " + bc);

			child.layout(lc, tc, rc, bc);
			
			left += child.getMeasuredWidth() + lp.rightMargin
					+ lp.leftMargin;
		}
		left = 0;
		top += lineHeight;
	}

}

}

TagItm.java package com.ac.flowlayout_danxuan;

import android.widget.TextView;

/**

• com.ac.flowlayout_danxuan
• @Email zhaoq_hero@163.com
• @author zhaoQiang : 2016-2-23 */ public class TagItem { public String tagText; //标签上的文本信息： public boolean tagCustomEdit; public int idx; public TextView mView; }

MainActivity.java package com.ac.flowlayout_danxuan;

import java.util.ArrayList;

import android.app.Activity; import android.os.Bundle; import android.view.LayoutInflater; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.TextView;

/**

• com.ac.flowlayout_danxuan

• @Email zhaoq_hero@163.com

• @author zhaoQiang : 2016-2-23 */ public class MainActivity extends Activity {

  FlowLayout mTagLayout; private ArrayList mAddTags = new ArrayList();

  private EditText inputLabel; private Button btnSure;

  // 存放标签数据的数组 String[] mTextStr = { "有点所", "有的", "控", "件都往左飘", "的感觉", "第一行满了", "往第二行飘" };

  ArrayList list = new ArrayList();

  @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);

   inputLabel = (EditText) LayoutInflater.from(this).inflate(R.layout.my_edit_text, null);
   
   btnSure = (Button) findViewById(R.id.btn_sure);
   
   mTagLayout = (FlowLayout) findViewById(R.id.tag_layout);
   
   initList();
   
   initLayout(list);
   
   initBtnListener();
  

  }

  private void initList() { for(int i=0;i<mTextStr.length;i++){ list.add(mTextStr[i]); } }

  private void initBtnListener() { /** * 初始化 单击事件： */ btnSure.setOnClickListener(new OnClickListener() {

   	@Override
   	public void onClick(View v) {
  
   		String label = inputLabel.getText().toString().trim();
   		
   		String[] newStr = new String[mTagLayout.getChildCount()];
   		
   		/**
   		 * 获取  子view的数量   并添加进去
   		 */
   		if(label!=null&&!label.equals("")){
   			for(int m = 0;m < mTagLayout.getChildCount()-1;m++){
   				newStr[m] =((TextView)mTagLayout.getChildAt(m).
   						findViewById(R.id.text)).getText().toString();//根据  当前   位置查找到 当前    textView中标签  内容
   			}
   			list.add(label);
   			initLayout(list);
   			inputLabel.setText("");
   		}
   	}
   });
  

  }

  private void initLayout(final ArrayList arr) {

   mTagLayout.removeAllViewsInLayout();
   /**
    * 创建 textView数组
    */
   final TextView[] textViews = new TextView[arr.size()];
   final TextView[] icons = new TextView[arr.size()];
   
   for (int i = 0; i < arr.size(); i++) {
   	
   	final int pos = i;
   	
   	final View view = (View) LayoutInflater.from(MainActivity.this).inflate(R.layout.text_view, mTagLayout, false);
   	
   	final TextView text = (TextView) view.findViewById(R.id.text);  //查找  到当前     textView
   	final TextView icon = (TextView) view.findViewById(R.id.delete_icon);  //查找  到当前  删除小图标
  
   	// 将     已有标签设置成      可选标签
   	text.setText(list.get(i));
   	/**
   	 * 将当前  textView  赋值给    textView数组
   	 */
   	textViews[i] = text;
   	icons[i] = icon;
   	
   	//设置    单击事件：
   	icon.setOnClickListener(new OnClickListener() {
   		
   		@Override
   		public void onClick(View v) {
   			//遍历  图标  删除 当前  被点击项
   			for(int j = 0; j < icons.length;j++){
   				if(icon.equals(icons[j])){  //获取   当前  点击删除图标的位置：
   					mTagLayout.removeViewAt(j);  
   					list.remove(j);
   					initLayout(list);
   				}
   			}
   		}
   	});
   	
   	text.setOnClickListener(new OnClickListener() {
   		
   		@Override
   		public void onClick(View v) {
   			
   			text.setActivated(!text.isActivated()); // true是激活的 
   			
   			if (text.isActivated()) {
   				boolean bResult = doAddText(list.get(pos), false, pos);
   				text.setActivated(bResult);
   				//遍历   数据    将图标设置为可见：
   				for(int j = 0;j< textViews.length;j++){
   					if(text.equals(textViews[j])){//非当前  textView
   						icons[j].setVisibility(View.VISIBLE);
   					}
   				}
   			}else{
   				for(int j = 0;j< textViews.length;j++){
   					icons[j].setVisibility(View.GONE);
   				}
   			}
   			
   			/**
   			 * 遍历  textView  满足   已经被选中     并且不是   当前对象的textView   则置为  不选
   			 */
   			for(int j = 0;j< textViews.length;j++){
   				if(!text.equals(textViews[j])){//非当前  textView
   					textViews[j].setActivated(false); // true是激活的 
   					icons[j].setVisibility(View.GONE);
   				}
   			}
   		}
   	});
   	
   	mTagLayout.addView(view);
   }
   
   mTagLayout.addView(inputLabel);
  

  }

  // 标签索引文本 protected int idxTextTag(String text) { int mTagCnt = mAddTags.size(); // 添加标签的条数 for (int i = 0; i < mTagCnt; i++) { TagItem item = mAddTags.get(i); if (text.equals(item.tagText)) { return i; } } return -1; }

  // 标签添加文本状态 private boolean doAddText(final String str, boolean bCustom, int idx) { int tempIdx = idxTextTag(str); if (tempIdx >= 0) { TagItem item = mAddTags.get(tempIdx); item.tagCustomEdit = false; item.idx = tempIdx; return true; } int tagCnt = mAddTags.size(); // 添加标签的条数 TagItem item = new TagItem(); item.tagText = str; item.tagCustomEdit = bCustom; item.idx = idx; mAddTags.add(item); tagCnt++; return true; }

  @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; }

}

activity_main.xml

<com.ac.flowlayout_danxuan.FlowLayout
    	android:id="@+id/tag_layout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#ff00f0"
        android:layout_marginTop="20dp">
</com.ac.flowlayout_danxuan.FlowLayout>
       
<Button 
    android:id="@+id/btn_sure"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="添加"
    />

项目源码：https://github.com/zqHero/FlowLayoutDemo

csdn：http://blog.csdn.net/u013233097/article/details/50724332