androi自定义自动换行的View（类似网页的标签Tag）

看来只有礼拜天才有时间写点博客啊，平时只能埋头苦干了。今天在公司加班，遇到一个需求，就是自动换行的TextView，有点像网页的tag标签，点击一下，就自动加上去了，不过这个是根据后台拿来的数据来显示多少个View，在网上找找，看见了许多，我自己也封装写一个吧，以便以后需要...开工

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package com.woyou.ui.component;
 
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
 
import com.citaq.ideliver.R;
 
/**
 * 自动换行的View
 *
 * @author shenzhou 2015年1月11日
 */
public class WordWrapView extends ViewGroup {
    private static final int PADDING_HOR = 10;// 水平方向padding
    private static final int PADDING_VERTICAL = 15;// 垂直方向padding
    private static final int SIDE_MARGIN = 10;// 左右间距
    private static final int TEXT_MARGIN = 10;
 
    public WordWrapView(Context context) {
        super(context);
    }
 
    public WordWrapView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
 
    public WordWrapView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }
 
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        int childCount = getChildCount();
        int autualWidth = r - l;
        int x = SIDE_MARGIN;// 横坐标开始
        int y = 0;// 纵坐标开始
        int rows = 1;
        for (int i = 0; i < childCount; i++) {
            View view = getChildAt(i);
            view.setBackgroundResource(R.drawable.shopdetail_keytag_bg);
            int width = view.getMeasuredWidth();
            int height = view.getMeasuredHeight();
            x += width + TEXT_MARGIN;
            if (x > autualWidth) {
                x = width + SIDE_MARGIN;
                rows++;
            }
            y = rows * (height + TEXT_MARGIN);
            if (i == 0) {
                view.layout(x - width - TEXT_MARGIN, y - height, x
                        - TEXT_MARGIN, y);
            } else {
                view.layout(x - width, y - height, x, y);
            }
        }
 
    }
 
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int x = 0;// 横坐标
        int y = 0;// 纵坐标
        int rows = 1;// 总行数
        int specWidth = MeasureSpec.getSize(widthMeasureSpec);
        int actualWidth = specWidth - SIDE_MARGIN * 2;// 实际宽度
        int childCount = getChildCount();
        for (int index = 0; index < childCount; index++) {
            View child = (TextView) getChildAt(index);
            child.setPadding(PADDING_HOR, PADDING_VERTICAL, PADDING_HOR,
                    PADDING_VERTICAL);
            child.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
            int width = child.getMeasuredWidth();
            int height = child.getMeasuredHeight();
            x += width + TEXT_MARGIN;
            if (x > actualWidth) {// 换行
                x = width;
                rows++;
            }
            y = rows * (height + TEXT_MARGIN);
        }
        setMeasuredDimension(actualWidth, y);
    }
 
}

具体使用：

我的项目的布局文件太长了，我就说了

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<com.woyou.ui.component.wordwrapview style="@style/shopDetailTextStyle" android:id="@+id/shopdetail_container" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:paddingleft="@dimen/dp20" android:paddingright="@dimen/dp20" android:paddingtop="@dimen/dp10"></com.woyou.ui.component.wordwrapview>

把这段布局文件加到你要把文字自动换行的地方。java文件中的使用：

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if ( !TextUtils.isEmpty(shopDetail.getInfo()) ) {
                    infoLin.setVisibility(View.VISIBLE);
                    //店铺关键字
                    String key = shopDetail.getKey();
                    strs = key.split("\|");
                    for (int i = 0; i < strs.length; i++) {
                          TextView textview = new TextView(mActivity);
                          textview.setText(strs[i]);
                          wordWrapView.addView(textview);
                    }
                    LogUtil.i(TAG, "tags:" + strs.toString());

前面还有找到控件什么的，我相信大家都是知道的。这只是核心代码，效果图如下：

加载中...

<喎�"http://www.2cto.com/kf/ware/vc/" target="_blank" class="keylink">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"java;"> /** 标签之间的间距 px */ private final int itemMargins = (int) getContext().getResources().getDimension(R.dimen.dp15); /** 标签的行间距 px */ private final int lineMargins = (int) getContext().getResources().getDimension(R.dimen.dp10);

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/**
     * 加载店铺关键字
     * @param tags
     */
    private void loadShopKeys (String[] tags) {
        if ( tags == null )
            return;
        final int containerWidth = container.getMeasuredWidth() - container.getPaddingRight()  - container.getPaddingLeft(); 
        final LayoutInflater inflater = mActivity.getLayoutInflater(); 
 
        /** 用来测量字符的宽度 */ 
        final Paint paint = new Paint(); 
        final TextView textView = (TextView) inflater.inflate(R.layout.item_textviewtag_lv, null); 
        final int itemPadding = textView.getCompoundPaddingLeft() + textView.getCompoundPaddingRight(); 
        final LinearLayout.LayoutParams tvParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,  LayoutParams.WRAP_CONTENT); 
        tvParams.setMargins(0, 0, itemMargins, 0); 
 
        paint.setTextSize(textView.getTextSize()); 
        LinearLayout layout = new LinearLayout(getContext()); 
        layout.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT)); 
        layout.setOrientation(LinearLayout.HORIZONTAL); 
        container.addView(layout); 
 
        final LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); 
        params.setMargins(0, lineMargins, 0, 0); 
 
        /** 一行剩下的空间 **/ 
        int remainWidth = containerWidth; 
 
        for (int i = 0; i < tags.length; ++i) { 
            final String text = tags[i]; 
            final float itemWidth = paint.measureText(text) + itemPadding; 
            if (remainWidth > itemWidth) { 
                addItemView(inflater, layout, tvParams, text); 
            } else { 
                resetTextViewMarginsRight(layout); 
                layout = new LinearLayout(getContext()); 
                layout.setLayoutParams(params); 
                layout.setOrientation(LinearLayout.HORIZONTAL); 
 
                /** 将前面那一个textview加入新的一行 */ 
                addItemView(inflater, layout, tvParams, text); 
                container.addView(layout); 
                remainWidth = containerWidth; 
            } 
            remainWidth = (int) (remainWidth - itemWidth + 0.5f) - itemMargins; 
        } 
        resetTextViewMarginsRight(layout); 
    } 
     
    /***************** 将每行最后一个textview的MarginsRight去掉 *********************************/ 
    private void resetTextViewMarginsRight(ViewGroup viewGroup) { 
        final TextView tempTx = (TextView) viewGroup.getChildAt(viewGroup.getChildCount() - 1); 
        tempTx.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); 
    } 
   
    private void addItemView(LayoutInflater inflater, ViewGroup viewGroup, android.widget.LinearLayout.LayoutParams tvParams, String text) { 
        final TextView itemTx = (TextView) inflater.inflate(R.layout.item_textviewtag_lv, null); 
        itemTx.setText(text); 
        viewGroup.addView(itemTx, tvParams); 
    } 

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原文地址：https://www.cnblogs.com/rabbit-bunny/p/4220673.html