【Android进阶】Android自定义组件之自动换行View，以TextView为例

原文地址：http://www.tuicool.com/articles/u2eEbe

原文效果图：

组件是继承的ViewGroup,在用的时候调用addView方法把TextView加进去，然后该组件会把textview放到合适的位置。

WordWrapView.java

package com.example.views;import android.content.Context;import android.graphics.Color;import android.util.AttributeSet;import android.view.View;import android.view.ViewGroup;public class WordWrapView extends ViewGroup {private static final int PADDING_HOR = 10;// 水平方向paddingprivate static final int PADDING_VERTICAL = 5;// 垂直方向paddingprivate static final int SIDE_MARGIN = 10;// 左右间距private static final int TEXT_MARGIN = 10;/** * @param context */public WordWrapView(Context context) {super(context);}/** * @param context * @param attrs * @param defStyle */public WordWrapView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);}/** * @param context * @param attrs */public WordWrapView(Context context, AttributeSet attrs) {super(context, attrs);}@Overrideprotected 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.setBackgroundColor(Color.GREEN);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);}}};@Overrideprotected 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 = 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);}}

MainActivity.java

public class MainActivity extends Activity {  private WordWrapView wordWrapView;  private String[] strs = new String[] { "哲学系", "新疆维吾尔族自治区", "新闻学", "心理学",      "犯罪心理学", "明明白白", "西方文学史", "计算机", "掌声", "心太软", "生命",      "程序开发" };  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    wordWrapView = (WordWrapView) this.findViewById(R.id.view_wordwrap);    for (int i = 0; i < 12; i++) {      TextView textview = new TextView(this);      textview.setText(strs[i]);      wordWrapView.addView(textview);    }  }}

当然我们在自己使用的时候 ，可以在添加TextView的时候设置文字的颜色和背景，此时必须注释掉 这句

//  view.setBackgroundColor(Color.GREEN);

效果如下：

position = "营销,行政";

if(position != null && position.length() > 0){String[] strArray = null;strArray = position.split(",");if(strArray != null && strArray.length > 0){for(int i = 0; i < strArray.length; i++){TextView textview = new TextView(ProjectDetailActivity.this);    textview.setText(strArray[i]);    textview.setTextColor(Color.WHITE);    textview.setBackgroundResource(R.drawable.blue_fillet_bg);    wordwrapview_recruitment_position.addView(textview);}}}

String treatment = "股权,薪酬,分红";if(treatment != null && treatment.length() > 0){String[] strArray = null;strArray = treatment.split(",");if(strArray != null && strArray.length > 0){for(int i = 0; i < strArray.length; i++){TextView textview = new TextView(ProjectDetailActivity.this);    textview.setText(strArray[i]);    textview.setTextColor(Color.WHITE);    textview.setBackgroundColor(getResources().getColor(R.color.project_green));    wordwrapview_recruitment_treatment.addView(textview);}}}

上文之所以解析字符串，是因为服务器发过来的是json格式的字符串，每一项以“，”分割

blue_fillet_bg.xml

<span style="font-family: 'Helvetica Neue', Helvetica, Tahoma, Arial, STXihei, 'Microsoft YaHei', 微软雅黑, sans-serif; line-height: 27.2px;"><?xml version="1.0" encoding="utf-8"?></span>

<shape xmlns:android="http://schemas.android.com/apk/res/android"     android:shape="rectangle">    <!-- 填充的颜色 -->    <solid android:color="#44B3F8" />    <!-- 设置按钮的四个角为弧形 -->    <!-- android:radius 弧形的半径 -->    <corners android:radius="5dip" />    </shape>

R.color.project_green

<color name="project_green">#88A637</color>