Android自定义ViewGroup,内容过长时可设置"..."截断

public class FeatureGroupView extends ViewGroup{
    //itemSpaceVertical为列与列之间的间距
    private int itemSpaceVertical, itemSpaceHorizontal, maxLineNum;
    private int paddingTop, paddingBottom, paddingLeft, paddingRight;
    private int moreTextColor, moreTextSize;
    private TextView moreTextView;

    public FeatureGroupView(Context context) {
        super(context);
    }

    public FeatureGroupView(Context context, AttributeSet attrs) {
        super(context, attrs);

        TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.FixedWidthViewGroup);//自定义样式，名字为FixedWidthViewGroup

        itemSpaceVertical = (int) typedArray.getDimension(R.styleable.FixedWidthViewGroup_itemSpaceVertical, 0);
        itemSpaceHorizontal = (int) typedArray.getDimension(R.styleable.FixedWidthViewGroup_itemSpaceHorizontal, 0);
        maxLineNum =  typedArray.getInt(R.styleable.FixedWidthViewGroup_maxLineNum, Integer.MAX_VALUE);
        moreTextColor = typedArray.getColor(R.styleable.FixedWidthViewGroup_moreTextColor, -1);
        moreTextSize = typedArray.getInt(R.styleable.FixedWidthViewGroup_moreTextSize, -1);
        paddingTop = getPaddingTop();
        paddingBottom = getPaddingBottom();
        paddingLeft = getPaddingLeft();
        paddingRight = getPaddingRight();

        typedArray.recycle();
    }


    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){
        final int count = getChildCount();
        int parentWidth = MeasureSpec.getSize(widthMeasureSpec) - paddingRight;
        if(maxLineNum != Integer.MAX_VALUE){
            moreTextView = createMore();
            moreTextView.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
            parentWidth = parentWidth - (itemSpaceVertical + moreTextView.getMeasuredWidth());

        }

        int lengthY = paddingTop;
        int lengthX = paddingLeft;
        int lineNum = 0;
        for(int i = 0; i < count; i++){
            final View child = getChildAt(i);
            if(child.getVisibility() == GONE){
                continue;
            }
            child.measure(MeasureSpec.UNSPECIFIED,MeasureSpec.UNSPECIFIED);
            int width = child.getMeasuredWidth();
            int height = child.getMeasuredHeight();

            if(lengthY <= paddingTop){
                lengthY += height;
            }
            if(i == 0){
                lengthX += width;
            }else{
                lengthX += width + itemSpaceVertical;
            }
            if(lengthX > parentWidth){
                lineNum++;
                if(lineNum >= maxLineNum){
                    //如果超过规定的最大行数 标记上一行最后一个为结束项
                    if(i - 1 >= 0){
                        LayoutData layoutData = (LayoutData) getChildAt(i - 1).getTag();
                        if (layoutData != null) {
                            layoutData.isEnd = true;
                        }
                    }
                    break;
                }

                lengthX = paddingLeft + width;
                lengthY = lengthY + height + itemSpaceHorizontal;
            }
            child.setTag(new LayoutData(lengthX, lengthY));
        }
        setMeasuredDimension(widthMeasureSpec, MeasureSpec.makeMeasureSpec( lengthY + paddingBottom, MeasureSpec.UNSPECIFIED));
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        for (int i = 0; i < getChildCount(); i++) {
            final View child = this.getChildAt(i);
            if (child.getVisibility() == GONE) {
                continue;
            }
            if(child.getTag() == null){
                break;
            }
            LayoutData layoutData = (LayoutData) child.getTag();
            if (layoutData != null) {
                int left = layoutData.x - child.getMeasuredWidth();
                int top = layoutData.y  - child.getMeasuredHeight();
                child.layout(left, top, layoutData.x,layoutData.y);
                if(layoutData.isEnd && moreTextView!= null){
                    addView(moreTextView);
                    moreTextView.layout(child.getRight() + itemSpaceVertical , child.getBottom() - moreTextView.getMeasuredHeight() ,
                            child.getRight()+ itemSpaceVertical + moreTextView.getMeasuredWidth(), child.getBottom());
                }
            }
        }
    }
　　 //简单起见，这里用了TextView，并设置内容为"..."
    private TextView createMore(){
        TextView more = new TextView(getContext());
        more.setText("...");
        more.setGravity(Gravity.CENTER);
        if(moreTextColor != -1){
            more.setTextColor(moreTextColor);
        }
        if(moreTextSize != -1){
            more.setTextSize(moreTextSize);
        }
        return more;
    }

    private class LayoutData{
        int x;
        int y;
        boolean isEnd;

        public LayoutData(int x, int y) {
            this.x = x;
            this.y = y;
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<resources>
    ...
    ...   
    <declare-styleable name="FixedWidthViewGroup">
        <attr name="itemSpaceVertical" format="dimension" />
        <attr name="itemSpaceHorizontal" format="dimension" />
        <attr name="maxLineNum" format="integer" />
        <attr name="moreTextColor" format="color" />
        <attr name="moreTextSize" format="integer" />
    </declare-styleable>
</resources>

<?xml version="1.0" encoding="utf-8"?>
<TextView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="3dp"
    android:gravity="center"
    android:paddingBottom="1dp"
    android:paddingLeft="3dp"
    android:paddingRight="3dp"
    android:paddingTop="1dp"
    android:singleLine="true"
    android:textColor="#80b2bf"
    android:textSize="11sp"
    android:background="@drawable/feature_item_bg"/>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item>
        <shape android:shape="rectangle">
            <stroke android:width="1dp" android:color="#80b2bf" />
            <solid android:color="@android:color/transparent" />
            <corners android:radius="2dp" />
        </shape>
    </item>

</selector>

<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:background="#FFEEDD">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:showDividers="middle"
        android:dividerPadding="20dp">

        <view.FeatureGroupView
            android:id="@+id/features1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:padding="10dp"
            android:orientation="horizontal"
            android:background="#d0d0d0"

            app:itemSpaceVertical="10dp"
            app:maxLineNum="1"
            app:moreTextColor="#80b2bf"
            app:moreTextSize="12"
            />
        <view.FeatureGroupView
            android:id="@+id/features2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:background="#d0d0d0"
            android:orientation="horizontal"

            app:itemSpaceVertical="4dp"
            app:itemSpaceHorizontal="4dp"
            app:maxLineNum="2"
            app:moreTextColor="#80b2bf"
            app:moreTextSize="12"
            />
        <view.FeatureGroupView
            android:id="@+id/features3"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:orientation="horizontal"
            android:paddingLeft="10dp"
            android:background="#d0d0d0"

            app:itemSpaceVertical="4dp"
            app:moreTextColor="#80b2bf"
            app:moreTextSize="12"
            />

        <view.FeatureGroupView
            android:id="@+id/features4"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:orientation="horizontal"
            android:background="#d0d0d0"
            android:padding="10dp"

            app:itemSpaceVertical="4dp"
            app:itemSpaceHorizontal="2dp"
            app:maxLineNum="2"
            app:moreTextColor="#80b2bf"
            app:moreTextSize="12"
            />
    </LinearLayout>
</ScrollView>

public class FeatureGroupActivity extends Activity {

    private FeatureGroupView featureGroupView1;
    private FeatureGroupView featureGroupView2;
    private FeatureGroupView featureGroupView3;
    private FeatureGroupView featureGroupView4;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_freture_group);
        featureGroupView1 = (FeatureGroupView)findViewById(R.id.features1);
        featureGroupView2 = (FeatureGroupView)findViewById(R.id.features2);
        featureGroupView3 = (FeatureGroupView)findViewById(R.id.features3);
        featureGroupView4 = (FeatureGroupView)findViewById(R.id.features4);

        addFeatures(featureGroupView1);
        addFeatures(featureGroupView2);
        addFeatures(featureGroupView3);
        addFeatures(featureGroupView4);
    }

    private void addFeatures(ViewGroup viewGroup){
        for(String str: getFeatures()){
            TextView feature = (TextView) getLayoutInflater().inflate(R.layout.item_feature, null);
            feature.setText(str);
            viewGroup.addView(feature);
        }
    }

    private List<String> getFeatures(){
        List<String> list = new ArrayList<>();
        list.add("北京");
        list.add("上海");
        list.add("广东");
        list.add("四川");
        list.add("威海");
        list.add("大连");
        list.add("青岛");
        list.add("浙江");
        list.add("海口");
        list.add("西安");
        list.add("山东");
        list.add("济南");
        list.add("河北");
        list.add("石家庄");
        list.add("香港");
        list.add("西藏");
        list.add("新疆");
        list.add("重庆");
        list.add("秦皇岛");
        list.add("保定");
        list.add("太原");
        list.add("天津");
        list.add("黑龙江");
        list.add("哈尔滨");
        return list;
    }
}