android中ListView多次刷新重复执行getView的解决方法

来源：互联网发布：最新网络流行语段子编辑：程序博客网时间：2024/06/02 03:14

1.在android开发中，遇到listview的item中文本输入EditText中如果存在addTextChangedListener(new TextWatcher()的监听，导致多次执行监听代码从而使EditText的焦点多次变化，原本需要的数字输入法也出现快速切换的情况，这显然不是需求所容许的，所以也尝试过很多种网上所说的方法，结果是都没什么作用，最终只能放弃listview，改为LinearLayout动态添加view的方式实现列表，问题顺利解决。

2.出现这一情况的原因是listview的gridview()方法多次执行的原因，后来找到一种方法，自定义listview中加入标识，来去除重复执行的部分，如下：

public class WarmhomeListView extends ListView {public boolean isOnMeasure = false;public WarmhomeListView(Context context) {super(context);}public WarmhomeListView(Context context, AttributeSet attrs) {super(context, attrs);}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {isOnMeasure = true;int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);super.onMeasure(widthMeasureSpec, expandSpec);}@Overrideprotected void onLayout(boolean changed, int l, int t, int r, int b) {isOnMeasure = false;super.onLayout(changed, l, t, r, b);}}

在gridview()方法里加入以下代码：

@Overridepublic View getView(int position, View convertView, ViewGroup parent) {ViewHolder holder = null;if (convertView == null) {convertView = LayoutInflater.from(mContext).inflate(R.layout.layout_skuslist_catalog, null);holder = new ViewHolder(convertView);convertView.setTag(holder);} else {holder = (ViewHolder) convertView.getTag();}if(!(WarmhomeListView)parent.isOnMeasure) {return;}Catalog catalog = list.get(position);String selected = catalog.selected;if ("1".equals(selected)) {holder.tv_name.setBackgroundResource(R.drawable.activity_common_radius_byellow);holder.tv_name.setTextColor(mContext.getResources().getColor(R.color.red));} else {holder.tv_name.setBackgroundResource(R.drawable.activity_common_radius_gray2);holder.tv_name.setTextColor(mContext.getResources().getColor(R.color.textColorNormal));}holder.tv_id.setText(catalog.id);holder.tv_name.setText(catalog.name);return convertView;}

3.如果listview高度计算有误，底部一列无法显示，检查也许是你item里有textview文本类的组件高度是自适应的，那就应当重写组件，让其自己计算高度，如下：

public class MyTextView4TypeFaceAndHeight extends TextView {     private Context context;    public MyTextView4TypeFaceAndHeight(Context context) {        super(context);        init(context);    }    public MyTextView4TypeFaceAndHeight(Context context, AttributeSet attrs) {        super(context, attrs);        init(context);    }    public MyTextView4TypeFaceAndHeight(Context context, AttributeSet attrs, int defSyle) {        super(context, attrs, defSyle);        init(context);    }    public void init(Context context) {     if (isInEditMode()) {    return;    }        this.context = context;    }    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);Layout layout = getLayout();if (layout != null) {int height = (int) FloatMath.ceil(getMaxLineHeight(this.getText().toString())) + getCompoundPaddingTop()+ getCompoundPaddingBottom();int width = getMeasuredWidth();setMeasuredDimension(width, height);}}private float getMaxLineHeight(String str) {float height = 0.0f;float screenW = ((Activity) context).getWindowManager().getDefaultDisplay().getWidth();float paddingLeft;float paddingReft;ViewParent l = this.getParent();if (l instanceof RelativeLayout) {paddingLeft = ((RelativeLayout) this.getParent()).getPaddingLeft();paddingReft = ((RelativeLayout) this.getParent()).getPaddingRight();} else {paddingLeft = ((LinearLayout) this.getParent()).getPaddingLeft();paddingReft = ((LinearLayout) this.getParent()).getPaddingRight();}// 这里具体this.getPaint()要注意使用，要看你的TextView在什么位置，这个是拿TextView父控件的Padding的，为了更准确的算出换行int line = (int) Math.ceil((this.getPaint().measureText(str) / (screenW - paddingLeft - paddingReft)));height = (this.getPaint().getFontMetrics().descent - this.getPaint().getFontMetrics().ascent) * line;return height;}}

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