動態計算listView中item 的高度時，如果其中textview超過一行，只會計算其中第一行的剛度，（雙層listview巢狀使用時經常出現這種問題）。我們需要自定義textview，動態計算textView的高度，具體程式碼如下

package com.example.wisdomoperating.view;
import android.app.Activity;
import android.content.Context;
import android.text.Layout;
import android.util.AttributeSet;
import android.util.FloatMath;
 
import android.widget.LinearLayout;
import android.widget.TextView;
/**
 * 
 * @author zhengaoyang 
 *自定義TextView，解決計算listView中item高度的時候，如果其中的TextView字數超過一行，只計算到一行高度的問題
*/
public class myTextView extends TextView {

   private Context context;
   public myTextView(Context context) {
      super(context);
 
// TODO Auto-generated constructor stub
this.context = context;
}
   public myTextView(Context context, AttributeSet attrs) {
      super(context, attrs);
// TODO Auto-generated constructor stub
this.context = context;
}
   public myTextView(Context context, AttributeSet attrs, int defStyle) {
      super
 
(context, attrs, defStyle);
// TODO Auto-generated constructor stub
this.context = context;
}

   
   

   
   
   @Override
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 = ((LinearLayout)this.getParent()).getPaddingLeft();
      float paddingReft = ((LinearLayout)this.getParent()).getPaddingRight();
//這裡具體this.getPaint()要注意使用，要看你的TextView在什麼位置，這個是拿TextView父控制元件的Padding的，為了更準確的算出換行
int line = (int) Math.ceil( (this.getPaint().measureText(str)/(screenW-paddingLeft-paddingReft))); 
height = (this.getPaint().getFontMetrics().descent-this.getPaint().getFontMetrics().ascent)*line; return height;}
}