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我發現類似的主題已經多次解決，但我無法找到解決方案。
我使用帶自定義CursorAdapter的ListView，它從數據庫獲取數據。這些行是由基於自定義相對佈局的XML文件創建的，該佈局具有作爲背景的圖像，並且應該保持圖像的高寬比。相對佈局的寬度設置爲match_parent，然後根據圖像的高寬比計算高度。
在相對佈局中有5個項目（實際上有6個項目，第6個項目是空白視圖，只是將行分成兩半）：1個ImageView和4個自定義文本視圖，它們被修改爲自動調整大小文本取決於TextView的高度（文本的大小設置爲百分比，這裏參數heightPercentage是0.5，所以文本的大小應該是TextView高度的50％）。
一切似乎工作，但有時一些項目不能正確呈現（文本大小似乎是正確的，但TextView的寬度太短。滾動幾個項目後，然後返回一切都很好。
這裏是照片：
正確的（滾動後）：
不正確的一個（前滾動）
編輯： 我試圖使用在互聯網上發現的一些autosize textviews，行爲或多或少相似;有時視圖不能正確渲染，直到滾動ocurrs，或者它首先被正確渲染，但是在滾動後它被搞砸了......在我看來，在我所做的Listview行中使用的自定義視圖有一些特定的規則不明白:-(我試圖把方法像invalidateViews（），notifyDataSetChanged（）到代碼的不同位置，有時甚至像runInIOThread（），但沒有成功，行爲永遠不會改變...
帶有自定義自動調整的Android ListView Textview - 有些項目直到滾動才能正常顯示
下面是叫RelativeLayoutKeepRatio自定義相對佈局，稱爲WidthResizeTextView定製的TextView和自定義的CursorAdapter稱爲MyCWGCursorAdapter的代碼。
public class RelativeLayoutKeepRatio extends RelativeLayout {
private float aspectRatio = 0;
private ViewGroup.LayoutParams mLayoutParams = null;
public RelativeLayoutKeepRatio(Context context) {
super(context);
}
public RelativeLayoutKeepRatio(Context context, AttributeSet attrs) {
super(context, attrs);
aspectRatio = getAspectRatio(context, attrs);
}
public RelativeLayoutKeepRatio(Context context, AttributeSet attrs,
int defStyle) {
super(context, attrs, defStyle);
aspectRatio = getAspectRatio(context, attrs);
}
private float getAspectRatio(Context context, AttributeSet attrs)
{
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.LayoutKeepRatio);
float aspectRatio = a.getFloat(R.styleable.LayoutKeepRatio_aspectRatio, 0);
if (aspectRatio == 0)
{
Drawable bg = getBackground();
if (bg != null)
{
int mBgWidth = bg.getIntrinsicWidth();
int mBgHeight = bg.getIntrinsicHeight();
aspectRatio = (float)mBgWidth/(float)mBgHeight;
}
}
return aspectRatio;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mLayoutParams == null) {
mLayoutParams = getLayoutParams();
}
int width = 0;
int height = 0;
//the width is known and we want to calculate the height
if ((mLayoutParams.width == ViewGroup.LayoutParams.MATCH_PARENT ||
mLayoutParams.width == 0
) &&
mLayoutParams.height == ViewGroup.LayoutParams.WRAP_CONTENT)
{
width = MeasureSpec.getSize(widthMeasureSpec);
height = calculateHeight(width, aspectRatio);
//the height is known and we want to calculate the width
} else if ((mLayoutParams.height == ViewGroup.LayoutParams.MATCH_PARENT ||
mLayoutParams.height == 0
) &&
mLayoutParams.width == ViewGroup.LayoutParams.WRAP_CONTENT)
{
height = MeasureSpec.getSize(heightMeasureSpec);
width = calculateWidth(width, aspectRatio);
}
else //the width and height are known, we do not need to calculate anything
{
width = MeasureSpec.getSize(widthMeasureSpec);
height = MeasureSpec.getSize(heightMeasureSpec);
}
int mode = MeasureSpec.EXACTLY;
super.onMeasure(MeasureSpec.makeMeasureSpec(width, mode),
MeasureSpec.makeMeasureSpec(height, mode));
}
private int calculateWidth(int height, float aspectRatio)
{
return (int)((float) height * aspectRatio);
}
private int calculateHeight(int width, float aspectRatio)
{
return (int)((float) width/aspectRatio);
}
}
public class WidthResizeTextView extends TextView {
private float heightPercentage = 0;
public WidthResizeTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ResizeTextView);
heightPercentage = a.getFloat(R.styleable.ResizeTextView_HeightPercentage, 0);
}
public WidthResizeTextView(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ResizeTextView);
heightPercentage = a.getFloat(R.styleable.ResizeTextView_HeightPercentage, 0);
}
public WidthResizeTextView(Context context) {
super(context);
// TODO Auto-generated constructor stub
}
public float getHeightPercentage(){
return heightPercentage;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
String text = getText().toString();
int height = MeasureSpec.getSize(heightMeasureSpec);
int mode = MeasureSpec.getMode(heightMeasureSpec);
if (mode == MeasureSpec.EXACTLY){
setTextSize(TypedValue.COMPLEX_UNIT_PX, (int)((float)height * heightPercentage));
int neededWidth = (int)getPaint().measureText(text);
super.onMeasure(MeasureSpec.makeMeasureSpec(neededWidth, mode),
MeasureSpec.makeMeasureSpec(height, mode));
}
else
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
public class MyCWGCursorAdapter extends CursorAdapter {
String path = null;
Typeface face = null;
public MyCWGCursorAdapter(Context context, Cursor c, int flags) {
super(context, c, flags);
path = CommonUtils.getAppPath(context);
face = Typeface.createFromAsset(context.getAssets(), "fonts/CANDARA.TTF");
}
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
RelativeLayout row = (RelativeLayout)inflater.inflate(R.layout.row, parent, false);
ViewWrapper wrapper = new ViewWrapper(row);
row.setTag(wrapper);
return (row);
}
@Override
public void bindView(View row, Context context, Cursor cursor) {
// TODO Auto-generated method stub
ViewWrapper wrapper = (ViewWrapper)row.getTag();
String nick = cursor.getString(1);
String fileName = cursor.getString(2);
int count = cursor.getInt(3);
Bitmap bitmap = CommonUtils.applyCircleMask(BitmapFactory.decodeFile(path + fileName));
if (bitmap == null)
bitmap = BitmapFactory.decodeResource(context.getResources(), R.drawable.empty_cwg);
ImageView picture = wrapper.getImageView();
picture.setImageBitmap(bitmap);
WidthResizeTextView nickLabel = wrapper.getNickLabel();
nickLabel.setTypeface(face);
WidthResizeTextView nickTextView = wrapper.getNickTextView();
nickTextView.setText(nick);
nickTextView.setTypeface(face);
WidthResizeTextView countLabel = wrapper.getCountLabel();
countLabel.setTypeface(face);
WidthResizeTextView countTextView = wrapper.getCountTextView();
countTextView.setText("" + count);
countTextView.setTypeface(face);
}
class ViewWrapper {
View base;
ImageView imageView = null;
WidthResizeTextView nickLabel = null;
WidthResizeTextView nickTextView = null;
WidthResizeTextView countLabel = null;
WidthResizeTextView countTextView = null;
ViewWrapper(View base){
this.base = base;
}
ImageView getImageView(){
if (imageView == null){
imageView = (ImageView)base.findViewById(R.id.CWGView);
}
return imageView;
}
WidthResizeTextView getNickLabel(){
if (nickLabel == null) {
nickLabel = (WidthResizeTextView)base.findViewById(R.id.nickLabel);
}
return nickLabel;
}
WidthResizeTextView getNickTextView() {
if (nickTextView == null) {
nickTextView = (WidthResizeTextView)base.findViewById(R.id.nickTextView);
}
return nickTextView;
}
WidthResizeTextView getCountLabel(){
if (countLabel == null) {
countLabel = (WidthResizeTextView)base.findViewById(R.id.countLabel);
}
return countLabel;
}
WidthResizeTextView getCountTextView() {
if (countTextView == null) {
countTextView = (WidthResizeTextView)base.findViewById(R.id.countTextView);
}
return countTextView;
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<com.asharp.android.CWGs.RelativeLayoutKeepRatio
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:custom="http://schemas.android.com/apk/res/com.asharp.android.CWGs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/cwg_mycwg_bg" >
<ImageView
android:id="@+id/CWGView"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_margin="5dip"
android:adjustViewBounds="true"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:src="@drawable/empty_cwg" />
<com.asharp.android.CWGs.WidthResizeTextView
android:id="@+id/nickLabel"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_above="@+id/spacer"
android:layout_alignParentTop="true"
android:layout_marginLeft="10dip"
android:layout_toRightOf="@+id/CWGView"
android:bufferType="spannable"
android:gravity="left|center_vertical"
android:singleLine="true"
android:text="@string/nick"
android:ellipsize="none"
android:textColor="@color/MyCWG_field_names"
custom:HeightPercentage="0.5" />
<com.asharp.android.CWGs.WidthResizeTextView
android:id="@+id/nickTextView"
android:layout_toRightOf="@+id/countLabel"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_above="@+id/spacer"
android:layout_marginLeft = "10dip"
android:gravity="left|center_vertical"
android:text="0"
android:singleLine="true"
android:ellipsize="none"
android:bufferType="spannable"
custom:HeightPercentage="0.5"
android:background="#00FF00"
android:textColor="@color/MyCWG_field_values"/>
<View
android:id="@+id/spacer"
android:layout_width="match_parent"
android:layout_toRightOf="@id/CWGView"
android:layout_height="1px"
android:layout_centerVertical="true"
android:visibility="invisible"/>
<com.asharp.android.CWGs.WidthResizeTextView
android:id="@+id/countLabel"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_below="@id/spacer"
android:layout_marginLeft="10dip"
android:gravity="left|center_vertical"
android:layout_toRightOf="@+id/CWGView"
android:layout_alignParentBottom="true"
android:text="@string/count_colon"
android:ellipsize="none"
android:singleLine="true"
android:textColor="@color/MyCWG_field_names"
android:bufferType="spannable"
custom:HeightPercentage="0.5" />
<com.asharp.android.CWGs.WidthResizeTextView
android:id="@+id/countTextView"
android:layout_toRightOf="@id/countLabel"
android:layout_alignParentBottom="true"
android:layout_below="@id/spacer"
android:layout_marginLeft = "10dip"
android:gravity="left|center_vertical"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:singleLine="true"
android:ellipsize="none"
android:bufferType="spannable"
custom:HeightPercentage="0.5"
android:text="0"
android:textColor="@color/MyCWG_field_values"/>
</com.asharp.android.CWGs.RelativeLayoutKeepRatio>
你們當中有誰見過這樣的行爲？我花了幾天的時間試圖解決這個問題，但我沒有成功:-(我相信這跟WidthResizeTextView有關，因爲我花了很長時間才把它變成這樣工作，謝謝你幫幫我！
@ user2582585：從您的編輯中，似乎這是您自己的文章，但在以user2579825身份登錄之前。你應該只使用一個帳戶。要設置它，請按照此幫助頁上的說明進行操作：http://stackoverflow.com/help/merging-accounts – oberlies