listview中图片跳动的问题

listview中item中imageview的时候，如果复用convertview，就会出现图片跳动的问题，解决的办法在item中不使用imageview，而是在代码中添加进去：

布局：

<?xml version="1.0" encoding="UTF-8"?><LinearLayout android:gravity="center_vertical"android:orientation="vertical" android:id="@+id/list_item_layout"android:background="@drawable/category_selector" android:layout_width="fill_parent"android:layout_height="wrap_content" xmlns:android="http://schemas.android.com/apk/res/android"><LinearLayout android:orientation="horizontal"android:layout_height="fill_parent" android:layout_width="fill_parent"><LinearLayout android:orientation="vertical"android:layout_height="fill_parent" android:layout_width="wrap_content"android:id="@+id/ll_book_image"><RatingBar android:paddingTop="3dip" android:id="@+id/ratingbar"style="?android:attr/ratingBarStyleSmall" android:layout_width="65.0dip"android:stepSize="0.5" android:isIndicator="true"android:layout_height="wrap_content" android:layout_gravity="center_vertical"android:numStars="5" /></LinearLayout><LinearLayout android:orientation="vertical"android:paddingLeft="15dip" android:layout_height="fill_parent"android:layout_width="fill_parent"><TextView android:textColor="@android:color/black" android:textSize="20dp"android:maxHeight="50dip" android:id="@+id/book_title"android:textStyle="bold" android:layout_width="wrap_content"android:layout_height="wrap_content" /><TextView android:textColor="@android:color/black" android:textSize="15dp"android:id="@+id/book_description" android:layout_width="wrap_content"android:maxHeight="60dip" android:layout_height="wrap_content" /></LinearLayout></LinearLayout></LinearLayout>

代码：

public View getView(int position, View convertView, ViewGroup parent) {NewBook newbook = newbooks.get(position);View view;if(convertView==null){view = View.inflate(NewBookActivity.this, R.layout.new_book_item, null);}else{view = convertView;}final ImageView iv = new ImageView(NewBookActivity.this);//RatingBar rb = new RatingBar(NewBookActivity.this);  RatingBar rb = new RatingBar(NewBookActivity.this, null, android.R.attr.ratingBarStyleSmall);rb.setMax(5);rb.setProgress(4);LinearLayout ll = (LinearLayout) view.findViewById(R.id.ll_book_image);//清空ll的里面的view对象ll.removeAllViews();ll.addView(iv, new LayoutParams(60, 60));ll.addView(rb,new LayoutParams(60, LayoutParams.WRAP_CONTENT));TextView tv_title = (TextView) view.findViewById(R.id.book_title);TextView tv_description = (TextView) view.findViewById(R.id.book_description);rb.setRating(4.0f);tv_title.setText(newbook.getName());tv_description.setText(newbook.getDescription());SharedPreferences  sp = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());boolean canloadicon = sp.getBoolean("canloadicon", false);if(canloadicon){LoadImageAsynTask task = new LoadImageAsynTask(new LoadImageAsynTaskCallback() {public void beforeLoadImage() {iv.setImageResource(R.drawable.book);}public void afterLoadImage(Bitmap bitmap) {if(bitmap!=null){iv.setImageBitmap(bitmap);}else{iv.setImageResource(R.drawable.book);}}});task.execute(newbook.getIconpath());}else{iv.setImageResource(R.drawable.book);}return view;}