1.采用ViewHolder并避免在getView中執行耗時操作

@Override

public View getView(int position, View convertView, ViewGroup parent) {

ViewHolder holder = null;

if (convertView == null) {

convertView = mInflater.inflate(R.layout.image_list_item,parent, false);

holder = new ViewHolder();

holder.imageView = (ImageView) convertView.findViewById(R.id.image);

convertView.setTag(holder);

} else {

holder = (ViewHolder) convertView.getTag();

}

ImageView imageView = holder.imageView;

final String tag = (String)imageView.getTag();

final String uri = getItem(position);

if (!uri.equals(tag)) {

imageView.setImageDrawable(mDefaultBitmapDrawable);

}

if (mIsGridViewIdle && mCanGetBitmapFromNetWork) {

imageView.setTag(uri);

mImageLoader.bindBitmap(uri, imageView, mImageWidth, mImageWidth);

}

return convertView;

}

}

private static class ViewHolder {

public ImageView imageView;

}

2.根據列表的滑動狀態來控制任務的執行頻率

監聽滑動狀態，當滑動停止的時候再去加載圖片

@Override

public void onScrollStateChanged(AbsListView view, int scrollState) {

if (scrollState == OnScrollListener.SCROLL_STATE_IDLE) {

mIsGridViewIdle = true;

mImageAdapter.notifyDataSetChanged();

} else {

mIsGridViewIdle = false;

}

}

3.嘗試硬件加速來使ListView滑動更加流暢

android:hardwareAccelerated=”true”

總結

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