Unity异步加载属于多线程吗

Question

如题所述

Answer 1

同步加载会卡主线程，直到加载完才恢复；异步加载在后台进行，主线程依旧正常运转。

Answer 2

public View getView(int position, View convertView, ViewGroup parent) {
String url = mData.get(position);
ViewHolder viewHolder = null;
if (convertView == null) {
viewHolder = new ViewHolder();
convertView = mInflater.inflate(R.layout.listview_item, null);
viewHolder.imageView = (ImageView) convertView.findViewById(R.id.iv_lv_item);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.imageView.setTag(url);
viewHolder.imageView.setImageResource(R.drawable.ic_launcher);
mImageLoader.showImageByThread(viewHolder.imageView, url);
return convertView;
}

private class ImgHolder {
public Bitmap bitmap;
public ImageView imageView;
public String url;

public ImgHolder(ImageView iv, Bitmap bm,String url) {
this.imageView = iv;
this.bitmap = bm;
this.url = url;
}
}

public void showImageByThread(final ImageView imageView, final String url) {

mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
ImgHolder holder = (ImgHolder) msg.obj;
if (holder.imageView.getTag().equals(holder.url)) {
holder.imageView.setImageBitmap(holder.bitmap);
}
}
};
new Thread() {
@Override
public void run() {
Bitmap bitmap = getBitmapFromUrl(url);
Message message = Message.obtain();
message.obj = new ImgHolder(imageView, bitmap, url);
mHandler.sendMessage(message);
}
}.start();
}