我有一个RecyclerView.其中,项目具有标准布局 – 一个TextView和一个ProgressBar.
项目在运行时添加到recyclerview.
每当添加一个Item时,都会启动一个更新ProgressBar的AsyncTask.
AsynTask保存了RecyclerView Adapter对ProgressBar对象的引用.
当回收器视图中的项目太多时,会发生此问题.
项目在运行时添加到recyclerview.
每当添加一个Item时,都会启动一个更新ProgressBar的AsyncTask.
AsynTask保存了RecyclerView Adapter对ProgressBar对象的引用.
当回收器视图中的项目太多时,会发生此问题.
我知道RecyclerView会回收任何旧视图,因此想要了解至少进度条的方法.
实现这个的理想方法是什么？
以下是适配器的摘录
public class RecViewAdapter extends
RecyclerView.Adapter<RecViewAdapter.ViewHolder> {
Context mContext;
List<String> mRunns;
static ExecutorService mExec;
static HashSet<Integer> mProcessed = new HashSet<>();
public RecViewAdapter(Context context,List<String> runns) {
mContext = context;
mRunns = runns;
mExec = Executors.newFixedThreadPool(1);
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup,int viewType) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.runnabel_item,viewGroup,false);
ViewHolder vh = new ViewHolder(v);
return vh;
}
@Override
public void onBindViewHolder(ViewHolder holder,int position) {
holder.runnName.setText(mRunns.get(position));
if (!mProcessed.contains(position)) {
new Progresstask(holder.pBar,position).executeOnExecutor(mExec,null);
mProcessed.add(position);
}
}
@Override
public int getItemCount() {
return mRunns.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder {
TextView runnName;
ProgressBar pBar;
public ViewHolder(View view) {
super(view);
runnName = (TextView) view.findViewById(R.id.textView);
pBar = (ProgressBar) view.findViewById(R.id.progressBar);
pBar.setIndeterminate(false);
pBar.setMax(100);
pBar.setProgress(0);
}
}
}
另外,我正在使用notifydatasetchanged将项目添加到RecyclerView.
解决方法
有点晚了,但我找到了让它运转的方法.
我的recyclerview包含大量的查看者,只有一个查看者有一个进度条.我有一个sqlite数据库,我在其中维护用于在我的服务和活动之间进行同步的标识符(以识别recyclerview中哪些视图需要更新).
根据您的实现,您必须找到一种方法来识别哪个广播事件对应于哪个适配器项.我已经给出了我在下面所做的简化版本.
进度条模型：
class ProgressModel{
String progressId;
int progress = 0;
}
public int getProgress(){
return progress;
}
ViewHolder：
public class ProgressViewHolder extends RecyclerView.ViewHolder {
private ProgressBar mProgressBar;
public ProgressViewHolder(View itemView) {
mProgressBar = (ProgressBar) itemView.findViewById(R.id.mProgressBar);
}
public ProgressBar getProgressBar() {
return mProgressBar;
}
}
在recyclerview适配器中,
@Override
public void onBindViewHolder(ProgressViewHolder holder,int position) {
ProgressModel item = mData.get(position);
int progress = item.getProgress();
if (progress > 0) {
ProgressBar downloadProgress = holder.getProgressBar();
if (downloadProgress.isIndeterminate()) {
downloadProgress.setIndeterminate(false);
}
downloadProgress.setProgress(progress);
}
}
public void refresh(position,ProgressModel item){
mData.set(position,item);
notifyItemChanged(position);
}
在实现的Activity中填充视图,创建自身的静态实例并将其传递给broadcastReceiver.我花了很长时间才发现静态实例是必需的,否则即使我调用notifyItemchanged(),视图也不会改变.
public class MainActivity extends Activity{
private static MainActivity instance;
private MyReceiver mReceiver;
private MyAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
instance = this;
mReceiver = new MyReceiver(instance);
//Todo: Initialize adapter with data and set to recyclerview
}
public void update(Intent intent){
ProgressModel model = new ProgressModel ();
//Todo: set progress detail from intent to model and get position from progressId
instance.mAdapter.refresh(position,model);
}
private static class MyReceiver extends broadcastReceiver {
MainActivity activity;
public DownloadReceiver(MainActivity activity) {
this.activity = activity;
}
@Override
public void onReceive(Context context,Intent intent) {
//pass intent with progress details to activity
activity.update(intent);
}
}
}
希望这可以帮助.