在回收视图中获取按钮状态
问题描述:
我正在使用Recycle view
,并且我试图仅在选定状态上设置button
一次。在回收视图中获取按钮状态
button 1 : when clicked set is as true .
button2 : when clicked set `button 1` to `false` state and then set `button 2` to `true`
button3: when clicked set `button 2` to `false` state and then set `button 3` to `true`
我的问题是如何让上一个按钮视图设置为false?
public class MyCustomAdapterPackages extends RecyclerView.Adapter<MyCustomAdapterPackages.CustomViewHolderPackages> {
private ArrayList<Packages> packages;
private Context mContext;
int id=-1;
public MyCustomAdapterPackages(Context context, ArrayList<Packages> packages) {
this.packages = packages;
this.mContext = context;
}
@Override
public CustomViewHolderPackages onCreateViewHolder(ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(mContext).inflate(R.layout.package_row_item, null);
CustomViewHolderPackages viewHolder = new CustomViewHolderPackages(view);
return viewHolder;
}
@Override
public void onBindViewHolder(final MyCustomAdapterPackages.CustomViewHolderPackages holder, final int position) {
final Packages pa = packages.get(position);
holder.PackageButton.setText(pa.getPackageName());
holder.PackagePrice.setText(String.valueOf(pa.getPackagePrice()));
holder.PackageButton.setBackground(ContextCompat.getDrawable(mContext, R.drawable.tab_bg_selector));
holder.PackageButton.setId(position);
holder.PackageButton.setTag(id);
View.OnClickListener clickListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
if(id<0){
view.setSelected(true);
id=view.getId();
}
else{
if(((Button)holder.getTag(id)).isSelected()) {
view.findViewById(id).setSelected(false);
view.setSelected(true);
id=view.getId();
}
else{
id=view.getId();
view.setSelected(true);
}
}
}
};
//Handle click event on both title and image click
holder.PackageButton.setOnClickListener(clickListener);
// holder.PackagePrice.setOnClickListener(clickListener);
holder.PackageButton.setTag(packages.get(position));
// holder.PackagePrice.setTag(packages.get(position));
// holder.viewGroup.addView(ll);
}
@Override
public int getItemCount() {
return (null != packages ? packages.size() : 0);
}
public class CustomViewHolderPackages extends RecyclerView.ViewHolder {
protected Button PackageButton;
protected TextView PackagePrice;
public CustomViewHolderPackages(View view) {
super(view);
this.PackageButton = (Button) view.findViewById(R.id.PackageButton);
this.PackagePrice = (TextView) view.findViewById(R.id.PackagePrice);
}
}
}
登录错误:
Process: hesham.bestdealsoft.topline.elitedishes, PID: 15922
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.view.View.isSelected()' on a null object reference
at hesham.bestdealsoft.topline.elitedishes.MyCustomAdapterPackages$1.onClick(MyCustomAdapterPackages.java:75)
at android.view.View.performClick(View.java:4848)
at android.view.View$PerformClick.run(View.java:20262)
at android.os.Handler.handleCallback(Handler.java:815)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5637)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)
答
我发现溶液
我应该从外部类通过再循环视图实例到我的定制适配器第一
薄内部回收视图适配器我可以通过它在recycle中的位置获取任何视图vie w和投它来查看持有人,然后可以做任何事情与支架
这里是代码:
出端类:
mRecyclerView2 = (RecyclerView) findViewById(R.id.list_Fragment);
mRecyclerView2.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView2.setLayoutManager(mLayoutManager);
mAdapter2 = new MyCustomAdapterPackages(this, PackagesList,mRecyclerView2);
mRecyclerView2.setAdapter(mAdapter2);
mAdapter2.notifyDataSetChanged();
在custome适配器类:
@Override
public void onBindViewHolder(final MyCustomAdapterPackages.CustomViewHolderPackages holder, final int position) {
final Packages pa = packages.get(position);
holder.PackageButton.setText(pa.getPackageName());
holder.PackagePrice.setText(String.valueOf(pa.getPackagePrice()));
holder.PackageButton.setBackground(ContextCompat.getDrawable(mContext, R.drawable.tab_bg_selector));
holder.PackageButton.setId(position);
holder.PackageButton.setTag(id);
View.OnClickListener clickListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
if(id<0){ // first time or default
view.setSelected(true);
id=view.getId();
}
else{
CustomViewHolderPackages row = (CustomViewHolderPackages)mRecyclerView.findViewHolderForAdapterPosition(id);
if(row.PackageButton.isSelected()) {
row.PackageButton.setSelected(false); // previous view
view.setSelected(true); // current view
id=view.getId();
}
else{
id=view.getId();
view.setSelected(true);
}
}
}
};
//Handle click event
holder.PackageButton.setOnClickListener(clickListener);
}
你可以添加id字段吗? –
id字段是= -1; –
你在哪里设置clickListener为按钮?发布完整代码recyclerview –