Java 如何以编程方式更改按钮图像，如切换按钮回收查看按钮单击
我有一个Java 如何以编程方式更改按钮图像，如切换按钮回收查看按钮单击,java,android,listview,android-recyclerview,android-button,Java,Android,Listview,Android Recyclerview,Android Button,我有一个RecyclerView，其中填充了ListView。在每个列表视图上都有一个按钮，用于向上添加列表 以下是按钮未按下时的外观 以下是按钮按下时的外观， 如何使每个列表视图的按钮保持按下状态 这是我的适配器 public class BuildCustomAdapter extends RecyclerView.Adapter<BuildCustomAdapter.MyViewHolder> implements Filterable { private in
RecyclerViewListView列表视图按钮以下是按钮未按下时的外观
以下是按钮按下时的外观，
如何使每个
列表视图的按钮保持按下状态
这是我的适配器
public class BuildCustomAdapter extends RecyclerView.Adapter<BuildCustomAdapter.MyViewHolder> implements Filterable {
private int previousTotal = 0;
private boolean loading = true;
private List<Build> buildList;
private List<Build> buildListCopy;
private ItemFilter mFilter = new ItemFilter();
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.build_list_row, parent, false);
return new MyViewHolder(itemView);
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
Build build = buildList.get(position);
holder.imageView.setImageResource(build.getImages());
holder.name.setText(build.getName());
}
@Override
public int getItemCount() {
return buildList.size();
}
@Override
public Filter getFilter() {
if (mFilter == null) {
mFilter = new ItemFilter();
}
return mFilter;
}
public class MyViewHolder extends RecyclerView.ViewHolder {
public ImageView imageView;
public TextView name;
public Button button;
public MyViewHolder(View itemView) {
super(itemView);
imageView = (ImageView) itemView.findViewById(R.id.ivPerson);
name = (TextView) itemView.findViewById(R.id.tvPersonName);
button = (Button) itemView.findViewById(R.id.addbn);
}
}
private class ItemFilter extends Filter {
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (constraint != null && constraint.length() > 0) {
List<Build> filterList = new ArrayList<Build>();
for (int i = 0; i < buildList.size(); i++) {
if ((buildList.get(i).getName().toUpperCase())
.contains(constraint.toString().toUpperCase())) {
Build builddata = new Build(buildList.get(i).getImages(), buildList.get(i).getName());
filterList.add(builddata);
}
}
results.count = filterList.size();
results.values = filterList;
} else {
results.count = buildList.size();
results.values = buildList;
}
return results;
}
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
buildList = (ArrayList<Build>) results.values;
notifyDataSetChanged();
}
}
public BuildCustomAdapter(List<Build> buildList) {
this.buildList = buildList;
}
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
Build build = buildList.get(position);
holder.imageView.setImageResources(build.getImages());
holder.name.setText(build.getName());
setImageIntoButton(holder.button,build.isSelected());
holder.button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
build.setSelected(!build.isSelected());
setImageIntoButton(holder.button,build.isSelected());
}
});
}
private void setImageIntoButton(Button buttonView,boolean isSelected){
if(isSelected)
buttonView.setBackgroundResource(R.drawable.clicked_image);
else
buttonView.setBackgroundResource(R.drawable.cross_image);
}
勾选此项可为您的可绘图状态（已选择、已激活等）：
此外，ListView还有一个可供使用的choiceMode
转到您的布局R.layout.构建列表行
并将背景设置为要执行此操作的按钮，并使用选择器drawable设置加号和勾号图像，如下所示：
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/ic_tick" android:state_selected="true" />
<item android:drawable="@drawable/ic_plus" />
</selector>
如果在pojo类中使用selected作为布尔变量会更好，它将帮助适配器根据状态设置映像。实际上，无论何时上下滚动，不可见的项目都会从内存中删除，并且我们已经根据按钮事件更新了列表，所以第二次它将获取所需的状态并再次显示上一个状态图像
BuildCustomAdapter始终传递上下文无论何时创建适配器，上下文都会帮助您
您的适配器
public class BuildCustomAdapter extends RecyclerView.Adapter<BuildCustomAdapter.MyViewHolder> implements Filterable {
private int previousTotal = 0;
private boolean loading = true;
private List<Build> buildList;
private List<Build> buildListCopy;
private ItemFilter mFilter = new ItemFilter();
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.build_list_row, parent, false);
return new MyViewHolder(itemView);
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
Build build = buildList.get(position);
holder.imageView.setImageResource(build.getImages());
holder.name.setText(build.getName());
}
@Override
public int getItemCount() {
return buildList.size();
}
@Override
public Filter getFilter() {
if (mFilter == null) {
mFilter = new ItemFilter();
}
return mFilter;
}
public class MyViewHolder extends RecyclerView.ViewHolder {
public ImageView imageView;
public TextView name;
public Button button;
public MyViewHolder(View itemView) {
super(itemView);
imageView = (ImageView) itemView.findViewById(R.id.ivPerson);
name = (TextView) itemView.findViewById(R.id.tvPersonName);
button = (Button) itemView.findViewById(R.id.addbn);
}
}
private class ItemFilter extends Filter {
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (constraint != null && constraint.length() > 0) {
List<Build> filterList = new ArrayList<Build>();
for (int i = 0; i < buildList.size(); i++) {
if ((buildList.get(i).getName().toUpperCase())
.contains(constraint.toString().toUpperCase())) {
Build builddata = new Build(buildList.get(i).getImages(), buildList.get(i).getName());
filterList.add(builddata);
}
}
results.count = filterList.size();
results.values = filterList;
} else {
results.count = buildList.size();
results.values = buildList;
}
return results;
}
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
buildList = (ArrayList<Build>) results.values;
notifyDataSetChanged();
}
}
public BuildCustomAdapter(List<Build> buildList) {
this.buildList = buildList;
}
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
Build build = buildList.get(position);
holder.imageView.setImageResources(build.getImages());
holder.name.setText(build.getName());
setImageIntoButton(holder.button,build.isSelected());
holder.button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
build.setSelected(!build.isSelected());
setImageIntoButton(holder.button,build.isSelected());
}
});
}
private void setImageIntoButton(Button buttonView,boolean isSelected){
if(isSelected)
buttonView.setBackgroundResource(R.drawable.clicked_image);
else
buttonView.setBackgroundResource(R.drawable.cross_image);
}
ItemFilter
更改此声明
Build builddata = new Build(buildList.get(i).isSelected(), buildList.get(i).getName(),buildList.get(i).getImages());
这个方法是合适的，但是我已经通过编程实现了！在您的场景设置中，使用XML的选择器被认为是一种最好的方法。但是，如果想以编程方式切换，而不是使用IF条件，我将不建议通过这个代码，您就不必使用<代码> Bug =新建（R.Dababel.AK，“Aksahy Kumar”）；code>Hi Abdul Rizwan在我的例子中，我没有在活动类`Build=new Build（R.drawable.ak，“Aksahy Kumar”）中放置`public Build（boolean selected，String name）{//this.images=images；this.selected=selected；this.name=name；}`；buildList.add（build）`你能把你的活动代码。你到底想做什么？首先，如果您遇到困难，请检查代码和流程，然后告诉我。如果您正在创建一个对象并将其放入活动列表中，请通过类似Build（null，“alok kumar”）它将工作，我传递的第一个参数为null，因此默认情况下，它将布尔值设置为false。所以根据false，适配器将把crossImage设置到imageView中。我希望它能对您有所帮助。我已经尝试过这段代码，但错误是：（96，43）错误：不兼容的类型：int不能在活动类中转换为boolean，错误build=newbuild（R.drawable.ps，“Pramukh Swami”）；
Build builddata = new Build(buildList.get(i).isSelected(), buildList.get(i).getName(),buildList.get(i).getImages());