Android:Recycler视图';用户界面不';单击项目时是否不更改?
当我点击回收者视图的项目时,我试图改变该项目的背景。数据实际上发生了更改,但用户界面没有。我尝试了很多不同的方法,但都没有效果。虽然我正在调用notifyItemChanged(),但它不起作用 任何解决办法都会很有帮助 **我的代码:**Android:Recycler视图';用户界面不';单击项目时是否不更改?,android,android-recyclerview,Android,Android Recyclerview,当我点击回收者视图的项目时,我试图改变该项目的背景。数据实际上发生了更改,但用户界面没有。我尝试了很多不同的方法,但都没有效果。虽然我正在调用notifyItemChanged(),但它不起作用 任何解决办法都会很有帮助 **我的代码:** @覆盖 public void onBindViewHolder(@NonNull final ViewHolder ViewHolder,final int i){ customNoteView=notesList.get(i); notesText=vi
@覆盖
public void onBindViewHolder(@NonNull final ViewHolder ViewHolder,final int i){
customNoteView=notesList.get(i);
notesText=viewHolder.notesWriteArea;
notesImage=viewHolder.notesImage;
notesAudio=viewHolder.notesAudio;
notesAudioPlayButton=viewHolder.notesAudioPlayButton;
notesAudioSeekBar=viewHolder.notesAudioSeekBar;
notesAudioDeleteButton=viewHolder.notesAudioDeleteButton;
if(customNoteView.getNoteText()!=null){
editTextList.add(notesText);
notesText.setVisibility(View.VISIBLE);
notesImage.setVisibility(View.GONE);
notesAudio.setVisibility(View.GONE);
notesText.requestFocus();
focussedEditText=notesText;
notesText.setOnFocusChangeListener(新视图.OnFocusChangeListener(){
@凌驾
public void onFocusChange(视图,布尔b){
如果(b){
focussedEditText=((CustomEditText)视图);
//Toast.makeText(context,((CustomEditText)视图).getText().toString(),Toast.LENGTH_SHORT.show();
}
}
});
}
else if(customNoteView.getImageUri()!=0){
notesImage.setVisibility(View.VISIBLE);
notesText.setVisibility(View.GONE);
notesAudio.setVisibility(View.GONE);
Glide.with(notesImage.getContext())
.load(notesImage.getContext().getDrawable(customNoteView.getImageUri()))
.进入(注1);
notesImage.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图){
意图=新意图(上下文,全屏.class);
ActivityOptions Compat options=ActivityOptions Compat.MakeScenetTransitionAnimation((活动)上下文,
注:,
ViewCompat.getTransitionName(notesImage)
);
context.startActivity(intent,options.toBundle());
}
});
}
else if(customNoteView.getAudioUri()!=null){
notesAudio.setVisibility(View.VISIBLE);
notesImage.setVisibility(View.GONE);
notesText.setVisibility(View.GONE);
notesAudioPlayButton.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图){
setBackground(context.getDrawable(R.drawable.ic_pause));
notesAudio.setBackground(context.getDrawable(R.drawable.gray_矩形_背景));
notifyItemChanged(viewHolder.getAdapterPosition());
Toast.makeText(上下文“”+viewHolder.getAdapterPosition(),Toast.LENGTH_SHORT.show();
}
});
}
}
如果您想获得该类型的行为,您可以尝试在类中添加字段,并在每次在onBindViewHolder方法中绑定项时检查该字段:
if (current.isClicked) {
viewHolder.itemView.setBackgroundColor(*needed_color*);
} else {
viewHolder.itemView.setBackgroundColor(*default_color*);
}
viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
current.isClicked = !current.isClicked;
notifyItemChanged(viewHolder.getAdapterPosition());
}
});
current
-列表中i
位置上的项目
项目视图
-项目的根视图
如果您需要更多详细信息,请随时询问和评论。(答案被编辑和清理了几次)
尝试以下代码:
1) MainActivity.class:
public class MainActivity extends AppCompatActivity {
private final String TAG = MainActivity.class.getSimpleName();
private RecyclerView rv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rv = (RecyclerView) findViewById(R.id.rv);
rv.setLayoutManager(new LinearLayoutManager(MainActivity.this));
List<String> data = new ArrayList<>();
List<Boolean> selection_states = new ArrayList<>();
for (int i = 0; i < 10; i++) {
data.add("Item " + (i + 1));
selection_states.add(false);
}
rv.setAdapter(new MyRecyclerViewAdapter(MainActivity.this, data, selection_states));
}
public class MyRecyclerViewAdapter extends RecyclerView.Adapter<MyRecyclerViewAdapter.ViewHolder> {
private List<String> mData;
private List<Boolean> mSelectionStates;
private LayoutInflater mInflater;
MyRecyclerViewAdapter(Context context, List<String> data, List<Boolean> selection_states) {
this.mInflater = LayoutInflater.from(context);
this.mData = data;
this.mSelectionStates = selection_states;
}
@Override
@NonNull
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = mInflater.inflate(R.layout.recycler_view_item, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, final int position) {
holder.tv.setText(mData.get(position));
holder.ll.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
int previous_selected = -1;
for (int i = 0; i < getSelectionStates().size(); i++) {
if (getSelectionStates().get(i)) {
previous_selected = i;
break;
}
}
if (previous_selected == -1) { // nothing is selected
setSelectionState(position, true);
notifyItemChanged(position);
} else if (previous_selected != position) { // selected (other than current selected)
setSelectionState(previous_selected, false);
setSelectionState(position, true);
notifyItemChanged(previous_selected);
notifyItemChanged(position);
}
}
});
if (mSelectionStates.get(position)) {
//Log.i(TAG, "Select " + position);
holder.ll.setBackgroundColor(ContextCompat.getColor(MainActivity.this, android.R.color.holo_red_dark));
} else {
//Log.i(TAG, "De-Select " + position);
holder.ll.setBackgroundColor(ContextCompat.getColor(MainActivity.this, android.R.color.white));
}
}
private List<Boolean> getSelectionStates() {
return mSelectionStates;
}
private void setSelectionState(int position, boolean state) {
mSelectionStates.set(position, state);
}
@Override
public int getItemCount() {
return mData.size();
}
private class ViewHolder extends RecyclerView.ViewHolder {
final LinearLayout ll;
final TextView tv;
ViewHolder(View itemView) {
super(itemView);
ll = (LinearLayout) itemView.findViewById(R.id.ll);
tv = (TextView) itemView.findViewById(R.id.tv);
}
}
}
}
public类MainActivity扩展了AppCompatActivity{
private final String TAG=MainActivity.class.getSimpleName();
私人回收车;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rv=(RecyclerView)findViewById(R.id.rv);
rv.setLayoutManager(新的LinearLayoutManager(MainActivity.this));
列表数据=新的ArrayList();
列表选择_states=new ArrayList();
对于(int i=0;i<10;i++){
添加数据(“项目”+(i+1));
选择_states.add(false);
}
rv.setAdapter(新的MyRecycleServiceAdapter(MainActivity.this、数据、选择状态));
}
公共类MyRecycleServiceAdapter扩展了RecyclerView.Adapter{
私有列表数据;
私人名单国家;
私人停车场;
MyRecycleServiceAdapter(上下文上下文、列表数据、列表选择状态){
this.mInflater=LayoutInflater.from(上下文);
this.mData=数据;
this.mSelectionStates=选择状态;
}
@凌驾
@非空
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent,int viewType){
视图=最小充气器。充气(R.layout.recycler\u View\u项目,父项,false);
返回新的ViewHolder(视图);
}
@凌驾
public void onBindViewHolder(@NonNull ViewHolder,final int位置){
holder.tv.setText(mData.get(position));
holder.ll.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图){
int-previous_selected=-1;
对于(int i=0;i<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/rv">
</androidx.recyclerview.widget.RecyclerView>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:padding="20dp"
android:id="@+id/ll"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tv"
android:gravity="center"
android:textSize="20sp"/>
</LinearLayout>