Android 如何从片段验证recyclerview适配器TextInputItemText?
我有一个片段,其中包含一个recyclerview。此recyclerview由包含viewholder模式的适配器管理。 在片段中,我有一个“保存”按钮,这个按钮必须检查列表中没有TextInputItemText为空 问题是我无法访问适配器的TextInputItemText。只能通过“onBindViewHolder”方法访问ViewHolder。 我试图以某种方式从fragment访问:Android 如何从片段验证recyclerview适配器TextInputItemText?,android,android-fragments,android-recyclerview,android-viewholder,android-textinputedittext,Android,Android Fragments,Android Recyclerview,Android Viewholder,Android Textinputedittext,我有一个片段,其中包含一个recyclerview。此recyclerview由包含viewholder模式的适配器管理。 在片段中,我有一个“保存”按钮,这个按钮必须检查列表中没有TextInputItemText为空 问题是我无法访问适配器的TextInputItemText。只能通过“onBindViewHolder”方法访问ViewHolder。 我试图以某种方式从fragment访问: for (int i = 0; i < employeeList.size(); i++) {
for (int i = 0; i < employeeList.size(); i++) {
View employeeView = recyclerEmployees.findViewHolderForAdapterPosition(i).itemView;
if (employeeView != null) {
TextInputLayout textInputLayoutName = employeeView.findViewById(R.id.tilName);
TextInputEditText textInputEditTextName = employeeView.findViewById(R.id.tieName);
for(int i=0;i
通过这样做,我成功地在TextInputLayout中标记了错误。我还能够获得TextInputInputText的文本。一切似乎都正常,但是
当列表更改时出现问题,我需要调用notifyDataSetChanged
findViewHolderForAdapterPosition
在列表的某些位置返回null
我在一些帖子中读到,调用该方法是不安全的
我还了解到,在onBindViewHolder
方法之外访问viewholder
不是一个好的做法
有人能帮我弄到这个吗?这似乎并不难,但它给我造成了极大的时间浪费
我只想单击片段中的“保存”按钮,检查myrecyclerview中的项目列表中是否没有TextInputItemText
为空
谢谢是的,你是对的,这并不难
@Override
public void onBindView(Object object, int pos) {
Employee employee = (Employee) object;
editText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
employee.setName(charSequence.toString());
}
@Override
public void afterTextChanged(Editable editable) {
}
});
}
在“保存”按钮上,从列表中获取值。试试这个
Addmore适配器
我的活动
公共类MyActivity扩展了AppCompatActivity{
回收视图myRc;
ArrayList ArrayList=新的ArrayList();
按钮btnGetData;
添加更多适配器;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
myRc=(RecyclerView)findViewById(R.id.myRc);
btnGetData=(按钮)findViewById(R.id.btnGetData);
myRc.setHasFixedSize(真);
myRc.setLayoutManager(新的LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false));
AddMorePojo AddMorePojo=新的AddMorePojo();
addMorePojo.setUserName(“”);
arrayList.add(addMorePojo);
AddMorePojo addMorePojo1=新的AddMorePojo();
addMorePojo1.setUserName(“”);
addMorePojo1.setError(“”);
arrayList.add(addMorePojo1);
AddMorePojo addMorePojo2=新的AddMorePojo();
addMorePojo2.setUserName(“”);
addMorePojo2.setError(“”);
arrayList.add(addMorePojo2);
adapter=新的AddMoreAdapter(此为arrayList);
myRc.setAdapter(适配器);
btnGetData.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图){
布尔标志=真;
ArrayList pojoArrayList=adapter.getArrayList();
对于(int i=0;i
layout.activity\u my
addmorelayout
例如,您可以在模型中使用布尔字段
class TestData{
private boolean isTextEmpty;
private String textData;
public void setTextEmpty(boolean isTrue){
isTextEmpty = isTrue;
}
public boolean isTextEmpty(){
return isTextEmpty;
}
public void setTextData(String data){
textData = data;
}
public void getData(){
return textData;
}
........
///other fields goes here
}
现在在列表中使用此模型并将其提供给适配器
public class TestAdapter extends RecyclerView.Adapter<TestAdapter.ViewHolder> {
ArrayList<TestData> arrayList;
boolean isSubmitClick = false;
public AddMoreAdapter(ArrayList<TestData> arrayList) {
this.arrayList = arrayList;
}
@Override
public TestAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.test_data_item, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(TestAdapter.ViewHolder holder, int position) {
TestData data = arrayList.get(holder.getAdapterPosition());
if (holder.editText.getText().toString()==null) {
if(isSubmitClick){
holder.inputText.setError("please enter a valid input");
}
data.setTextEmpty(true);
} else {
data.setTextEmpty(false);
//do something else
}
}
@Override
public int getItemCount() {
return arrayList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextInputLayout textInput;
EditText editName;
public ViewHolder(View itemView) {
super(itemView);
editName = itemView.findViewById(R.id.etTest);
textInput = itemView.findViewById(R.id.tilTest);
editName.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void afterTextChanged(Editable editable) {
arrayList.get(getAdapterPosition()).setTestData(editable.toString());
}
});
}
}
public void setSubmitClick(boolean isTrue){
this.isSubmitClick = isTrue;
}
}
最初,recyclerview中的所有edittext都是空的?在某些特定情况下,recyclerview可能是空的,尽管它不是空的normal@NileshRathod给出了我也在想的答案,只是检查一下。谢谢你的回答。这似乎毫无疑问是正确的答案。我看到的问题是arrayList不是可从viewholder访问class@jlopez没有明白你的意思吗?什么意思arrayList不能从viewholder类访问
我的viewholder是静态类。删除静态属性有问题吗?@jlopez我认为从viewholder中删除静态属性没有问题
public class MyActivity extends AppCompatActivity {
RecyclerView myRc;
ArrayList<AddMorePojo> arrayList = new ArrayList<>();
Button btnGetData;
AddMoreAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
myRc = (RecyclerView) findViewById(R.id.myRc);
btnGetData = (Button) findViewById(R.id.btnGetData);
myRc.setHasFixedSize(true);
myRc.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));
AddMorePojo addMorePojo = new AddMorePojo();
addMorePojo.setUserName("");
arrayList.add(addMorePojo);
AddMorePojo addMorePojo1 = new AddMorePojo();
addMorePojo1.setUserName("");
addMorePojo1.setError("");
arrayList.add(addMorePojo1);
AddMorePojo addMorePojo2 = new AddMorePojo();
addMorePojo2.setUserName("");
addMorePojo2.setError("");
arrayList.add(addMorePojo2);
adapter = new AddMoreAdapter(this, arrayList);
myRc.setAdapter(adapter);
btnGetData.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
boolean flag=true;
ArrayList<AddMorePojo> pojoArrayList = adapter.getArrayList();
for (int i = 0; i < pojoArrayList.size(); i++) {
if (pojoArrayList.get(i).getUserName().isEmpty()) {
pojoArrayList.get(i).setError("Please enter userName");
flag=false;
}else {
// pojoArrayList.get(i).setError("");
}
}
adapter = new AddMoreAdapter(MyActivity.this, pojoArrayList);
myRc.setAdapter(adapter);
if (flag){
Toast.makeText(MyActivity.this, "Valid data", Toast.LENGTH_SHORT).show();
}else {
Toast.makeText(MyActivity.this, "Invalid data", Toast.LENGTH_SHORT).show();
}
}
});
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<android.support.v7.widget.RecyclerView
android:id="@+id/myRc"
android:layout_width="match_parent"
android:paddingBottom="50dp"
android:layout_height="match_parent" />
<Button
android:id="@+id/btnGetData"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="20dp"
android:gravity="center"
android:layout_alignParentBottom="true"
android:text="Get Data" />
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:cardElevation="10dp"
app:cardUseCompatPadding="true">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<EditText
android:id="@+id/edtUname"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter User Name" />
</LinearLayout>
</android.support.v7.widget.CardView>
class TestData{
private boolean isTextEmpty;
private String textData;
public void setTextEmpty(boolean isTrue){
isTextEmpty = isTrue;
}
public boolean isTextEmpty(){
return isTextEmpty;
}
public void setTextData(String data){
textData = data;
}
public void getData(){
return textData;
}
........
///other fields goes here
}
public class TestAdapter extends RecyclerView.Adapter<TestAdapter.ViewHolder> {
ArrayList<TestData> arrayList;
boolean isSubmitClick = false;
public AddMoreAdapter(ArrayList<TestData> arrayList) {
this.arrayList = arrayList;
}
@Override
public TestAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.test_data_item, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(TestAdapter.ViewHolder holder, int position) {
TestData data = arrayList.get(holder.getAdapterPosition());
if (holder.editText.getText().toString()==null) {
if(isSubmitClick){
holder.inputText.setError("please enter a valid input");
}
data.setTextEmpty(true);
} else {
data.setTextEmpty(false);
//do something else
}
}
@Override
public int getItemCount() {
return arrayList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextInputLayout textInput;
EditText editName;
public ViewHolder(View itemView) {
super(itemView);
editName = itemView.findViewById(R.id.etTest);
textInput = itemView.findViewById(R.id.tilTest);
editName.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
}
@Override
public void afterTextChanged(Editable editable) {
arrayList.get(getAdapterPosition()).setTestData(editable.toString());
}
});
}
}
public void setSubmitClick(boolean isTrue){
this.isSubmitClick = isTrue;
}
}
public void isDataValid(){
for(int i = 0; i<arrayList.size(); i++){
TestData data = arrayList.get(i);
if(data.isTextEmpty()){
adapter.notifyItemChanged(i);
return;
}
}
//do something here as all data is valid
callServer();
}