如何验证片段中的 recyclerview 适配器 TextInputEditText?
How can I validate recyclerview adapter TextInputEditText from fragment?
我有一个片段,其中包含一个 recyclerview。这个 recyclerview 由一个包含 viewholder 模式的适配器管理。
在我有一个 "Save" 按钮的片段中,这个按钮必须检查列表中没有 TextInputEditText 为空。
问题是我无法访问适配器的 TextInputEditText。 ViewHolder 只能通过 "onBindViewHolder" 方法访问。
我尝试以某种方式从片段访问:
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);
通过这样做,我成功地在 TextInputLayout 中标记了错误。我还能够获取 TextInputEditText 的文本。一切似乎都正常,但是...
列表更改时出现问题,我需要通过调用 notifyDataSetChanged
刷新适配器
findViewHolderForAdapterPosition
returns 列表的某些位置为空。
我在一些 post 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
不是一个好习惯。
谁能帮我搞定这个?看似不难,却让我浪费了很多时间。
我只想单击片段中的保存按钮并检查 recyclerview
的项目列表中是否没有 TextInputEditText
为空
谢谢
年你是对的,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) {
}
});
}
然后在保存按钮上从列表中获取值。
试试这个
AddMoreAdapter
public class AddMoreAdapter extends RecyclerView.Adapter<AddMoreAdapter.ViewHolder> {
Context context;
ArrayList<AddMorePojo> arrayList;
public AddMoreAdapter(Context context, ArrayList<AddMorePojo> arrayList) {
this.context = context;
this.arrayList = arrayList;
}
@Override
public AddMoreAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.addmorelayout, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(AddMoreAdapter.ViewHolder holder, int position) {
Log.e("VALUE ", arrayList.get(position).getUserName());
if (!TextUtils.isEmpty(arrayList.get(position).getUserName())) {
holder.edtName.setText(arrayList.get(position).getUserName());
}
if (!TextUtils.isEmpty(arrayList.get(position).getError())) {
holder.edtName.setError(arrayList.get(position).getError());
} else {
holder.edtName.setError(null);
}
}
@Override
public int getItemCount() {
return arrayList.size();
}
public ArrayList<AddMorePojo> getArrayList() {
return arrayList;
}
public class ViewHolder extends RecyclerView.ViewHolder {
EditText edtName;
public ViewHolder(View itemView) {
super(itemView);
edtName = itemView.findViewById(R.id.edtUname);
edtName.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) {
arrayList.get(getAdapterPosition()).setUserName(charSequence.toString());
}
@Override
public void afterTextChanged(Editable editable) {
}
});
}
}
}
AddMorePojo
public class AddMorePojo
{
String userName,error;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getError() {
return error;
}
public void setError(String error) {
this.error = error;
}
}
MyActivity
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();
}
}
});
}
}
layout.activity_my
<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>
addmorelayout
<?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>
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
}
现在在您的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;
}
}
现在在你的片段中点击你的按钮就像调用 adapter.setSubmitClick(true);
然后像下面那样验证数据。
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();
}
我有一个片段,其中包含一个 recyclerview。这个 recyclerview 由一个包含 viewholder 模式的适配器管理。 在我有一个 "Save" 按钮的片段中,这个按钮必须检查列表中没有 TextInputEditText 为空。
问题是我无法访问适配器的 TextInputEditText。 ViewHolder 只能通过 "onBindViewHolder" 方法访问。 我尝试以某种方式从片段访问:
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);
通过这样做,我成功地在 TextInputLayout 中标记了错误。我还能够获取 TextInputEditText 的文本。一切似乎都正常,但是...
列表更改时出现问题,我需要通过调用 notifyDataSetChanged
findViewHolderForAdapterPosition
returns 列表的某些位置为空。
我在一些 post 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
不是一个好习惯。
谁能帮我搞定这个?看似不难,却让我浪费了很多时间。
我只想单击片段中的保存按钮并检查 recyclerview
TextInputEditText
为空
谢谢
年你是对的,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) {
}
});
}
然后在保存按钮上从列表中获取值。
试试这个
AddMoreAdapter
public class AddMoreAdapter extends RecyclerView.Adapter<AddMoreAdapter.ViewHolder> {
Context context;
ArrayList<AddMorePojo> arrayList;
public AddMoreAdapter(Context context, ArrayList<AddMorePojo> arrayList) {
this.context = context;
this.arrayList = arrayList;
}
@Override
public AddMoreAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.addmorelayout, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(AddMoreAdapter.ViewHolder holder, int position) {
Log.e("VALUE ", arrayList.get(position).getUserName());
if (!TextUtils.isEmpty(arrayList.get(position).getUserName())) {
holder.edtName.setText(arrayList.get(position).getUserName());
}
if (!TextUtils.isEmpty(arrayList.get(position).getError())) {
holder.edtName.setError(arrayList.get(position).getError());
} else {
holder.edtName.setError(null);
}
}
@Override
public int getItemCount() {
return arrayList.size();
}
public ArrayList<AddMorePojo> getArrayList() {
return arrayList;
}
public class ViewHolder extends RecyclerView.ViewHolder {
EditText edtName;
public ViewHolder(View itemView) {
super(itemView);
edtName = itemView.findViewById(R.id.edtUname);
edtName.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) {
arrayList.get(getAdapterPosition()).setUserName(charSequence.toString());
}
@Override
public void afterTextChanged(Editable editable) {
}
});
}
}
}
AddMorePojo
public class AddMorePojo
{
String userName,error;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getError() {
return error;
}
public void setError(String error) {
this.error = error;
}
}
MyActivity
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();
}
}
});
}
}
layout.activity_my
<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>
addmorelayout
<?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>
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
}
现在在您的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;
}
}
现在在你的片段中点击你的按钮就像调用 adapter.setSubmitClick(true);
然后像下面那样验证数据。
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();
}