如何解决androidstudio recyclerview 和自定义对话框
我想创建一个带有回收站视图的自定义对话框。如果我选择回收器视图单元格并在对话框中按确定按钮，则文本视图将更改。我创建了回收器视图适配器、自定义对话框，但我不知道如何连接对话框和适配器以及在 onClick 函数中放入什么..请帮帮我..
custom_dialog.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/writing_dialog"
android:layout_width="match_parent"
android:layout_height="400dp">
<TextView
android:id="@+id/textView8"
android:layout_width="0dp"
android:layout_height="50dp"
android:fontFamily="@font/nexon"
android:text="choose!"
android:textAlignment="center"
android:gravity="center"
android:textColor="#341867"
android:textSize="20dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/writing_dialog_ok"
android:layout_width="65dp"
android:layout_height="39dp"
android:layout_marginEnd="20dp"
android:background="#00FFFFFF"
android:fontFamily="@font/nexon"
android:text="ok"
android:textColor="#341867"
android:textSize="15dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="@+id/guideline6" />
<Button
android:id="@+id/writing_dialog_cancel"
android:layout_width="65dp"
android:layout_height="39dp"
android:layout_marginEnd="30dp"
android:background="#00FFFFFF"
android:text="cancel"
android:textColor="#341867"
android:textSize="15dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toStartOf="@+id/writing_dialog_ok"
app:layout_constraintTop_toTopOf="@+id/guideline6" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_begin="355dp" />
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/writing_dialog_recy"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="20dp"
app:layout_constraintBottom_toTopOf="@+id/guideline6"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView8" />
</androidx.constraintlayout.widget.ConstraintLayout>
recyclerview 单元
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/dialog_container"
android:layout_width="match_parent"
android:layout_height="45dp">
<RadioButton
android:id="@+id/dialog_radio"
android:layout_width="0dp"
android:layout_height="45dp"
android:fontFamily="@font/nexon"
android:text="시리즈 1"
android:textSize="18dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
回收者视图适配器
public class WritingNovelAdapter extends RecyclerView.Adapter<WritingNovelAdapter.Holder>{
private Context context;
private ArrayList<WritingNovel_data> dataList;
public WritingNovelAdapter(Context context,ArrayList<WritingNovel_data> dataList){
this.context = context;
this.dataList = dataList;
}
public static class Holder extends RecyclerView.ViewHolder{
protected ConstraintLayout dialog_container;
protected RadioButton dialog_radio;
public Holder(View view){
super(view);
this.dialog_container = view.findViewById(R.id.dialog_container);
this.dialog_radio = view.findViewById(R.id.dialog_radio);
}
}
@Override
public WritingNovelAdapter.Holder onCreateViewHolder(ViewGroup parent,int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.writing_dialog_cell,parent,false);
Holder holder = new WritingNovelAdapter.Holder(view);
return holder;
}
@Override
public void onBindViewHolder(@NonNull WritingNovelAdapter.Holder holder,final int position) {
String title = dataList.get(position).title;
if(title.length() > 16){
title = title.substring(0,15) + "…";
}
holder.dialog_radio.setText(title);
holder.dialog_container.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view) {
//????????????????????????????
}
});
}
@Override
public int getItemCount() {
if(dataList == null){
return 0;
}
else{
return dataList.size();
}
}
}
自定义对话框类
class CustomDialog {
private Context context;
public CustomDialog(Context context)
{
this.context = context;
}
public void callDialog()
{
final Dialog dialog = new Dialog(context);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.writing_novel_series_dialog);
dialog.show();
final RecyclerView writing_dialog_recy = dialog.findViewById(R.id.writing_dialog_recy);
final Button writing_dialog_ok = dialog.findViewById(R.id.writing_dialog_ok);
final Button writing_dialog_cancel = dialog.findViewById(R.id.writing_dialog_cancel);
writing_dialog_ok.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
writing_dialog_cancel.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dialog.dismiss();
}
});
}
}
====EDIT-1====
我在这里调用我的对话！
public class writing_novel extends AppCompatActivity {
private static final int GALLERY_REQUEST = 979;
private RichEditor mEditor;
private ColorPicker colorPicker;
androidx.appcompat.app.AlertDialog.Builder textSizeDialogBuilder;
private NumberPicker textPicker;
androidx.appcompat.app.AlertDialog.Builder youtubeDialogBuilder;
private EditText etYoutubeUrl;
private Button writing_novel_btn_series;
private ImageButton writing_novel_novel_ibtn_next;
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case android.R.id.home:{
finish();
return true;
}
}
return super.onOptionsItemSelected(item);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_writing_novel);
Toolbar toolbar = findViewById(R.id.writing_novel_main_toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowTitleEnabled(false);
writing_novel_novel_ibtn_next = findViewById(R.id.writing_novel_novel_ibtn_next);
writing_novel_novel_ibtn_next.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog.Builder builder = new AlertDialog.Builder(writing_novel.this);
builder.setTitle("정말 다음으로 넘어가시겠습니까?").setMessage("다음으로 넘어가기전,한번 더 검토해주세요.");
builder.setPositiveButton("넘어가기",new DialogInterface.OnClickListener(){
@Override
public void onClick(DialogInterface dialog,int id)
{
Toast.makeText(getApplicationContext(),"OK Click",Toast.LENGTH_SHORT).show();
Intent intent = new Intent(writing_novel.this,decide_novel_title.class);
startActivity(intent);
}
});
builder.setNegativeButton("취소","Cancel Click",Toast.LENGTH_SHORT).show();
dialog.dismiss();
}
});
builder.setCancelable(false);
builder.create().show();
}
});
writing_novel_btn_series = findViewById(R.id.writing_novel_btn_series);
writing_novel_btn_series.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Bundle args = new Bundle();
args.putString("id","");
DialogFragment dialogFragment = new DialogFragment();
dialogFragment.setArguments(args);
dialogFragment.show(getFragmentManager(),"id");
CustomDialog dialog = new CustomDialog(writing_novel.this);
dialog.show(getSupportFragmentManager(),"CustomDialog");
}
});
解决方法
如果我理解正确的话，您正在尝试弄清楚如何显示 RecyclerView 项目列表，以及当单击某个项目时，在下面的 TextView 中显示其数据。如果我错了，请纠正我。
对于第一步，您已经接近了。您需要做的就是实例化一个新的布局管理器和一个适配器类的实例，并将它们传递给您的 RecyclerView。
将此添加到您的 CustomDialog 类：
public void callDialog() {
...
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(context);
writing_dialog_recy.setLayoutManager(layoutManager);
// I'm assumming you are passing a list of data here
WritingNovelAdapter adapter = new WritingNovelAdapter(context,dataList);
writing_dialog_recy.setAdapter(adapter);
...
至于在 textView 中显示文本，您有几种不同的实现方式。如果没有看到其余的相关代码很难说，但我建议实现回调接口并从您的 ViewHolder 调用该方法，如下所示：
- 在 Adapter 类中定义接口
public interface CallbackInterface {
void showText(String text);
}
- 在您的 CustomDialog 类中实现回调接口并实现
setText方法，您将在该方法中设置 TextView 中的文本。这将要求您有一个要在其中显示该文本的 TextView 实例，这意味着您必须在某处调用它：TextView textView = findViewById(R.id.textView8);
class CustomDialog implements CallbackInterface {
...
public void showText(String text) {
textView.setText(text);
}
}
- 将 CustomDialog 的实例传递给适配器（确保重新定义适配器构造函数以接受 CustomDialog 的实例
public void callDialog() {
...
// I'm assumming you are passing a list of data here
WritingNovelAdapter adapter = new WritingNovelAdapter(context,dataList,this);
writing_dialog_recy.setAdapter(adapter);
...
}
- 点击recyclerview单元格时从适配器类调用回调方法
public class WritingNovelAdapter extends RecyclerView.Adapter<WritingNovelAdapter.Holder> {
private Context context;
private ArrayList<WritingNovel_data> dataList;
private CallbackInterface callbackInterface;
public WritingNovelAdapter(Context context,ArrayList<WritingNovel_data>
dataList,CallbackInterface callbackInterface){
this.context = context;
this.dataList = dataList;
this.callbackInterface = callbackInterface;
}
...
holder.dialog_container.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view) {
callbackInterface.showText(title);
}
});
}
编辑 #1
您的评论表明您的对话框没有显示。除非您在 CustomDialog 类中遗漏了一些代码，否则所有 CustomDialog 类都是一个 Java 类。您需要扩展一个超类，例如 AlertDialog 或 DialogFragment。我会尽力总结如何做到这一点，但你应该看看 android 文档 -> https://developer.android.com/guide/topics/ui/dialogs
以下是您可以尝试创建的 DialogFragment 示例：
public class CustomDialog extends DialogFragment implements CallbackInterface {
private Context context;
private TextView textView;
private RecyclerView writing_dialog_recy;
public CustomDialog(Context context) {
this.context = context;
}
/* This is the method which builds and essentially shows the dialog */
@Override
public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
LayoutInflater inflater = getActivity().getLayoutInflater();
// Inflate your view that contains the recyclerview
View view = inflater.inflate(R.layout.custom_dialog);
// Your text view where you want to show the text after an item is clicked
textView = view.findViewById(R.id.textView8);
// Your recyclerview in your custom_dialog.xml
writing_dialog_recy = view.findViewById(R.id.writing_dialog_recy);
// Create the layout manager
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(context);
writing_dialog_recy.setLayoutManager(layoutManager);
// Create and set the adapter
WritingNovelAdapter adapter = new WritingNovelAdapter(context,this);
writing_dialog_recy.setAdapter(adapter);
builder.setView(view);
builder.setPositiveButton("Ok",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,int which) {
// do whatever you want when user clicks the positive button
}
});
builder.setNegativeButton("Cancel",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,int which) {
dialog.dismiss();
}
});
return builder.create(); // return the dialog builder
}
public void showText(String text) {
textView.setText(text);
}
}
然后在您创建此对话框的任何活动中，您都会显示 DialogFragment 并将其传递给活动的 FragmentManager 和一个标签
CustomDialog dialog = new CustomDialog(this);
dialog.show(getSupportFragmentManager(),"CustomDialog");
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