[英]Add item to RecyclerView from AlertDialog input
在alertdialog框中输入数据后,我现在无法在RecyclerView
添加第二个+项目。
我可以输入1组数据但是当我尝试添加更多数据时,它什么也没做。
这是我正在使用的片段的Java文件:
public class tab1Expenses extends Fragment {
List<ExRow> expenseList = new ArrayList();
RecyclerView recyclerView;
ExpensesAdapter mAdapter;
Button btnEx;
EditText txtExName;
EditText txtExAmount;
public void expenseData() {
String Na = txtExName.getText().toString();
String Am = txtExAmount.getText().toString();
ExRow exs = new ExRow(Na, Am);
expenseList.add(exs);
mAdapter.notifyDataSetChanged();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View rootView = inflater.inflate(R.layout.tab1expense, container, false);
btnEx = (Button) rootView.findViewById(R.id.btnEx);
recyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view);
mAdapter = new ExpensesAdapter(expenseList);
final RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getActivity().getApplicationContext());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(mAdapter);
btnEx.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
View view = LayoutInflater.from(tab1Expenses.this.getActivity())
.inflate(R.layout.add_ex, null);
txtExName = (EditText) view.findViewById(R.id.exName);
txtExAmount = (EditText) view.findViewById(R.id.exAmount);
AlertDialog.Builder add = new AlertDialog.Builder(tab1Expenses.this.getActivity());
add.setCancelable(true)
.setTitle("Enter Expense:")
.setView(view)
.setPositiveButton("Add", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
expenseData();
}
});
Dialog dialog = add.create();
dialog.show();
}
});
return rootView;
}
}
以及适配器的Java文件:
public class ExpensesAdapter extends RecyclerView.Adapter<ExpensesAdapter.MyViewHolder> {
private List<ExRow> expenseList;
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView title, amount;
public MyViewHolder(View view) {
super(view);
title = (TextView) view.findViewById(R.id.name);
amount = (TextView) view.findViewById(R.id.amount);
}
}
public ExpensesAdapter(List<ExRow> expenseList) {
this.expenseList = expenseList;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.expense_list, parent, false);
return new MyViewHolder(itemView);
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
ExRow expense = expenseList.get(position);
holder.title.setText(expense.getTitle());
holder.amount.setText(expense.getAmount());
}
@Override
public int getItemCount() {
return expenseList.size();
}
}
用于格式化recyclerview列表项的XML:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/name"
android:textColor="@color/title"
android:textSize="16dp"
android:textStyle="bold"
android:layout_alignParentLeft="true"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<TextView
android:id="@+id/amount"
android:textColor="#000000"
android:layout_width="wrap_content"
android:layout_alignParentRight="true"
android:layout_height="wrap_content" />
</RelativeLayout>
这是片段的XML:
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.ojemz.expensetracker.tab1Expenses"
android:background="@android:color/darker_gray">
<Button
android:text="Add Expense"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btnEx"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:width="800dp"
android:textAppearance="@style/TextAppearance.AppCompat.Widget.Switch"
android:background="@android:color/black"
android:textColor="@android:color/holo_green_light"
android:textColorLink="@android:color/holo_green_light" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="450dp"
android:layout_alignParentBottom="true"
android:layout_alignParentStart="true"
android:layout_marginBottom="17dp">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="450dp"
android:scrollbars="vertical"
android:keepScreenOn="true"
android:isScrollContainer="true" />
</android.support.v4.widget.NestedScrollView>
</LinearLayout>
这是我目前在添加第二个输入后看到的内容
你不能这样做:
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentStart="true"
android:layout_marginBottom="17dp">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical" />
</ScrollView>
您的RecyclerView
现在高度为0。 您需要为其添加一些固定高度并设置滚动行为。 或者您可以使用NestedScrollView
或使用完全高度扩展编写LayoutManager
。 有关详情,请参阅此主题 。
添加
使用这个XML而不是你的但我没有IDE就写了它,所以它可能包含一些错误。
<FrameLayout 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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.ojemz.expensetracker.tab1Expenses"
android:background="@android:color/darker_gray">
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
android:keepScreenOn="true" />
<Button
android:text="Add Expense"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/btnEx"
android:layout_gravity="bottom|center_horizontal"
android:textAppearance="@style/TextAppearance.AppCompat.Widget.Switch"
android:background="@android:color/black"
android:textColor="@android:color/holo_green_light"
android:textColorLink="@android:color/holo_green_light" />
</FrameLayout>
我解决了我的问题。 这与回收物品的相对布局的高度有关。 它在匹配父级,我切换到包装内容,它现在显示屏幕上的输入
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