由recyclerview插入的空自定义行

Question

我有一个自定义的对话框布局，以名称和数字的形式接受用户输入，并将其添加到一个回收器适配器使用的ArrayList中。还放置了if else验证，以确保如果用户没有输入任何内容，则不会添加新行，但问题是它确实添加了。代码如下-

public class MainActivity extends AppCompatActivity {
ArrayList<ContactModel> list = new ArrayList<>();
RecyclerView recyclerView;
ContactRecyclerAdapter adapter;
FloatingActionButton btnOpenDialog;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = findViewById(R.id.recyclerView);
btnOpenDialog = findViewById(R.id.btnOpenDialog);
btnOpenDialog.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Dialog dialog = new Dialog(MainActivity.this);
dialog.setContentView(R.layout.update_contact_dialog_layout);
EditText addTxtName = dialog.findViewById(R.id.addTxtName);
EditText addTxtNumber = dialog.findViewById(R.id.addTxtNumber);
Button btnAction = dialog.findViewById(R.id.problmBtn);
btnAction.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String name = "", number = "";
if (addTxtName.getText().toString().equals("")){
Toast.makeText(MainActivity.this, "Please add a valid name", Toast.LENGTH_SHORT).show();
} else{  name = addTxtName.getText().toString();
}
if (addTxtNumber.getText().toString().equals("")){
Toast.makeText(MainActivity.this, "Please add valid contact number", Toast.LENGTH_SHORT).show();
} else { number = addTxtNumber.getText().toString();
}
list.add(new ContactModel(name, number));
adapter.notifyItemInserted(list.size() - 1);
recyclerView.scrollToPosition(list.size() - 1);
dialog.dismiss();
}
});
dialog.show();
}
});

initList();

}
private void initList() {
list.add(new ContactModel(R.drawable.a, "Kalyan","9875410316"));
list.add(new ContactModel(R.drawable.b, "Uttam","9083080056"));
list.add(new ContactModel(R.drawable.c, "Bulu","8583020544"));
list.add(new ContactModel(R.drawable.d, "Pampa","9999999999"));
list.add(new ContactModel(R.drawable.a, "Kalyan","9875410316"));
list.add(new ContactModel(R.drawable.b, "Uttam","9083080056"));
list.add(new ContactModel(R.drawable.c, "Bulu","8583020544"));
list.add(new ContactModel(R.drawable.d, "Pampa","9999999999"));

adapter = new ContactRecyclerAdapter(this, list);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
}

自定义对话框的布局文件是-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="300dp"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:gravity="center_vertical"
android:background="@color/teal_700">
<TextView
android:layout_width="270dp"
android:layout_height="3dp"
android:background="@color/black"
android:layout_gravity="center"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/add_new_contact"
android:gravity="center"
android:textSize="30sp"
android:textStyle="bold"
android:textColor="@color/white"/>
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:cardCornerRadius="7dp"
android:layout_margin="5dp"
app:cardBackgroundColor="@color/teal_200">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_vertical"
android:id="@+id/llRow"
android:padding="11dp">
<androidx.cardview.widget.CardView
android:layout_width="100dp"
android:layout_height="100dp"
app:cardCornerRadius="50dp">
<ImageView
android:id="@+id/addImgContact"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="@string/contact_image"
android:src="@drawable/ic_user"
android:background="@color/white"
/>
</androidx.cardview.widget.CardView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="11dp"
android:orientation="vertical"
tools:ignore="UselessLeaf"
android:background="@color/white">
<EditText
android:id="@+id/addTxtName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/contact"
android:textSize="18sp"
android:textStyle="bold"
android:textColor="@color/material_dynamic_primary40"
android:textColorHint="@color/black"
android:layout_marginBottom="3dp"
android:background="@color/white"
android:inputType="text"
android:padding="3dp"
android:autofillHints="name" />
<EditText
android:id="@+id/addTxtNumber"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/contact_number"
android:textSize="16sp"
android:textStyle="bold"
android:textColor="@color/white"
android:textColorHint="@color/white"
android:padding="3dp"
android:background="@color/material_dynamic_neutral30"
android:inputType="number"
android:autofillHints="phone" />
</LinearLayout>
</LinearLayout>
</androidx.cardview.widget.CardView>
<Button
android:id="@+id/problmBtn"
android:layout_width="280dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="@string/add_new_contact"
android:textStyle="bold"
android:backgroundTint="@color/material_dynamic_primary20"
android:layout_marginBottom="10dp"
/>
<TextView
android:layout_width="310dp"
android:layout_height="3dp"
android:background="@color/white"
android:layout_gravity="center"/>
</LinearLayout>

Answer 1

它肯定会始终向recyclyerview添加项，因为您没有包含

list.add(new ContactModel(name, number));
adapter.notifyItemInserted(list.size() - 1);
recyclerView.scrollToPosition(list.size() - 1);

这段代码在任何条件下，你需要检查如果名称和联系人不是空的只有这个代码应该运行，你还需要改善你的if/else条件更好的吐司消息。