如何区分动态创建的edittext和在动态创建的edittext上实现onclick监听器？

Question

appI预览希望区分我通过单击按钮创建的edittext，并在特定的edittext上实现onclick侦听器
。

public class MainActivity extends AppCompatActivity
{
    private LinearLayout parentLinearLayout;
    EditText number;
    View rowView;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        number = rowView.findViewById(R.id.number_edit_text);
        parentLinearLayout = (LinearLayout) findViewById(R.id.parent_linear_layout);
    }
    public void onAddField(View v)
    {
        LayoutInflater inflater=(LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        rowView=inflater.inflate(R.layout.field, null);
        // Add the new row before the add field button.
        parentLinearLayout.addView(rowView, parentLinearLayout.getChildCount() - 1);
    }
    public void onDelete(View v)
    {
        parentLinearLayout.removeView((View) v.getParent());
    }
}

Answer 1

我认为您希望访问RowView的edittext。如果是这样，在添加新行时，您可以为该行设置id，稍后您可以使用该id访问所需行，或者可以通过创建列表并将行添加到列表中，并且无论何时您想访问所需行，都可以通过列表及其位置来访问。访问行的视图后，可以使用它们自己的ID访问子视图(EditText、Spinner和ImageView（或Button))。

考虑以下布局是您的布局（您没有共享您的布局，所以我创建了类似的布局）。

activity_main.xml

<?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:id="@+id/parent_linear_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginStart="5dp"
    android:layout_marginEnd="5dp"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="onAddField"
        android:layout_gravity="center"
        android:text="Add" />
</LinearLayout>

field.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"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <EditText
        android:id="@+id/row_edit_text"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toStartOf="@id/row_spinner"
        app:layout_constraintTop_toTopOf="parent"/>
    <Spinner
        android:id="@+id/row_spinner"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toStartOf="@id/row_remove"
        app:layout_constraintTop_toTopOf="@id/row_edit_text"
        app:layout_constraintBottom_toBottomOf="@id/row_edit_text"/>
    
    <ImageView
        android:id="@+id/row_remove"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_close"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="@id/row_edit_text"
        app:layout_constraintBottom_toBottomOf="@id/row_edit_text"/>

</androidx.constraintlayout.widget.ConstraintLayout>

第一个选项：为每一行设置id并使用该id访问行。获取行后，您可以使用它自己的ID获取子视图的。

mainactivity.java

 public class MainActivity extends AppCompatActivity {

    private LinearLayout parentLinearLayout;

    //Variable for id and assign it to 0
    int id = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        parentLinearLayout = findViewById(R.id.parent_linear_layout);
    }

    public void onAddField(View view) {
        View v = getLayoutInflater().inflate(R.layout.field, null);

        //Set id for new row
        v.setId(id);

        //Access your ImageView (or Button-I added as ImageView) and set ClickListener 
        // for removing current row with this ImageView (or Button)
        ImageView img = v.findViewById(R.id.row_remove);
        img.setOnClickListener(v1 -> parentLinearLayout.removeView(v));

        //Add your view into the parent layout
        parentLinearLayout.addView(v, parentLinearLayout.getChildCount() - 1);

        //Increase id so every added row will have different id
        id++;
    }

    //This method will return row's EditText. id is the same id which we set while adding
    // new row (don't forget it starts with 0)
    private EditText getRowEditText(int id){
        //Get row's view with its id
        View v = findViewById(id);
        //Access row's EditText
        return v.findViewById(R.id.row_edit_text);
    }

    ////This method will return row's Spinner
    private Spinner getRowSpinner(int id){
        //Get row's view with its id
        View v = findViewById(id);
        //Access row's Spinner
        return v.findViewById(R.id.row_spinner);
    }
}

第二个选项：创建列表并且每当您创建一个新行时，也将该行添加到列表中（使用此选项，您不需要使用id）。

public class MainActivity extends AppCompatActivity {

    private LinearLayout parentLinearLayout;
    private List<View> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        parentLinearLayout = findViewById(R.id.parent_linear_layout);
        list = new ArrayList<>();
    }

    public void onAddField(View view) {
        View v = getLayoutInflater().inflate(R.layout.field, null);

        ImageView img = v.findViewById(R.id.row_remove);
        img.setOnClickListener(v1 -> parentLinearLayout.removeView(v));

        parentLinearLayout.addView(v, parentLinearLayout.getChildCount() - 1);

        //Add current row into the list
        list.add(v);
    }

    private EditText getRowEditText(int position){
        //Get row's view with its position
        View v = list.get(position);
        //Return row's EditText
        return v.findViewById(R.id.row_edit_text);
    }

    private Spinner getRowSpinner(int position){
        //Get row's view with its position
        View v = list.get(position);
        //Return row's EditText
        return v.findViewById(R.id.row_spinner);
    }
}