如何在Android Studio中单击按钮时从LinearLayout中添加和删除CardView？

Question

我有一个线性布局，其中包含cardView。我想在单击按钮时动态添加和删除cardViews。我已经尝试了以下代码，但是删除按钮在添加新的动态填充视图更改后仍然无法正常工作，如下图所示。

ExperienceInfoActivity.java

package kbg.com.kbgpos.forms;
import android.app.DatePickerDialog;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.CardView;
import android.support.v7.widget.Toolbar;
import android.text.format.Time;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;

import kbg.com.kbgpos.R;

public class ExperienceInfoActivity extends AppCompatActivity {
    Toolbar toolbar;
    private LinearLayout parentRelativeLayout;
    private View v;
    EditText fromDateEditText,toDateEditText;
    private ViewGroup.LayoutParams params;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_experience_info);
        initViews();
        initListeners();
    }


    private void initViews() {
        toolbar=(Toolbar) findViewById(R.id.toolbarExperienceInfoActivity);
        toolbar.setTitle("Employee Experience Info");
        toolbar.setTitleTextColor(getResources().getColor(R.color.toolBarTitle));
        toolbar.setNavigationIcon(getResources().getDrawable(R.drawable.ic_arrow_back_black_24dp));
        setSupportActionBar(toolbar);

        parentRelativeLayout = (LinearLayout) findViewById(R.id.experienceDetailsInfoRelLayout);
        CardView experienceInfoActivityFormCardVw = findViewById(R.id.experienceInfoActivityFormCardVw);
        ImageView delRowBtn = findViewById(R.id.delRowBtn);
        delRowBtn.setTag(experienceInfoActivityFormCardVw);
        params = experienceInfoActivityFormCardVw.getLayoutParams();
        fromDateEditText=(EditText)findViewById(R.id.fromDateEditText);
        toDateEditText=(EditText)findViewById(R.id.toDateEditText);
    }

    private void initListeners() {
        fromDateEditText.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if(event.getAction() == MotionEvent.ACTION_UP) {
                    if(event.getRawX() >= fromDateEditText.getRight() - fromDateEditText.getTotalPaddingRight()) {
                        DatePickerDialog.OnDateSetListener dpd = new DatePickerDialog.OnDateSetListener() {
                            @Override
                            public void onDateSet(DatePicker view, int year, int monthOfYear,
                                                  int dayOfMonth) {

                                int s=monthOfYear+1;
                                String a = dayOfMonth+"/"+s+"/"+year;
                                fromDateEditText.setText(""+a);
                            }
                        };

                        Time date = new Time();
                        DatePickerDialog d = new DatePickerDialog(ExperienceInfoActivity.this, dpd, date.year ,date.month, date.monthDay);
                        d.show();

                        return true;
                    }
                }
                return true;
            }
        });

        toDateEditText.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if(event.getAction() == MotionEvent.ACTION_UP) {
                    if(event.getRawX() >= toDateEditText.getRight() - toDateEditText.getTotalPaddingRight()) {
                        DatePickerDialog.OnDateSetListener dpd = new DatePickerDialog.OnDateSetListener() {
                            @Override
                            public void onDateSet(DatePicker view, int year, int monthOfYear,
                                                  int dayOfMonth) {

                                int s=monthOfYear+1;
                                String a = dayOfMonth+"/"+s+"/"+year;
                                toDateEditText.setText(""+a);
                            }
                        };

                        Time date = new Time();
                        DatePickerDialog d = new DatePickerDialog(ExperienceInfoActivity.this, dpd, date.year ,date.month, date.monthDay);
                        d.show();

                        return true;
                    }
                }
                return true;
            }
        });
    }

    public void onAddField(View view) {
        try{

            LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            final View rowView = inflater.inflate(R.layout.experience_details_row, null);
            if(parentRelativeLayout.getChildCount()>1){
                ViewGroup parent = (ViewGroup) view.getParent();
                parent.removeView(view);
            }
            ImageView delRowBtn = rowView.findViewById(R.id.delRowBtn);
            delRowBtn.setTag(rowView);
            rowView.setLayoutParams(params);
            parentRelativeLayout.addView(rowView, parentRelativeLayout.getChildCount());
            EditText employerNameEditText = rowView.findViewById(R.id.employerNameEditText);
            employerNameEditText.requestFocus();
        }catch (Exception e){
            e.printStackTrace();
        }
    }
    public void onDelete(View v) {
        try{
            if(parentRelativeLayout.getChildCount()>2) {
                CardView cv = (CardView) ((ImageView) v).getTag();
                parentRelativeLayout.removeView(cv);
            }else{
                ViewGroup parent = (ViewGroup) v.getParent();
                v.setBackgroundColor(getResources().getColor(R.color.material_grey_50));
            }
        }catch (Exception e){
            e.printStackTrace();
        }
    }

}

experience_details_row.xml

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:id="@+id/experienceInfoActivityFormCardVw"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp"
        android:layout_marginRight="5dp"
        android:layout_marginBottom="5dp"
        android:layout_marginTop="5dp"
        card_view:cardElevation="2dp"
        card_view:contentPadding="5dp"
        card_view:cardCornerRadius="2dp">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <android.support.design.widget.TextInputLayout
                android:id="@+id/employerNameTextInputLayout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:hintTextAppearance="@style/text_in_layout_hint_Style"
                app:errorTextAppearance="@style/text_in_layout_error_hint_Style">
                <EditText
                    android:id="@+id/employerNameEditText"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:ems="10"
                    android:textSize="12sp"
                    android:inputType="textPersonName"
                    android:hint="Employer Name" />
            </android.support.design.widget.TextInputLayout>

            <android.support.design.widget.TextInputLayout
                android:id="@+id/designationTextInputLayout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                app:hintTextAppearance="@style/text_in_layout_hint_Style"
                app:errorTextAppearance="@style/text_in_layout_error_hint_Style"
                android:layout_below="@id/employerNameTextInputLayout">
                <EditText
                    android:id="@+id/designationEditText"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:ems="10"
                    android:textSize="12sp"
                    android:inputType="textPersonName"
                    android:hint="Designation" />
            </android.support.design.widget.TextInputLayout>

            <android.support.design.widget.TextInputLayout
                android:id="@+id/addressTextInputLayout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                app:hintTextAppearance="@style/text_in_layout_hint_Style"
                app:errorTextAppearance="@style/text_in_layout_error_hint_Style"
                android:layout_below="@id/designationTextInputLayout">
                <EditText
                    android:id="@+id/addressEditText"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:ems="10"
                    android:textSize="12sp"
                    android:inputType="textPersonName"
                    android:hint="Address" />
            </android.support.design.widget.TextInputLayout>

            <android.support.design.widget.TextInputLayout
                android:id="@+id/fromDateTextInputLayout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                app:hintTextAppearance="@style/text_in_layout_hint_Style"
                app:errorTextAppearance="@style/text_in_layout_error_hint_Style"
                android:layout_below="@id/addressTextInputLayout">
                <EditText
                    android:id="@+id/fromDateEditText"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:textSize="12sp"
                    android:inputType="date"
                    android:drawableRight="@drawable/ic_perm_contact_calendar_black_24dp"
                    android:drawableTint="@android:color/holo_orange_light"
                    android:hint="From Date" />
            </android.support.design.widget.TextInputLayout>

            <android.support.design.widget.TextInputLayout
                android:id="@+id/toDateTextInputLayout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                app:hintTextAppearance="@style/text_in_layout_hint_Style"
                app:errorTextAppearance="@style/text_in_layout_error_hint_Style"
                android:layout_below="@id/fromDateTextInputLayout">
                <EditText
                    android:id="@+id/toDateEditText"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:textSize="12sp"
                    android:inputType="date"
                    android:hint="To Date"
                    android:drawableRight="@drawable/ic_perm_contact_calendar_black_24dp"
                    android:drawableTint="@android:color/holo_orange_light"/>
            </android.support.design.widget.TextInputLayout>
            <LinearLayout
                android:id="@+id/addDelLayout"
                android:layout_marginTop="5dp"
                android:padding="5dp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="left"
                android:orientation="horizontal"
                android:layout_below="@id/toDateTextInputLayout">
                <ImageView
                    android:id="@+id/addRowBtn"
                    android:src="@drawable/ic_add_box_black_24dp"
                    android:layout_width="40dp"
                    android:layout_height="30dp"
                    android:onClick="onAddField"
                    android:background="@android:color/holo_green_light"
                    android:layout_marginRight="30dp"/>
                <ImageView
                    android:id="@+id/delRowBtn"
                    android:src="@drawable/ic_delete_black_24dp"
                    android:background="@android:color/holo_red_dark"
                    android:layout_width="40dp"
                    android:layout_height="30dp"
                    android:onClick="onDelete"/>
            </LinearLayout>
        </RelativeLayout>
    </android.support.v7.widget.CardView>

activity_experience_info.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".forms.ExperienceInfoActivity">

    <include
        android:layout_height="wrap_content"
        android:layout_width="match_parent"
        layout="@layout/toolbar_layout"
        android:id="@+id/toolbarExperienceInfoActivity"></include>

    <ScrollView
        android:id="@+id/personalDetailScroll"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:fillViewport="true"
        android:layout_marginBottom="55dp"
        android:scrollbars = "vertical"
        android:layout_below="@id/toolbarExperienceInfoActivity">

        <LinearLayout
            android:id="@+id/experienceDetailsInfoRelLayout"
            android:padding="5dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">
        <android.support.v7.widget.CardView
            android:id="@+id/experienceInfoActivityFormHeadingCardVw"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:layout_marginRight="5dp"
            android:layout_marginBottom="5dp"
            android:layout_marginTop="10dp"
            card_view:cardElevation="2dp"
            card_view:contentPadding="5dp"
            card_view:cardCornerRadius="2dp"
            app:cardBackgroundColor="@android:color/holo_orange_light">
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Experience Details"
                android:textStyle="bold"
                android:textColor="@android:color/white"
                android:layout_gravity="center"/>
        </android.support.v7.widget.CardView>
            <android.support.v7.widget.CardView
                android:id="@+id/experienceInfoActivityFormCardVw"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_marginBottom="5dp"
                android:layout_marginTop="5dp"
                card_view:cardElevation="2dp"
                card_view:contentPadding="5dp"
                card_view:cardCornerRadius="2dp">

                <RelativeLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">

                    <android.support.design.widget.TextInputLayout
                        android:id="@+id/employerNameTextInputLayout"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        app:hintTextAppearance="@style/text_in_layout_hint_Style"
                        app:errorTextAppearance="@style/text_in_layout_error_hint_Style">
                        <EditText
                            android:id="@+id/employerNameEditText"
                            android:layout_width="match_parent"
                            android:layout_height="match_parent"
                            android:ems="10"
                            android:textSize="12sp"
                            android:inputType="textPersonName"
                            android:hint="Employer Name" />
                    </android.support.design.widget.TextInputLayout>

                    <android.support.design.widget.TextInputLayout
                        android:id="@+id/designationTextInputLayout"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginTop="10dp"
                        app:hintTextAppearance="@style/text_in_layout_hint_Style"
                        app:errorTextAppearance="@style/text_in_layout_error_hint_Style"
                        android:layout_below="@id/employerNameTextInputLayout">
                        <EditText
                            android:id="@+id/designationEditText"
                            android:layout_width="match_parent"
                            android:layout_height="match_parent"
                            android:ems="10"
                            android:textSize="12sp"
                            android:inputType="textPersonName"
                            android:hint="Designation" />
                    </android.support.design.widget.TextInputLayout>

                    <android.support.design.widget.TextInputLayout
                        android:id="@+id/addressTextInputLayout"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginTop="10dp"
                        app:hintTextAppearance="@style/text_in_layout_hint_Style"
                        app:errorTextAppearance="@style/text_in_layout_error_hint_Style"
                        android:layout_below="@id/designationTextInputLayout">
                        <EditText
                            android:id="@+id/addressEditText"
                            android:layout_width="match_parent"
                            android:layout_height="match_parent"
                            android:ems="10"
                            android:textSize="12sp"
                            android:inputType="textPersonName"
                            android:hint="Address" />
                    </android.support.design.widget.TextInputLayout>

                    <android.support.design.widget.TextInputLayout
                        android:id="@+id/fromDateTextInputLayout"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginTop="10dp"
                        app:hintTextAppearance="@style/text_in_layout_hint_Style"
                        app:errorTextAppearance="@style/text_in_layout_error_hint_Style"
                        android:layout_below="@id/addressTextInputLayout">
                        <EditText
                            android:id="@+id/fromDateEditText"
                            android:layout_width="match_parent"
                            android:layout_height="match_parent"
                            android:textSize="12sp"
                            android:inputType="date"
                            android:drawableRight="@drawable/ic_perm_contact_calendar_black_24dp"
                            android:drawableTint="@android:color/holo_orange_light"
                            android:hint="From Date" />
                    </android.support.design.widget.TextInputLayout>

                    <android.support.design.widget.TextInputLayout
                        android:id="@+id/toDateTextInputLayout"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginTop="10dp"
                        app:hintTextAppearance="@style/text_in_layout_hint_Style"
                        app:errorTextAppearance="@style/text_in_layout_error_hint_Style"
                        android:layout_below="@id/fromDateTextInputLayout">
                        <EditText
                            android:id="@+id/toDateEditText"
                            android:layout_width="match_parent"
                            android:layout_height="match_parent"
                            android:textSize="12sp"
                            android:inputType="date"
                            android:hint="To Date"
                            android:drawableRight="@drawable/ic_perm_contact_calendar_black_24dp"
                            android:drawableTint="@android:color/holo_orange_light"/>
                    </android.support.design.widget.TextInputLayout>
                    <LinearLayout
                        android:id="@+id/addDelLayout"
                        android:layout_marginTop="5dp"
                        android:padding="5dp"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:gravity="left"
                        android:orientation="horizontal"
                        android:layout_below="@id/toDateTextInputLayout">
                        <ImageView
                            android:id="@+id/addRowBtn"
                            android:src="@drawable/ic_add_box_black_24dp"
                            android:layout_width="40dp"
                            android:layout_height="30dp"
                            android:onClick="onAddField"
                            android:background="@android:color/holo_green_light"
                            android:layout_marginRight="30dp"/>
                        <ImageView
                            android:id="@+id/delRowBtn"
                            android:src="@drawable/ic_delete_black_24dp"
                            android:background="@android:color/holo_red_dark"
                            android:layout_width="40dp"
                            android:layout_height="30dp"
                            android:onClick="onDelete"/>
                    </LinearLayout>
                </RelativeLayout>
            </android.support.v7.widget.CardView>
        </LinearLayout>

    </ScrollView>

    <LinearLayout
        android:layout_alignParentBottom="true"
        android:elevation="4dp"
        android:layout_width="match_parent"
        android:layout_height="55dp"
        android:padding="5dp"
        android:weightSum="2"
        android:orientation="horizontal"
        android:gravity="center">

        <Button
            android:id="@+id/cancelBtn"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="45dp"
            android:text="CANCEL"
            android:background="#e0e0e0"
            android:textStyle="bold"
            android:textColor="@android:color/white"/>
        <Button
            android:id="@+id/saveBtn"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="45dp"
            android:text="SUBMIT"
            android:background="#ffe57f"
            android:textStyle="bold"
            android:textColor="@android:color/white"/>
    </LinearLayout>
</RelativeLayout>

请帮助我，我是新手，我将不胜感激。

Answer 1

v中的参数onDelete(View v)不是您要删除的CardView。
这就是您单击的ImageView。
在onAddField()中执行以下操作：

LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View rowView = inflater.inflate(R.layout.experience_details_row, null);
ImageView delRowBtn = rowView.findViewById(R.id.delRowBtn);
delRowBtn.setTag(rowView);
parentRelativeLayout.addView(rowView, parentRelativeLayout.getChildCount());

上面的代码所做的是将新的CardView对象存储在delRowBtn的标签中。
我还从-1中删除了parentRelativeLayout.getChildCount()，最后添加了新的CardView。
但是上述逻辑也必须应用于已经存在的第一个CardView，因此在onCreate()中添加以下内容：

CardView experienceInfoActivityFormCardVw = findViewById(R.id.experienceInfoActivityFormCardVw);
ImageView delRowBtn = findViewById(R.id.delRowBtn);
delRowBtn.setTag(experienceInfoActivityFormCardVw);

在onDelete()中执行以下操作：

CardView cv = (CardView) ((ImageView) v).getTag();
parentRelativeLayout.removeView(cv);

上面的代码所做的是从CardView的标签中检索delRowBtn对象，并将其从parentRelativeLayout中删除。

您的活动的完整代码：

import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.CardView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class ExperienceInfoActivity extends AppCompatActivity {
    Toolbar toolbar;
    private LinearLayout parentRelativeLayout;
    private ViewGroup.LayoutParams params;
    private int count = 1;

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

        CardView experienceInfoActivityFormCardVw = findViewById(R.id.experienceInfoActivityFormCardVw);
        ImageView delRowBtn = findViewById(R.id.delRowBtn);
        delRowBtn.setTag(experienceInfoActivityFormCardVw);
        params = experienceInfoActivityFormCardVw.getLayoutParams();

        initViews();
        initListeners();
    }

    private void initListeners() {

    }

    private void initViews() {
        toolbar=(Toolbar) findViewById(R.id.toolbarExperienceInfoActivity);
        toolbar.setTitle("Employee Experience Info");
        toolbar.setTitleTextColor(getResources().getColor(R.color.toolBarTitle));
        toolbar.setNavigationIcon(getResources().getDrawable(R.drawable.ic_arrow_back_black_24dp));
        setSupportActionBar(toolbar);

        parentRelativeLayout = (LinearLayout) findViewById(R.id.experienceDetailsInfoRelLayout);
    }

    public void onAddField(View view) {
        try{
            LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            final View rowView = inflater.inflate(R.layout.experience_details_row, null);
            ImageView delRowBtn = rowView.findViewById(R.id.delRowBtn);
            delRowBtn.setTag(rowView);
            rowView.setLayoutParams(params);
            parentRelativeLayout.addView(rowView, parentRelativeLayout.getChildCount());
            EditText employerNameEditText = rowView.findViewById(R.id.employerNameEditText);
            employerNameEditText.requestFocus();
            count++;
        }catch (Exception e){
            e.printStackTrace();
        }
    }
    public void onDelete(View v) {
        try{
            if (count == 1) return;
            CardView cv = (CardView) ((ImageView) v).getTag();
            parentRelativeLayout.removeView(cv);
            count--;

        }catch (Exception e){
            e.printStackTrace();
        }
    }
}