在 Android 中动态添加和删除视图？

小开

您可以尝试这种方式添加相对布局，然后添加文本视图。

LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
(LayoutParams.WRAP_CONTENT), (LayoutParams.WRAP_CONTENT));


RelativeLayout relative = new RelativeLayout(getApplicationContext());
relative.setLayoutParams(lp);


TextView tv = new TextView(getApplicationContext());
tv.setLayoutParams(lp);


EditText edittv = new EditText(getApplicationContext());
edittv.setLayoutParams(lp);


relative.addView(tv);
relative.addView(edittv);

小开

ViewGroup 类在运行时为子视图管理提供 API，也允许添加/删除视图。

关于这一主题的其他一些链接:

Android，添加没有 XML 布局的新视图

Android 运行时布局教程

Http://developer.android.com/reference/android/view/view.html

Http://developer.android.com/reference/android/widget/linearlayout.html

小开

最佳答案

ViewParent通常不能删除视图，但是 ViewGroup可以。你需要将你的父母强制转换成一个 ViewGroup(如果它是一个 ViewGroup)来完成你想要的。

例如:

View namebar = View.findViewById(R.id.namebar);
((ViewGroup) namebar.getParent()).removeView(namebar);

注意，所有的 Layout都是 ViewGroup。

小开

我需要在这个问题中描述的完全相同的特征。这是我的解决方案和源代码: https://github.com/laoyang/android-dynamic-views。你可以在这里看到视频演示: http://www.youtube.com/watch?v=4HeqyG6FDhQ

布局

基本上，您将使用两个 xml 布局文件:

带有 TextEdit、 Spinner和 ImageButton用于删除的水平 LinearLayout 行视图。
只有一个 添加新的按钮的垂直线性布局 集装箱视图。

控制

在 Java 代码中，您将动态地将行视图添加和移除到容器中，使用充气、 addView、 RemoveView 等。有一些可见性控制，更好的用户体验在股票 Android 应用程序。您需要在每一行的 EditText 视图中添加一个 TextWatcher: 当文本为空时，您需要隐藏 添加新的按钮和删除按钮。在我的代码中，我为所有逻辑编写了一个 void inflateEditRow(String)助手函数。

其他把戏

在 xml 中设置 android:animateLayoutChanges="true"以启用动画
使用自定义的透明背景与按下选择器，使按钮视觉上相同的股票 Android 应用程序。

源代码

主要活动的 Java 代码(这解释了所有的逻辑，但是有相当多的属性是在 xml 布局文件中设置的，请参考 Github 源代码获得完整的解决方案) :

public class MainActivity extends Activity {
// Parent view for all rows and the add button.
private LinearLayout mContainerView;
// The "Add new" button
private Button mAddButton;
// There always should be only one empty row, other empty rows will
// be removed.
private View mExclusiveEmptyView;


@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.row_container);
mContainerView = (LinearLayout) findViewById(R.id.parentView);
mAddButton = (Button) findViewById(R.id.btnAddNewItem);


// Add some examples
inflateEditRow("Xiaochao");
inflateEditRow("Yang");
}


// onClick handler for the "Add new" button;
public void onAddNewClicked(View v) {
// Inflate a new row and hide the button self.
inflateEditRow(null);
v.setVisibility(View.GONE);
}


// onClick handler for the "X" button of each row
public void onDeleteClicked(View v) {
// remove the row by calling the getParent on button
mContainerView.removeView((View) v.getParent());
}


// Helper for inflating a row
private void inflateEditRow(String name) {
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View rowView = inflater.inflate(R.layout.row, null);
final ImageButton deleteButton = (ImageButton) rowView
.findViewById(R.id.buttonDelete);
final EditText editText = (EditText) rowView
.findViewById(R.id.editText);
if (name != null && !name.isEmpty()) {
editText.setText(name);
} else {
mExclusiveEmptyView = rowView;
deleteButton.setVisibility(View.INVISIBLE);
}


// A TextWatcher to control the visibility of the "Add new" button and
// handle the exclusive empty view.
editText.addTextChangedListener(new TextWatcher() {


@Override
public void afterTextChanged(Editable s) {


// Some visibility logic control here:
if (s.toString().isEmpty()) {
mAddButton.setVisibility(View.GONE);
deleteButton.setVisibility(View.INVISIBLE);
if (mExclusiveEmptyView != null
&& mExclusiveEmptyView != rowView) {
mContainerView.removeView(mExclusiveEmptyView);
}
mExclusiveEmptyView = rowView;
} else {
if (mExclusiveEmptyView == rowView) {
mExclusiveEmptyView = null;
}
mAddButton.setVisibility(View.VISIBLE);
deleteButton.setVisibility(View.VISIBLE);
}
}


@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}


@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
}
});


// Inflate at the end of all rows but before the "Add new" button
mContainerView.addView(rowView, mContainerView.getChildCount() - 1);
}

小开

//MainActivity :










package com.edittext.demo;
import android.app.Activity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Toast;


public class MainActivity extends Activity {


private EditText edtText;
private LinearLayout LinearMain;
private Button btnAdd, btnClear;
private int no;


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


edtText = (EditText)findViewById(R.id.edtMain);
btnAdd = (Button)findViewById(R.id.btnAdd);
btnClear = (Button)findViewById(R.id.btnClear);
LinearMain = (LinearLayout)findViewById(R.id.LinearMain);


btnAdd.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (!TextUtils.isEmpty(edtText.getText().toString().trim())) {
no = Integer.parseInt(edtText.getText().toString());
CreateEdittext();
}else {
Toast.makeText(MainActivity.this, "Please entere value", Toast.LENGTH_SHORT).show();
}
}
});


btnClear.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
LinearMain.removeAllViews();
edtText.setText("");
}
});


/*edtText.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {


}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,int after) {
}
@Override
public void afterTextChanged(Editable s) {
}
});*/


}


protected void CreateEdittext() {
final EditText[] text = new EditText[no];
final Button[] add = new Button[no];
final LinearLayout[] LinearChild = new LinearLayout[no];
LinearMain.removeAllViews();


for (int i = 0; i < no; i++){


View view = getLayoutInflater().inflate(R.layout.edit_text, LinearMain,false);
text[i] = (EditText)view.findViewById(R.id.edtText);
text[i].setId(i);
text[i].setTag(""+i);


add[i] = (Button)view.findViewById(R.id.btnAdd);
add[i].setId(i);
add[i].setTag(""+i);


LinearChild[i] = (LinearLayout)view.findViewById(R.id.child_linear);
LinearChild[i].setId(i);
LinearChild[i].setTag(""+i);


LinearMain.addView(view);


add[i].setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//Toast.makeText(MainActivity.this, "add text "+v.getTag(), Toast.LENGTH_SHORT).show();
int a = Integer.parseInt(text[v.getId()].getText().toString());
LinearChild[v.getId()].removeAllViews();
for (int k = 0; k < a; k++){


EditText text = (EditText) new EditText(MainActivity.this);
text.setId(k);
text.setTag(""+k);


LinearChild[v.getId()].addView(text);
}
}
});
}
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}


}

//现在添加 xml main

<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="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >


<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:orientation="horizontal" >


<EditText
android:id="@+id/edtMain"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_weight="1"
android:ems="10"
android:hint="Enter value" >


<requestFocus />
</EditText>


<Button
android:id="@+id/btnAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="Add" />


<Button
android:id="@+id/btnClear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:text="Clear" />
</LinearLayout>


<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="10dp" >


<LinearLayout
android:id="@+id/LinearMain"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
</LinearLayout>
</ScrollView>

//现在添加视图 xml 文件. 。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >


<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:orientation="horizontal" >


<EditText
android:id="@+id/edtText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:ems="10" />


<Button
android:id="@+id/btnAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="Add" />
</LinearLayout>


<LinearLayout
android:id="@+id/child_linear"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="30dp"
android:layout_marginRight="10dp"
android:layout_marginTop="5dp"
android:orientation="vertical" >
</LinearLayout>

小开

这是我的一般方法:

View namebar = view.findViewById(R.id.namebar);
ViewGroup parent = (ViewGroup) namebar.getParent();
if (parent != null) {
parent.removeView(namebar);
}

小开

只要使用 myView.setVisibility(View.GONE);完全删除它。但是，如果您想保留其父节点内的占用空间，请使用 myView.setVisibility(View.INVISIBLE);

小开

用于添加按钮

LinearLayout dynamicview = (LinearLayout)findViewById(R.id.buttonlayout);
LinearLayout.LayoutParams  lprams = new LinearLayout.LayoutParams(  LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);


Button btn = new Button(this);
btn.setId(count);
final int id_ = btn.getId();
btn.setText("Capture Image" + id_);
btn.setTextColor(Color.WHITE);
btn.setBackgroundColor(Color.rgb(70, 80, 90));
dynamicview.addView(btn, lprams);
btn = ((Button) findViewById(id_));
btn.setOnClickListener(this);

解除按钮

ViewGroup layout = (ViewGroup) findViewById(R.id.buttonlayout);
View command = layout.findViewById(count);
layout.removeView(command);

小开

首先写活动类。下面的类有一个类别名称和一个小的添加按钮。当您按下 add (+)按钮时，它会添加新行，其中包含一个 EditText 和一个 ImageButton，后者执行删除该行。

package com.blmsr.manager;


import android.app.Activity;
import android.app.ListActivity;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.ScrollView;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;


import com.blmsr.manager.R;
import com.blmsr.manager.dao.CategoryService;
import com.blmsr.manager.models.CategoryModel;
import com.blmsr.manager.service.DatabaseService;


public class CategoryEditorActivity extends Activity {
private final String CLASSNAME = "CategoryEditorActivity";
LinearLayout itsLinearLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_category_editor);


itsLinearLayout = (LinearLayout)findViewById(R.id.linearLayout2);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_category_editor, menu);
return true;
}


@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
switch (item.getItemId()) {
case R.id.action_delete:
deleteCategory();
return true;
case R.id.action_save:
saveCategory();
return true;
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}


/**
* Adds a new row which contains the EditText and a delete button.
* @param theView
*/
public void addField(View theView)
{
itsLinearLayout.addView(tableLayout(), itsLinearLayout.getChildCount()-1);
}


// Using a TableLayout as it provides you with a neat ordering structure


private TableLayout tableLayout() {
TableLayout tableLayout = new TableLayout(this);
tableLayout.addView(createRowView());
return tableLayout;
}


private TableRow createRowView() {
TableRow tableRow = new TableRow(this);
tableRow.setPadding(0, 10, 0, 0);


EditText editText = new EditText(this);
editText.setWidth(600);
editText.requestFocus();


tableRow.addView(editText);
ImageButton btnGreen = new ImageButton(this);
btnGreen.setImageResource(R.drawable.ic_delete);
btnGreen.setBackgroundColor(Color.TRANSPARENT);
btnGreen.setOnClickListener(anImageButtonListener);
tableRow.addView(btnGreen);


return tableRow;
}


/**
* Delete the row when clicked on the remove button.
*/
private View.OnClickListener anImageButtonListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
TableRow anTableRow = (TableRow)v.getParent();
TableLayout anTable = (TableLayout) anTableRow.getParent();
itsLinearLayout.removeView(anTable);


}
};


/**
* Save the values to db.
*/
private void saveCategory()
{
CategoryService aCategoryService = DatabaseService.getInstance(this).getCategoryService();
aCategoryService.save(getModel());
Log.d(CLASSNAME, "successfully saved model");


Intent anIntent = new Intent(this, CategoriesListActivity.class);
startActivity(anIntent);


}


/**
* performs the delete.
*/
private void deleteCategory()
{


}


/**
* Returns the model object. It gets the values from the EditText views and sets to the model.
* @return
*/
private CategoryModel getModel()
{
CategoryModel aCategoryModel = new CategoryModel();
try
{
EditText anCategoryNameEditText = (EditText) findViewById(R.id.categoryNameEditText);
aCategoryModel.setCategoryName(anCategoryNameEditText.getText().toString());
for(int i= 0; i< itsLinearLayout.getChildCount(); i++)
{
View aTableLayOutView = itsLinearLayout.getChildAt(i);
if(aTableLayOutView instanceof  TableLayout)
{
for(int j= 0; j< ((TableLayout) aTableLayOutView).getChildCount() ; j++ );
{
TableRow anTableRow = (TableRow) ((TableLayout) aTableLayOutView).getChildAt(i);
EditText anEditText =  (EditText) anTableRow.getChildAt(0);
if(StringUtils.isNullOrEmpty(anEditText.getText().toString()))
{
// show a validation message.
//return aCategoryModel;
}


setValuesToModel(aCategoryModel, i + 1, anEditText.getText().toString());
}
}
}
}
catch (Exception anException)
{
Log.d(CLASSNAME, "Exception occured"+anException);
}


return aCategoryModel;
}


/**
* Sets the value to model.
* @param theModel
* @param theFieldIndexNumber
* @param theFieldValue
*/
private void setValuesToModel(CategoryModel theModel, int theFieldIndexNumber, String theFieldValue)
{
switch (theFieldIndexNumber)
{
case 1 :
theModel.setField1(theFieldValue);
break;
case 2 :
theModel.setField2(theFieldValue);
break;
case 3 :
theModel.setField3(theFieldValue);
break;
case 4 :
theModel.setField4(theFieldValue);
break;
case 5 :
theModel.setField5(theFieldValue);
break;
case 6 :
theModel.setField6(theFieldValue);
break;
case 7 :
theModel.setField7(theFieldValue);
break;
case 8 :
theModel.setField8(theFieldValue);
break;
case 9 :
theModel.setField9(theFieldValue);
break;
case 10 :
theModel.setField10(theFieldValue);
break;
case 11 :
theModel.setField11(theFieldValue);
break;
case 12 :
theModel.setField12(theFieldValue);
break;
case 13 :
theModel.setField13(theFieldValue);
break;
case 14 :
theModel.setField14(theFieldValue);
break;
case 15 :
theModel.setField15(theFieldValue);
break;
}
}
}

2. 编写如下所示的 Layout xml。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="#006699"
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.blmsr.manager.CategoryEditorActivity">


<LinearLayout
android:id="@+id/addCategiryNameItem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">


<TextView
android:id="@+id/categoryNameTextView"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:text="@string/lbl_category_name"
android:textStyle="bold"
/>


<TextView
android:id="@+id/categoryIconName"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="@string/lbl_category_icon_name"
android:textStyle="bold"
/>


</LinearLayout>


<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">


<EditText
android:id="@+id/categoryNameEditText"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:hint="@string/lbl_category_name"
android:inputType="textAutoComplete" />




<ScrollView
android:id="@+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="wrap_content">


<LinearLayout
android:id="@+id/linearLayout2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">


<LinearLayout
android:id="@+id/linearLayout3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">




</LinearLayout>


<ImageButton
android:id="@+id/addField"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_below="@+id/addCategoryLayout"
android:src="@drawable/ic_input_add"
android:onClick="addField"
/>
</LinearLayout>
</ScrollView>
</LinearLayout>

一旦您完成您的视图将如下所示

小开

Kotlin 扩展解决方案

添加 removeSelf以直接调用视图。如果附加到父母，它将被删除。这使您的代码更具声明性，从而更具可读性。

myView.removeSelf()


fun View?.removeSelf() {
this ?: return
val parent = parent as? ViewGroup ?: return
parent.removeView(this)
}

下面是如何以编程方式向 ViewGroup添加视图的3个选项。

// Built-in
myViewGroup.addView(myView)


// Reverse addition
myView.addTo(myViewGroup)


fun View?.addTo(parent: ViewGroup?) {
this ?: return
parent ?: return
parent.addView(this)
}


// Null-safe extension
fun ViewGroup?.addView(view: View?) {
this ?: return
view ?: return
addView(view)
}