Android 如何使用适配器在按钮单击时添加 ListView 项目

How to add ListView items on button click using adapter

提问by Nevaeh

How to take data that was typed in EditText and by clicking "submit" in that window should add it to previous activity listview items? What I need to do is:

如何获取在 EditText 中输入的数据并通过单击该窗口中的“提交”将其添加到以前的活动列表视图项中？我需要做的是：

1. Creating EditText and submit button
2. Creating listview in same Activity
3. By clicking submit button it should display it in listview.

1. 创建 EditText 和提交按钮
2. 在同一个活动中创建列表视图
3. 通过单击提交按钮，它应该在列表视图中显示它。

I saw this similar question here:add items to listview dynamically android

我在这里看到了这个类似的问题：add items to listview dynamic android

But i couldn't understand the answer.Somebody please explain how to do this.

但我无法理解答案。请有人解释如何做到这一点。

回答by Shahinoor Shahin

You just do the following : Prepare your xml like this :

您只需执行以下操作： 像这样准备您的 xml：

<?xml version="1.0" encoding="utf-8"?>
<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" >

  <EditText
     android:id="@+id/editText"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:layout_alignParentTop="true"
     android:layout_toLeftOf="@+id/addItem"
     android:hint="Add a new item to List View" />

  <Button
     android:id="@+id/addItem"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_alignParentRight="true"
     android:text="Add" /> 

  <ListView
     android:id="@+id/listView"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:layout_below="@+id/editText" >
  </ListView>

</RelativeLayout>

Activity looks like following :

活动如下所示：

public class MainActivity extends Activity {
    EditText editText;
    Button addButton;
    ListView listView;
    ArrayList<String> listItems;
    ArrayAdapter<String> adapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText = (EditText) findViewById(R.id.editText);
        addButton = (Button) findViewById(R.id.addItem);
        listView = (ListView) findViewById(R.id.listView);
        listItems = new ArrayList<String>();
        listItems.add("First Item - added on Activity Create");
        adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, listItems);
        listView.setAdapter(adapter);
        addButton.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                listItems.add(editText.getText().toString());
                adapter.notifyDataSetChanged();
            }
        });
        listView.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> a, View v, int position,
                    long id) {
                Toast.makeText(MainActivity.this, "Clicked", Toast.LENGTH_LONG)
                        .show();
            }
        });
    }
}

回答by M D

Create String Arraylistand initialize it

创建String Arraylist并初始化它

    ArrayList<String> str1 = new ArrayList<String>();

Add some values on it

在其上添加一些值

     str1.add("First Row");
     str1.add("Second Row");
     str1.add("Third Row");
     str1.add("Fourth Row");
     str1.add("Fifth Row");

Then set Adapterto ListView

然后设置Adapter为ListView

adapter=new ListAdapter(this,str1);
list.setAdapter(adapter);

then add your EditTexttext into str1 and then called adapter.notifyDataSetChanged();like

然后添加EditText文字到str1和当时称为adapter.notifyDataSetChanged();像

str1.add(edit_message.getText().toString());
adapter.notifyDataSetChanged();

Try to add this code into Button onclick()

尝试将此代码添加到 Button onclick()

Demo Output:

演示输出：

回答by Thunder

Suppose you have an arraylist

假设你有一个数组列表

ArrayList<String> dataList = new Arraylist ();

So On clicking of button, you need to add the new data item into your data arraylist.

所以 On clicking of button, you need to add the new data item into your data arraylist.

For this first take the value entered in edittext and store in a string.

为此，首先获取在 edittext 中输入的值并存储在字符串中。

String editedValue = yourEditText.getText.toString();

Then we need to add this in our datalist.

然后我们需要将它添加到我们的数据列表中。

Like

喜欢

dataList.add(editedValue);

And then just call adapter.notifyDataSetChanged()

然后只需调用 adapter.notifyDataSetChanged()

yourAdapter.notifyDataSetChanged();

It will work.

它会起作用。