如何使用适配器在按钮单击时添加 ListView 项目 [英] How to add ListView items on button click using adapter
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问题描述
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:
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:
- 创建 EditText 和提交按钮
- 在同一个活动中创建列表视图
- 通过点击提交按钮,它应该会在列表视图中显示.
我在这里看到了这个类似的问题:将项目动态添加到列表视图 android
I saw this similar question here:add items to listview dynamically android
但我无法理解答案.请有人解释如何做到这一点.
But i couldn't understand the answer.Somebody please explain how to do this.
推荐答案
您只需执行以下操作:像这样准备你的xml:
You just do the following : Prepare your xml like this :
<?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>
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();
}
});
}
}
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