如何使用适配器上的按钮即可添加的ListView项目 [英] How to add ListView items on button click using adapter
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问题描述
如何把在EditText上并点击提交,在窗口应该将它添加到previous活动列表视图项目类型的数据?
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:
- 创建的EditText和提交按钮
- 在同一活动创建列表视图
- 点击提交按钮应该在列表视图中显示。
我在这里看到了这个类似的问题:项目添加到ListView中动态的Android
I saw this similar question here:add items to listview dynamically android
但我无法理解answer.Somebody请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
您只需做到以下几点:
prepare你的XML是这样的:
You just do the following : Prepare your xml like this :
<?xml version="1.0" encoding="utf-8"?>
<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>
活动看起来像下面这样:
Activity looks like following :
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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