Android常见UI组件之ListView(二)——定制ListView
最后更新于:2022-04-01 20:16:42
**Android常见UI组件之ListView(二)——定制ListView**
这一篇接上篇,展示ListView中选择多个项及实现筛选功能~
1、在位于res/values文件夹下的strings.xml文件中添加如下代码:
~~~
BasicView5
Settings
Hello world!
- Dwight D. Eisenhower
- John F. Kennedy
- Lyndon B. Johnson
- Richard Nixon
- Gerald Ford
- Jimmy Carter
- Ronald Reagan
- George H.W. Bush
- Bill Clinton
- George W. Bush
- Barack Obama
~~~
2、修改上一篇中的BasicView5.java文件的代码,修改后的代码如下:
~~~
package com.example.basicview5;
import android.os.Bundle;
import android.app.Activity;
import android.app.ListActivity;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends ListActivity {
String[] presidents;//将列表信息存储在strings.xml文件中,再以编程方式读取
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// ---no need to call this---//
// setContentView(R.layout.activity_main);
ListView listView = getListView();// 获取ListActivity的列表视图
listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);// 可以选择多个项
listView.setTextFilterEnabled(true);//启用筛选功能,在键盘上输入,ListView自动筛选
// getResources()方法以编程方式检索与应用程序捆绑的资源
presidents = getResources().getStringArray(R.array.presidents_array);
setListAdapter(new ArrayAdapter(this,
android.R.layout.simple_list_item_checked, presidents));
}
public void onListItemClick(ListView parent, View v, int position, long id) {
Toast.makeText(this, "You have selected " + presidents[position],
Toast.LENGTH_SHORT).show();
}
@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;
}
}
~~~
3、运行程序,效果如下:
![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-08-23_57bc06b4620c7.jpg)
4、在activity_main.xml文件中添加代码如下:
~~~
~~~
5、在BasicView5.java文件中添加代码,如下:
~~~
package com.example.basicview5;
import android.os.Bundle;
import android.app.Activity;
import android.app.ListActivity;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class MainActivity extends ListActivity {
String[] presidents;//将列表信息存储在strings.xml文件中,再以编程方式读取
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// ---need to call this---//
setContentView(R.layout.activity_main);//由于在xml文件中添加了一个ListView部分填充一个活动,所以需要加载活动内容。
ListView listView = getListView();// 获取ListActivity的列表视图
listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);// 可以选择多个项
listView.setTextFilterEnabled(true);//启用筛选功能,在键盘上输入,ListView自动筛选
// getResources()方法以编程方式检索与应用程序捆绑的资源
presidents = getResources().getStringArray(R.array.presidents_array);
setListAdapter(new ArrayAdapter(this,
android.R.layout.simple_list_item_checked, presidents));
}
public void onListItemClick(ListView parent, View v, int position, long id) {
Toast.makeText(this, "You have selected " + presidents[position],
Toast.LENGTH_SHORT).show();
}
public void onClick(View view) {
ListView listView = getListView();
String itemsSelected = "Selected items: \n";
for(int i = 0; i < listView.getCount(); i++) {
if(listView.isItemChecked(i)) {//找出被选中的item
itemsSelected += listView.getItemAtPosition(i) + "\n";//返回指定位置的項的名称
}
}
Toast.makeText(this, itemsSelected, Toast.LENGTH_LONG).show();
}
@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;
}
}
~~~
6、运行效果如下:
![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-08-23_57bc06b49607d.jpg)
筛选并选中几个项,再按按钮显示选择了那些项:
![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-08-23_57bc06b4caf78.jpg)
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