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所以即时通讯的初学者在Android/Java编程和即时通讯尝试执行以下操作:从我的微调选择的项目应该在列表视图中,当我点击一个按钮。到目前为止我这样做,日食犯规显示任何错误或警告,但我的应用程序崩溃,当我试图启动它:微调元素listview上点击应用程序崩溃(android)
public class MainActivity extends ActionBarActivity {
Button button3;
Button button2;
Button button4;
ListView listView1;
Spinner s1;
String text;
ArrayAdapter<String> adapter;
ArrayList<String> list;
int itemPos;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button3 = (Button) findViewById(R.id.button3);
button4 = (Button) findViewById(R.id.button4);
button2 = (Button) findViewById(R.id.button2);
s1 = (Spinner) findViewById(R.id.spinner1);
listView1 = (ListView) findViewById(R.id.listView1);
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_single_choice, list); //this part here might not be correct
listView1.setAdapter(adapter);
button3.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String text = s1.getSelectedItem().toString();
adapter.add(text);
}});
listView1.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
itemPos = position;
}
});}}
我不知道为什么会崩溃,如何解决?
谢谢!
谢谢!它解决了我的问题!基本上,当我点击一个按钮时,如何从列表视图中删除选定的项目?谢谢 – 2014-11-02 19:50:56
list.remove(text);应该管用。但不要忘记调用adapter.notifyDataSetChanged();. – Chitrang 2014-11-02 19:55:00