在项目上单击以查看列表视图

Question

我在线性布局中有一个列表视图和一个按钮。我无法扩展 ListActivity（使用 Onlistitemclick），但我必须在列表视图中选择一个项目，这会打开另一个视图，我必须在其中填写 SQLite DB 的详细信息。

假设数据库正常工作，为以下代码实现此功能的最佳方法是什么？我是初学者。欢迎所有与方法和代码相关的建议。

提前致谢，

public class Contacts extends Activity implements OnClickListener {
    int NewContact_Request_Code = 1;
    Button newcontact;
    ListView listview;
    public static final String LOG_TAG = "Contacts";
    int mInt = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.contactview);
        // Set the content to contactview.xml

        // newcontact = NEW CONTACT button
        // listview = MyList List View
        newcontact = (Button) findViewById(R.id.baddcontact);
        listview = (ListView) findViewById(R.id.mylist);

        // Make a New Database
        DBContact info = new DBContact(this);
        // Open , get Information from database and close it
        info.open();
        String[] data = info.queryAll();
        info.close();
        // listview = getListView();
        listview.setTextFilterEnabled(true);
        // Display the names
     ArrayAdapter<String> adapter = new ArrayAdapter<String>(Contacts.this, android.R.layout.simple_list_item_1, data);
         listview.setAdapter(adapter);
        newcontact.setOnClickListener(this);

    }

    // @Override
    // protected void onListItemClick(ListView l, View v, int position, long id)
    // {
    // // TODO Auto-generated method stub
    // super.onListItemClick(l, v, position, id);
    // Intent viewintent = new Intent(Contacts.this, ViewContact.class);
    // String item = (String) getListAdapter().getItem(position);
    // viewintent.putExtra("name_clicked", item);
    // startActivity(viewintent);
    //
    // }



    public void onClick(View v) {
        // TODO Auto-generated method stub
        Intent newintent = new Intent(Contacts.this, AddNewContact.class);
        // start actiivity for result - to get the name of the new contact
        startActivityForResult(newintent, 0);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        // pass the value of the string via cursor and update the list
    }

}

Answer 1

您可以将 OnItemClickListener 设置为您的ListView，如下所示

listview.setOnItemClickListener(new OnItemClickListener() {

  public void onItemClick(AdapterView adapterView, View view, int position, long id) {

        //Do some more stuff here and launch new activity

  }
});

Answer 2

您可以在其上明确设置onItemClickListener，如下所示：

listview.setOnItemClickListener(listener);

其中listener 是AdapterView.OnItemClickListener

Answer 3

使用OnItemClickListener() 进行列表视图无需从ListActivity 扩展此活动

listview.setOnItemClickListener(new OnItemClickListener() {
   @Override
   public void onItemClick(AdapterView<?> arg0, View v, int arg2, long arg3) {          

   }
});

Answer 4

private final ListView.OnItemClickListener ListClick = new OnItemClickListener() {
    public void onItemClick(AdapterView parent, View view, int position, long id) {
        // your action
    }
};

这样设置

listview.setOnItemClickListener(ListClick);