android：处理ListView的条目长按事件

android：处理ListView的条目长按事件
ListActivity和ListView是很常用的组件，用来制作列表形式的用户界面。

本文介绍如何正确处理ListView中的条目短按和长按事件，他们的处理方式是不同的。

对于短按事件，处理起来比较简单，我们只需要覆盖ListActivity的onListItemClick()方法，如下所示：
@Override
protected void onListItemClick(ListView arg0, View arg1, int arg2, long arg3) { CharSequence s = ((TextView)arg1).getText();
Log.e("CallLogActivity",s+ " is clicked");
super.onListItemClick(arg0, arg1, arg2, arg3);
}
对于长按事件，我们需要给listview注册一个OnItemLongClickListener，并实现Listener中定义的方法，如下所示：
getListView().setOnItemLongClickListener(this);//注册
public boolean onItemLongClick(AdapterView parent, View view, int position, long id) {
Log.e("CallLogActivity", view.toString() + "position=" + position); CharSequence number = ((TextView) view).getText();
Toast t = Toast.makeText(this, number + " is long clicked",
Toast.LENGTH_LONG);
t.show();
return true;
}
我们使用前面介绍的CallLog的演示例子来演示一下如何实现这两种事件，完整的代码如下所示：
package com.me;
import android.app.ListActivity;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.CallLog;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemLongClickListener;
public class CallLogActivity extends ListActivity implements OnItemLongClickListener {
@Override
protected void onCreate(Bundle arg0) {
super.onCreate(arg0);
setContentView(yout.main);
Cursor cursor = getContentResolver().query(CallLog.Calls.CONTENT_URI, null, null, null, CallLog.Calls.DEFAULT_SORT_ORDER); startManagingCursor(cursor);
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
yout.simple_list_item_1, cursor,
new String[] { CallLog.Calls.NUMBER },
new int[] { android.R.id.text1 });
getListView().setOnItemLongClickListener(this);
setListAdapter(adapter);
}
public boolean onItemLongClick(AdapterView parent, View view, int position, long id) {
Log.e("CallLogActivity", view.toString() + "position=" + position); CharSequence number = ((TextView) view).getText();
Toast t = Toast.makeText(this, number + " is long clicked",
Toast.LENGTH_LONG);
t.show();
return true;
}
@Override
protected void onListItemClick(ListView arg0, View arg1, int arg2, long arg3) { CharSequence s = ((TextView)arg1).getText();
Log.e("CallLogActivity",s+ " is clicked");
super.onListItemClick(arg0, arg1, arg2, arg3);
}。