Android处置ListView的条目长按事件

Android处理ListView的条目长按事件
Android处理ListView的条目长按事件
Android, 条目, ListView
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(R.layout.main);
  Cursor cursor = getContentResolver().query(CallLog.Calls.CONTENT_URI,
    null, null, null, CallLog.Calls.DEFAULT_SORT_ORDER);
  startManagingCursor(cursor);
  SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
    android.R.layout.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);
}
}