我在我的活动中创建了一个ListView,并使用另一个两个按钮(prev,next)在ListView上移动突出显示。当点击两个按钮时,我打电话给setSelection(pos),但列表视图中没有突出显示。ListView,突出显示所选项目
我也定制试图与布局文件列表项,并在其上注册选择,如描述: http://android-codes-examples.blogspot.com/2011/03/customized-listview-items-selection.html
不幸的是预期它不工作。当我触摸列表项时,此方法确实改变了颜色,但是当我调用setSelection()时没有显示高亮。
布局/ main.xml中(主要布局):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:weightSum="4"
>
<ListView
android:id="@+id/list_view"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_weight="1" />
<LinearLayout
android:orientation="vertical"
android:weightSum="2"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_weight="3">
<Button
android:id="@+id/btn_prev"
android:text="prev"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_weight="1" />
<Button
android:id="@+id/btn_next"
android:text="next"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_weight="1" />
</LinearLayout>
</LinearLayout>
List.java(活动):
package com.android.list;
import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.TableRow;
import android.widget.SimpleAdapter;
import android.widget.SimpleAdapter.ViewBinder;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.graphics.Point;
import android.graphics.Color;
import java.util.ArrayList;
import java.util.HashMap;
public class List extends Activity
implements View.OnClickListener
{
private ArrayList<HashMap<String, String>> mList;
private Button mPrev;
private Button mNext;
private ListView mListView;
private int mPosition;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mList = new ArrayList<HashMap<String, String>>();
HashMap<String, String> map;
String[] ent = { "USA","India","England","Russia","Europe","Canada","Srilanka","Singapore","Thailand","Australia"};
for (int i=0; i<ent.length; i++)
{
map = new HashMap<String, String>();
map.put("content", ent[i]);
mList.add(map);
}
SimpleAdapter adapter = new SimpleAdapter(this,
mList, R.layout.list_item,
new String[] {"content"},
new int[] {R.id.list_text});
mListView = (ListView) findViewById(R.id.list_view);
mListView.setAdapter(adapter);
mPosition = 0;
mListView.setSelection(mPosition);
mPrev = (Button) findViewById(R.id.btn_prev);
mPrev.setOnClickListener(this);
mNext = (Button) findViewById(R.id.btn_next);
mNext.setOnClickListener(this);
}
public void onClick(View view)
{
if (view == mPrev && mPosition >= 0)
{
mListView.setSelection(mPosition);
mPosition--;
}
else if (view == mNext && mPosition < mList.size())
{
mListView.setSelection(mPosition);
mPosition++;
}
}
}
布局/ list_item.xml(列表项布局) :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:chess="http://schemas.android.com/apk/res/org.pengguang.chess"
android:orientation="vertical"
android:background="@color/list_bg"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="@+id/list_text"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
颜色/ list_bg.xml(列表项选择):
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_selected="false"
android:state_pressed="false"
android:drawable="@color/grey" />
<item
android:state_pressed="true"
android:drawable="@color/blue" />
<item
android:state_selected="true"
android:state_pressed="false"
android:drawable="@color/red" />
</selector>
值/ colors.xml(彩色文件):
<?xml version="1.0" encoding="UTF-8"?>
<resources>
<color name="blue">#0303ff</color>
<color name="grey">#f7f7f7</color>
<color name="red">#ff0000</color>
</resources>
我已经尝试过了刚才和onItemSelected不会被触发。从sdk文档:“onItemSelected():设置当前选择的项目。如果在触摸模式下,该项目不会被选中,但它仍然会被正确定位。”那么我们应该关闭列表视图触摸模式吗? – pengguang001 2012-02-16 01:55:04
http://developer.android.com/resources/articles/touch-mode.html 经过仔细考虑,我们决定完全删除选择,当用户通过触摸屏操纵UI时。 在触摸模式下,没有焦点并且没有选择。只要用户进入触摸模式,网格列表中的任何选定项目都会被取消选中。类似地,当用户进入触摸模式时,任何关注的小部件都会变得不重点。下图说明了在用轨迹球选择项目后用户触摸列表时发生的情况。 – jsaye 2012-02-16 08:39:25
新Android开发人员常见的问题是依赖于ListView.getSelectedItemPosition()。在触摸模式下,此方法将返回INVALID_POSITION。您应该改为使用点击侦听器(请参阅setOnItemClickListener(android.widget.AdapterView。OnItemClickListener))或选择模式(请参阅setChoiceMode(int))。 – jsaye 2012-02-16 08:39:38