Question

这是我的列表视图代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:background="@color/darkgrey">
    <ListView
        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:divider="#b5b5b5"
        android:dividerHeight="1dp"
        android:listSelector="@drawable/list_selector" />

</LinearLayout>

这是列表选择器：

   <?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:state_pressed="true"
    android:drawable="@drawable/gradient_bg_hover" />

  <item android:state_selected="true"
    android:state_pressed="false"
    android:drawable="@drawable/gradient_bg_hover" />

  <item android:drawable="@drawable/gradient_bg" />
</selector>

我的目标是为列表项添加背景：初始（没有发生点击，没有焦点） - ＆gt;灰色的背景。按下时 - ＆gt;蓝色背景。发布时 - ＆gt;灰色背景。

但最初的背景并没有出现。打开应用程序时以及尚未单击某个项目时，灰色背景不会显示。有人知道如何解决这个问题吗？

java部分：

package com.example.whs;

import java.util.ArrayList;
import java.util.HashMap;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

public class Index extends Activity {

    public static final Object TITLE = "title";
    public static final Object SUBTITLE = "subtitle";
    public static final Object THUMBNAIL = "thumbnail";
    protected static final String POSITION = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_index);

        // Back actionbar icon enable
        //ActionBar actionBar = getActionBar();
        //actionBar.setDisplayHomeAsUpEnabled(true);

        buildMenu();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.index, menu);
        return true;
    }

    //Builds the menu for listview
    public void buildMenu(){
        ArrayList<HashMap<String, String>> menu = new ArrayList<HashMap<String, String>>();
        //Arrays for info
        String[] menuTitleArray = {"Updates", "Gallerij"}; 
        String[] menuSubtitleArray = {"Bekijk updates", "Bekijk foto's en geef reacties", "Bekijk de updates"};
        String[] menuThumbnailArray = {"updates", "gallery"};
        for(int i=0; i < menuTitleArray.length; i++){
            // Build Hashmap for the item
            HashMap<String, String> item = new HashMap<String, String>();
            item.put((String) TITLE, menuTitleArray[i]);
            item.put((String) SUBTITLE, menuSubtitleArray[i]);
            item.put((String) THUMBNAIL, menuThumbnailArray[i]);
            menu.add(item);
        }


        // Add adapter to the list
        MenuAdapter adapter = new MenuAdapter(this, menu);
        ListView list = (ListView)findViewById(R.id.list);
        list.setAdapter(adapter);



        // Initialize the click event
        list.setOnItemClickListener(new OnItemClickListener(){
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id){
                switch(position){
                case 0:
                    Intent intent = new Intent(Index.this, Updates.class);
                    startActivity(intent);
                }
            }
        });

    }
}

Answer 1

我想这是因为列表行的布局xml有自己的背景设置。然后你的listSelector成功设置但被覆盖：）

Answer 2

使用您android:listSelector="@drawable/list_selector" custom item layout项ListView中的ListView。

就像你在这里<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:background="@color/darkgrey"> <ListView android:id="@+id/list" android:layout_width="fill_parent" android:layout_height="wrap_content" android:divider="#b5b5b5" android:dividerHeight="1dp" /> </LinearLayout>

一样

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:listSelector="@drawable/list_selector">

</LinearLayout>

它正在使用以下布局

<item android:drawable="@drawable/button_bg_selected" android:state_selected="true"></item>
<item android:drawable="@drawable/button_bg_pressed" android:state_pressed="true"></item>
<item android:drawable="@drawable/button_bg_normal"></item>

修改

你也可以使用像
这样的选择器
{{1}}

Answer 3

我想你希望在列表行上添加选择器，而不是在ListView上添加:) 以下是您的link。

初始状态可绘制列表选择器不工作

3 个答案: