带有RelativeLayout的ListView在按下时不突出显示背景

发布于 2024-10-20 08:34:03 字数 3407 浏览 6 评论 0原文

我想要一个元素列表(使用 ListView),并且列表中的每个元素都使用相对布局进行样式设置。目前,这些项目显示正确,但是,由于某种原因,单击列表视图项目时它们不会发出绿光。这是为什么呢?

我已将所有代码删除到最少,但它仍然可以执行此操作。

活动类

package com.test;

import android.app.Activity;

public class My_ListView extends Activity
{
    private ListView_Adapter listViewAdapter;
    private ListView listView;

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


        // initialise the list-view object
        listViewAdapter = new ListView_Adapter(this);
        listView = (ListView) findViewById(R.id.listview);
        listView.setAdapter(listViewAdapter);


        for (int i=0;i<20;i++)
        {
            listViewAdapter.add("item "+i);
        }

    }
    public void clicked(View v)
    {
        v.setBackgroundColor(0xFF0000FF);
    }
}

列表视图项适配器类

package com.test;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class ListView_Adapter extends ArrayAdapter<String>
{
    public ListView_Adapter(Context c)
    {
        super(c, R.layout.my_listview_item);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {
        View row = convertView;
        StationFinder_ListViewItemHolder holder = null;

        if (row == null)
        {
            LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            row = inflater.inflate(R.layout.my_listview_item, parent, false);
            holder = new StationFinder_ListViewItemHolder(row);
            row.setTag(holder);
        }
        else
        {
            holder = (StationFinder_ListViewItemHolder) row.getTag();
        }

        holder.populateFrom(getItem(position));

        return row;
    }

    static class StationFinder_ListViewItemHolder
    {
        private TextView destination = null;

        StationFinder_ListViewItemHolder(View row)
        {
            destination = (TextView) row.findViewById(R.id.text1);
        }

        void populateFrom(String locationDistance)
        {
            destination.setText(locationDistance);
        }

    }
}

my_listview.xml

<?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"
    >

    <ListView android:id="@+id/listview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        />
</LinearLayout>

my_listview_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:onClick="clicked"
    >
    <TextView android:id="@+id/text1"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        />
</RelativeLayout>

I want to have a list of elements (using a ListView) and each element in list is styled with a relative layout. Currently, the items are being displayed correctly, however, for some reason the listview items dont glow green when they're clicked. Why is this?

I have removed all code to minimals and it still does this.

Activity class

package com.test;

import android.app.Activity;

public class My_ListView extends Activity
{
    private ListView_Adapter listViewAdapter;
    private ListView listView;

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


        // initialise the list-view object
        listViewAdapter = new ListView_Adapter(this);
        listView = (ListView) findViewById(R.id.listview);
        listView.setAdapter(listViewAdapter);


        for (int i=0;i<20;i++)
        {
            listViewAdapter.add("item "+i);
        }

    }
    public void clicked(View v)
    {
        v.setBackgroundColor(0xFF0000FF);
    }
}

The listview item adapter class

package com.test;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

public class ListView_Adapter extends ArrayAdapter<String>
{
    public ListView_Adapter(Context c)
    {
        super(c, R.layout.my_listview_item);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {
        View row = convertView;
        StationFinder_ListViewItemHolder holder = null;

        if (row == null)
        {
            LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            row = inflater.inflate(R.layout.my_listview_item, parent, false);
            holder = new StationFinder_ListViewItemHolder(row);
            row.setTag(holder);
        }
        else
        {
            holder = (StationFinder_ListViewItemHolder) row.getTag();
        }

        holder.populateFrom(getItem(position));

        return row;
    }

    static class StationFinder_ListViewItemHolder
    {
        private TextView destination = null;

        StationFinder_ListViewItemHolder(View row)
        {
            destination = (TextView) row.findViewById(R.id.text1);
        }

        void populateFrom(String locationDistance)
        {
            destination.setText(locationDistance);
        }

    }
}

my_listview.xml

<?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"
    >

    <ListView android:id="@+id/listview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        />
</LinearLayout>

my_listview_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:onClick="clicked"
    >
    <TextView android:id="@+id/text1"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        />
</RelativeLayout>

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评论(1

逆蝶 2024-10-27 08:34:03

我认为您可能需要在设置背景颜色后调用 invalidate()

您可能想通过设置 listSelector 来实现此目的可能还有 ListView 的 drawSelectorOnTop 。这样,选择/取消选择和点击就会以正常方式处理。

编辑 - 另外,由于您使用的是 ListView,您可能希望通过在 ListView 上设置 OnItemClickListener 来监听点击。

I think you may have to call invalidate() after setting the background color.

You may want to do this instead by setting the listSelector and possibly drawSelectorOnTop for your ListView. That way the selection/deselection and clicks will be handled in the normal manner.

Edit - also, since you're using a ListView, you probably want to listen for clicks by setting an OnItemClickListener on your ListView.

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