史上最全selector和shape使用方法 Android ListView 列表项点击之后，保持背景颜色_安卓listview选中项时如何如何改变文字颜色不改背景

<?xml version="1.0" encoding="utf-8" ?>     
<selector xmlns:android="http://schemas.android.com/apk/res/android">   
<!-- 默认时的背景图片-->    
  <item android:drawable="@drawable/pic1" />      
<!-- 没有焦点时的背景图片 -->    
  <item android:state_window_focused="false"     
        android:drawable="@drawable/pic1" />     
<!-- 非触摸模式下获得焦点并单击时的背景图片 -->    
  <item android:state_focused="true" android:state_pressed="true"   android:drawable= "@drawable/pic2" />   
<!-- 触摸模式下单击时的背景图片-->    
<item android:state_focused="false" android:state_pressed="true"   android:drawable="@drawable/pic3" />    
<!--选中时的图片背景-->    
  <item android:state_selected="true"   android:drawable="@drawable/pic4" />     
<!--获得焦点时的图片背景-->    
  <item android:state_focused="true"   android:drawable="@drawable/pic5" />     
</selector>

其实你在ListView的OnItemClickListener里边，将当前选中的item执行setSelected(true)就好了

按照他的方法，我在监听列表项点击函数写了如下代码：

ListView listView = (ListView) getActivity().findViewById(
				R.id.listmessage);
		listView.setOnItemClickListener(new OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
					long arg3) {
 
				AlertDialog.Builder builder = new AlertDialog.Builder(
						getActivity());
				builder.setIcon(R.drawable.ic_launcher);
				builder.setTitle(maps.get(arg2).get("messagetitle").toString());
 
				MessageToAccount metoacc = TradeAPI.getInstance().queryMessage(
						(String) maps.get(arg2).get("guid"));
				byte[] messagebyte = metoacc.getContext();
				if (messagebyte != null) {
					try {
						new String(messagebyte, "UTF-8");
					} catch (UnsupportedEncodingException e) {
						e.printStackTrace();
					}
				}
				// builder.setMessage(messagecontent);
				builder.setMessage("现货交易中通行的是一手交钱一手交货的交易方式，或者采取以货易货的交易方式。的方式在限期内结算。现货交易与其它交易方式的不同点有：①在交易的目的上，是为了获得商品的所有权。");
				builder.show();
			}
		});</span>

最最关键的莫过于这段代码：

   arg1.setSelected(true);就实现了每次点击之后保持颜色不变。至此效果完成了，贴出我的selector的xml文件：</span></span>

<?xml version="1.0" encoding="utf-8"?>  
<selector  
    xmlns:android="http://schemas.android.com/apk/res/android">  
    <item android:state_selected="true">  
        <shape>  
            <!-- 渐变 -->  
            <gradient  
                android:startColor="#B4B4B4"  
                android:endColor="#B4B4B4"  
                android:type="radial"  
                android:gradientRadius="50" />  
            <!-- 描边 -->  
            <stroke  
                android:width="2dp"  
                android:color="#dcdcdc"  
                android:dashWidth="5dp"   
                android:dashGap="3dp" />  
            <!-- 圆角 -->  
            <corners  
                android:topLeftRadius="5dp"
                android:topRightRadius="5dp"
                android:bottomLeftRadius="5dp" 
                android:bottomRightRadius="5dp"/>  
            <padding  
                android:left="10dp"  
                android:top="10dp"  
                android:right="10dp"  
                android:bottom="10dp" />  
        </shape>  
    </item>
    
    <item android:state_pressed="true">  
        <shape>  
            <!-- 渐变 -->  
            <gradient  
                android:startColor="#B4B4B4"  
                android:endColor="#B4B4B4"  
                android:type="radial"  
                android:gradientRadius="50" />  
            <!-- 描边 -->  
            <stroke  
                android:width="2dp"  
                android:color="#dcdcdc"  
                android:dashWidth="5dp"   
                android:dashGap="3dp" />  
            <!-- 圆角 -->  
            <corners  
                android:topLeftRadius="5dp"
                android:topRightRadius="5dp"
                android:bottomLeftRadius="5dp" 
                android:bottomRightRadius="5dp"/>  
            <padding  
                android:left="10dp"  
                android:top="10dp"  
                android:right="10dp"  
                android:bottom="10dp" />  
        </shape>  
    </item>
    
  
    <item>         
        <shape>  
            <solid android:color="#2B2B2B"/>  
            <stroke  
                android:width="2dp"  
                android:color="#2B2B2B" />  
            <corners   
                android:topLeftRadius="5dp"
                android:topRightRadius="5dp"
                android:bottomLeftRadius="5dp" 
                android:bottomRightRadius="5dp"  
            />  
            <padding  
                android:left="10dp"  
                android:top="10dp"  
                android:right="10dp"  
                android:bottom="10dp" />  
        </shape>  
    </item>  
</selector>  

    

    这里虽然实现了保持颜色的效果，但是在点击按下列表项的时候，背景会有默认的黄色背景，找到了如下的解决方案：

     就是在listview标签里面设置选中时为透明的背景：<?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="match_parent"
    android:background="@color/background"
    android:orientation="vertical" >


    <ListView
        android:id="@+id/listmessage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:listSelector="@android:color/transparent"  >
    </ListView>
    成功解决！！！

    还遇到一个问题，就是显示的时候有一个黑色的分割线，好难看，需要隐藏掉：    第四个需求就是：点击了某一个列表项之后，要求改变字体的颜色，这里的解决方案是：

     第一步：设定一个全局变量，保存哪个列表项被点击了。

    第二步：在列表项点击监听事件中，取得被点击的列表项的具体行数，传给适配器，如果和position匹配，则得到改textview，然后就可以进行判断，如果点击的行数和postion一样，则更改颜色，并进行列表更新。

   代码如下：

   

package client.verbank.mtp.allone.frame.message;
 
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
 
import jedi.verbank.CSTS3.comm.struct.MessageToAccount;
import jedi.verbank.client.station.api.ClientAPI;
import jedi.verbank.client.station.api.trade.TradeAPI;
import jedi.verbank.client.station.api.trade.TradeResult_SimpleReport;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import client.verbank.mtp.allone.R;
import client.verbank.mtp.allone.component.DialogManager;
import client.verbank.mtp.allone.component.DialogType;
import client.verbank.mtp.allone.consts.IBundleCommData;
import client.verbank.mtp.allone.frame.ControlFragment;
import client.verbank.mtp.allone.frame.MainActivity;
import client.verbank.mtp.allone.util.TimeUtil;
 
 
public class MessageFragment extends ControlFragment {
 
	private int selectItem = -1;
 
 
 
 
 
	/*
	 * :对展示的listview列表项进行监听，主要使用fragment的onActivityCreated的Activity创建完成之后
	 * 取到列表的值，进行更新。
	 */
 
	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		super.onActivityCreated(savedInstanceState);
		ListView listView = (ListView) getActivity().findViewById(
				R.id.listmessage);
		listView.setOnItemClickListener(new OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
					long arg3) {
 
				<span style="font-size:24px;color:#ff0000;"><strong>arg1.setSelected(true);
		selectItem = arg2; // 当前选择的节目item
		messageAd.notifyDataSetChanged(); // 通知adapter刷新数据 }</strong></span>
 
				AlertDialog.Builder builder = new AlertDialog.Builder(
						getActivity());
				builder.setIcon(R.drawable.ic_launcher);
				builder.setTitle(maps.get(arg2).get("messagetitle").toString());
 
				MessageToAccount metoacc = TradeAPI.getInstance().queryMessage(
						(String) maps.get(arg2).get("guid"));
				byte[] messagebyte = metoacc.getContext();
				if (messagebyte != null) {
					try {
						new String(messagebyte, "UTF-8");
					} catch (UnsupportedEncodingException e) {
						e.printStackTrace();
					}
				}
				// builder.setMessage(messagecontent);
				builder.setMessage("现货交易中通行的是一手交钱一手交货的交易方式，或者采取以货易货的交易方式。的方式在限期内结算。现货交易与其它交易方式的不同点有：①在交易的目的上，是为了获得商品的所有权。");
				builder.show();
			}
		});
	}
 
	
 
	// 开仓单适配器
	public class MessageAdapter extends BaseAdapter {
		public MessageAdapter(Context myContext) {
		}
 
		public MessageAdapter(MessageFragment messageFragment) {
		}
 
		@Override
		public int getCount() {
			if (maps == null) {
				return 0;
			}
			return maps.size();
		}
 
		@Override
		public Object getItem(int position) {
			return position;
		}
 
		@Override
		public long getItemId(int position) {
			return position;
		}
 
		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			ViewHolder viewHolder = null;
			if (convertView == null) {
				viewHolder = new ViewHolder();
				convertView = getActivity().getLayoutInflater().inflate(
						R.layout.activity_message_item, null);
 
				viewHolder.messagetitle = (TextView) convertView
						.findViewById(R.id.messagetitle);
				viewHolder.messagetime = (TextView) convertView
						.findViewById(R.id.messagetime);
				convertView.setTag(viewHolder);
			} else {
				viewHolder = (ViewHolder) convertView.getTag();
			}
 
			TextView messagetitle = (TextView) convertView
					.findViewById(R.id.messagetitle);
			TextView messagetime = (TextView) convertView
					.findViewById(R.id.messagetime);
 
		<span style="font-size:18px;color:#cc0000;"><strong>	try {
				if (selectItem == position) {
					messagetitle.setTextColor(android.graphics.Color.BLACK);
					messagetime.setTextColor(android.graphics.Color.BLACK);
					viewHolder.messagetitle.setText(maps.get(position)
							.get("messagetitle").toString());
					viewHolder.messagetime.setText(maps.get(position)
							.get("messagetime").toString());
				} else {
					messagetitle.setTextColor(android.graphics.Color.WHITE);
					messagetime.setTextColor(android.graphics.Color.WHITE);
					viewHolder.messagetitle.setText(maps.get(position)
							.get("messagetitle").toString());
					viewHolder.messagetime.setText(maps.get(position)
							.get("messagetime").toString());
				}
			} catch (Exception ex) {
				ex.printStackTrace();
			}</strong></span>
			return convertView;
		}
 
		private class ViewHolder {
			TextView messagetitle;
			TextView messagetime;
 
		}
	}
 
	@Override
	public String getFragmentTitle() {
		return "";
	}
 
	@Override
	public int getFramentKey() {
		return IBundleCommData.FRAGMENT_ID_Message;
	}
 
	@Override
	public void onMessageReceive(MessageToAccount arg0) {
		if (!isHidden()) {
			initData();
		}
	}
 
}

       这里的确可以通过上述方法对列表项的文字的颜色进行更改，但这又引起了其他的bug，就是列表项的背景之前是设置了selector和shape的，点击之后更换为白色的背景，但是按照上述的方法设置之后，全部为黑的，其实解决方案也简单，单独对点击和默认的布局，进行背景的设置，放弃掉之前的利用selector进行背景的改变，直接使用shape来设置，代码如下：

  

			try {
				if (selectItem == position) {
					messagetitle.setTextColor(android.graphics.Color.BLACK);
					messagetime.setTextColor(android.graphics.Color.BLACK);
					viewHolder.messagetitle.setText(maps.get(position)
							.get("messagetitle").toString());
					viewHolder.messagetime.setText(maps.get(position)
							.get("messagetime").toString());
					convertView.findViewById(R.id.expandable1)
							.setBackgroundColor(android.graphics.Color.WHITE);
					convertView.findViewById(R.id.expandable1)
							.setBackgroundResource(R.drawable.menu_shapeclick);
				} else {
					messagetitle.setTextColor(android.graphics.Color.WHITE);
					messagetime.setTextColor(android.graphics.Color.WHITE);
					viewHolder.messagetitle.setText(maps.get(position)
							.get("messagetitle").toString());
					viewHolder.messagetime.setText(maps.get(position)
							.get("messagetime").toString());
					convertView.findViewById(R.id.expandable1)
							.setBackgroundResource(
									R.drawable.menu_shapeunonclick);
				}
			} catch (Exception ex) {
				ex.printStackTrace();
			}
			return convertView;
		}

   ————————————————————————————分割线，textview 点击变换背景——————————————————

android:background="@drawable/systemsettingsseletor"
  android:clickable="true"
     android:focusable="true"
       android:focusableInTouchMode="true"

2.selector文件：<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">


    <item android:drawable="@drawable/grayright" android:state_focused="true"/>
    <item android:drawable="@drawable/grayright" android:state_pressed="true"/>


    <item android:drawable="@drawable/grayrightmoren"/>


</selector>