listview选项item点击切换背景问题

设置点击监听，记下当前点击的是第几个（记为k），紧接着调用adapter.notifydatachanged来刷新list。
在adapter的getview中判断，如果是当前是第k项，则调用convertview.setbackgrouncolor设为蓝色背景，否则设为灰色

在适配器里面的getView()中设置view.setBackgroundResource(R.color.颜色名称);如果你要选择条件的话，你可以加上自己的条件，例如：if(position % 2 == 0){view.setBackgroundResource(R.color.颜色名称);}else view.setBackgroundResource(R.color.另一种颜色名称);

package com.ttt;import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
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.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;public class ListTest extends Activity {

    ListView listTest;

    List<String> list = new ArrayList<String>();
    Map<Integer, Boolean> map = new HashMap<Integer, Boolean>();
    ListAdapter adapter;    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.testlist);

        listTest = (ListView) findViewById(R.id.testlist);
        adapter = new ListAdapter();
        listTest.setAdapter(adapter);

        listTest.setOnItemClickListener(new OnItemClickListener() {            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
                Iterator<Integer> it = map.keySet().iterator();
                while(it.hasNext()) {
                    Integer itr = it.next();
                    if(itr != position) {
                        map.put(itr, false);
                    } else {
                        map.put(itr, true);
                    }
                }
                adapter.notifyDataSetChanged();
            }
        });

    }


    class ListAdapter extends BaseAdapter {

        LayoutInflater factory;


        public ListAdapter() {
            for(int i = 0; i < 30; i++) {
                list.add(i + "");
                map.put(i, false);
            }
            factory = LayoutInflater.from(ListTest.this);
        }        @Override
        public int getCount() {
            return list.size();
        }        @Override
        public Object getItem(int position) {
            return list.get(position);
        }        @Override
        public long getItemId(int position) {
            return position;
        }        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            LinearLayout lin = null;
            TextView tv = null;
            if(convertView == null) {
                convertView = factory.inflate(R.layout.listitem, null);
            }
            lin = (LinearLayout) convertView.findViewById(R.id.lin);
            tv = (TextView) convertView.findViewById(R.id.test);

            tv.setText(list.get(position));

                if(map.get(position)) {
                    lin.setBackgroundColor(Color.parseColor("#0000CD"));
                } else {
                    lin.setBackgroundColor(Color.parseColor("#DCDCDC"));
                }

            return convertView;
        }


    }
    }

本帖最后由 graceminc 于 2012-10-31 09:54:35 编辑

给listview添加监听
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if(convertView == null){
LayoutInflater inflater = mContext.getLayoutInflater();
convertView = inflater.inflate(R.layout.vlist, null);
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.text);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
//绘制的时候判断是否是选中项，是绘制选中的状态，否则绘制非选中的状态
if(selectedId == position){
holder.text.setBackgroundResource(R.drawable.diancai2);
}else{
holder.text.setBackgroundResource(R.drawable.diancai3);
}

holder.text.setText(mList.get(position));
return convertView;
}

package com.test.main;import java.util.ArrayList;
import android.app.Activity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;public class TestAdapter extends BaseAdapter {
protected ArrayList<String> mList;
//记录选中的项，绘制的时候判断positon为该值就改变背景
public static int selectedId = 0;
Activity mContext;
public TestAdapter(Activity context) {
mContext = context;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if(convertView == null){
LayoutInflater inflater = mContext.getLayoutInflater();
convertView = inflater.inflate(R.layout.item, null);
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.text);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
//绘制的时候判断是否是选中项，是绘制选中的状态，否则绘制非选中的状态
if(selectedId == position){
holder.text.setBackgroundResource(R.drawable.diancai3);
}else{
holder.text.setBackgroundResource(R.drawable.diancai2);
}

holder.text.setText(mList.get(position));
return convertView;
}
@Override
public int getCount() {
return mList.size();
} @Override
public Object getItem(int arg0) {
return mList.get(arg0);
} @Override
public long getItemId(int arg0) {
return arg0;
} class ViewHolder{
TextView text;
}

public ArrayList<String> getmList() {
return mList;
} public void setmList(ArrayList<String> mList) {
this.mList = mList;
notifyDataSetChanged();
}

/**
* 当用户选中某一项，或者按下up 或 down 按钮时调用
* 将改特殊绘制的项的id传过来，然后notifyDataSetChanged()
* 通知list重绘
* @param positon 选中项的id
*/
public void changeSelected(int positon){
if(positon != selectedId){
selectedId = positon;
notifyDataSetChanged();
}
}
}

package com.test.main;
//
//import java.util.ArrayList;
//import java.util.HashMap;
//
//import android.app.Activity;
//import android.os.Bundle;
//import android.widget.ListView;
//import android.widget.SimpleAdapter;
//
//public class SelectorActivity extends Activity {
//    /** Called when the activity is first created. */
//    @Override
//    public void onCreate(Bundle savedInstanceState) {
//        super.onCreate(savedInstanceState);
//        setContentView(R.layout.main);
//        ListView list=(ListView) findViewById(R.id.list_items);
//
//        ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String, Object>>();
//
//        String []title={"熊掌","黑色","眼睛","绿色",
// "广播","机器人","星星","白色"};
//
//
// for (int i = 0; i < 3; i++)
//
// {
//
// HashMap<String, Object> map = new HashMap<String, Object>();
//
// map.put("more_image", R.drawable.more);
//
// map.put("title", title[i]);
//
//
// listItem.add(map);
//
// }
// SimpleAdapter listItemAdapter= new SimpleAdapter(SelectorActivity.this, listItem,R.layout.item,
// new String[] { "more_image", "title" },
//
// new int[] { R.id.more_image, R.id.title,
// });
//
// list.setAdapter(listItemAdapter);
//
//
//    }
//}
//
// import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AbsListView.OnScrollListener;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;public class SelectorActivity extends Activity implements OnItemClickListener,OnClickListener{
ListView list; //ListView
TestAdapter adapter; //list 的适配器
int position = 0; //当前选中的项
int firstVisiablePositon = 0; //list中可见的第一项
int lastVisiablePositon = 0; //list中可见的最后一项
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        initView();
    } private void initView() {
//初始化及其适配器
list = (ListView) findViewById(R.id.list_items);
adapter = new TestAdapter(this);
//往适配器中添加数据
ArrayList<String> aList = new ArrayList<String>();
for (int i = 0; i < 20; i++) {
aList.add("列表第 " + (i + 1) + "项");
}
adapter.setmList(aList);
list.setAdapter(adapter);
//给list添加监听
list.setOnItemClickListener(this);
list.setOnScrollListener(scrollListener); } @Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
position = arg2; //记录选中位置，这样才能和up和down按钮联合起来
adapter.changeSelected(position);   //通知重绘
doSomething();
}

@Override
public void onClick(View v) { }
//选中某项后具体要做的事情
private void doSomething() {
Toast.makeText(this, "您选中的是  " + adapter.getmList().get(position)
, Toast.LENGTH_SHORT).show();
}
private OnScrollListener scrollListener = new OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
view.setSelection(position);
/**
* 当停止滑动的时候，需要调用setSelection()
* 不然的话来滑动的效果就破坏了--停止滑动后会停留再你选中的位置
*/
if(scrollState == AbsListView.OnScrollListener.SCROLL_STATE_IDLE){
list.setSelection(firstVisiablePositon);
}
}
/**
* 活动过程中一直回调
* 需要一直记录lastVisiablePositon 和 firstVisiablePositon
* 不然原来滑动的效果就破坏了--停止滑动后会停留再你选中的位置
*/
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
lastVisiablePositon = firstVisibleItem + visibleItemCount - 2;
firstVisiablePositon = firstVisibleItem;
}
};
}

item.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">
<TextView android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:id="@+id/text"
android:gravity="center"
android:background="@drawable/diancai3"
android:layout_gravity="center_horizontal">

</TextView>

</LinearLayout>

调试易

listview选项item点击切换背景问题

解决方案 »