突出显示列表视图项

Posted 2023-03-06

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【中文标题】突出显示列表视图项【英文标题】：highlight listview item 【发布时间】：2012-11-21 21:31:20 【问题描述】：

当我触摸它并保持突出显示时，我需要突出显示一个列表视图项。我尝试了我发现的一切，但没有任何效果。这是我的代码：

这是列表视图：

<ListView
    android:id="@+id/lvUsers"
    android:layout_
    android:layout_
    android:layout_alignParentLeft="true"
    android:background="@drawable/border2"
    android:choiceMode="singleChoice"
    android:padding="5dp" >
</ListView>

@drawable/border2 只是列表视图的边框。

这是列表视图项布局：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/layoutUsersRow"
android:layout_
android:layout_
android:background="@drawable/list_selector_background"
android:orientation="vertical" >

<TextView
    android:id="@+id/tvAllUsersName"
    android:layout_
    android:layout_
    android:padding="10dp"
    android:text="User name"
    android:textAppearance="?android:attr/textAppearanceLarge" />

这是 list_selector_background：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_focused="true" android:drawable="@color/blue" /> <!-- focused -->
    <item android:state_focused="true" android:state_pressed="true" android:drawable="@color/blue" /> <!-- focused and pressed-->
    <item android:state_pressed="true" android:drawable="@color/blue" /> <!-- pressed -->
    <item android:drawable="@color/transparent" /> <!-- default -->
</selector>

这是来自列表视图适配器的代码

public class UsersAdapter extends BaseAdapter implements OnClickListener 

LoginActivity context;
private List<String> listOfUsers;

public UsersAdapter(LoginActivity _context, List<String> listOfUsers) 
    context = _context;
    this.listOfUsers = listOfUsers;


public int getCount() 
    return listOfUsers.size();


public Object getItem(int position) 
    return listOfUsers.get(position);


public long getItemId(int position) 
    return position;


public View getView(int position, View convertView, ViewGroup parent) 
    String entry = listOfUsers.get(position);
    if (convertView == null) 
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.users_row, null);
    

    TextView UserName = (TextView) convertView.findViewById(R.id.tvAllUsersName);
    UserName.setText(entry);

    LinearLayout LinLayout = (LinearLayout) convertView.findViewById(R.id.layoutUsersRow);
    LinLayout.setFocusableInTouchMode(false);
    LinLayout.setFocusable(false);
    LinLayout.setOnClickListener(this);

    return convertView;


public void onClick(View v) 
    // get the row the clicked button is in
    LinearLayout row = (LinearLayout) v;

    TextView child = (TextView) row.getChildAt(0);
    if (child.getText().toString().equals("Admin")) 
        Intent i = new Intent("com.vorteksed.checkinform.ADMINLOGINACTIVITY");
        i.putExtra("verificationFor", "ADMIN_LOGIN");
        context.startActivity(i);
     else 
        context.userClicked(child.getText().toString());

        // focus the pin field after selecting user name from the list
        if (context.currentList != null) 
            context.etLoginPin.setVisibility(View.VISIBLE);
            context.tvPin.setVisibility(View.VISIBLE);
            context.etLoginPin.requestFocus();
            context.etLoginPin.setText("");
            InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.showSoftInput(context.etLoginPin, 0);

这不起作用。它仅在按下时突出显示该项目。一放开，亮点就消失了。

解决方案在这里

从列表视图项布局中删除android:background="@drawable/list_selector_background" 行。根本不需要选择器。这是适配器的代码：

public class UsersAdapter extends BaseAdapter 

LoginActivity context;
private List<String> listOfUsers;
boolean[] arrBgcolor;
private int blue = Color.BLUE;
private int transparent = Color.TRANSPARENT;

public UsersAdapter(LoginActivity _context, List<String> listOfUsers) 
    context = _context;
    this.listOfUsers = listOfUsers;

    arrBgcolor = new boolean[listOfUsers.size()];
    resetArrbg();



private void resetArrbg() 
    for (int i = 0; i < arrBgcolor.length; i++) 
        arrBgcolor[i] = false;                  
    


public int getCount() 
    return listOfUsers.size();


public Object getItem(int position) 
    return listOfUsers.get(position);


public long getItemId(int position) 
    return position;


public View getView(final int position, View convertView, ViewGroup parent) 
    String entry = listOfUsers.get(position);
    if (convertView == null) 
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.users_row, null);
    


    TextView UserName = (TextView) convertView.findViewById(R.id.tvAllUsersName);
    UserName.setText(entry);

    LinearLayout LinLayout = (LinearLayout) convertView.findViewById(R.id.layoutUsersRow);
    LinLayout.setFocusableInTouchMode(false);
    LinLayout.setFocusable(false);
    LinLayout.setOnClickListener(new OnClickListener() 
        public void onClick(View v) 
            handleClick(v, position);
        
    );

    if (arrBgcolor[position])
        LinLayout.setBackgroundColor(blue);
    else 
        LinLayout.setBackgroundColor(transparent);

    return convertView;


public void handleClick(View v, int position) 
    LinearLayout row = (LinearLayout) v;

    resetArrbg();
    arrBgcolor[position] = true;
    notifyDataSetChanged();

    TextView child = (TextView) row.getChildAt(0);
    if (child.getText().toString().equals("Admin")) 
        Intent i = new Intent("com.vorteksed.checkinform.ADMINLOGINACTIVITY");
        i.putExtra("verificationFor", "ADMIN_LOGIN");
        context.startActivity(i);
     else 
        context.userClicked(child.getText().toString());

        // focus the pin field after selecting user name from the list
        if (context.currentList != null) 
            context.etLoginPin.setVisibility(View.VISIBLE);
            context.tvPin.setVisibility(View.VISIBLE);
            context.etLoginPin.requestFocus();
            context.etLoginPin.setText("");
            InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.showSoftInput(context.etLoginPin, 0);

【问题讨论】：

查看此链接。它可能会有所帮助：***.com/questions/8565999/… 已经看过了。没有帮助。 【参考方案1】：

删除选择器并尝试以下操作：

编辑

public class UsersAdapter extends BaseAdapter implements OnClickListener 

        LoginActivity context;
        private List<String> listOfUsers;
        boolean[] arrBgcolor;
        private int blue = Color.BLUE;

        public UsersAdapter(LoginActivity _context, List<String> listOfUsers) 
            context = _context;
            this.listOfUsers = listOfUsers;

            arrBgcolor = new boolean[listOfUsers.size()];
            resetArrbg();

        

        private void resetArrbg() 
            for (int i = 0; i < arrBgcolor.length; i++) 
                arrBgcolor[i] = false;                  
            
        

        ......

        public View getView(final int position, View convertView, ViewGroup parent) 
            String entry = listOfUsers.get(position);
            if (convertView == null) 
                LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                convertView = inflater.inflate(R.layout.users_row, null);
            


            TextView UserName = (TextView) convertView.findViewById(R.id.tvAllUsersName);
            UserName.setText(entry);

            LinearLayout LinLayout = (LinearLayout) convertView.findViewById(R.id.layoutUsersRow);
            LinLayout.setFocusableInTouchMode(false);
            LinLayout.setFocusable(false);
            LinLayout.setOnClickListener(this);

            //add the following, the position is accessible from here
            if (arrBgcolor[position]) 
                convertView.setBackgroundColor(blue);
            
            convertView.setOnClickListener(new OnClickListener() 
                @Override
                public void onClick(View v) 
                    resetArrbg();
                    arrBgcolor[position] = true;
                    notifyDataSetChanged();
                
            ); 
            return convertView;

【讨论】：

这提供了多项选择。而且当我滚动列表视图时，选择会在几个项目上重复，尽管我只选择了一个。选择重复，因为您没有处理 convertView 背景。使用 ArrayList 可以解决问题，因为您正在逐个检查每个位置。 @mango 我处理了多选，但是滚动时重复选择呢？什么意思？你的意思是选择发生在不同的位置？试试上面编辑的代码。这就是我所说的：如果我单击第一个项目，它会突出显示它。但是，如果我向下滚动，则会突出显示更多项目。为什么会这样？【参考方案2】：

////@drawable/list_selector

 <selector xmlns:android="http://schemas.android.com/apk/res/android">

  <item android:drawable="@drawable/list_item_bg_normal"
  android:state_pressed="false" android:state_selected="false" android:state_activated="false"/>

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

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

 <item android:drawable="@drawable/list_item_bg_pressed"
  android:state_activated="true"/>

</selector>

/////////////////在ListView上

        <ListView
        android:id="@+id/list_slidermenu"
        android:layout_
        android:layout_
        android:layout_gravity="start"
        android:choiceMode="singleChoice"
        android:dividerHeight="1dp"
        android:listSelector="@drawable/list_selector"
        android:background="@color/list_background"
        android:divider="#060606"/>

///////////////////列表视图项

       <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:layout_
       android:layout_
       android:background="@drawable/list_selector">

      <ImageView
      android:id="@+id/icon"
      android:layout_
      android:layout_
      android:layout_alignParentLeft="true"
      android:layout_marginLeft="12dp"
      android:layout_marginRight="12dp"
      android:contentDescription="@string/desc_list_item_icon"
      android:src="@drawable/ic_home"
      android:layout_centerVertical="true" />

      </RelativeLayout>

【讨论】：

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