android - 如何在 ListView 中更改多个项目行删除中的背景颜色

Question

我在 ListView 中选择多个项目进行删除。我可以删除多个项目。代码如下:

smsListView.setMultiChoiceModeListener(new MultiChoiceModeListener() {

                @Override
                public void onItemCheckedStateChanged(ActionMode mode,
                        int position, long id, boolean checked) {
                    // Capture total checked items
                    final int checkedCount = smsListView.getCheckedItemCount();
                    // Set the CAB title according to total checked items
                    mode.setTitle(checkedCount + " Selected");
                    View v = smsListView.getChildAt(position
                            - smsListView.getFirstVisiblePosition());
                    // Calls toggleSelection method from ListViewAdapter Class
                    ((SmsArrayAdapter) arrayAdapter).toggleSelection(position,v);

                }

                @Override
                public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
                    switch (item.getItemId()) {
                    case R.id.delete:
                        // Calls getSelectedIds method from ListViewAdapter Class
                        SparseBooleanArray selected = ((SmsArrayAdapter) arrayAdapter)
                                .getSelectedIds();
                        // Captures all selected ids with a loop
                        for (int i = (selected.size() - 1); i >= 0; i--) {
                            if (selected.valueAt(i)) {
                                SMSItem selecteditem = (SMSItem) arrayAdapter.getItem(selected.keyAt(i));
                                // Remove selected items following the ids
                                arrayAdapter.remove(selecteditem);
                            }
                        }
                        // Close CAB
                        mode.finish();
                        return true;
                    default:
                        return false;
                    }
                }

                @Override
                public boolean onCreateActionMode(ActionMode mode, Menu menu) {
                    mode.getMenuInflater().inflate(R.menu.activity_main, menu);
                    return true;
                }

                @Override
                public void onDestroyActionMode(ActionMode mode) {
                    // TODO Auto-generated method stub
                    ((SmsArrayAdapter) arrayAdapter).removeSelection();
                }

                @Override
                public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
                    // TODO Auto-generated method stub
                    return false;
                }


            });

但是我想改变我选择的行的颜色。目前列表中的选择项没有颜色。

我试过以下方法。

第 1 步:将下行写入您的 ListView 项目布局

android:background="?android:attr/activatedBackgroundIndicator"

第 2 步:将下行写入 style.xml 文件

 <style name="AppTheme" parent="@style/Theme.AppCompat.Light">
        <item name="actionBarStyle">@style/MyActionBar</item>
        <item name="android:activatedBackgroundIndicator">@drawable/muliple_selected_item</item>
 </style>

第 3 步:在 Drawable 文件夹中创建 muliple_selected_item.xml 并编写以下代码。

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

但是通过这段代码，当我选择 ListView 的任何项目时，列表的所有项目都被着色了。我只想将背景颜色更改为我选择的那些项目。我怎样才能做到这一点 ？

listview布局如下:

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

    <RelativeLayout
        android:id="@+id/smsItemContainerRelativeLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_centerInParent="true"
            android:layout_gravity="center_horizontal|top"
            android:text="SMS Inbox"
            android:textAppearance="?android:attr/textAppearanceMedium" />

        <TextView
            android:id="@+id/unread_count"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="-20dp" 
            android:background="@drawable/notification_bg"
            android:gravity="center"
            android:text="88"
            android:textColor="@android:color/background_light"
            android:textSize="20sp"
            android:textStyle="bold"   
            android:layout_alignParentRight="true"
            android:visibility="invisible" />



    </RelativeLayout>

    <ListView
        android:id="@+id/SMSList"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"  />


</LinearLayout>

行布局如下:

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

    <TextView
        android:id="@+id/textView_from"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="SMS From"
        android:textAppearance="?android:attr/textAppearanceLarge" />



    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
         <TextView
        android:id="@+id/textView_sms"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="0.5"
        android:text="SMS : "  />

         <TextView
        android:id="@+id/textView_time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="right"
        android:text="Time : "  />

    </LinearLayout>

</LinearLayout>

muliple_selected_item.xml 如下:.

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

Answer 1

您需要为您的 ListView 设置 Multiple Select Choice 模式

smsListView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE_MODAL);

您需要为 ListView 的 行布局创建 Drawable 文件，并在该布局中使用 Drawable 作为背景。

这是可绘制文件:

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

编辑:

删除 selectView() 中使用的 changeBackgroundColor() 并检查它是否有效

可以引用这个Selecting multiple items in ListView .可能对你有帮助