Question

我有一个显示图像列表的gridview，我为这个gridview实现了选择模式监听器。问题是，当我按下长按以选择一组图像时，它们不会突出显示..

item_photo.xml

<?xml version="1.0" encoding="utf-8"?>
<ImageView
    android:id="@+id/photo"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:adjustViewBounds="true"
    android:contentDescription="@string/media_thumbnail"/>

fragment_photos.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent">

    <!-- Empty View -->
    <RelativeLayout
        android:id="@+id/empty_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="gone">

        <ImageView
            android:id="@+id/download_arrow"
            android:layout_width="90dp"
            android:layout_height="90dp"
            android:layout_centerInParent="true"
            android:contentDescription="@string/downloads"
            android:src="@drawable/ic_photo"/>

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/download_arrow"
            android:layout_centerInParent="true"
            android:layout_marginLeft="32dp"
            android:layout_marginRight="32dp"
            android:gravity="center"
            android:text="@string/no_media"/>
    </RelativeLayout>

    <!-- Photos List -->
    <GridView
        android:id="@+id/list"
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:horizontalSpacing="10dp"
        android:numColumns="3"
        android:paddingBottom="5dp"
        android:choiceMode="multipleChoiceModal"
        android:paddingTop="5dp"
        android:stretchMode="columnWidth"
        android:verticalSpacing="10dp"
        android:visibility="gone"/>

</RelativeLayout>

PhotosFragment.java

public class PhotosFragment extends Fragment
{
    @Bind (R.id.list)
    GridView mGridView;

    private MediaGridAdapter mAdapter;
    private ArrayList<File> mFiles;


    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        View view = inflater.inflate(R.layout.fragment_media, container, false);
        ButterKnife.bind(this, view);

        mGridView.setMultiChoiceModeListener(new MultiChoiceModeListener());

        // set adapter and fetch files code ....

        return view;
    }
}

Answer 1

没有神奇的高光效果，你必须自己实现它，例如设置一个半透明灰色的前景drawable。

长按选择时，在gridview上突出显示图像视图

1 个答案: