Question

我正在尝试将自定义图像适配器与fragment和Activity结合使用。当我使用几乎相同的代码只有一个fragment时，代码工作正常。但当我使用public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment View rootView = inflater.inflate(R.layout.fragment_main, container, false); GridView gridView = (GridView)rootView.findViewById(R.id.thumbnail_grid); thumbnails = new ImageAdapter(getActivity()); gridView.setAdapter(thumbnails); return rootView; } public class ImageAdapter extends BaseAdapter { private Context mContext; private Integer[] mThumbIds ={ R.drawable.test, R.drawable.test2 }; public ImageAdapter(Context c) { mContext = c; } public int getCount() { return 0; //FOR NOW } public Object getItem(int position) { return mThumbIds[position]; } public long getItemId(int position) { return 0; } // create a new ImageView for each item referenced by the Adapter public View getView(int position, View convertView, ViewGroup parent) { ImageView imageView; if (convertView == null) { // if it's not recycled, initialize some attributes imageView = new ImageView(mContext); imageView.setLayoutParams(new GridView.LayoutParams(85, 85)); imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); imageView.setPadding(8, 8, 8, 8); } else { imageView = (ImageView) convertView; } //test with drawable folder imageView.setImageResource(mThumbIds[position]); return imageView; } }时，图像不再显示。以下是相关代码

注意：缩略图是我的片段类的全局变量

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.ghanghan.popularmovies.MoviesFragment">

    <GridView
        android:id="@+id/thumbnail_grid"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:numColumns="auto_fit"
        android:stretchMode="columnWidth"
        android:gravity="center">

    </GridView>

</FrameLayout>

和我的布局

.preview-iframe {
    width: 100%;
    height: 100%;
    border: 0;

    max-width: 1280px;
    max-height: 720px;
    margin: auto;
}

Answer 1

看看你的getCount()。它应该返回2。

 public int getCount() {
        return 0; //FOR NOW
    }

使用带有片段的ImageAdapter

1 个答案: