Question

我当前正在使用nhaarman gridview，我想从自定义文件夹中获取位图。 gridview是片段，它将从“test”文件夹中提取图像并显示它。模拟器能够运行此代码，但不能在真实手机中运行。有人请帮忙。感谢。

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.activity_home_fragment_month, container, false);

    GridView gridView = (GridView) view.findViewById(R.id.activity_gridview_gv);


    //---------------------------------------------------------------------------
    file = new File(Environment.getExternalStorageDirectory()
            + File.separator + "Test");
    // Check for SD Card
    if (!Environment.getExternalStorageState().equals(
            Environment.MEDIA_MOUNTED)) {
        Toast.makeText(getActivity(), "Error! No SDCARD Found!", Toast.LENGTH_LONG)
                .show();
    } else {

        if(file.exists()==false){
            // Locate the image folder in your SD Card
            file = new File(Environment.getExternalStorageDirectory()
                    + File.separator + "Test");
            // Create a new folder if no folder named Test exist
            file.mkdirs();
        }
    }

    if (file.isDirectory()) {
        listFile = file.listFiles();
        // Create a String array for FilePathStrings
        FilePathStrings = new String[listFile.length];
        // Create a String array for FileNameStrings
        FileNameStrings = new String[listFile.length];

        for (int i = 0; i < listFile.length; i++) {
            // Get the path of the image file
            FilePathStrings[i] = listFile[i].getAbsolutePath();
            // Get the name image file
            FileNameStrings[i] = listFile[i].getName();
        }
    }

    SwingBottomInAnimationAdapter swingBottomInAnimationAdapter = new SwingBottomInAnimationAdapter(new MyAdapter(getActivity().getApplicationContext(), getItems()));
    swingBottomInAnimationAdapter.setAbsListView(gridView);
    swingBottomInAnimationAdapter.setInitialDelayMillis(300);

    adapter = new GridViewAdapter(getActivity(), FilePathStrings, FileNameStrings);
    //gridView.setAdapter(swingBottomInAnimationAdapter);
    gridView.setAdapter(adapter);

    return view;
}

公共类GridViewAdapter扩展了BaseAdapter {

    // Declare variables
    private Context activity;
    private String[] filepath; 

 // file path , Environment.getExternalStorageDirectory()+ File.separator +        "test"
    private String[] filename;

    private LayoutInflater inflater = null;

    public GridViewAdapter(Context a, String[] fpath, String[] fname) {
        activity = a;
        filepath = fpath;
        filename = fname;
        inflater = (LayoutInflater) activity
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    }

    public int getCount() {
        return filepath.length;

    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {

        ImageView imageView = (ImageView) convertView;

        if (imageView == null) {
            imageView = new ImageView(activity);
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        }

        // Decode the filepath with BitmapFactory followed by the position
        Bitmap bmp = BitmapFactory.decodeFile(filepath[position]);

        // Set the decoded bitmap into ImageView
        imageView.setImageBitmap(bmp);

        return imageView;
    }
}

Answer 1

您是在设备上部署apk还是使用它进行测试？因为如果要在真实设备上部署apk，添加权限可能是一个问题。

来自SD卡中自定义文件夹的Gridview适配器

1 个答案: