在Gallery View中显示来自SD卡文件夹的图像（Android）

Question

我正在开发Android应用程序。我的应用程序我想在Gallery视图中从SD卡文件夹中显示图像。我正在使用baseawapter。我试图从我项目中的资源文件夹中的Drawable文件夹中显示图像，它正常工作。 我尝试了以下代码：

public class ImageAdapter extends BaseAdapter {

private Context context;  
public static Integer[] imageIDs={  
        R.drawable.sp1,R.drawable.sp2,
        R.drawable.sp3,R.drawable.sp4,
        R.drawable.sp5,R.drawable.sp6,
        R.drawable.sp7,R.drawable.sp8,
        R.drawable.sp9
};

public ImageAdapter(Context context){  
    this.context=context;  
}  
@Override
public int getCount() {
    // TODO Auto-generated method stub
    return imageIDs.length;
}

@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return position;
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return position;
}

@Override
public View getView(int position, View 
        convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    ImageView image=new ImageView(context);  
    image.setImageResource(imageIDs[position]);  
    image.setAdjustViewBounds(true);  
    image.setLayoutParams(new Gallery.LayoutParams(120,120));  
    image.setScaleType(ImageView.ScaleType.FIT_CENTER);
    return image;  
}

. 现在我想从SD卡文件夹显示图像，并以图库格式显示它们。 为此，我试图在数组中获取所有图像，但我不知道如何以阵列格式获取它们。我可以按照以下方式在SD文件夹中访问我的图像。

File path = new File(Environment.getExternalStorageDirectory()+"/download/sp1.jpg");

.

如何以阵列格式获取它们，并在Gallery View中显示它们.Oor是否有任何其他备用方式来显示它们而不是数组？

需要帮助....谢谢....

Answer 1

请参阅以下代码

if (android.os.Environment.getExternalStorageState().equals(
            android.os.Environment.MEDIA_MOUNTED)) {

        // It have to be matched with the directory in SDCard
        boolean exist = new File(Environment.getExternalStorageDirectory()
                + File.separator + "download").exists();
        if (exist) {
            File f = new File(Environment.getExternalStorageDirectory()
                    + File.separator + "download");

            File[] files = f.listFiles();
            File file;
            for (int i = 0; i < files.length; i++) {
                file = files[i];
                Bitmap bitmap = decodeFile(file);
                return bitmap;      
            }
        }
    }

.

你可以这样做

@Override
public int getCount() {
    // TODO Auto-generated method stub
    return files.length;
}



@Override
public View getView(int position, View 
        convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    ImageView image=new ImageView(context);  

    //image.setImageResource(imageIDs[position]);  
    File file = files[position]
    Bitmap bitmap = decodeFile(file);
    image.setImageBitmap(bitmap);

    image.setAdjustViewBounds(true);  
    image.setLayoutParams(new Gallery.LayoutParams(120,120));  
    image.setScaleType(ImageView.ScaleType.FIT_CENTER);
    return image;  
}

.

Answer 2

您需要将图像加载为位图：

getView(...){
File f = new File(directory, filename);
Bitmap bitmap = BitmapFactory.decodeFile(f.getPath());
...
ImageView image=new ImageView(context);
image.setImageBitmap(bitmap);
}

.