Android 阅读ArrayList<；字符串>；将URI导入coverflow应用程序，而不是R.drawables

我正在将MediaStore.Images.Media.DATA字符串从ArrayList读取到一个数组中，这样我就可以使用SD卡中的图像，而不是coverflow gallery应用程序的R.drawable文件夹中的图像。撞到了一堵砖墙。与读取整数类型与字符串类型的图像信息的问题

能够从SD卡的所有图像中获取URI到arraylist，但不知道下一步要做什么

是否值得继续使用这种方法，还是最好放弃这种方法，尝试另一种方法来完成将此coverflow应用程序的图像源从R.drawables文件夹更改为SD卡的任务

这就是我所做的

首先，以下是它使用数组从android中的R.drawable文件夹获取图像的方式：

      public class ImageAdapter extends BaseAdapter {
       int mGalleryItemBackground;
       private Context mContext;

       private FileInputStream fis;

      // private Integer[] mImageIds = {
       //       R.drawable.pic01,
         //      R.drawable.pic02,
            //    R.drawable.pic03,
            //  R.drawable.pic04,
           //   R.drawable.pic05,
           //   R.drawable.pic06,
          //   R.drawable.pic07,
         //     R.drawable.pic08,
        //    R.drawable.pic09
       //   };

       private ImageView[] mImages;

我的想法是使用光标从SD卡中读取URI，如“//mnt/sdcard/pic01.png”，并使用这些地址，而不是数组中R.drawable中的地址，如数组中的“R.drawable.pic02”

这就是我所做的，这部分工作没有任何问题： 我从SD卡上的图像中获取了所有URI，并将它们存储在arrayList中，到目前为止，一切都很正常。通过使用Toast在活动屏幕上显示加载的uri，我验证了它可以完美地工作

       ArrayList<String> list1 = new ArrayList<String>();

    String[] proj = {MediaStore.Images.Media.DATA};
    Cursor cur = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, proj, null, null, null);
    if (cur.getCount() > 0) {
        while (cur.moveToNext()) {
            String pic = cur.getString(cur.getColumnIndex(MediaStore.Images.Media.DATA));
            list1.add(pic);
        //    Toast.makeText(CoverFlowExample.this, "data name: " + pic, Toast.LENGTH_SHORT).show();
         //   Log.d("TAG", "ID: " + pic);
        }
       }
    cur.close();

下面是应用程序getview部分的其余代码：我现在正试图找出下一步要做什么

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

        //Use this code if you want to load from resources from external source
        ImageView i = new ImageView(mContext);

            // this method is what someone suggested to use but i don't know how to use this, what do i put for "image" and how to read URIs from arrayList to this?
        i.setImageBitmap(BitmapFactory.decodeFile("image_" + position));

            // this works for reading in only one image from the SD card into the coverflow app
        i.setImageBitmap(BitmapFactory.decodeFile("/mnt/sdcard/pic04.png"));

   // when getting from R.drawable images　-->  i.setImageResource(mImageIds[position]);

        i.setLayoutParams(new CoverFlow.LayoutParams(130, 130));
        i.setScaleType(ImageView.ScaleType.MATRIX);         
        return i;

        //return mImages[position];
    }

---

由于已经有了URI/文件系统路径，因此可以使用

Drawable

的

createFrom*

方法之一加载它

      mImageIds[t]= list1.get(t);

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

        //Use this code if you want to load from resources from external source
        ImageView i = new ImageView(mContext);

            // this method is what someone suggested to use but i don't know how to use this, what do i put for "image" and how to read URIs from arrayList to this?
        i.setImageBitmap(BitmapFactory.decodeFile("image_" + position));

            // this works for reading in only one image from the SD card into the coverflow app
        i.setImageBitmap(BitmapFactory.decodeFile("/mnt/sdcard/pic04.png"));

   // when getting from R.drawable images　-->  i.setImageResource(mImageIds[position]);

        i.setLayoutParams(new CoverFlow.LayoutParams(130, 130));
        i.setScaleType(ImageView.ScaleType.MATRIX);         
        return i;

        //return mImages[position];
    }