Question

我正在尝试将图片从资产文件夹复制到SD卡，但似乎并没有在首次启动时复制它。它可以创建文件夹，但不会复制文件。

prefs = getPreferences(Context.MODE_PRIVATE);
    if (prefs.getBoolean("firstLaunch", true)) {
        prefs.edit().putBoolean("firstLaunch", false).commit();
    File nfile=new File(Environment.getExternalStorageDirectory()+"/My Images");
    nfile.mkdir();
    }
    AssetManager assetManager = getAssets();
    String[] files = null;
    try {
        files = assetManager.list("middle.jpg");
    } catch (IOException e) {
        Log.e("tag", "Failed to get asset file list.", e);
    }
    for(String filename : files) {
        InputStream in = null;
        OutputStream out = null;
        try {
          in = assetManager.open(filename);
          File outFile = new File(Environment.getExternalStorageDirectory()+ "/My Images" + filename);
          out = new FileOutputStream(outFile);
          copyFile(in, out);
        } catch(IOException e) {
            Log.e("tag", "Failed to copy asset file: " + filename, e);
        }     
        finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {

                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {

                }
            }
        }  
    }

   private void copyFile(InputStream in, OutputStream out) {
    // TODO Auto-generated method stub

}

middle.jpg是我要复制的文件。谁能告诉我我做错了什么？

PS我的清单中有WRITE_EXTERNAL_STORAGE。

由于

Answer 1

在构建路径

时，您忘记在/我的图像的末尾添加/

File outFile = new File(Environment.getExternalStorageDirectory()+ "/My Images/" + filename); out = new FileOutputStream(outFile);

因为文件名是MyImages + Filename所以它不存在复制。

将文件从资产文件夹复制到SD卡似乎不起作用

1 个答案: