从 SD 卡中删除文件时出错答案

【问题标题】：Error while deleting a file from SD card从 SD 卡中删除文件时出错
【发布时间】：2016-08-24 10:09:24
【问题描述】：

当我删除文件时，代码正在运行并向我显示已删除文件的 toast，但不从 SD 卡删除它。代码如下：

delete_btn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v){
             fn = baseAppDir.getPath()+ File.separator + folderName + File.separator
                     + folderName + "_" + Integer.toString(imgNo) + ".jpg";
            FileName = folderName + "_" + Integer.toString(imgNo)
                    + ".jpg";


            if (FileName!=null)
            {
                  deleteFile(FileName);
                Toast.makeText(ImageCaptureActivity.this, "Deleted",
                        Toast.LENGTH_LONG).show();
                image1.setVisibility(View.GONE);


                } else {
                Toast.makeText(ImageCaptureActivity.this, "Not Deleted",
                        Toast.LENGTH_LONG).show();
                }



        }});

【问题讨论】：

显示您的 toast 是因为 FileName!=null。没有其他原因。在显示 toast 之前，您应该检查 deleteFile() 的返回值。
"Not Deleted"。那应该是FileName==null。
如果你不给我们错误代码，我们怎么知道发生了什么？

标签： android image android-studio android-camera

【解决方案1】：

看看下面的：Delete a file

你可以这样做：

try {
        deleteFile(FileName);
        Toast.makeText(ImageCaptureActivity.this, "Deleted", Toast.LENGTH_LONG).show();
        image1.setVisibility(View.GONE);
    } catch (NoSuchFileException x) {
        System.err.format("%s: no such" + " file or directory%n", path);
    } catch (DirectoryNotEmptyException x) {
        System.err.format("%s not empty%n", path);
    } catch (IOException x) {
        // File permission problems are caught here.
        System.err.println(x);
    }

【讨论】：

【解决方案2】：

试试这个可能也很有帮助..

File dir = new File(Environment.getExternalStorageDirectory() + "/DCIM/Camera");
    Log.e(TAG, " get path ..**... " + dir.getPath());
    Log.e(TAG, " get Directory ..**... " + dir.isDirectory());
    Log.e(TAG, " get Name  ..**... " + dir.getName());
    Log.e(TAG, " get strign  ..**... " + dir.list());
    if (dir.isDirectory()) {
        String[] children = dir.list();
        Log.e(TAG, " children .... ... " + children.length);
        for (int i = 0; i < children.length; i++) {
            Log.e(TAG, "Delete old Image ...");
            new File(dir, children[i]).delete();
        }
    }

这是从SD 卡中删除多个图像的代码。

【讨论】：

【解决方案3】：

替换

if (FileName!=null) {
     deleteFile(FileName);
     Toast.makeText(ImageCaptureActivity.this, "Deleted",
                    Toast.LENGTH_LONG).show();
     image1.setVisibility(View.GONE);
} else {
    Toast.makeText(ImageCaptureActivity.this, "Not Deleted",
                    Toast.LENGTH_LONG).show();
}

与

File file = new File(FileName);
if (file.delete()){
       Toast.makeText(ImageCaptureActivity.this, "Deleted",
                        Toast.LENGTH_LONG).show();
       image1.setVisibility(View.GONE);
} else {
       Toast.makeText(ImageCaptureActivity.this, "Not Deleted",
                        Toast.LENGTH_LONG).show();

}

【讨论】：