java - 从Android手机的SD卡中删除文件

Question

我想删除 SD 卡上名为“playerdata.txt”的文件。以下代码无效

{
    File file = new File("/sdcard/GameHacker/playerdata.txt");
    file.delete();
}

我的问题是我想将“playerdata.txt”复制到名为 GameHacker 的文件夹中，我使用此代码

Context Context = getApplicationContext();

String DestinationFile = "/sdcard/GameHacker/playerdata.txt";
if (!new File(DestinationFile).exists()) {
  try {
    CopyFromAssetsToStorage(Context, "playerdata", DestinationFile);
  } catch (IOException e) {
    e.printStackTrace();
  }
}
}

private void CopyFromAssetsToStorage(Context Context, String SourceFile, String DestinationFile) throws IOException {
  InputStream IS = Context.getAssets().open(SourceFile);
  OutputStream OS = new FileOutputStream(DestinationFile);
  CopyStream(IS, OS);
  OS.flush();
  OS.close();
  IS.close();
}
private void CopyStream(InputStream Input, OutputStream Output) throws IOException {
  byte[] buffer = new byte[5120];
  int length = Input.read(buffer);
  while (length > 0) {
    Output.write(buffer, 0, length);
    length = Input.read(buffer);

  }

}

它工作正常，但第二次它没有替换它，我想先删除它，然后复制并添加

> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

显化

Answer 1

添加

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

在AndroidManifest.xml文件中