如何使用 Android 删除外部文件夹？

Question

我一直在寻找它，但我的问题没有任何答案。我正在编写一个应用程序，我想删除一个外部文件夹。例如/storage/emulated/0/MyFolder，有很多方法可以从内部应用程序文件夹和外部应用程序文件夹创建和读取文件，但我不知道如何访问“/storage/emulated/0/... ".

谢谢。

Answer 1

  public static void deleteDir(Context ctx) {

        try {
            File myFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath()
                                + File.separator
                                + "MyFolder");
            }
            if (myFile.exists()) {
                deleteRecursive(myFile);
            }
        }catch (Exception ignored){
            Log.e("Delete error File: %s",ignored.getMessage());
        }
    }

    private static void deleteRecursive(File myFile) {
        if (myFile.isDirectory())
            for (File child : myFile.listFiles())
                deleteRecursive(child);
        Log.e("MyFolder Files Deleted!!! : %s", myFile.delete());
    }

将此行添加到应用程序 manifest.xml

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

更新 - 如 CommonsWare 所述，Android 6+

需要运行时权限请求

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN
            && ActivityCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(context, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 101);
    } else {
        deleteDir(context);
    }

你的Activity

  @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode) {
            case 101:
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    deleteDir(context);
                }
        }
    }

Answer 2

new File("/storage/emulated/0/MyFolder").delete();

@你的manifest.xml

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

更新： 正如 CommonsWare hardcoded filesystem paths might be invalid for some versions of Android.

所述

new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/MyFolder").delete();

如何使用 Android 删除外部文件夹？

How can I delete an external folder with Android?

java

android

file-manager