無法在Android中刪除文件

Question

我從StackOverflow嘗試了我的解決方案，但無法從android中刪除文件

我得到了運行時間的許可。 它在適配器中

File file = new File(/storage/emulated/0/WhatsApp/Media/WhatsApp Video/VID-20190406-WA0004.mp4/VID-20190406-WA0004.mp4
);
                boolean deleted = file.delete();
                file.deleteOnExit();
                Log.d("Delete", String.valueOf(deleted));

                if (!deleted) {
                    boolean deleted2 = false;
                    deleted2 = file.getAbsoluteFile().delete();
                    Log.d("Delete", String.valueOf(deleted2));
                    if (!deleted2) {
                        String dir = file.getAbsolutePath();
                        File f0 = new File(dir, file.getName());
                        boolean d0 = f0.delete();
                        Log.d("Delete", String.valueOf(f0));
                    }
                }

Answer 1

如果您還沒有，請為AndroidManifest.xml添加所需的權限：

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

然后，您應該在MainActivity中的onCreate()方法上實現運行時權限。

ActivityCompat.requestPermissions(MainActivity.this,
            new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);

如果授予權限，則刪除文件

  @Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    switch (requestCode) {
        case 1:
            // delete file
         break;
    }
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}

在f0.delete（）之后還從媒體掃描程序掃描文件

MediaScannerConnection.scanFile(context, new String[]{dir}, null, null);