android - 如何在 WhatsApp 或 Allo 等内部存储中创建文件夹？

Question

我的任务是将位图保存在内部存储器中。我尝试了所有方法。我无法获得所需的输出。在文件夹中创建并保存在内部设备中的文件夹 数据/用户/0/数据/~~。 --试过

File mediaFile = new File(c.getExternalCacheDir(), "/MaherSaad");

工作并在缓存中创建文件夹 -- android/data/com.myapp.~/cache

我想创建文件夹并显示成那样

内部存储/Myapp/newFolder

Answer 1

终于找到解决办法了 在数据文件夹外创建一个文件夹

简单地

File mFolder = new File(Environment.getExternalStorageDirectory(), "Folder_Name");
            if (!mFolder.exists()) {
                boolean b =  mFolder.mkdirs();

            }

错误是没有处理运行时权限 代码简单...

String TAG = "Permsission : ";
        if (Build.VERSION.SDK_INT >= 23) {
            if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
                    == PackageManager.PERMISSION_GRANTED) {
                Log.v(TAG,"Permission is granted");
                return true;
            } else {

                Log.v(TAG,"Permission is revoked");
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
                return false;
            }
        }
        else { //permission is automatically granted on sdk<23 upon installation
            Log.v(TAG,"Permission is granted");
            return true;
        }

处理权限

@Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        String TAG = "Permsission : ";
        if(grantResults[0]== PackageManager.PERMISSION_GRANTED){
            Log.v(TAG,"Permission: "+permissions[0]+ "was "+grantResults[0]);
            //resume tasks needing this permission
            //Define the path you want
            File mFolder = new File(Environment.getExternalStorageDirectory(), "Folder_Name");
            if (!mFolder.exists()) {
                boolean b =  mFolder.mkdirs();

            }
        }
    }