在Android API中创建目录22(棒棒糖)和23(棉花糖)

Question

我正在开发一个android应用程序，该应用程序要求将文件（图像）保存在设备上，以便以后访问。我需要创建一个目录（文件夹），然后把这些东西（图像）放进去我在API 19（Kitkat）上运行了这段代码，但在棒棒糖和最新的棉花糖上不起作用。

代码

 String stored = null;
    File sdcard = Environment.getExternalStorageDirectory() ;

    File folder = new File(sdcard.getAbsoluteFile() , "PropertyImages");
    Log.i("Folder Name",folder.toString());
    if (folder.exists()){
        Log.w("Folder Exist","Folder Exists");
    }else{
        Log.w("Folder NOT Exist","Folder NOT Exist");
    }
    if (folder.mkdir()){
        Log.w("Folder Created","Folder Created");
    }else{
        Log.w("Folder is NOT Created","Folder is NOT  Created");
    }
    File file = new File(folder.getAbsoluteFile(), filename + ".jpg") ;
    if (file.exists())
        return stored ;
    try {
        FileOutputStream out = new FileOutputStream(file);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
        out.flush();
        out.close();
        stored = "success";
    } catch (Exception e) {
        e.printStackTrace();
    }
    return stored;
}

在基特成功了。在棒棒糖和以上它给文件没有创建

舱单

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

Answer 1

最后我解决了它。感谢@greenapps和@GreyBeardedGeek。@greenapp帮了我很多忙，让我对getExternalFilesDir（）进行了研究和阅读这是我的解决方案，以防将来有人需要

public static String createExternalStoragePrivateFile(Bitmap bitmap,String imagename,Context ctx) {
    File file = new File(ctx.getExternalFilesDir("PW"), imagename + "jpg");
String stored= "Stored";
    try
    {
        // Very simple code to copy a picture from the application's
        // resource into the external file.  Note that this code does
        // no error checking, and assumes the picture is small (does not
        // try to copy it in chunks).  Note that if external storage is
        // not currently mounted this will silently fail.
        FileOutputStream out = new FileOutputStream(file);
        bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
        out.flush();
        out.close();
    }
    catch(
            IOException e
            )
    {
        // Unable to create file, likely because external storage is
        // not currently mounted.
        Log.w("ExternalStorage", "Error writing ");
    }
    return stored;
}