android mkdirs not working

问题

i need to save an image from camera on android. i used the write external storage permission in manifest and i am using this code

File dir = new File(Environment.getExternalStorageDirectory(), "Test");
if (!dir.exists() || !dir.isDirectory())
    dir.mkdirs();

String path = dir.getAbsolutePath();
Log.d(TAG, path);                     //log show the path
File file = new File(dir.getAbsolutePath() + "/Pic.jpg");
Log.d(TAG, file.getAbsolutePath());   //again path is shown here

outStream = new FileOutputStream(file);
outStream.write(bytes);
outStream.close();
Log.d(TAG, "onPictureTaken - wrote bytes: " + bytes.length);   //fail here
} catch (FileNotFoundException e) {
Log.d(TAG, "not done");                       //error is here (this exception is thrown)
} catch (IOException e) {
Log.d(TAG, "not");
} finally {  }

i also tried mkdir() instead of mkdirs() same result.

any idea what went wrong in the code?

thanks

回答1:

For those not as experienced like me. I fought this issue, lost hair for some time. I am targeting api 21 (for compatibility sake) and it worked on lollipop but on marshmallow it would not create the directory. I did have the "uses" permission in the manifest but it still would not work. Apparently in Marshmallow when you install with Android studio it never asks you if you should give it permission it just quietly fails, like you denied it. You must go into Settings, apps, select your application and flip the permission switch on.

回答2:

IDIOT ME! i have used the Manifest Permission but when installed the app on phone i didnt grant permission for storage!... i understand a negative on this question... but i hope if someone else face the same..check your phone permission. sorry all for inconvenience.

回答3:

if you are testing on android M, you should probably check Settings > App > Permission to see if permission to access storage is granted. This saved me.

回答4:

Did you put

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

in your AndroidManifest? If you are using android M you must request user permission to write on sd, look here an example

回答5:

you have created directory, not file. Create new file with following code

File file = new File(dir.getAbsolutePath() + "/Pic.jpg");
file.createNewFile()

回答6:

Try this. Provide runtime permission for marshmallow it is perfectly work in my Application code :

 private String getFilename(String strFileName) {
        String filepath = Environment.getExternalStorageDirectory().getPath();
        File fileBase = new File(filepath, "Test");
        if (!fileBase.exists()) {
            fileBase.mkdirs();
        }
        return (file.getAbsolutePath() + "/" + strFileName + file_exts[currentFormat]);
    }

new File(getFilename(edt.getText().toString().trim()))

来源：https://stackoverflow.com/questions/40087355/android-mkdirs-not-working

标签

android

mkdirs