Creating Directory In Internal Storage

I think that my smartphone is a dumbphone. Trying to create a folder and it seems that it just wont get created. I am running CyanogenMod and dont know if this make it goes nuts. T

Solution 1:

This answer was old and I updated it. I included internal and external storage. I will explain it step by step.

Step 1 ) You should declare appropriate Manifest.xml permissions; for our case these 2 is enough. Also this step required both pre 6.0 and after 6.0 versions :

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

Step 2 ) In this step we will check permission for writing external storage then will do whatever we want.

publicstaticintSTORAGE_WRITE_PERMISSION_BITMAP_SHARE=0x1;

public Uri saveBitmapToFileForShare(File file,Uri uri){
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN
    && ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED) {

//in this side of if we don't have permission //so we can't do anything. just returning null and waiting user action

    requestPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE,
   "permission required for writing external storage bla bla ..."
                REQUEST_STORAGE_WRITE_ACCESS_PERMISSION);
        returnnull;
    }else{
        //we have right about using external storage. do whatever u want.
        Uri returnUri=null;
        try{
            FileOutputStreamfileOutputStream=newFileOutputStream(file);
            Bitmapbitmap= MediaStore.Images.Media.getBitmap(getContentResolver() ,uri);
            bitmap.compress(Bitmap.CompressFormat.PNG, 100, fileOutputStream);
            fileOutputStream.flush();
            fileOutputStream.close();
            returnUri=Uri.fromFile(file);
        }
        catch (IOException e){
            //can handle for io exceptions
        }

        return returnUri;
    }

}

Step 3 ) Handling permission rationale and showing dialog, please read comments for info

/**
 * Requests given permission.
 * If the permission has been denied previously, a Dialog will prompt the user to grant the
 * permission, otherwise it is requested directly.
 */protectedvoidrequestPermission(final String permission, String rationale, final int requestCode) {
    if (ActivityCompat.shouldShowRequestPermissionRationale(this, permission)) {
        showAlertDialog("Permission required", rationale,
                newDialogInterface.OnClickListener() {
                    @OverridepublicvoidonClick(DialogInterface dialog, int which) {
                        ActivityCompat.requestPermissions(BasePermissionActivity.this,
                                newString[]{permission}, requestCode);
                    }
                }, getString(android.R.string.ok), null, getString(android.R.string.cancel));
    } else {
        ActivityCompat.requestPermissions(this, newString[]{permission}, requestCode);
    }
}

/**
 * This method shows dialog with given title & content.
 * Also there is an option to pass onClickListener for positive & negative button.
 *
 * @paramtitle                         - dialog title
 * @parammessage                       - dialog content
 * @paramonPositiveButtonClickListener - listener for positive button
 * @parampositiveText                  - positive button text
 * @paramonNegativeButtonClickListener - listener for negative button
 * @paramnegativeText                  - negative button text
 */protectedvoidshowAlertDialog(@NullableString title, @NullableString message,
                               @Nullable DialogInterface.OnClickListener onPositiveButtonClickListener,
                               @NonNullString positiveText,
                               @Nullable DialogInterface.OnClickListener onNegativeButtonClickListener,
                               @NonNullString negativeText) {
    AlertDialog.Builder builder = newAlertDialog.Builder(this);
    builder.setTitle(title);
    builder.setMessage(message);
    builder.setPositiveButton(positiveText, onPositiveButtonClickListener);
    builder.setNegativeButton(negativeText, onNegativeButtonClickListener);
    mAlertDialog = builder.show();
}

Step 4 ) Getting permission result in Activity :

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    switch (requestCode) {
        caseSTORAGE_WRITE_PERMISSION_BITMAP_SHARE:
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                shareImage();
            }elseif(grantResults[0]==PackageManager.PERMISSION_DENIED){
                //this toast is calling when user press cancel. You can also use this logic on alertdialog's cancel listener too.Toast.makeText(getApplicationContext(),"you denied permission but you need to give permission for sharing image. "),Toast.LENGTH_SHORT).show();
            }
            break;
        default:
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}

Step 5 ) In case of using internal storage. You don't need to check runtime permissions for using internal storage.

//this creates a png file in internal folder//the directory is like : ......data/sketches/my_sketch_437657436.pngFilemFileTemp=newFile(getFilesDir() + File.separator
                + "sketches"
                , "my_sketch_"
                + System.currentTimeMillis() + ".png");
        mFileTemp.getParentFile().mkdirs();

You can read this page for information about runtime permissions : runtime permission requesting

My advice : You can create an Activity which responsible of this permissions like BasePermissionActivity and declare methods @Step 3 in it. Then you can extend it and call your request permission where you want.

Also I searched a bit and found the Github link of codes @Step 3 in case of you want to check : yalantis/ucrop/sample/BaseActivity.java

Solution 2:

You forgot to add the "/" before adding the file name so your path is compiled like this:

/data/data/com.myPackageNametheFolder

Filefolder=newFile(getFilesDir() + "/" + "theFolder");

OR

Filefolder=newFile(getFilesDir(),"theFolder");

You'll get this instead

/data/data/com.myPackageName/theFolder

PS : There is no dumb phone all phones are Smart Phones 'Bad dum tss'