Creation file does not work in android

Question

I using the following code:

 String outputFile = "/mnt/sdcard/mydir/myApp.apk"
 File f = new File(outputFile);

 if(!f.exists())
       f.createNewFile();

 // *** other code ***

But when the application reaches the line

 f.createNewFile();

nothing appens. The other code linees are not executed and no error occurs.

The activity from where I executed this code is configured in manfiest in this way:

 <activity android:theme="@android:style/Theme.NoTitleBar" 
        android:name=".ACT_ImpostazioniAvanzate"  android:screenOrientation="landscape">
        <intent-filter>
            <action android:name="android.intent.action.VIEW" />
            <category android:name="android.intent.category.DEFAULT" />
            <data android:scheme="content" />
            <data android:scheme="file" />
            <data android:mimeType="application/vnd.android.package-archive" />
        </intent-filter>
    </activity>

This activity is not the main activity, and in the manifest I obtain the following Waring:

 "Exported activity does not require permission"

What does this mean? May be related to my creation file problem?

See there: http://stackoverflow.com/questions/9931662/android-permission-denied-when-creating-a-new-file-in-external-storage — Volodymyr, Oct 23 '12 at 16:41

score 2 · Accepted Answer · edited May 23 '17 at 12:21

2

Your warning is unrelated to your issue with creating files.

You don't have the proper permission set to write to the external storage on the device.

Add

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

to your manifest above the <activity tag

If you want more info about the warning in the manifest take a look at this answer here

edited May 23 '17 at 12:21

Community

1
1

answered Oct 23 '12 at 16:50

dymmeh

22,247
5
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With high reputation, You should flag duplicate question. – Trung Nguyen Oct 23 '12 at 16:55

score 0 · Answer 2 · answered Oct 23 '12 at 16:51

0

Be careful /mnt/sdcard/ may not work on all the devices, you should use Environment.getExternalStorageDirectory() and check also the permission in the manifest as said in the comments

answered Oct 23 '12 at 16:51

Damien Praca

3,126
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I know. The outputfile string is generated in this way: Environment.getExternalStorageDirectory().getAbsolutePath() + "/mydir/Host4.apk"; But this retrievs the /mnt/sdcard/... directory – GVillani82 Oct 23 '12 at 16:59

Creation file does not work in android

2 Answers2