Blank File is saved when using screencap programatically in Android

Question

code snippet

void takeSnapShot() 
    {
        Process process = null;
        try
        {
        process = Runtime.getRuntime().exec("/system/bin/screencap -p /sdcard/snapshot/test_2.png" );

        try
        {
            process.waitFor();
        } catch (InterruptedException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


        } catch (IOException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }




    }

I am gettin an empty file saved whereas If i use the same command through adb shell, i get my screen captured.

Any help will be appreciatable

score 0 · Answer 1 · edited May 23 '17 at 12:26

0

Edit: my previous answer was mistaken, any app can use the screen capture command.

It might be a permission issue. Are you sure you have permission to write to sdcard? Check this post, which covers your topic: How to run android system app without root permisson?

edited May 23 '17 at 12:26

Community

1
1

answered Apr 19 '13 at 13:04

tbkn23

5,205
8
26
46

score 0 · Answer 2 · answered Feb 27 '19 at 17:25

I solved this by adding the following permission to my Manifest.

<uses-permission
    android:name="android.permission.READ_FRAME_BUFFER"
    tools:ignore="ProtectedPermissions"/>

NOTE: This is a protected permission, my application is a system app and also signed using the platform key.

Blank File is saved when using screencap programatically in Android

2 Answers2