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<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"></uses-permission>
<uses-permission android:name="android.permission.READ_OWNER_DATA"></uses-permission>
<uses-permission android:name="android.permission.WRITE_OWNER_DATA"></uses-permission>
FILE* file = fopen("/data/data/com.test.w4e/files/Hello.txt","rw");
if (file != NULL)
{
LOGI("ready to write file");
fputs("HELLO WORLD!\n", file);
fflush(file);
fclose(file);
}