특정 폴더가 없으면 만들고, 있으면 true로 return
Pemission Required
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
refer to blackRecords.apk
boolean readyPackageFolder (File dir){
try {
if (!dir.exists()) return dir.mkdirs();
else
return true;
} catch (Exception e) {
Log.e("creating Folder error", dir + "_" + e.toString());
}
return false;
}
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