fragment inner static class and gradle issues - android-dialogfragment

Question

Initially I was getting an error "This fragment inner class should be static" in the following code:
public class Activity4 extends FragmentActivity {
EditText mEdit;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_activity4);
}
public void selectDate(View view) {
DialogFragment newFragment = new SelectDateFragment();
newFragment.show(getSupportFragmentManager(), "DatePicker");
}
public void populateSetDate(int year, int month, int day) {
mEdit = (EditText) findViewById(R.id.editText);
mEdit.setText(day + "/" + month + "/" + year);
}
//error was here at SelectDateFragment
public class SelectDateFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final Calendar calendar = Calendar.getInstance();
int yy = calendar.get(Calendar.YEAR);
int mm = calendar.get(Calendar.MONTH);
int dd = calendar.get(Calendar.DAY_OF_MONTH);
return new DatePickerDialog(getActivity(), this, yy, mm, dd);
}
public void onDateSet(DatePicker view, int yy, int mm, int dd) {
populateSetDate(yy, mm + 1, dd);
}
}
}
I tried to figure out the solution & read on some post here that its a lint error and can be resolved by adding this to the gradle file:
lintOptions {
abortOnError false
}
but when I did that, I get the message that "cannot resolve symbol getDefaultProguardFile". This is my gradle file:
apply plugin: 'com.android.application'
android {
compileSdkVersion 22
buildToolsVersion "22.0.1"
defaultConfig {
applicationId "com.sample.pat1"
minSdkVersion 16
targetSdkVersion 22
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
lintOptions {
abortOnError false
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:22.2.0'
}
And the previous error "This fragment inner class should be static" still persists. Surprisingly the app works just fine despite all this.. but I would like to know where I'm going wrong.. Please help!

Answer 1

If you don't want to rewrite the communication mechanic, you can mark fragment as a valid manually:
#SuppressLint("ValidFragment")
DialogFragment newFragment = new SelectDateFragment();
More description here
P.S. Proguard - it's totally another issue.