Date format in android

    public String f_dateFormat(String cdate, String dateToFormat) {
//        String cdate = "2013-05-15T10:00:00-0700";
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm");
        Date date = null;
        try {
            date = dateFormat.parse(cdate);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        DateFormat df = new SimpleDateFormat("dd-MMM-yyyy");
        String sdate = df.format(date);
        //now you can use Date class function i.e.
        //date.getDay();
        //date.getMonth();
        //date.getYear();
        return sdate;
    }

Read only

1. Read only or not editable

 android:editable="false"

<EditText
    android:id="@+id/et_test_id"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="10dp"
    android:layout_marginTop="40dp"
    android:hint="ID"
    android:textSize="20sp"
    android:editable="false"
    />

DropDownList

1. DropDownList  in android studio

<Spinner
    android:id="@+id/spinner1"
    android:layout_width="253dp"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:contentDescription="sss"
    android:minHeight="48dp"
    android:padding="8dp" />

Equal size in xml

1.  Fix equal size or equal width in xml

android:layout_weight="1"

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    tools:context=".MainActivity">

<Button
    android:id="@+id/idBtnPost"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_margin="20dp"
    android:text="Save"
    android:layout_weight="1"
    android:textAllCaps="false" />
<Button
    android:id="@+id/btn_back"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_margin="20dp"
    android:text="Go Back"
    android:layout_weight="1"
    android:textAllCaps="false" />
</LinearLayout>

Set Images

1. Button in fragment

android:drawableLeft="@drawable/ic_baseline_search_24"

<Button
    android:id="@+id/btn_search"
    android:layout_width="48dp"
    android:layout_height="48dp"
    android:layout_marginEnd="8dp"
    android:layout_marginRight="8dp"
    android:layout_weight="1"
    android:contentDescription="Search"
    android:drawableLeft="@drawable/ic_baseline_search_24"
    app:layout_constraintBaseline_toBaselineOf="@+id/et_name"
    app:layout_constraintEnd_toStartOf="@+id/progressBar1" />

2. Image Button in fragment

android:src="@drawable/ic_baseline_close_24"

<ImageButton
    android:id="@+id/imgBtn_from"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical"
    android:contentDescription="From Date Cancel"
    android:minWidth="48dp"
    android:minHeight="48dp"
    android:padding="0dp"
    android:src="@drawable/ic_baseline_close_24" />

Region

In Java

//region INITIALIZATION

 private int myVaribale;  

 private String otherVariblae;

 //endregion

In C#

#region regionName
private int myVaribale;   
private String otherVariblae;
#endregion

Transfer data one fragment to another With Cunstructor

 B.1. Send data from This Fragment (Source Fragment) 

public class testList extends Fragment {

    //Define Event Listener
    private TestFragmentEvent listener; 
    public interface TestFragmentEvent {
        public void TestFragmentEvent_Create();
        public void TestFragmentEvent_View(String data);
    }
    public void onAttach(@NonNull Context context) {
        super.onAttach(context);
        if (context instanceof SecondFragment.onFrgmtSecondBtnSelected) {
            listener = (TestFragmentEvent) context;
        } else {
            throw new ClassCastException(context.toString() + " must implement listener");
        }
    }   

    public void f_showData() {
                        String rdata = "{Id:101,Name:"XYZabc"}";
                        try {
                            rdata = testDataJsonArray.getJSONObject(i).toString();
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                        listener.TestFragmentEvent_View(rdata);
    }
    
}
   

B.2 Main Activity

public class MainActivity extends AppCompatActivity implements testList.TestFragmentEvent {
    @Override
    public void TestFragmentEvent_View(String data) {

        testView testview = new testView(data);         

        fragmentManager = getSupportFragmentManager();
        fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.container_fragment, testview);
        fragmentTransaction.commit();
    }
}

B.3. Get data on Load Fragment (Destination Fragment)

public class testView extends Fragment {

    String rdata;
    public testView(){
    }
    public testView(String data){
        rdata = data;
    }

    TextView tvId, tvName;

    //traverse variable
    public static String MSG = "com.omgrk.OMGRKMngTestAndroid.Test.MSG";

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_test_view, container, false);
        // Coding here
        tvId = view.findViewById(R.id.tv_test_id);
        tvName = view.findViewById(R.id.tv_test_name);

        JSONObject jsonObject;
        String data = rdata;

        try {
            jsonObject = new JSONObject(data);
            //fill data
            tvName.setText(jsonObject.getString("name"));
            tvId.setText(jsonObject.getString("id"));
        } catch (JSONException e) {
            e.printStackTrace();
        }

        // Coding here
        return view;
    }

}

Transfer data one fragment to another two type A. With Bundle, B. With Cunstructor

A.1. Send data from This Fragment (Source Fragment) 

public class testList extends Fragment {

    //Define Event Listener
    private TestFragmentEvent listener; 
    public interface TestFragmentEvent {
        public void TestFragmentEvent_Create();
        public void TestFragmentEvent_View(String data);
    }
    public void onAttach(@NonNull Context context) {
        super.onAttach(context);
        if (context instanceof SecondFragment.onFrgmtSecondBtnSelected) {
            listener = (TestFragmentEvent) context;
        } else {
            throw new ClassCastException(context.toString() + " must implement listener");
        }
    }   

    public void f_showData() {
                        String rdata = "{Id:101,Name:"XYZabc"}";
                        try {
                            rdata = testDataJsonArray.getJSONObject(i).toString();
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                        listener.TestFragmentEvent_View(rdata);
    }
    
}
    

A.2. In Main Activity

public class MainActivity extends AppCompatActivity implements testList.TestFragmentEvent {
    @Override
    public void TestFragmentEvent_View(String data) {

        testView testview = new testView();    
        Bundle bundle = new Bundle();
        bundle.putString("rdata", data);
        testview.setArguments(bundle);        

        fragmentManager = getSupportFragmentManager();
        fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.container_fragment, testview);
        fragmentTransaction.commit();
    }
}

A.3. Get data on Load Fragment (Destination Fragment)

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_test_view, container, false);
        // Coding here
        tvId = view.findViewById(R.id.tv_test_id);
        tvName = view.findViewById(R.id.tv_test_name);


        String data =this.getArguments().getString(MSG);
        Bundle bundle = this.getArguments();
        String data = bundle.getString("rdata");

        JSONObject jsonObject;

        try {
            jsonObject = new JSONObject(data);
            //fill data
            tvName.setText(jsonObject.getString("name"));
            tvId.setText(jsonObject.getString("id"));
        } catch (JSONException e) {
            e.printStackTrace();
        }

        // Coding here
        return view;
    }

B.1. Send data from This Fragment (Source Fragment) 

public class testList extends Fragment {

    //Define Event Listener
    private TestFragmentEvent listener; 
    public interface TestFragmentEvent {
        public void TestFragmentEvent_Create();
        public void TestFragmentEvent_View(String data);
    }
    public void onAttach(@NonNull Context context) {
        super.onAttach(context);
        if (context instanceof SecondFragment.onFrgmtSecondBtnSelected) {
            listener = (TestFragmentEvent) context;
        } else {
            throw new ClassCastException(context.toString() + " must implement listener");
        }
    }   

    public void f_showData() {
                        String rdata = "{Id:101,Name:"XYZabc"}";
                        try {
                            rdata = testDataJsonArray.getJSONObject(i).toString();
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                        listener.TestFragmentEvent_View(rdata);
    }
    
}
   

B.2 Main Activity

public class MainActivity extends AppCompatActivity implements testList.TestFragmentEvent {
    @Override
    public void TestFragmentEvent_View(String data) {

        testView testview = new testView(data);         

        fragmentManager = getSupportFragmentManager();
        fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.container_fragment, testview);
        fragmentTransaction.commit();
    }
}

B.3. Get data on Load Fragment (Destination Fragment)

public class testView extends Fragment {

    String rdata;
    public testView(){
    }
    public testView(String data){
        rdata = data;
    }

    TextView tvId, tvName;

    //traverse variable
    public static String MSG = "com.omgrk.OMGRKMngTestAndroid.Test.MSG";

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_test_view, container, false);
        // Coding here
        tvId = view.findViewById(R.id.tv_test_id);
        tvName = view.findViewById(R.id.tv_test_name);

        JSONObject jsonObject;
        String data = rdata;

        try {
            jsonObject = new JSONObject(data);
            //fill data
            tvName.setText(jsonObject.getString("name"));
            tvId.setText(jsonObject.getString("id"));
        } catch (JSONException e) {
            e.printStackTrace();
        }

        // Coding here
        return view;
    }

}