Kotlin Basics

Install in Studio

Go to File --> Settings -->Pluins-->install jet brains plugin-->select kotlin -->Download and install

Restart IDE

Sample Project
--------------------
Create new project
Open MainActivity and then type ctrl+Alt+shft+k
File gets converted to kotlin file

Access UI components in Kotlin file
---------------------------------------------------
Add this import in MainActivity.java "import kotlinx.android.synthetic.main.activity_main.textView;"

Access directly in oncreate as follows

textView.setText("This is kotlin example")

Done build and run:)

Android TableLayout Dynamic Creation and filling cells

package com.example.namratha.tableview;

import android.graphics.Color;
import android.graphics.drawable.GradientDrawable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.widget.HorizontalScrollView;
import android.widget.ScrollView;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    int startTime , endTime;
    int columnName;
    @Override    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);
        String[] row = {"9", "10", "11", "12", "13", "14",
                "15" ,"16" , "17" , "18", "19" ,"20","21","22","23","24"};
        String[] column = {"COLUMN1", "COLUMN2", "COLUMN3", "COLUMN4",
                "COLUMN5", "COLUMN6" , "COLUMN7" , "COLUMN8" ,"COLUMN9" , "COLUMN10" , "COLUMN11"};
        int rl = row.length;
        int cl = column.length;
        ScrollView sv = new ScrollView(this);
        TableLayout tableLayout = createTableLayout(row, column, rl, cl);

        HorizontalScrollView hsv = new HorizontalScrollView(this);

        hsv.addView(tableLayout);
        sv.addView(hsv);
        setContentView(sv);


        //Meeting time for colun 3 is from 9 to 11        /*startTime = 9;        endTime = 11;        int rowId = findRowID(startTime ,endTime);*/        //meeing time is at 12 for column 3;        int rowIndex = findRowID(15);
        makeCellEmpty(tableLayout , rowIndex , 3);
        //meeting time is 9 to 11        startTime = 9;
        endTime =11;
         columnName =3;
        calculateTimeDiff(tableLayout, columnName );

        startTime = 12;
        endTime =18;
        columnName = 5;
        calculateTimeDiff(tableLayout,columnName);

    }

    private void calculateTimeDiff(TableLayout tableLayout, int name) {
        for(int i = startTime;i<=endTime;i++)
        {
            int rowIndexSample = findRowID(i);
            makeCellEmpty(tableLayout, rowIndexSample,name);

        }
    }


    private int findRowID(int startTime)
    {
        int rowId = 0;
        if(startTime == 9)
            rowId = 1;
        else if(startTime == 10)
            rowId =2;
        else if(startTime == 11)
            rowId =3;
        else if(startTime == 12)
            rowId =4;
        else if(startTime == 13)
            rowId =5;
        else if(startTime == 14)
            rowId =6;
        else if(startTime == 15)
            rowId =7;
        else if(startTime == 16)
            rowId =8;
        else if(startTime == 17)
            rowId =9;
        else if(startTime == 18)
            rowId =10;
        else if(startTime == 19)
            rowId =11;
        else if(startTime == 20)
            rowId =12;
        else if(startTime == 21)
            rowId =13;
        else if(startTime == 22)
            rowId =14;
        else if(startTime == 23)
            rowId =15;
        else if(startTime == 24)
            rowId =16;

        return rowId;

    }


    public void makeCellEmpty(TableLayout tableLayout, int rowIndex, int columnIndex) {
        // get row from table with rowIndex        TableRow tableRow = (TableRow) tableLayout.getChildAt(rowIndex);
/*        tableRow.setLayoutParams(new TableLayout.LayoutParams(                TableLayout.LayoutParams.FILL_PARENT,                TableLayout.LayoutParams.FILL_PARENT, 1.0f));*/        // get cell from row with columnIndex        TextView textView = (TextView) tableRow.getChildAt(columnIndex);

        // make it black        textView.setBackgroundColor(Color.BLACK);

    }

    public void setHeaderTitle(TableLayout tableLayout, int rowIndex, int columnIndex) {

        // get row from table with rowIndex        TableRow tableRow = (TableRow) tableLayout.getChildAt(rowIndex);

        // get cell from row with columnIndex
        TextView textView = (TextView) tableRow.getChildAt(columnIndex);

        textView.setText("Hello");
    }


    private TableLayout createTableLayout(String[] rv, String[] cv, int rowCount, int columnCount) {
        // 1) Create a tableLayout and its params        TableLayout.LayoutParams tableLayoutParams = new TableLayout.LayoutParams();
        TableLayout tableLayout = new TableLayout(this);
        tableLayout.setBackgroundColor(Color.BLACK);


        // 2) create tableRow params        TableRow.LayoutParams tableRowParams = new TableRow.LayoutParams();
        tableRowParams.setMargins(1, 1, 1, 1);
        tableRowParams.weight = 1;


        int leftMargin=10;
        int topMargin=50;
        int rightMargin=10;
        int bottomMargin=50;
      //  tableRowParams.setMargins(leftMargin, topMargin, rightMargin, bottomMargin);


        for (int i = 0; i < rowCount; i++) {
            // 3) create tableRow            TableRow tableRow = new TableRow(this);
            tableRow.setBackgroundColor(Color.GRAY);
            //tableRow.setBackground(getResources().getDrawable(R.drawable.border));           /* tableRow.setLayoutParams(new TableLayout.LayoutParams(                    TableLayout.LayoutParams.FILL_PARENT,                    TableLayout.LayoutParams.FILL_PARENT, 1.0f));*/
            for (int j = 0; j < columnCount; j++) {
                // 4) create textView                TextView textView = new TextView(this);
                //  textView.setText(String.valueOf(j));                textView.setBackgroundColor(Color.WHITE);
                textView.setGravity(Gravity.CENTER);
                textView.setWidth(200);
                textView.setHeight(300);

                String s1 = Integer.toString(i);
                String s2 = Integer.toString(j);
                String s3 = s1 + s2;
                int id = Integer.parseInt(s3);
                Log.d("TAG", "-___>" + id);
                if (i == 0 && j == 0) {
                    textView.setText("0==0");
                } else if (i == 0) {
                    Log.d("TAAG", "set Column Headers");
                    textView.setText(cv[j - 1]);
                } else if (j == 0) {
                    Log.d("TAAG", "Set Row Headers");
                    textView.setText(rv[i - 1]);
                } else {
//                    textView.setText("" + id);                    // check id=23                    if (id == 23) {
  //                      textView.setText("ID=23");
                    }
                }

                // 5) add textView to tableRow                tableRow.addView(textView, tableRowParams);
            }

            // 6) add tableRow to tableLayout            tableLayout.addView(tableRow, tableLayoutParams);
        }

        return tableLayout;
    }
}