Question

I am relatively new to the android game and I am having an issue with my app crashing whenever I call a function from a second java class.

this is my main JAVA file:

    package mashuda.tools.calculator;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Typeface;
import android.os.Bundle;
import android.util.TypedValue;
import android.view.Gravity;
import android.widget.Button;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;

public class CalculatorActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        Drawinterface layout = new Drawinterface();


        setContentView(layout.drawit());


    }

}

and it is calling this code:

 package mashuda.tools.calculator;

import android.app.Activity;
import android.graphics.Typeface;
import android.os.Bundle;
import android.util.TypedValue;
import android.view.Gravity;
import android.widget.Button;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;

public class Drawinterface extends Activity { 
    /** Called when the activity is first created. 
     * @return */


        TableLayout drawit(){

            TableLayout maintable = new TableLayout(this);

            maintable.setStretchAllColumns(true);
            maintable.setShrinkAllColumns(true);

            TableRow banner = new TableRow(this);
            banner.setGravity(Gravity.CENTER_HORIZONTAL);

            TableRow rowOutput = new TableRow(this);
            TableRow rowSeven = new TableRow(this);
            TableRow rowFour = new TableRow(this);
            TableRow rowOne = new TableRow(this);
            TableRow rowZero = new TableRow(this);


            //answer box
            TextView answer = new TextView(this);
            answer.setText("ANSWER");

            answer.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 18);

            answer.setBackgroundColor(-1);

            answer.setGravity(Gravity.RIGHT);
            answer.setTypeface(Typeface.SERIF);

            TableRow.LayoutParams params = new TableRow.LayoutParams();
            params.span = 5;

            //loads answer bar
            rowOutput.addView(answer, params);
            //first column
            //creates 7 key
            Button sevenkey = new Button(this);
            sevenkey.setText("7");
            sevenkey.setTypeface(Typeface.DEFAULT_BOLD);

            // creates 8 key
            Button eightkey = new Button(this);
            eightkey.setText("8");
            eightkey.setTypeface(Typeface.DEFAULT_BOLD);

            // creates 9 key
            Button ninekey = new Button(this);
            ninekey.setText("9");
            ninekey.setTypeface(Typeface.DEFAULT_BOLD);

            // creates division key
            Button dividekey = new Button(this);
            dividekey.setText("/");
            dividekey.setTypeface(Typeface.DEFAULT_BOLD);

            // loads top row
            rowSeven.addView(sevenkey);
            rowSeven.addView(eightkey);
            rowSeven.addView(ninekey);
            rowSeven.addView(dividekey);

            //creates 4 key
            Button fourkey = new Button(this);
            fourkey.setText("4");
            fourkey.setTypeface(Typeface.DEFAULT_BOLD);

            // creates 5 key
            Button fivekey = new Button(this);
            fivekey.setText("5");
            fivekey.setTypeface(Typeface.DEFAULT_BOLD);

            // creates 6 key
            Button sixkey = new Button(this);
            sixkey.setText("6");
            sixkey.setTypeface(Typeface.DEFAULT_BOLD);

            // creates multiplication key
            Button multiplykey = new Button(this);
            multiplykey.setText("X");
            multiplykey.setTypeface(Typeface.DEFAULT_BOLD);

            // loads keys into second row
            rowFour.addView(fourkey);
            rowFour.addView(fivekey);
            rowFour.addView(sixkey);
            rowFour.addView(multiplykey);


            //creates 1 key
            Button onekey = new Button(this);
            onekey.setText("1");
            onekey.setTypeface(Typeface.DEFAULT_BOLD);

            // creates 2 key
            Button twokey = new Button(this);
            twokey.setText("2");
            twokey.setTypeface(Typeface.DEFAULT_BOLD);

            // creates 3 key
            Button threekey = new Button(this);
            threekey.setText("3");
            threekey.setTypeface(Typeface.DEFAULT_BOLD);

            // creates add key
            Button addkey = new Button(this);
            addkey.setText("+");
            addkey.setTypeface(Typeface.DEFAULT_BOLD);

            // loads keys into third row
            rowOne.addView(onekey);
            rowOne.addView(twokey);
            rowOne.addView(threekey);
            rowOne.addView(addkey);

            //creates 0 key
            Button zerokey = new Button(this);
            zerokey.setText("0");
            zerokey.setTypeface(Typeface.DEFAULT_BOLD);

            // creates . key
            Button decimalkey = new Button(this);
            decimalkey.setText(".");
            decimalkey.setTypeface(Typeface.DEFAULT_BOLD);

            // creates - key
            Button negativekey = new Button(this);
            negativekey.setText("+/-");
            negativekey.setTypeface(Typeface.DEFAULT_BOLD);

            // creates equals key
            Button equalskey = new Button(this);
            equalskey.setText("=");
            equalskey.setTypeface(Typeface.DEFAULT_BOLD);

            // loads keys into fourth row
            rowZero.addView(zerokey);
            rowZero.addView(decimalkey);
            rowZero.addView(negativekey);
            rowZero.addView(equalskey);

            // loads rows into table
            maintable.addView(rowOutput); 
            maintable.addView(rowSeven); 
            maintable.addView(rowFour);
            maintable.addView(rowOne);
            maintable.addView(rowZero); 

            //sets view as maintable
            return (maintable);

}
}

I did add the second file to the android manifest.
and my compiler(eclipse) does not detect any errors.
Any help would be greatly appreciated

Answer 1

Instead of creating your TableLayout programatically use an xml resource file.

Here is a tutorial on this: http://huuah.com/using-tablelayout-on-android/