Mit Double Werten rechnen

package com.example.wildkalkulation2;


...


public class MainActivity extends AppCompatActivity {


    /**
     * The {@link android.support.v4.view.PagerAdapter} that will provide
     * fragments for each of the sections. We use a
     * {@link FragmentPagerAdapter} derivative, which will keep every
     * loaded fragment in memory. If this becomes too memory intensive, it
     * may be best to switch to a
     * {@link android.support.v4.app.FragmentStatePagerAdapter}.
     */
    private SectionsPagerAdapter mSectionsPagerAdapter;


    /**
     * The {@link ViewPager} that will host the section contents.
     */
    private ViewPager mViewPager;














    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);




        final EditText firstNumber;
        final EditText secondNumber;
        final TextView addResult;
        Button btnAdd;


        final double[] num1 = new double[1];
        final double[] num2 = new double[1];
        final double[] sum = new double[1];




        firstNumber = (EditText)findViewById(R.id.zahl1gew);
        secondNumber = (EditText)findViewById(R.id.zahl1kgpreis);
        addResult = (TextView)findViewById(R.id.zahl1preis);


 
        TextWatcher generalTextWatcher = new TextWatcher() {


            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
            }
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }
            @Override
            public void afterTextChanged(Editable s) {
                try {


                num1[0] = Double.parseDouble(firstNumber.getText().toString());
                num2[0] = Double.parseDouble(secondNumber.getText().toString());
                sum[0] = num1[0] * num2[0];
                addResult.setText(Double.toString(sum[0]));
                } catch (NumberFormatException ex) {
                    // Fehlerbehandlung (Ausgabe an den User per Popup)
                    System.out.println("num1[0] ist" +num1[0]);
                    System.out.println("num2[0] ist" +num2[0]);


                }
            }


        };


        firstNumber.addTextChangedListener(generalTextWatcher);
        secondNumber.addTextChangedListener(generalTextWatcher);










        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        // Create the adapter that will return a fragment for each of the three
        // primary sections of the activity.
        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());


        // Set up the ViewPager with the sections adapter.
        mViewPager = (ViewPager) findViewById(R.id.container);
        mViewPager.setAdapter(mSectionsPagerAdapter);


        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });








    }




    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();


        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }


        return super.onOptionsItemSelected(item);
    }


    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {
        /**
         * The fragment argument representing the section number for this
         * fragment.
         */
        private static final String ARG_SECTION_NUMBER = "section_number";


        public PlaceholderFragment() {
        }


        /**
         * Returns a new instance of this fragment for the given section
         * number.
         */
        public static PlaceholderFragment newInstance(int sectionNumber) {
            PlaceholderFragment fragment = new PlaceholderFragment();
            Bundle args = new Bundle();
            args.putInt(ARG_SECTION_NUMBER, sectionNumber);
            fragment.setArguments(args);
            return fragment;
        }


        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container, false);
            TextView textView = (TextView) rootView.findViewById(R.id.section_label);
            textView.setText(getString(R.string.section_format, getArguments().getInt(ARG_SECTION_NUMBER)));
            return rootView;
        }
    }


    /**
     * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
     * one of the sections/tabs/pages.
     */
    public class SectionsPagerAdapter extends FragmentPagerAdapter {


        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }


        @Override
        public Fragment getItem(int position) {
            // getItem is called to instantiate the fragment for the given page.
            // Return a PlaceholderFragment (defined as a static inner class below).
            return PlaceholderFragment.newInstance(position + 1);
        }


        @Override
        public int getCount() {
            // Show 3 total pages.
            return 3;
        }
    }








}

private Context context = null;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        setTitle("dev2qa.com - Android Table Layout Example.");


        // Get TableLayout object in layout xml.
        final TableLayout tableLayout = (TableLayout)findViewById(R.id.row1);


        context = getApplicationContext();


        // Get add table row button.
        Button addRowButton = (Button)findViewById(R.id.addrowbutton);
        addRowButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Create a new table row.
                TableRow tableRow = new TableRow(context);


                // Set new table row layout parameters.
                TableRow.LayoutParams layoutParams = new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT);
                tableRow.setLayoutParams(layoutParams);


                // Add a TextView in the first column.
                TextView textView = new TextView(context);
                textView.setText("This is the ");
                tableRow.addView(textView, 0);


                // Add a button in the second column
                Button button = new Button(context);
                button.setText("New Row");
                tableRow.addView(button, 1);


                // Add a checkbox in the third column.
                CheckBox checkBox = new CheckBox(context);
                checkBox.setText("Check it");
                tableRow.addView(checkBox, 2);


                tableLayout.addView(tableRow);
            }
        });




        // Get delete table row button.
        Button deleteRowButton = (Button)findViewById(R.id.delrowbutton);
        deleteRowButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Get table row count.
                int rowCount = tableLayout.getChildCount();


                // Save delete row number list.
                List<Integer> deleteRowNumberList = new ArrayList<Integer>();


                // Loope each table rows.
                for(int i =0 ;i < rowCount;i++)
                {
                    // Get table row.
                    View rowView = tableLayout.getChildAt(i);


                    if(rowView instanceof TableRow)
                    {
                        TableRow tableRow = (TableRow)rowView;


                        // Get row column count.
                        int columnCount = tableRow.getChildCount();


                        // Loop all columns in row.
                        for(int j = 0;j<columnCount;j++)
                        {
                            View columnView = tableRow.getChildAt(j);
                            if(columnView instanceof CheckBox)
                            {
                                // If columns is a checkbox and checked then save the row number in list.
                                CheckBox checkboxView = (CheckBox)columnView;
                                if(checkboxView.isChecked())
                                {
                                    deleteRowNumberList.add(i);
                                    break;
                                }
                            }
                        }
                    }
                }


                // Remove all rows by the selected row number.
                for(int rowNumber :deleteRowNumberList)
                {
                    tableLayout.removeViewAt(rowNumber);
                }
            }
        });

// Get delete table row button.
        Button deleteRowButton = (Button) findViewById(R.id.delrowbutton);
        deleteRowButton.setOnClickListener(new View.OnClickListener() {


            @Override
            public void onClick(View v) {


                // Get table row count.
                int rowCount = tableLayout.getChildCount();
                // Save delete row number list.
                List<Integer> deleteRowNumberList = new ArrayList<Integer>();


                // Loope each table rows.
                for (int i = 0; i < rowCount; i++) {
                    // Get table row.
                    View rowView = tableLayout.getChildAt(i);


                    if (rowView instanceof TableRow) {
                        TableRow tableRow = (TableRow)rowView;


                        // Get row column count.
                        int columnCount = tableRow.getChildCount();
                        // Loop all columns in row.
                        for (int j = 0; j < columnCount; j++) {
                            View columnView = tableRow.getChildAt(j);
                            if (columnView instanceof CheckBox) {
                                // If columns is a checkbox and checked then save the row number in list.
                                CheckBox checkboxView = (CheckBox) columnView;
                                if (checkboxView.isChecked()) {
                                    deleteRowNumberList.add(i);
                                    break;
                                }






                            }
                        }
                    }
                }


                // Remove all rows by the selected row number.
                for (int rowNumber :deleteRowNumberList) {
                    tableLayout.removeViewAt(rowNumber);


                }
            }
        });

addRowButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


                // Create a new table row.
                TableRow tableRow = new TableRow(context);


                // Set new table row layout parameters.
                TableRow.LayoutParams layoutParams = new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT);
                tableRow.setLayoutParams(layoutParams);


                // Add a TextView in the first column.
                EditText editText1 = new EditText(context);
                editText1.setText("Stück");
                tableRow.addView(editText1, 0);


                final EditText firstNumber2 = new EditText(context);
                firstNumber2.setText("1");
                final double[] num1 = new double[1];
                //firstNumber2 = (EditText)findViewById(R.id.zahl1gew);
                tableRow.addView(firstNumber2, 1);


                final double[] sum = new double[1];
                final String[] sumstring = new String[1];


                final EditText secondNumber2 = new EditText(context);
                secondNumber2.setText("1");
                final double[] num2 = new double[1];
                tableRow.addView(secondNumber2, 2);




                final TextView addResult2 = new TextView(context);
                addResult2.setText("2");
                //final double[] num3 = new double[1];
                tableRow.addView(addResult2, 3);


                Button button = new Button(context);
                button.setText("verkauft");
                tableRow.addView(button, 4);


                //final TextView addResult;
                //addResult = (TextView)findViewById(R.id.zahl1preis);