Simple Todo List Application in Android with Source Code

 
package com.example.to_do_list;
 
import java.util.ArrayList;
 
import android.R.string;
import android.os.Bundle;
import android.app.Activity;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
 
public class MainActivity extends Activity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        ListView lv = (ListView) findViewById(R.id.ListView);
        final EditText text = (EditText) findViewById(R.id.edittext);
 
        final ArrayList<String> do_list = new ArrayList<String>();
        final ArrayAdapter<String> adapter;
 
        adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, do_list);
 
        lv.setAdapter(adapter);
 
        text.setOnKeyListener(new View.OnKeyListener() {
 
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                // TODO Auto-generated method stub
                if (event.getAction() == KeyEvent.ACTION_DOWN) {
                    if ((keyCode == KeyEvent.KEYCODE_DPAD_CENTER)
                            || (keyCode == KeyEvent.KEYCODE_ENTER)) {
                        do_list.add(0, text.getText().toString());
                        adapter.notifyDataSetChanged();
                        text.setText("");
                        return true;
                    }
                }
                return false;
            }
        });
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
}

 
package com.example.to_do_list;
 
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.TextView;
 
public class dolistitemview extends TextView {
 
    private Paint marginPaint;
    private Paint linePaint;
    private int paperColor;
    private float margin;
 
    public dolistitemview(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        // TODO Auto-generated constructor stub
        init();
    }
 
    private void init() {
 
        Resources myResources = getResources();
 
        marginPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        marginPaint.setColor(myResources.getColor(R.color.notepad_margin));
        linePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        linePaint.setColor(myResources.getColor(R.color.notepad_lines));
        paperColor = myResources.getColor(R.color.notepad_paper);
        margin = myResources.getDimension(R.dimen.notepad_margin);
    }
 
    @Override
    public void onDraw(Canvas canvas) {
        // Use the base TextView to render the text.
        canvas.drawColor(paperColor);
 
        //drawing lines
        canvas.drawLine(0, 0, 0, getMeasuredHeight(), linePaint);
        canvas.drawLine(0, getMeasuredHeight(), getMeasuredWidth(),
                getMeasuredHeight(), linePaint);
        //the margin line
        canvas.drawLine(margin, 0, margin, getMeasuredHeight(), marginPaint);
 
        canvas.save();
        canvas.translate(margin, 0);
        super.onDraw(canvas);
        canvas.restore();
    }
}