To do list app : ListActivity « UI « Android

1. Android
2. UI
3. ListActivity

To do list app

   

package app.test;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.ContextMenu;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnKeyListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;

class TodoListItemView extends TextView {

  private Paint marginPaint;
  private Paint linePaint;
  private int paperColor;
  private float margin;

  public TodoListItemView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init();
  }

  public TodoListItemView(Context context) {
    super(context);
    init();
  }

  public TodoListItemView(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
  }

  private void init() {
    marginPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    marginPaint.setColor(Color.RED);
    linePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    linePaint.setColor(Color.BLUE);
    paperColor = Color.YELLOW;
    margin = Color.CYAN;
  }

  @Override
  public void onDraw(Canvas canvas) {
    canvas.drawColor(paperColor);
    canvas.drawLine(0, 0, getMeasuredHeight(), 0, linePaint);
    canvas.drawLine(0, getMeasuredHeight(), getMeasuredWidth(),
        getMeasuredHeight(), linePaint);
    canvas.drawLine(margin, 0, margin, getMeasuredHeight(), marginPaint);
    canvas.save();
    canvas.translate(margin, 0);
    super.onDraw(canvas);
    canvas.restore();
  }
}

public class Test extends Activity {
  private ArrayList<String> todoItems;
  private ListView myListView;
  private EditText myEditText;
  private ArrayAdapter<String> aa;
  private boolean addingNew = false;
  final int ADD_NEW_TODO = Menu.FIRST;
  final int REMOVE_TODO = Menu.FIRST + 1;

  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.main);
    myListView = (ListView) findViewById(R.id.myListView);
    myEditText = (EditText) findViewById(R.id.myEditText);
    todoItems = new ArrayList<String>();
    aa = new ArrayAdapter<String>(getApplicationContext(), R.layout.row,
        todoItems);
    myListView.setAdapter(aa);
    myEditText.setOnKeyListener(new OnKeyListener() {
      public boolean onKey(View v, int keyCode, KeyEvent event) {
        if (event.getAction() == KeyEvent.ACTION_DOWN)
          if (keyCode == KeyEvent.KEYCODE_DPAD_CENTER) {
            todoItems.add(0, myEditText.getText().toString());
            myEditText.setText("");
            aa.notifyDataSetChanged();
            cancelAdd();
            return true;
          }
        return false;
      }
    });

    registerForContextMenu(myListView);
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    super.onCreateOptionsMenu(menu);
    MenuItem itemAdd = menu.add(0, ADD_NEW_TODO, Menu.NONE, "add_new");
    MenuItem itemRem = menu.add(0, REMOVE_TODO, Menu.NONE, "remove");
    itemAdd.setIcon(R.drawable.icon);
    itemRem.setIcon(R.drawable.icon);
    itemAdd.setShortcut('0', 'a');
    itemRem.setShortcut('1', 'r');
    return true;
  }

  @Override
  public void onCreateContextMenu(ContextMenu menu, View v,
      ContextMenu.ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);
    menu.setHeaderTitle("Selected To Do Item");
    menu.add(0, REMOVE_TODO, Menu.NONE, "remove");
  }

  @Override
  public boolean onPrepareOptionsMenu(Menu menu) {
    super.onPrepareOptionsMenu(menu);

    int idx = myListView.getSelectedItemPosition();
    MenuItem removeItem = menu.findItem(REMOVE_TODO);
    removeItem.setTitle("remove");
    removeItem.setVisible(addingNew || idx > -1);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    super.onOptionsItemSelected(item);

    int index = myListView.getSelectedItemPosition();

    switch (item.getItemId()) {
    case (REMOVE_TODO): {
      if (addingNew) {
        cancelAdd();
      } else {
        removeItem(index);
      }
      return true;
    }
    case (ADD_NEW_TODO): {
      addNewItem();
      return true;
    }
    }

    return false;
  }

  @Override
  public boolean onContextItemSelected(MenuItem item) {
    super.onContextItemSelected(item);
    switch (item.getItemId()) {
    case (REMOVE_TODO): {
      AdapterView.AdapterContextMenuInfo menuInfo = (AdapterView.AdapterContextMenuInfo) item
          .getMenuInfo();
      int index = menuInfo.position;
      removeItem(index);
      return true;
    }
    }
    return false;
  }

  private void cancelAdd() {
    addingNew = false;
    myEditText.setVisibility(View.GONE);
  }

  private void addNewItem() {
    addingNew = true;
    myEditText.setVisibility(View.VISIBLE);
    myEditText.requestFocus();
  }

  private void removeItem(int _index) {
    todoItems.remove(_index);
    aa.notifyDataSetChanged();
  }
}

//main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
  >
  <EditText
    android:id="@+id/myEditText"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text=""
    android:visibility="gone"
  />
  <ListView  
    android:id="@+id/myListView"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
  />
</LinearLayout>

//row.xml
<?xml version="1.0" encoding="utf-8"?>
<app.test.TodoListItemView 
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:padding="10dp"
  android:scrollbars="vertical"
  android:fadingEdge="vertical"
/> 

   
    
    
  

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