Android Example: To Do List

AndroidManifest.xml Codes:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.todo_list"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <uses-configuration
        android:reqTouchScreen="finger"
        android:reqNavigation="dpad"
        android:reqHardKeyboard="true"
        android:reqKeyboardType="qwerty"
    />
   
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.todo_list.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

/res/layout/activity_main.xml Codes:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

   <LinearLayout
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        tools:ignore="UselessParent" >

        <EditText
            android:id="@+id/myEditText"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="New To Do Item"
            tools:ignore="TextFields,HardcodedText"
        />
               
        <ListView
            android:id="@+id/myListView"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
        />

    </LinearLayout>

</RelativeLayout>

/src/com.example.trial_1/MainActivity.java Codes:

package com.example.todo_list;
import java.util.ArrayList;
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 myListView=(ListView)findViewById(R.id.myListView);
final EditText myEditText=(EditText)findViewById(R.id.myEditText);
final ArrayList<String> todoItems=new ArrayList<String>();
final ArrayAdapter<String> aa;
aa=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,todoItems);
myListView.setAdapter(aa);

myEditText.setOnKeyListener(new View.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());
aa.notifyDataSetChanged();
myEditText.setText("");
return true;
}
return false;
}
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;
}
}