Key event listener : Key « User Event « Android

1. Android
2. User Event
3. Key

Key event listener

    
package app.test;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;

public class Test extends Activity {

  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.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 = new ArrayAdapter<String>(this,
        android.R.layout.simple_list_item_1, 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();
            return true;
          }
        return false;
      }
    });
  }
}

//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="New To Do Item"
  />
  <ListView  
    android:id="@+id/myListView"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
  />
</LinearLayout>

   
    
    
    
  

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