<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical">



       <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="回調(diào)事件處理演示" />
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
       <Button
         android:id="@+id/button1"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:focusableInTouchMode="true"
         android:text="按鈕1"/>
     <Button
         android:id="@+id/button2"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:focusableInTouchMode="true"
         android:text="按鈕2"/>
     <Button
         android:id="@+id/button3"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:focusableInTouchMode="true"
         android:text="按鈕3"/>
    </LinearLayout>



    </LinearLayout>

    package introduction.android.eventDemo;



    import android.app.Activity;
    import android.content.Context;
    import android.graphics.Rect;
    import android.os.Bundle;
    import android.util.Log;
    import android.view.KeyEvent;
    import android.view.MotionEvent;
    import android.view.View;
    import android.view.View.OnFocusChangeListener;
    import android.widget.Button;
    import android.widget.Toast;



    public class EventDemo extends Activity implements OnFocusChangeListener {
        Button[] buttons=new Button[3];
        @Override
        public void onCreate(Bundle savedInstanceState){
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
            buttons[0]=(Button)findViewById(R.id.button1);
            buttons[1]=(Button)findViewById(R.id.button2);
            buttons[2]=(Button)findViewById(R.id.button3);
            for(Button button :buttons){
                button.setOnFocusChangeListener(this);
            }
        }
        //按鈕按下觸發(fā)的事件
        public boolean onKeyDown(int keyCode,KeyEvent event)
        {
            switch(keyCode)
            {
                case KeyEvent.KEYCODE_DPAD_UP:
                    DisplayInformation("按下上方向鍵，KEYCODE_DPAD_UP");
                    break;
                case KeyEvent.KEYCODE_DPAD_DOWN:
                    DisplayInformation("按下下方向鍵，KEYCODE_DPAD_UP");
                    break;
            }
            return false;
        }
        //按鈕彈起觸發(fā)的事件
        public boolean onKeyUp(int keyCode,KeyEvent event)
        {
            switch(keyCode)
            {
                case KeyEvent.KEYCODE_DPAD_UP:
                    DisplayInformation("松開上方向鍵，KEYCODE_DPAD_UP");
                    break;
                case KeyEvent.KEYCODE_DPAD_DOWN:
                    DisplayInformation("松開下方向鍵，KEYCODE_DPAD_UP");
                    break;
            }
            return false;



        }



        //觸摸事件
        public boolean onTouchEvent(MotionEvent event)
        {
            switch(event.getAction()){
      case MotionEvent.ACTION_DOWN:
        DisplayInformation("手指正在往屏幕上按下");
        break;
      case MotionEvent.ACTION_MOVE:
        DisplayInformation("手指正在屏幕上移動(dòng)");
        break;
      case MotionEvent.ACTION_UP:
        DisplayInformation("手指正在從屏幕上抬起");
        break;
      }
          return false;
        }



        //焦點(diǎn)事件
        @Override
        public void onFocusChange(View view, boolean arg1){
      switch(view.getId()){
      case R.id.button1:
        DisplayInformation("第一個(gè)按鈕獲得了焦點(diǎn)");
        break;
      case R.id.button2:
        DisplayInformation("第二個(gè)按鈕獲得了焦點(diǎn)");
        break;
      case R.id.button3:
        DisplayInformation("第三個(gè)按鈕獲得了焦點(diǎn)");
        break;
      }
        }



        //顯示Toast
        public void DisplayInformation(String string)
        {
            //Toast.makeText(EventDemo.this,string,Toast.LENGTH_SHORT).show();
        Log.i("enentDemo",string);
        }
    }