package com.lingdududu.test; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.view.KeyEvent; 
import android.view.WindowManager; 
import android.widget.Toast; 
 
public class MainActivity extends Activity { 
 /** Called when the activity is first created. */ 
 private boolean catchHomeKey = false; 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.main); 
 } 
  
 @Override 
 public void onAttachedToWindow() { 
  // TODO Auto-generated method stub 
  if (!catchHomeKey) { 
   this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD); 
  } 
  super.onAttachedToWindow(); 
 } 
 
 @Override 
 public boolean onKeyDown(int keyCode, KeyEvent event) { 
  // TODO Auto-generated method stub 
  if (keyCode == KeyEvent.KEYCODE_HOME) { 
   Toast.makeText(MainActivity.this, \"你点击了HOME键\", Toast.LENGTH_LONG).show(); 
  } 
  return super.onKeyDown(keyCode, event); 
 } 
}