Android 障蔽HOME键

package shoujizhengren.co.cc;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.WindowManager;
import android.widget.Toast;

public class Suiping extends Activity {
 @Override
 protected void onCreate(
   Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);

 }

 @Override
 public boolean onKeyDown(
   int keyCode, KeyEvent event) {
  // TODO Auto-generated method stub

  if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {

   Intent i = new Intent(
     Intent.ACTION_MAIN);

   i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

   i.addCategory(Intent.CATEGORY_HOME);

   startActivity(i);

   return true;
  }

  if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {

   Toast.makeText(
     Suiping.this,
     "弹出对话框", 1000)
     .show();
   Intent intent = new Intent(
     Suiping.this,
     ShoujizhengrenActivity.class);

   startActivity(intent);
   finish();

   return true;
  }

  else {
   return super.onKeyDown(
     keyCode, event);

  }

 }

 @Override
 public void onBackPressed() {
  // TODO Auto-generated method stub

 }

//屏蔽HOME键

 public void onAttachedToWindow() {
  this.getWindow()
    .setType(
      WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
  super.onAttachedToWindow();
 }

}

-------------------androidmanifest.xml

<uses-permission android:name="android.permission.DISABLE_KEYGUARD" />