自己监听Home键

对Activity而言：

   @Override    public void onAttachedToWindow() {        // TODO Auto-generated method stub        this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);        super.onAttachedToWindow();    }

    public boolean onKeyDown(int keyCode, KeyEvent event) {        if (KeyEvent.KEYCODE_BACK == keyCode) {            if (lThread != null) {                flag = false;                lThread = null;            }            if (tThread != null) {                flag = false;                tThread = null;            }            Log.d(TAG, "BACK--------delete the file update.zip---------");            mFileUtils.delete(flash_path, FileUtils.FW_NAME);            android.os.Process.killProcess(android.os.Process.myPid());        }        if (KeyEvent.KEYCODE_HOME == keyCode) {            if (lThread != null) {                flag = false;                lThread = null;            }            if (tThread != null) {                flag = false;                tThread = null;            }            Log.d(TAG, "HOME--------delete the file update.zip---------");            mFileUtils.delete(flash_path, FileUtils.FW_NAME);            Intent i = new Intent();            i.setClassName("net.flync.pc2.tv", "net.flync.pc2.tv.activity.HomeActivity");            startActivity(i);            this.finish();        }        return super.onKeyDown(keyCode, event);    }

 mypDialog.show();                    // ignore home                     mypDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);