android 返回值 實現 home鍵的效果

普通的Activity:

public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK) {
			Intent intent = new Intent(Intent.ACTION_MAIN);
			intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
			intent.addCategory(Intent.CATEGORY_HOME);
			startActivity(intent);
			return true;
		} else
			return super.onKeyDown(keyCode, event);
	}

主界面爲TabActivity:

public boolean dispatchKeyEvent(KeyEvent event) {
		if (event.getAction() == KeyEvent.ACTION_DOWN
				&& event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
			Intent setIntent = new Intent(Intent.ACTION_MAIN);
			setIntent.addCategory(Intent.CATEGORY_HOME);
			setIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
			startActivity(setIntent);
		}
		return super.dispatchKeyEvent(event);
	}