隐藏输入法并退出当前的Activity

在当前的Activity弹出输入法框的时候，按下返回键，输入框消失，而不会退出当前的Activity，在有些时候，我们可能需要退出当前的Activity，可以重写dispatchKeyEventPreIme()方法来做到这一点：

@Override
public boolean dispatchKeyEventPreIme(KeyEvent event) {
	Activity a = getActivity();
	if (null != a && event.getKeyCode() == KeyEvent.KEYCODE_BACK) {
		if (event.getAction() == KeyEvent.ACTION_DOWN && event.getRepeatCount() == 0) {
			return super.dispatchKeyEventPreIme(event);
		} else if (event.getAction() == KeyEvent.ACTION_UP) {
			hideInputMethod();
			a.finish();
			return true;
		}
	}
	return super.dispatchKeyEventPreIme(event);
}

隐藏输入法：

protected void hideInputMethod() {
	InputMethodManager imm = (InputMethodManager)getContext()
		.getSystemService(Context.INPUT_METHOD_SERVICE);
	if (null != imm) {
		imm.hideStatusIcon(getWindowToken());
	}
}

获取到Activity"

private Activity getActivity() {
	Context c = getContext();
	if (c != null && c instanceof Activity) {
		return (Activity)c;
	}
	return null;
}