[英]How to get ImageView ID from inflater in Android
我正在使用充气机显示由我制作的弹出设置菜单。 它由一些图像和按钮组成。 完成XML布局后,我开始对其进行编码,并使用以下代码正确打开它:
public void Settings_button(View view)
{
if (p != null)
showPopup(Main_activity.this, p);
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
int[] location = new int[2];
ImageButton setting_button = (ImageButton) findViewById(R.id.settings_button);
// Get the x, y location and store it in the location[] array
// location[0] = x, location[1] = y.
setting_button.getLocationOnScreen(location);
//Initialize the Point with x, and y positions
p = new Point();
p.x = location[0];
p.y = location[1];
}
// The method that displays the popup.
private void showPopup(final Activity context, Point p) {
Resources r = getResources();
int popupWidth = 500;
int popupHeight = 300;
// Inflate the popup_layout.xml
LinearLayout viewGroup = (LinearLayout) context.findViewById(R.id.popup);
LayoutInflater layoutInflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View layout = layoutInflater.inflate(R.layout.settings_popup_layout, viewGroup);
// Creating the PopupWindow
final PopupWindow popup = new PopupWindow(context);
popup.setContentView(layout);
popup.setWidth(popupWidth);
popup.setHeight(popupHeight);
popup.setFocusable(true);
// Some offset to align the popup a bit to the right, and a bit down, relative to button's position.
int OFFSET_X = 150;
int OFFSET_Y = 30;
// Displaying the popup at the specified location, + offsets.
popup.showAtLocation(layout, Gravity.NO_GRAVITY, p.x + OFFSET_X, p.y + OFFSET_Y);
}
但是现在我需要获取ImageViews ID和Buttons ID,我已经使用了:
//In onCreate of Main_Activity
ImageView popup_setting_1_icon;
popup_setting_1_icon = (ImageView) findViewById(R.id.setting_1_icon);
Button popup_setting_1_button;
popup_setting_1_button = (Button) findViewById(R.id.setting_1_button);
但是当我开始使用该视图时,例如popup_setting_1_icon.setImageResource(R.id.setting_done_icon);
我使用NullPointerException
导致应用程序崩溃。 我读过一些东西,例如我应该从充气机获取指针,但是我尝试在showPopup
方法中这样做,但是什么也没有。 我该如何解决这个问题?
用show popup方法初始化视图:
ImageView popup_setting_1_icon;
popup_setting_1_icon = (ImageView)layout. findViewById(R.id.setting_1_icon);
Button popup_setting_1_button;
popup_setting_1_button = (Button)layout. findViewById(R.id.setting_1_button);
在以编程方式为容器充气并填充容器时,我遇到了一个非常相似的问题。 这对我有用:
LayoutInflater inflator = LayoutInflater.from(getContext());
LinearLayout viewGroup = (LinearLayout) getActivity().findViewById(
R.id.popup);
View layout = inflator.inflate(R.layout.settings_popup_layout, null);
Button button = (Button) layout.findViewById(R.id.setting_1_button);
ImageView image = (ImageView) layout.findViewById(R.id.setting_1_icon);
//bind data to view/buttons
viewGroup.addView(layout);
这是假设您的设置按钮和图像视图在设置弹出式布局内。
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