Android - 片段中未显示弹出窗口答案

【问题标题】：Android - Popup window not showing in fragmentAndroid - 片段中未显示弹出窗口
【发布时间】：2015-01-28 11:29:18
【问题描述】：

我正在创建一个popupWindow，但是当我调用它时它没有显示在我的Fragment 上。
这是我的弹出窗口代码：

LayoutInflater layoutInflater = 
            (LayoutInflater)getActivity()
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View popupView = layoutInflater.inflate(R.layout.popup, null);
    final PopupWindow popupWindow = new PopupWindow(
            popupView, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);


    Button btnDismiss = (Button)popupView.findViewById(R.id.dismiss);
    btnDismiss.setOnClickListener(new Button.OnClickListener(){

        @Override
        public void onClick(View v) {
            popupWindow.dismiss();
        }});

    popupWindow.showAsDropDown(getView());
    //popupWindow.showAsDropDown(btnOpenPopup, 50, -30);
    //popupWindow.showAsDropDown(getCurrentFocus());
    popupView.setOnTouchListener(new OnTouchListener() {
        int orgX, orgY;
        int offsetX, offsetY;

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                orgX = (int) event.getX();
                orgY = (int) event.getY();
                break;
            case MotionEvent.ACTION_MOVE:
                offsetX = (int)event.getRawX() - orgX;
                offsetY = (int)event.getRawY() - orgY;
                popupWindow.update(offsetX, offsetY, -1, -1, true);
                break;
            }
            return true;
        }});

【问题讨论】：

在 popupwindow 对象上调用 show 方法。
好吧，它在公共 void popups() 中，我称片段上的弹出窗口仍然没有出现，先生

标签： android android-fragments android-popupwindow

【解决方案1】：

以下代码可能符合您的规范。从分配给视图的 OnClickListener 的 onClick(View v) 内部调用此方法：

public void showPopup(View anchorView) {

    View popupView = getLayoutInflater().inflate(R.layout.popup_layout, null);

    PopupWindow popupWindow = new PopupWindow(popupView, 
                           LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

    // Example: If you have a TextView inside `popup_layout.xml`    
    TextView tv = (TextView) popupView.findViewById(R.id.tv);

    tv.setText(....);

    // Initialize more widgets from `popup_layout.xml`
    ....
    ....

    // If the PopupWindow should be focusable
    popupWindow.setFocusable(true);

    // If you need the PopupWindow to dismiss when when touched outside 
    popupWindow.setBackgroundDrawable(new ColorDrawable());

    int location[] = new int[2];

    // Get the View's(the one that was clicked in the Fragment) location
    anchorView.getLocationOnScreen(location);

    // Using location, the PopupWindow will be displayed right under anchorView
    popupWindow.showAtLocation(anchorView, Gravity.NO_GRAVITY, 
                                     location[0], location[1] + anchorView.getHeight());

}

这里的anchorView是来自onClick(View v)的v。

【讨论】：

【解决方案2】：

使用以下代码显示弹出窗口。它会为你工作。

View popupView = layoutInflater.inflate(R.layout.popup, null);
    final PopupWindow popupWindow = new PopupWindow(
            popupView, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
popupWindow.showAtLocation(popupView , Gravity.CENTER, 0, 0);

【讨论】：

【解决方案3】：

这里是显示和隐藏弹出窗口的示例代码。

    TextView popupWindowTextView = new TextView(getActivity()); 
    Button popupWindowButton = new Button(getActivity()); 
    LinearLayout layout = new LinearLayout(getActivity()); 
    popupWindowButton.setText("OK"); 
    popupWindowTextView.setText("Popup Window. Click on OK to dismiss."); 
    popupWindowTextView.setPadding(0, 0, 0, 20); 
    layout.setOrientation(1); 
    layout.addView(popupWindowTextView); 
    layout.addView(popupWindowButton);

    int popupWindowWidth = 200;
    int popupWindowHeight = 150;
    final PopupWindow popupWindow = new PopupWindow(context);
    popupWindow.setContentView(layout);
    popupWindow.setWidth(popupWidth);
    popupWindow.setHeight(popupHeight);
    popupWindow.setFocusable(true);
    popupWindow.showAtLocation(layout, Gravity.NO_GRAVITY,    popupWindowWidth, popupWindowHeight);
    popupWindowButton.setOnClickListener(new OnClickListener() {

         @Override
         public void onClick(View v) {
           popupWindow.dismiss();
         }
    });

【讨论】：

【解决方案4】：

final PopupWindow popupWindow = new PopupWindow(
        popupView, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);

检查您使用的 LayoutParams 是否与视图的父级匹配。例如如果父级是LinearLayout，则使用LinearLayout.LayoutParams.WRAP_CONTENT

【讨论】：

这不是一回事。其他 LayoutParams 都继承自 ViewGroup.LayoutParams 的 WRAP_CONTENT 和 MATCH_PARENT；他们没有自己的价值观。

【解决方案5】：

R.layout.popup 的根应该有

android:layout_width="wrap_content"
android:layout_height="wrap_content"

【讨论】：

【解决方案6】：

只需在showAsDropDown 之后立即使用update 即可：

pop.showAsDropDown(anchor);
pop.update(0,0, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

【讨论】：