PopupWindow 弹出在控件上

怼烎@ 2022-06-08 14:52 384阅读 0赞

**popupWindow的布局文件popup.xml**

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_parent" android:layout_height="wrap_content" android:background="#206d95e5" android:orientation="vertical" >
    
        <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="10dp" android:text="popupWindow" android:textSize="16sp" />
    
        <Button android:id="@+id/btn" android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="10dp" android:text="button" android:textSize="16sp" />
    
    </LinearLayout>

**Activity中弹出PopupWindow**

public void showPopupWindow(View v){
    
            View contentView = LayoutInflater.from(MainActivity.this).inflate(R.layout.popup, null);
            Button button = (Button) contentView.findViewById(R.id.btn);
            final PopupWindow popupWindow = new PopupWindow(contentView,
                    LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT, true);
            popupWindow.setTouchable(true);
    
            button.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    Toast.makeText(MainActivity.this, "onclick==action",
                            Toast.LENGTH_SHORT).show();
                }
            });
    
            //检测屏幕消失的事件
            popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
                @Override
                public void onDismiss() {
                    Log.d("Chunna.zheng","popupwindow消失啦！");
                }
            });
    
            // 如果不设置PopupWindow的背景，无论是点击外部区域还是Back键都无法dismiss弹框
            popupWindow.setBackgroundDrawable(getResources().getDrawable(
                    R.mipmap.ic_launcher));
    
            //获取自身的长宽高
            contentView.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
            int popupHeight = contentView.getMeasuredHeight();
            int popupWidth = contentView.getMeasuredWidth();
    
            //获取控件在屏幕上的位置，并赋值给location数组
            int[] location = new int[2];
            v.getLocationOnScreen(location);
    
            //在控件上方显示
            popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, (location[0]), location[1] - popupHeight/2);
    
            // 如果要在控件下方显示，则使用这个方法
            //popupWindow.showAsDropDown(v);
        }