布局文件

activity_test.xml

<?xml version="1.0" encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" xmlns:app="http://schemas.android.com/apk/res-auto"> <LinearLayout android:id="@+id/linearLayout" android:orientation="vertical" app:layout_constraintStart_toStartOf="parent" app:layout_constraintBottom_toBottomOf="parent" android:background="@color/colorAccent" android:layout_width="match_parent" android:layout_height="300dp"> </LinearLayout> <View android:layout_width="match_parent" android:layout_height="100dp" app:layout_constraintTop_toTopOf="@+id/linearLayout" app:layout_constraintBottom_toTopOf="@+id/linearLayout" app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent" android:alpha="0" android:background="@android:color/white" /> <ImageView android:id="@+id/image" android:src="@mipmap/ic_launcher" app:layout_constraintTop_toTopOf="@+id/linearLayout" app:layout_constraintBottom_toTopOf="@+id/linearLayout" app:layout_constraintStart_toStartOf="parent" app:layout_constraintEnd_toEndOf="parent" android:layout_marginTop="100dp" android:layout_width="100dp" android:layout_height="100dp"/></androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

点击事件

View contentView = LayoutInflater.from(MainActivity.this).inflate(R.layout.activity_test, null); PopupWindow popWnd = new PopupWindow(MainActivity.this); popWnd.setContentView(contentView); popWnd.setWidth(ViewGroup.LayoutParams.MATCH_PARENT); popWnd.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT); popWnd.setBackgroundDrawable(new ColorDrawable(0x00000000)); popWnd.setOutsideTouchable(false); popWnd.setFocusable(true); //相对于父控件的底部显示 无任何偏移 popWnd.showAtLocation(v, Gravity.BOTTOM, 0, 0);

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