Android ConstraintLayout - 将一个视图放在另一个视图之上 [英] Android ConstraintLayout - Put one view on top of another view

问题描述

我正在尝试在 Button 顶部添加一个 ProgressBar(两者都在 ConstraintLayout 内).

I'm trying to add a ProgressBar on top of a Button (both are inside a ConstraintLayout).

<Button
    android:id="@+id/sign_in_button"
    android:layout_width="280dp"
    android:layout_height="75dp"
    android:layout_marginBottom="75dp"
    android:layout_marginTop="50dp"
    android:text="@string/sign_in"
    android:textColor="@color/white"
    android:textSize="22sp"
    android:textStyle="bold"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/passwordEditText"
    app:layout_constraintVertical_bias="0.0"/>

<ProgressBar
    android:id="@+id/progressBar"
    style="?android:attr/progressBarStyle"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:layout_constraintTop_toTopOf="@+id/sign_in_button"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="@+id/sign_in_button"
    android:layout_marginBottom="8dp"
    app:layout_constraintVertical_bias="0.5"
    android:layout_marginLeft="8dp"
    app:layout_constraintLeft_toLeftOf="@+id/sign_in_button"
    android:layout_marginRight="8dp"
    app:layout_constraintRight_toRightOf="@+id/sign_in_button"/>

但即使在 onCreate 中的 ProgressBar 上调用 bringToFront 之后，它也始终停留在 Button 后面.

But even after calling bringToFront on the ProgressBar in onCreate, it always stays behind the Button.

ProgressBar progressBar = (ProgressBar)findViewById(R.id.progressBar);
progressBar.bringToFront();

推荐答案

在 ProgressBar 上设置高度；2dp 似乎有效.

Set an elevation on the ProgressBar; 2dp seems to work.

android:elevation="2dp"

您也可以尝试按照对 类似问题.

You could also try setting translationZ as suggested in the accepted answer to a similar question.

我也遇到了这个答案作为替代.

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