以编程方式更改 Drawable 的背景，保持拐角半径 [英] Programatically change background of Drawable, maintaining the corner radius

问题描述

interview_timeline_row.xml

<图像视图android:id="@+id/interviewTimelineRowIcon"android:layout_width="40dp"android:layout_height="40dp"机器人:layout_gravity="中心"android:adjustViewBounds="false"机器人:cropToPadding =假"机器人:填充=6dp"应用程序:layout_constraintEnd_toEndOf="父"app:layout_constraintTop_toTopOf="parent"/></LinearLayout>

timeline_row_icon_layout_bg.xml

采访时间线.java

iconBg = row.findViewById(R.id.interviewTimelineIconLayout);iconBg.setBackgroundColor(getResources().getColor(R.color.ic_rescheduled));//这是错误的处理方式

我想在我的应用程序的不同地方使用timeline_row_icon_layout_bg.xml，并且每次都应该有不同的背景颜色.如果我使用 iconBg.setBackgroundColor() 方法，那么它会忽略半径并且我有一个正方形的背景颜色.

解决方案

由于您只是使用形状来创建带有圆角和边框的布局，因此第一个选项是包裹您的 LinearLayout在 CardView 中，然后将角半径、笔划和背景颜色应用于卡片.

否则你可以使用

通过这种方式，您可以轻松更改和设置颜色背景和笔触.

interview_timeline_row.xml

<LinearLayout
    android:id="@+id/interviewTimelineIconLayout"
    android:layout_width="52dp"
    android:layout_height="52dp"
    android:layout_marginTop="20dp"
    android:background="@drawable/timeline_row_icon_layout_bg"
    android:gravity="center"
    android:orientation="horizontal"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintTop_toTopOf="parent">

    <ImageView
        android:id="@+id/interviewTimelineRowIcon"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_gravity="center"
        android:adjustViewBounds="false"
        android:cropToPadding="false"
        android:padding="6dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</LinearLayout>

timeline_row_icon_layout_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">

    <corners android:radius="@dimen/_50sdp" />

    <stroke android:width="1dp" android:color="@color/white" />

    <solid android:color="@color/ic_rescheduled"/> //need to add this programatically

</shape>

InterviewTimeline.java

iconBg = row.findViewById(R.id.interviewTimelineIconLayout);

iconBg.setBackgroundColor(getResources().getColor(R.color.ic_rescheduled)); //this is the wrong way to go about it

I want to use the timeline_row_icon_layout_bg.xml in various places in my app, and it should have a different background color each time. If I use the iconBg.setBackgroundColor() method, then it ignores the radius and I have a square background color.

解决方案

Since you are just using the shape to create a layout with rounded corners and a border, the first option is to wrap your LinearLayout inside a CardView and then apply to the card the corner radius, the stroke and the background color.

Otherwise you could use the MaterialShapeDrawable included in the Material Components Library to draw custom shapes.

Just remove from the LinearLayout the android:background:

<LinearLayout
    android:id="@+id/interviewTimelineIconLayout"
    android:layout_width=".."
    android:layout_height="..
    ..>

    <!-- ..... -->

</LinearLayout>

Then in your code you can apply a ShapeAppearanceModel. Something like:

        float radius = getResources().getDimension(R.dimen.corner_radius);

        LinearLayout linearLayout= findViewById(R.id.interviewTimelineIconLayout);
        ShapeAppearanceModel shapeAppearanceModel = new ShapeAppearanceModel()
            .toBuilder()
            .setAllCorners(CornerFamily.ROUNDED,radius)
            .build();

        MaterialShapeDrawable shapeDrawable = new MaterialShapeDrawable(shapeAppearanceModel);
        //Fill the LinearLayout with your color
        shapeDrawable.setFillColor(ContextCompat.getColorStateList(this,R.color.yourColor));
        //Stroke color and width
        shapeDrawable.setStrokeWidth(2.0f);
        shapeDrawable.setStrokeColor(...);

        ViewCompat.setBackground(linearLayout,shapeDrawable);

In this way you easily change and set the color background and the stroke.

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