How can I prevent my bottom toolbar with 3 images from being stretched out?

问题

I have a bottom layout with three images. I want them to be equally distributed. To do this, I used the layout_weight xml property. But the visual representation of them is awful – the images are all stretched out

The images' dimension is 32*32.

The layout code for this particular toolbar is:

<?xml version="1.0" encoding="utf-8"?>

 <android.support.v7.widget.Toolbar     
 xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/toolbar_bottom"
xmlns:appo="http://schemas.android.com/apk/res-auto"
android:minHeight="50dp"
android:background="#ffff8c0e"
appo:theme="@style/ToolbarTheme"
android:minWidth="50dp"
android:elevation="10dp"
>
<LinearLayout
    android:id="@+id/toolbarmenucontainer"
    android:layout_width="match_parent"
    android:weightSum="3"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <ImageView
        android:layout_width="0dp"
        android:id="@+id/camera_image"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:clickable="true"

        android:scaleType="fitXY"
        android:src="@drawable/camera_icon"
        />

    <ImageView
        android:id="@+id/news_image"
        android:layout_width="0dp"
        android:layout_height="wrap_content"

        android:clickable="true"
        android:scaleType="fitXY"
        android:layout_weight = "1"
        android:src="@drawable/new_icon"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />
    <ImageView
        android:id="@+id/facebook_image"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"

        android:clickable="true"
        android:scaleType="fitXY"
        android:src="@drawable/facebooc_image"
       />
</LinearLayout>

How can I make them appear properly?

回答1:

wrap ImageView in another layout say RelativeLayout.

i.e do something like this.

<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:appo="http://schemas.android.com/apk/res-auto"
    android:id="@+id/toolbar_bottom"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#ffff8c0e"
    android:elevation="10dp"
    android:minHeight="50dp"
    android:minWidth="50dp"
    appo:theme="@style/ToolbarTheme" >

    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/toolbarmenucontainer"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal"
        android:weightSum="3" >

        <RelativeLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1" >

            <ImageView
                android:id="@+id/camera_image"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerInParent="true"
                android:clickable="true"
                android:scaleType="fitXY"
                android:src="@drawable/camera_icon" />
        </RelativeLayout>

        <RelativeLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1" >

            <ImageView
                android:id="@+id/news_image"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentTop="true"
                android:layout_centerInParent="true"
                android:clickable="true"
                android:scaleType="fitXY"
                android:src="@drawable/new_icon" />
        </RelativeLayout>

        <RelativeLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1" >

            <ImageView
                android:id="@+id/facebook_image"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerInParent="true"
                android:clickable="true"
                android:scaleType="fitXY"
                android:src="@drawable/facebooc_image" />
        </RelativeLayout>
    </LinearLayout>
</android.support.v7.widget.Toolbar>

Hope this will help.

回答2:

Remove android:scaleType="fitXY" from your code.Because All it does is scale the bitmap up to the size of the ImageView.

Refer this.

<LinearLayout
        android:id="@+id/toolbarmenucontainer"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal"
        android:weightSum="3">

        <ImageView
            android:id="@+id/camera_image"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:clickable="true"
            android:src="@mipmap/ic_launcher" />

        <ImageView
            android:id="@+id/news_image"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:clickable="true"
            android:src="@mipmap/ic_launcher" />

        <ImageView
            android:id="@+id/facebook_image"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:clickable="true"
            android:src="@mipmap/ic_launcher" />
    </LinearLayout>

回答3:

Just use RelativeLayout like this:

<RelativeLayout  android:layout_width="match_parent"
android:layout_height="match_parent">

    <ImageView
        android:layout_width="wrap_content"
        android:id="@+id/camera_image"
        android:layout_height="wrap_content"
        android:clickable="true"
        android:src="@drawable/camera_icon"
        android:scaleType="fitXY"
        />

    <ImageView
        android:id="@+id/news_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:clickable="true"
        android:src="@drawable/new_icon"
        android:scaleType="fitXY"/>
    <ImageView
        android:id="@+id/facebook_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:layout_alignParentRight="true"
        android:clickable="true"
        android:scaleType="fitXY"
        android:src="@drawable/facebooc_image"/></RelativeLayout>

回答4:

There is this nice library that solves by problem:). It uses bottom navigation.

回答5:

set your imageview scale type as you want, there are different options

android:scaleType="fitXY"

or center, centerCrop,centerInside,fitCenter etc

来源：https://stackoverflow.com/questions/37248679/how-can-i-prevent-my-bottom-toolbar-with-3-images-from-being-stretched-out