重新制作:

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

    <corners android:radius="40dp"/>

    <solid android:color="@android:color/white"/>

</shape>

to

<layer-list
        xmlns:android="http://schemas.android.com/apk/res/android">
    <item
            android:right="@dimen/_2dp"
            android:left="@dimen/_2dp"
            android:bottom="@dimen/_2dp"
            android:top="@dimen/_2dp"
            >
        <shape
                xmlns:android="http://schemas.android.com/apk/res/android">

            <corners android:radius="40dp"/>

            <solid android:color="@android:color/white"/>

        </shape>
    </item>

</layer-list>

而不是按钮使用LinearLayout与ImageView和TextView里面。在子项目，如ImageView和TextView使用android:duplicateParentState="true"。

如果可绘制资源的大小是固定的，你可以这样做:

<Button
    android:background="@drawable/rounded_button_green"
    style="?android:attr/selectableItemBackground"
    android:layout_height="wrap_content"
    app:layout_widthPercent="70%"
    android:drawableRight="@drawable/ic_clear_black_24dp"
    android:paddingRight="10dp"
    android:paddingLeft="34dp"
    tools:text="example" />

这里的关键是:

    android:drawableRight="@drawable/ic_clear_black_24dp"
    android:paddingRight="10dp"
    android:paddingLeft="34dp"

也就是说，可绘制资源的大小加上paddingRight等于paddingLeft。

您可以在本例中看到结果

TextView有一个android:drawablePadding属性，这应该做的伎俩:

android:drawablePadding The padding between the drawables and the text. Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters). This may also be a reference to a resource (in the form "@[package:]type:name") or theme attribute (in the form "?[package:][type:]name") containing a value of this type. This corresponds to the global attribute resource symbol drawablePadding.

重新制作:

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

    <corners android:radius="40dp"/>

    <solid android:color="@android:color/white"/>

</shape>

to

<layer-list
        xmlns:android="http://schemas.android.com/apk/res/android">
    <item
            android:right="@dimen/_2dp"
            android:left="@dimen/_2dp"
            android:bottom="@dimen/_2dp"
            android:top="@dimen/_2dp"
            >
        <shape
                xmlns:android="http://schemas.android.com/apk/res/android">

            <corners android:radius="40dp"/>

            <solid android:color="@android:color/white"/>

        </shape>
    </item>

</layer-list>

为你的编辑文本定义一个形状，并给它一个填充 例如

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <padding
        android:left="5dp"
        android:right="5dp"
    />
    <solid android:color="#F6F6F6" />
    <stroke
        android:width="1px"
        android:color="#C3C3C3" />

    <corners
        android:bottomLeftRadius="1dp"
        android:bottomRightRadius="1dp"
        android:topLeftRadius="1dp"
        android:topRightRadius="1dp" />
</shape>

在此形状中定义的填充将帮助为可绘制的左侧或右侧提供填充 ---------------------- 应用这个EditView形状

 <EditText
            android:id="@+id/example"
            android:layout_width="fill_parent"
            android:layout_height="36dp"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            android:background="@drawable/shape2"
            android:drawableLeft="@drawable/icon1"
            android:drawablePadding="@dimen/txtDrwblPadding"
            android:ems="10"
         />

使用定义的形状作为背景将给你的EditText一些风格加上边框drawablleft。