Drawable 分为两种，一种是普通的图片资源，另一种是 xml 形式的 Drawable 资源，这里针对第二种形式的 Drawable 资源展示其几种表现效果
一、圆角按钮
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#f42791fa" />
<corners android:radius="20dp" />
</shape>
二、带边框的圆角按钮
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#f42791fa" />
<corners android:radius="20dp" />
<stroke
android:width="2dp"
android:color="#ec8989" />
</shape>
三、单个边框的按钮
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape>
<solid android:color="#f42791fa" />
</shape>
</item>
<item
android:left="4dp"
android:right="4dp">
<shape>
<solid android:color="#cef1bd45" />
</shape>
</item>
</layer-list>
四、渐变按钮
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<gradient
android:angle="90"
android:endColor="#f4f55d58"
android:gradientRadius="45"
android:startColor="#ee13d6fc"
android:type="linear"/>
</shape>
五、带点击反馈的按钮
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<shape>
<solid android:color="#61aaf4" />
</shape>
</item>
<item android:state_pressed="false">
<shape>
<solid android:color="#ed635c" />
</shape>
</item>
</selector>
六、带点击反馈的圆角按钮
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<shape>
<solid android:color="#f8ec6141"/>
<corners android:radius="20dp"/>
</shape>
</item>
<item android:state_pressed="false">
<shape>
<solid android:color="#50b4f2"/>
<corners android:radius="20dp"/>
</shape>
</item>
</selector>
七、带阴影的按钮
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:left="2dp"
android:top="4dp">
<shape>
<solid android:color="@android:color/darker_gray"/>
<corners android:radius="20dp"/>
</shape>
</item>
<item
android:bottom="4dp"
android:right="2dp">
<shape>
<solid android:color="#f92aa4f5"/>
<corners android:radius="20dp"/>
</shape>
</item>
</layer-list>
八、带虚线边框的文本
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#00ffffff" />
<stroke
android:width="1dp"
android:color="#272133"
android:dashGap="5dp"
android:dashWidth="6dp" />
<size android:height="1dp" />
<corners android:radius="36dp" />
</shape>
九、带虚线边框和点击反馈的按钮
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<shape android:shape="rectangle">
<solid android:color="#00ffffff" />
<!--每条线的宽度是：dashWidth 线之间的宽度是：dashGap-->
<stroke android:width="1dp" android:color="#272133" android:dashGap="10dp" android:dashWidth="10dp" />
<size android:height="1dp" />
<corners android:radius="30dp" />
</shape>
</item>
<item android:state_pressed="false">
<shape android:shape="rectangle">
<solid android:color="#00ffffff" />
<!--每条线的宽度是：dashWidth 线之间的宽度是：dashGap-->
<stroke android:width="1dp" android:color="#e45d5d" android:dashGap="10dp" android:dashWidth="10dp" />
<size android:height="1dp" />
<corners android:radius="30dp" />
</shape>
</item>
</selector>
十、带点击动画的按钮
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<set>
<objectAnimator
android:duration="600"
android:interpolator="@android:anim/accelerate_interpolator"
android:propertyName="scaleX"
android:repeatCount="1"
android:valueFrom="1"
android:valueTo="0.85"
android:valueType="floatType" />
<objectAnimator
android:duration="600"
android:interpolator="@android:anim/accelerate_interpolator"
android:propertyName="scaleY"
android:valueFrom="1"
android:valueTo="0.85"
android:valueType="floatType" />
</set>
</item>
<item android:state_pressed="false">
<set>
<objectAnimator
android:duration="200"
android:interpolator="@android:anim/accelerate_interpolator"
android:propertyName="scaleX"
android:valueFrom="1"
android:valueTo="0.85"
android:valueType="floatType" />
<objectAnimator
android:duration="200"
android:interpolator="@android:anim/accelerate_interpolator"
android:propertyName="scaleY"
android:valueFrom="1"
android:valueTo="0.85"
android:valueType="floatType" />
</set>
</item>
</selector>
十一、着色
将以下图片渲染为红色
<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
android:src="@drawable/image3"
android:tint="#f9552c"/>
十二、图片渐变切换
<?xml version="1.0" encoding="utf-8"?>
<transition xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/image1"/>
<item android:drawable="@drawable/image2"/>
</transition>
将以上 drawable 设为 ImageView 的背景，再用代码控制图片渐变切换
final ImageView imageView = findViewById(R.id.image);
imageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
TransitionDrawable drawable = (TransitionDrawable) imageView.getBackground();
drawable.startTransition(3000);
}
});
十三、圆环
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:innerRadius="20dp"
android:shape="ring"
android:thickness="8dp"
android:useLevel="false">
<gradient
android:angle="0"
android:centerColor="#9f36f588"
android:endColor="#4192f5"
android:startColor="#d8f7583c"
android:type="sweep"
android:useLevel="false"/>
</shape>
十四、红色圆点
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<solid android:color="#ea5656"/>
<size
android:width="10dp"
android:height="10dp"/>
</shape>
以上示例代码放在了我的一个开源库内，专门用来收集 Android 开发中的工具类，项目地址：AndroidUtils
关于 AndroidUtils 的介绍可以看这里：AndroidUtils
