android 动态创建selector状态选择器动态创建Drawable

最近在做一个使用接口返回的字符串："#ff0000" 来动态设置drawable背景颜色与动态设置状态选择器selector的需求，之前写习惯了shape的xml，还是第一次写动态的，有点搞笑，搞笑的是自己没写过，不知道会不会写。

1.很简单，直接布局代码：

<RelativeLayoutandroid:id="@+id/ll_title"android:layout_width="match_parent"android:layout_marginRight="20dp"android:layout_marginLeft="20dp"android:layout_height="50dp"app:contentInsetStart="0dp"android:background="@drawable/shape_red_bg"tools:ignore="MissingConstraints"><TextViewandroid:id="@+id/toolbar_left"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerVertical="true"android:layout_marginLeft="10dp"android:gravity="center"android:singleLine="true"android:text="菜单"android:textColor="@color/white"android:textSize="16dp"android:visibility="visible" /><TextViewandroid:id="@+id/toolbar_title"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="center"android:singleLine="true"android:text="居中标题"android:layout_centerInParent="true"android:textColor="@android:color/white"android:textSize="20dp"android:visibility="visible" /><TextViewandroid:id="@+id/toolbar_right"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_gravity="right"android:layout_marginRight="10dp"android:gravity="center"android:layout_alignParentRight="true"android:layout_centerVertical="true"android:text="秘密"android:textColor="@color/white"android:textSize="16dp"android:visibility="visible" /></RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"android:shape="rectangle"><!--    <size android:height="417dp" android:width="834dp"/>--><gradientandroid:gradientRadius="417dp"android:startColor="@color/red"android:endColor="@color/red"android:centerX="0.5"android:centerY="1"android:type="radial" /><cornersandroid:bottomLeftRadius="0dp"android:bottomRightRadius="0dp"android:topLeftRadius="0dp"android:topRightRadius="0dp" />
</shape>

2.Activity代码如下：

//在Activity的初始化中直接复制下面代码：
RelativeLayout llTitle = findViewById(R.id.ll_title);
llTitle.setBackgroundDrawable(getStateListDrawable());llTitle.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {}});//在Activity中的方法
public static StateListDrawable getStateListDrawable() {StateListDrawable selector = new StateListDrawable();int parseColor = Color.parseColor("#FF00FF");Drawable pressDrawable = getRoundRectDrawable(20, Color.parseColor("#ff00ff"), true, 0);Drawable selectDrawable = getRoundRectDrawable(20, Color.parseColor("#00ffff"), true, 0);Drawable defaultDrawable = getRoundRectDrawable(20, Color.parseColor("#00ffff"), true, 0);selector.addState(new int[]{android.R.attr.state_pressed}, pressDrawable);selector.addState(new int[]{android.R.attr.state_selected}, selectDrawable);// 添加一个默认状态, 默认状态必须写在其他状态的最后面, 否则其他状态失效selector.addState(new int[]{}, defaultDrawable);return selector;}public static GradientDrawable getRoundRectDrawable(int radius, int color, boolean isFill, int strokeWidth){//左上、右上、右下、左下的圆角半径float[] radiusList = {radius, radius, radius, radius, radius, radius, radius, radius};GradientDrawable drawable = new GradientDrawable();drawable.setCornerRadii(radiusList);drawable.setColor(isFill ? color : Color.TRANSPARENT);drawable.setStroke(isFill ? 0 : strokeWidth, color);return drawable;}

//补充设置渐变色
public static GradientDrawable getRoundRectDrawable(int radius, int color, boolean isFill, int strokeWidth){//左上、右上、右下、左下的圆角半径float[] radiusList = {radius, radius, radius, radius, radius, radius, radius, radius};GradientDrawable drawable = new GradientDrawable();//设置渐变色,渐变方向从左上到右下，渐变颜色设置GradientDrawable gradientDrawable = new GradientDrawable(GradientDrawable.Orientation.TL_BR,new int[]{R.color.blue_0B1152, R.color.blue_4E5988});drawable.setCornerRadii(radiusList);drawable.setColor(isFill ? color : Color.TRANSPARENT);drawable.setStroke(isFill ? 0 : strokeWidth, color);return drawable;}

亲测有效，写这篇文章只是想记录一下完整的实现代码。