Java代码更改shape和selector文件的颜色值

r囧r小猫 2021-09-17 17:38 290阅读 0赞

[Android][]里面经常会使用shape或者selector来定制一些View的背景。那么如果想要动态更改shape或者seletor文件中的颜色值，该怎么处理呢？

# 一、Java代码更改shape的颜色值 #

shape文件如下：

<?xml version="1.0" encoding="utf-8"?>
    
    <shape xmlns:android="http://schemas.android.com/apk/res/android" 
        android:shape="rectangle">
        
        
        <corners 
            android:radius="5dp"/>
        
        
        <stroke 
            android:width="1dp" 
            android:color="#709e9e9e"/>
        
        
        
    
        
        <solid android:color="#ffffffff" />
        
    </shape>

Java代码如下：

GradientDrawable myGrad = (GradientDrawable)view.getBackground();
    myGrad.setColor(ContextCompat.getColor(mContext,R.color.spinnerpop_notedit_bg_color));
    
    myGrad.setStroke(2,ContextCompat.getColor(mContext,R.color.spinnerpop_notedit_bg_color));

# 二、Java代码更改selector的颜色值 #

selector文件如下：

<?xml version="1.0" encoding="utf-8"?>
    
    <selector xmlns:android="http://schemas.android.com/apk/res/android" >
        
        
        
        <item android:state_focused="true">
            <shape>
                
                <solid android:color="#709e9e9e"/>
                
                
                
                <corners
                    android:radius="5dp" />
            </shape>
        </item>
        
        <item android:state_pressed="true">
            <shape>
                
                <solid android:color="#709e9e9e"/>
                
                
                
                <corners
                    android:radius="5dp" />
            </shape>
        </item>
        
        
        <item>
            <shape>
                
                <solid android:color="@android:color/transparent"/>
                
                
            </shape>
        </item>
    
    </selector>

java代码如下：

因为StatelistDrawable内获取状态以及drawable的方法都是被隐藏的，所以只有利用[Java][]的反射机制来获取各个状态，以及各个状态对应的drawable。

StateListDrawable mySelectorGrad = (StateListDrawable)view.getBackground();
    
                try {
                    Class slDraClass = StateListDrawable.class;
                    Method getStateCountMethod = slDraClass.getDeclaredMethod("getStateCount", new Class[0]);
                    Method getStateSetMethod = slDraClass.getDeclaredMethod("getStateSet", int.class);
                    Method getDrawableMethod = slDraClass.getDeclaredMethod("getStateDrawable", int.class);
                    int count = (Integer) getStateCountMethod.invoke(mySelectorGrad, new Object[]{});//对应item标签
                    Log.d(TAG, "state count ="+count);
                    for(int i=0;i < count;i++) {
                        int[] stateSet = (int[]) getStateSetMethod.invoke(mySelectorGrad, i);//对应item标签中的 android:state_xxxx
                        if (stateSet == null || stateSet.length == 0) {
                            Log.d(TAG, "state is null");
                            GradientDrawable drawable = (GradientDrawable) getDrawableMethod.invoke(mySelectorGrad, i);//这就是你要获得的Enabled为false时候的drawable
                            drawable.setColor(Color.parseColor(checkColor));
                        } else {
                            for (int j = 0; j < stateSet.length; j++) {
                                Log.d(TAG, "state =" + stateSet[j]);
                                Drawable drawable = (Drawable) getDrawableMethod.invoke(mySelectorGrad, i);//这就是你要获得的Enabled为false时候的drawable
    
                            }
                        }
                    }
                } catch (NoSuchMethodException e) {
                    e.printStackTrace();
                } catch (InvocationTargetException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }

android:state\_focused  对应的Java中的整型值 ： android.R.attr.state\_focused，如果为false，则对应 - android.R.attr.state\_focused【**“-”负号表示对应的属性值为false**】

android:state\_pressed   对应的Java中的整型值 ： android.R.attr.state\_pressed，如果为false，则对应 - android.R.attr.state\_pressed【**“-”负号表示对应的属性值为false**】

# 参考资料 #

[在使用shape的同时，用代码修改shape的颜色属性][shape_shape]

[获取xml里设置的statelistdrawable内的各个状态对应的drawable][xml_statelistdrawable_drawable]

[android背景选择器selector用法汇总][android_selector]

[关于自定义drawable圆角，代码中动态修改边线及填充色][drawable]

[Android]: http://lib.csdn.net/base/android
[Java]: http://lib.csdn.net/base/java
[shape_shape]: http://blog.csdn.net/wangdong20/article/details/37966333
[xml_statelistdrawable_drawable]: http://blog.csdn.net/ni357103403/article/details/50402253
[android_selector]: http://www.cnblogs.com/AceIsSunshineRain/p/5186330.html
[drawable]: http://blog.csdn.net/fallingstar2011/article/details/53707186