自定义Button 直接设置selector

朱雀 2022-08-12 12:59 150阅读 0赞

# Custom button that can implement click effect don't need create a selector.xml #

# How To Use #

## 0. create res/values/attrs.xml add code ##

<?xml version="1.0" encoding="utf-8"?>
    <resources>
    <declare-styleable name="SelectorButton">
    <attr name="normal_drawable" format="reference" />
    <attr name="pressed_drawable" format="reference" />
    </declare-styleable>
    </resources>

## 1.Create a class SeletorButton to extends Button ##

package com.example.mybutton;
    
    import android.content.Context;
    import android.content.res.TypedArray;
    import android.graphics.drawable.Drawable;
    import android.graphics.drawable.StateListDrawable;
    import android.util.AttributeSet;
    import android.widget.Button;
    
    public class SelectorButton extends Button {
        
        public SelectorButton(Context context) {
        
            super(context);
        }
        public SelectorButton(Context context, AttributeSet attrs, int defStyle) {
        
            super(context, attrs, defStyle);
        }
    
        /**
         * zyh:normal_drawable="@drawable/btn_login_normal" zyh:pressed_drawable="@drawable/btn_login_pressed"
         * @param context
         * @param attrs
         */
        public SelectorButton(Context context, AttributeSet attrs) {
        
            super(context, attrs);
    
            StateListDrawable seletor = new StateListDrawable();// 背景选择器
            Drawable n = null;
            Drawable p = null;
    
            TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.SelectorButton);
            int count = array.getIndexCount();// 获取属性个数
            System.out.println("count:" + count);
            for (int i = 0; i < count; i++) {
        
                int index = array.getIndex(i);
                System.out.println("index:" + index);
                System.out.println("draw:" + array.getDrawable(index));
                switch (index) {
        
                    case R.styleable.SelectorButton_normal_drawable:
                        n = array.getDrawable(index);
                        break;
                    case R.styleable.SelectorButton_pressed_drawable:
                        p = array.getDrawable(index);
                        break;
                }
            }
            seletor.addState(new int[] {
         android.R.attr.state_pressed }, p);
            seletor.addState(new int[] {
         android.R.attr.state_focused }, p);
            seletor.addState(new int[] {}, n);
            this.setBackgroundDrawable(seletor);
            array.recycle();
        }
    }

## 2. use in xml ##

<!-- First you should define a namespace --!>
     xmlns:zyh="http://schemas.android.com/apk/res/com.example.mybutton"
    <!--use SelectorButton--!>
     <com.example.mybutton.SelectorButton
            android:id="@+id/btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="button"
            zyh:normal_drawable="@drawable/exam_list_bg_default"
            zyh:pressed_drawable="@drawable/exam_list_bg_pressed" />

example: main.xml

## 3. use in code.java ##

SelectorButton mButton = findViewById(R.id.button);
    Drawable normalDrawable = getResources().getDrawable(R.drawable.btn_normal);
    Drawable pressedDrawable = getResources().getDrawable(R.drawable.btn_pressed);
    mButton.setSelecorDrawable(normalDrawable, pressedDrawable);

源码下载：[https://github.com/18236887539/SelectorButton][https_github.com_18236887539_SelectorButton]

[https_github.com_18236887539_SelectorButton]: https://github.com/18236887539/SelectorButton