1.编写主类
package com.sample.button; import android.content.Context; import android.content.res.TypedArray; import android.graphics.drawable.Drawable; import android.util.AttributeSet; import android.util.Log; import android.widget.CompoundButton; import com.example.buttonsample.R; public class MyButton extends CompoundButton { public MyButton(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } private Drawable imgOFF; private Drawable imgON; public MyButton(Context context, AttributeSet attrs) { super(context, attrs); TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.MyButton, 0, 0); try { imgOFF = a.getDrawable(R.styleable.MyButton_imgOFF); imgON = a.getDrawable(R.styleable.MyButton_imgON); } catch (Exception e) { e.printStackTrace(); } a.recycle(); } public MyButton(Context context) { super(context); } @Override public void setChecked(boolean checked) { super.setChecked(checked); udpateDrawable(); } private void udpateDrawable() { if (this.isChecked()) { Log.e(MyButton.class.getName(),"changing to imgON"); this.setBackgroundDrawable(imgON); } else { Log.e(MyButton.class.getName(),"changing to imgOFF"); this.setBackgroundDrawable(imgOFF); } } @Override protected void onFinishInflate() { udpateDrawable(); super.onFinishInflate(); } }
2.编写attrs定义文件(res/values/attrs.xml)
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="MyButton"> <attr name="imgON" format="reference" /> <attr name="imgOFF" format="reference" /> </declare-styleable> </resources>
3.涉及到的2个图片资源如下
res/drawable/off.png
res/drawable/on.png
4.测试用activity的layout文件
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res/com.example.buttonsample" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <com.sample.button.MyButton android:id="@+id/testmy" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@android:color/white" app:imgOFF="@drawable/off" app:imgON="@drawable/on" > </com.sample.button.MyButton> </LinearLayout>
5.实际效果即:
点击按钮时,按钮会在以下2个图片之间切换.
时间: 2024-09-30 06:54:42