package com.wuyudong.toggleview.ui;import android.content.Context;
import android.util.AttributeSet;
import android.view.View;/*** 自定义开关* * @author wuyudong* */
public class ToggleView extends View {/*** 用于代码创建控件* * @param context*/public ToggleView(Context context) {super(context);// TODO Auto-generated constructor stub
    }/*** 用于在xml里使用，可指定自定义属性* * @param context* @param attrs*/public ToggleView(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stub
    }/*** 用于在xml里使用，可指定自定义属性，如果指定了样式，则走此构造函数* * @param context* @param attrs* @param defStyle*/public ToggleView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);// TODO Auto-generated constructor stub
    }/*** 设置背景图* * @param switchBackground*/public void setSwitchBackgroundResource(int switchBackground) {}/*** 设置滑块图片资源* * @param slideButton*/public void setSlideButtonResource(int slideButton) {}/*** 设置开关状态* * @param b*/public void setSwitchState(boolean b) {}}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity" ><com.wuyudong.toggleview.ui.ToggleViewandroid:id="@+id/toggleView"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerInParent="true" /></RelativeLayout>

package com.wuyudong.toggleview.ui;import com.wuyudong.toggleview.R;import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;/*** 自定义开关* * @author wuyudong* */
public class ToggleView extends View {private Bitmap switchBackgroundBitmap;private Bitmap slideButtonBitmap;private boolean mSwitchState = false; //开关状态，默认关闭/*** 用于代码创建控件* * @param context*/public ToggleView(Context context) {super(context);// TODO Auto-generated constructor stub
    }/*** 用于在xml里使用，可指定自定义属性* * @param context* @param attrs*/public ToggleView(Context context, AttributeSet attrs) {super(context, attrs);// TODO Auto-generated constructor stub
    }/*** 用于在xml里使用，可指定自定义属性，如果指定了样式，则走此构造函数* * @param context* @param attrs* @param defStyle*/public ToggleView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {setMeasuredDimension(switchBackgroundBitmap.getWidth(),switchBackgroundBitmap.getHeight());}/** * Canvas: 画布，画板，在上面绘制的内容都会显示在界面上*/@Overrideprotected void onDraw(Canvas canvas) {//1、绘制背景Paint paint = new Paint();canvas.drawBitmap(switchBackgroundBitmap, 0, 0, paint);//2、绘制滑块//根据开关状态，直接设置图片位置if(mSwitchState) {int newLeft = switchBackgroundBitmap.getWidth() - slideButtonBitmap.getWidth();canvas.drawBitmap(slideButtonBitmap, newLeft, 0, paint);} else {canvas.drawBitmap(slideButtonBitmap, 0, 0, paint);}}/*** 设置背景图* * @param switchBackground*/public void setSwitchBackgroundResource(int switchBackground) {switchBackgroundBitmap = BitmapFactory.decodeResource(getResources(),switchBackground);}/*** 设置滑块图片资源* * @param slideButton*/public void setSlideButtonResource(int slideButton) {slideButtonBitmap = BitmapFactory.decodeResource(getResources(),slideButton);}/*** 设置开关状态* * @param b*/public void setSwitchState(boolean mSwitchState) {this.mSwitchState = mSwitchState;}}