//在布局中使用該控件的時(shí)候，而且有額外的style屬性的時(shí)候調(diào)用該構(gòu)造方法，
public ToggleView(Context context, AttributeSet attrs, int defStyle)；
//在布局中使用該控件的時(shí)候調(diào)用該構(gòu)造方法
public ToggleView(Context context, AttributeSet attrs)
//在Java代碼中直接new該控件的時(shí)候，調(diào)用該構(gòu)造方法
public ToggleView(Context context)

<?xml version="1.0" encoding="utf-8"?>
<resources>
 <declare-styleable name="toggle">
  <attr name="switchBackground" format="reference" />
  <attr name="slidingBackground" format="reference" />
  <attr name="toggleState" format="boolean" />
 </declare-styleable>
</resources>

<RelativeLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:hss="http://schemas.android.com/apk/res/com.hss.toggle"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 >
 <com.hss.toggle.ToggleView
 android:id="@+id/toggleView"
 android:layout_height="wrap_content"
 android:layout_width="wrap_content"
 android:layout_centerInParent="true"
 hss:switchBackground="@drawable/switch_background"
 hss:slidingBackground="@drawable/slide_button_background"
 hss:toggleState="true"
 >
 </com.hss.toggle.ToggleView>
</RelativeLayout>

xmlns:hss="http://schemas.android.com/apk/res/com.hss.toggle"

String namespace = "http://schemas.android.com/apk/res/com.hss.toggle";
int toggle_switchbackground = attrs.getAttributeResourceValue(namespace, "switchBackground", -1);
int toggle_slidingbackground = attrs.getAttributeResourceValue(namespace, "slidingBackground", -1);
toggle_state = attrs.getAttributeBooleanValue(namespace, "toggleState", false);

package com.hss.toggle;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
/**
 * 自定義開(kāi)關(guān)控件
 * @author hss
 */
public class ToggleView extends View {
 private static final String TAG = "ToogleView";
 private Bitmap sliding_background;
 private Bitmap switch_background;
 private boolean isSliding = false;
 private boolean toggle_state = false;
 private int downX;
 private mToggleStateChangeListener;
 // 構(gòu)造方法，在xml文件布局的時(shí)候，指定了style的時(shí)候調(diào)用
 public ToggleView(Context context, AttributeSet attrs, int defStyle) {
 super(context, attrs, defStyle);
 }
 // 構(gòu)造方法，在xml文件中布局的時(shí)候，沒(méi)有指定style的時(shí)候調(diào)用
 public ToggleView(Context context, AttributeSet attrs) {
 this(context, attrs, 0);
 //在Java代碼中 獲取到xml中自定義屬性對(duì)應(yīng)的值
 String namespace = "http://schemas.android.com/apk/res/com.hss.toggle";
 int toggle_switchbackground = attrs.getAttributeResourceValue(namespace, "switchBackground", -1);
 int toggle_slidingbackground = attrs.getAttributeResourceValue(namespace, "slidingBackground", -1);
 toggle_state = attrs.getAttributeBooleanValue(namespace, "toggleState", false);
 Log.i(TAG,""+toggle_slidingbackground+" "+toggle_switchbackground);
 // 設(shè)置自定義開(kāi)關(guān)的圖片
 setToggleSwitchBackground(toggle_switchbackground);
 setToggleSlidingBackground(toggle_slidingbackground);
 setToggleState(toggle_state);
 }
 // 構(gòu)造方法 在代碼中new的時(shí)候調(diào)用
 public ToggleView(Context context) {
 this(context, null);
 }
 /**
 * 給滑動(dòng)的控件設(shè)置背景圖片
 *
 * @param toggle_slidingbackground 圖片ID
 */
 private void setToggleSlidingBackground(int toggle_slidingbackground) {
 sliding_background = BitmapFactory.decodeResource(getResources(),toggle_slidingbackground);
 }
 /**
 * 給背景的控件，設(shè)置背景圖片
 *
 * @param toggle_switchbackground 圖片ID
 */
 private void setToggleSwitchBackground(int toggle_switchbackground) {
 switch_background = BitmapFactory.decodeResource(getResources(),toggle_switchbackground);
 }
 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
 //測(cè)量控件的大小，設(shè)置控件的大小為背景圖片的大小
 setMeasuredDimension(switch_background.getWidth(),switch_background.getHeight());
 }
 @Override
 protected void onDraw(Canvas canvas) {
 //開(kāi)始畫(huà)自定義控件，使用canvas對(duì)象先把背景圖片畫(huà)上來(lái)
 canvas.drawBitmap(switch_background, 0, 0, null);
 if (isSliding) {
 //如果是滑動(dòng)狀態(tài)
  //控件距離左邊的相對(duì)距離為：（控件每時(shí)每刻的距離自己左上方的焦點(diǎn)的x軸距離）-（控件本身一半的x軸寬度）
  int left = downX - sliding_background.getWidth() / 2;
  //控件最大的滑動(dòng)距離（距離左邊最大的距離）就是：（背景圖片的寬度）-（滑塊圖片的寬度）
  int rightAlign = switch_background.getWidth()- sliding_background.getWidth();
  //如果距離左邊的距離小于0，，就不讓他繼續(xù)往左邊動(dòng)了
  if (left < 0) {
  left = 0;
  } else if (left > rightAlign) {
  //如果距離左邊的距離》應(yīng)該距離左邊的最大距離，也不讓他往右邊移動(dòng)了
  left = rightAlign;
  }
  //控制好屬性之后就可以時(shí)時(shí)刻刻的跟著畫(huà)了
  canvas.drawBitmap(sliding_background, left, 0, null);
 } else {
  //如果不滑動(dòng)，則根據(jù)控件的屬性中開(kāi)關(guān)的狀態(tài)，來(lái)畫(huà)滑塊的位置
  if (toggle_state) {
  //如果開(kāi)關(guān)狀態(tài)為真，滑塊移動(dòng)到最右邊
  int left = switch_background.getWidth() - sliding_background.getWidth();
  canvas.drawBitmap(sliding_background, left, 0, null);
  } else {
  //如果開(kāi)關(guān)狀態(tài)為假，滑塊移動(dòng)到最左邊
  canvas.drawBitmap(sliding_background, 0, 0, null);
  }
 }
 super.onDraw(canvas);
 }
 @Override
 public boolean onTouchEvent(MotionEvent event) {
 //重寫(xiě)觸摸事件
 int action = event.getAction();
 switch (action) {
 case MotionEvent.ACTION_DOWN:
  //開(kāi)始點(diǎn)擊的時(shí)候，是否滑動(dòng)置為真，獲取到當(dāng)前手指的距離
  isSliding = true;
  downX = (int) event.getX();
  break;
 case MotionEvent.ACTION_MOVE:
  downX = (int) event.getX();
  break;
 case MotionEvent.ACTION_UP:
  //當(dāng)點(diǎn)擊結(jié)束的時(shí)候?qū)⑹欠窕瑒?dòng)記為假，獲取到移動(dòng)的x軸的坐標(biāo)
  downX = (int) event.getX();
  isSliding = false;
  //獲取到背景圖片中間的那個(gè)值
  int center = switch_background.getWidth() / 2;
  boolean state = downX > center;
  //如果先后的狀態(tài)不相同，則將新的狀態(tài)賦給成員變量，然后調(diào)用監(jiān)聽(tīng)的方法
  if (toggle_state != state) {
  toggle_state = state;
  if (null != mToggleStateChangeListener) {
   mToggleStateChangeListener
    .onToggleState(toggle_state);
  }
  }
  break;
 }
 //調(diào)用一次onDraw()方法
 invalidate();
 return true;
 }
 //給自定義開(kāi)關(guān)控件設(shè)置監(jiān)聽(tīng)的方法
 public void setOnToggleStateLinstener(OnToggleStateChangeListener listen){
 mToggleStateChangeListener = listen;
 }
 public void setToggleState(boolean b) {
 toggle_state = b;
 }
 //監(jiān)聽(tīng)回調(diào)接口，方法由實(shí)現(xiàn)接口的類(lèi)實(shí)現(xiàn)
 public interface OnToggleStateChangeListener {
 public void onToggleState(boolean state);
 }
}

package com.hss.toggle;
import android.app.Activity;
import android.os.Bundle;
import com.hss.toggle.ToggleView.OnToggleStateChangeListener;
import com.hss.toggle.utils.ToastUtil;
public class MainActivity extends Activity{
 private ToggleView toggleView;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 // TODO Auto-generated method stub
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 toggleView = (ToggleView) findViewById(R.id.toggleView);
 toggleView.setOnToggleStateLinstener(new OnToggleStateChangeListener() {
  @Override
  public void onToggleState(boolean state) {
  showToast(state);
  }
 });
 }
 //這里調(diào)用到的自己封裝的一個(gè)快速?gòu)桾oast的工具類(lèi)
 private void showToast(boolean state) {
 ToastUtil.makeSuddenlyToast(getApplicationContext(), state?"開(kāi)":"關(guān)");
 }
}

package com.hss.toggle.utils;
import android.content.Context;
import android.widget.Toast;
/**
 * @title Toast工具類(lèi)
 * @author hss
 */
public class ToastUtil {
 private static Toast toast;
 /**
 * 彈出短時(shí)間Toast
 * @param context 上下文對(duì)象
 * @param text 要彈出的文字
 */
 public static void makeShortToast(Context context,String text){
 toast = Toast.makeText(context, text, Toast.LENGTH_SHORT);
 toast.show();
 }
 /**
 * 彈出長(zhǎng)時(shí)間的Toast
 * @param context 上下文對(duì)象
 * @param text 要彈出的文字
 */
 public static void makeLongToast(Context context,String text){
 toast = Toast.makeText(context, text, Toast.LENGTH_LONG);
 toast.show();
 }
 /**
 * 單例Toast
 * @param context 上下文對(duì)象
 * @param text 要彈出的文字
 */
 public static void makeSuddenlyToast(Context context,String text){
 if(toast==null){
  toast = Toast.makeText(context, text, Toast.LENGTH_SHORT);
 }
 toast.setText(text);
 toast.show();
 }
}