Android自定义控件实现滑动开关效果

//在布局中使用该控件的时候，而且有额外的style属性的时候调用该构造方法，public ToggleView(Context context, AttributeSet attrs, int defStyle)；//在布局中使用该控件的时候调用该构造方法public ToggleView(Context context, AttributeSet attrs)//在Java代码中直接new该控件的时候，调用该构造方法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>

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;/** * 自定义开关控件 * @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; // 构造方法，在xml文件布局的时候，指定了style的时候调用 public ToggleView(Context context, AttributeSet attrs, int defStyle) {  super(context, attrs, defStyle); } // 构造方法，在xml文件中布局的时候，没有指定style的时候调用 public ToggleView(Context context, AttributeSet attrs) {  this(context, attrs, 0);  //在Java代码中 获取到xml中自定义属性对应的值  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);  // 设置自定义开关的图片  setToggleSwitchBackground(toggle_switchbackground);  setToggleSlidingBackground(toggle_slidingbackground);  setToggleState(toggle_state); } // 构造方法 在代码中new的时候调用 public ToggleView(Context context) {  this(context, null); } /**  * 给滑动的控件设置背景图片  *   * @param toggle_slidingbackground 图片ID  */ private void setToggleSlidingBackground(int toggle_slidingbackground) {  sliding_background = BitmapFactory.decodeResource(getResources(),toggle_slidingbackground); } /**  * 给背景的控件，设置背景图片  *   * @param toggle_switchbackground 图片ID  */ private void setToggleSwitchBackground(int toggle_switchbackground) {  switch_background = BitmapFactory.decodeResource(getResources(),toggle_switchbackground); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  //测量控件的大小，设置控件的大小为背景图片的大小  setMeasuredDimension(switch_background.getWidth(),switch_background.getHeight()); } @Override protected void onDraw(Canvas canvas) {  //开始画自定义控件，使用canvas对象先把背景图片画上来  canvas.drawBitmap(switch_background, 0, 0, null);  if (isSliding) {  //如果是滑动状态   //控件距离左边的相对距离为：（控件每时每刻的距离自己左上方的焦点的x轴距离）-（控件本身一半的x轴宽度）   int left = downX - sliding_background.getWidth() / 2;   //控件最大的滑动距离（距离左边最大的距离）就是：（背景图片的宽度）-（滑块图片的宽度）   int rightAlign = switch_background.getWidth()- sliding_background.getWidth();   //如果距离左边的距离小于0，，就不让他继续往左边动了   if (left < 0) {    left = 0;   } else if (left > rightAlign) {    //如果距离左边的距离》应该距离左边的最大距离，也不让他往右边移动了    left = rightAlign;   }   //控制好属性之后就可以时时刻刻的跟着画了   canvas.drawBitmap(sliding_background, left, 0, null);  } else {   //如果不滑动，则根据控件的属性中开关的状态，来画滑块的位置   if (toggle_state) {    //如果开关状态为真，滑块移动到最右边    int left = switch_background.getWidth() - sliding_background.getWidth();    canvas.drawBitmap(sliding_background, left, 0, null);   } else {    //如果开关状态为假，滑块移动到最左边    canvas.drawBitmap(sliding_background, 0, 0, null);   }  }  super.onDraw(canvas); } @Override public boolean onTouchEvent(MotionEvent event) {  //重写触摸事件  int action = event.getAction();  switch (action) {  case MotionEvent.ACTION_DOWN:   //开始点击的时候，是否滑动置为真，获取到当前手指的距离   isSliding = true;   downX = (int) event.getX();   break;  case MotionEvent.ACTION_MOVE:   downX = (int) event.getX();   break;  case MotionEvent.ACTION_UP:   //当点击结束的时候将是否滑动记为假，获取到移动的x轴的坐标   downX = (int) event.getX();   isSliding = false;   //获取到背景图片中间的那个值   int center = switch_background.getWidth() / 2;   boolean state = downX > center;   //如果先后的状态不相同，则将新的状态赋给成员变量，然后调用监听的方法   if (toggle_state != state) {    toggle_state = state;    if (null != mToggleStateChangeListener) {     mToggleStateChangeListener       .onToggleState(toggle_state);    }   }   break;  }  //调用一次onDraw()方法  invalidate();  return true; } //给自定义开关控件设置监听的方法 public void setOnToggleStateLinstener(OnToggleStateChangeListener listen){  mToggleStateChangeListener = listen; } public void setToggleState(boolean b) {  toggle_state = b; } //监听回调接口，方法由实现接口的类实现 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);   }  }); } //这里调用到的自己封装的一个快速弹Toast的工具类 private void showToast(boolean state) {  ToastUtil.makeSuddenlyToast(getApplicationContext(), state?"开":"关"); }}

package com.hss.toggle.utils;import android.content.Context;import android.widget.Toast;/** * @title Toast工具类 * @author hss */public class ToastUtil { private static Toast toast; /**  * 弹出短时间Toast  * @param context 上下文对象  * @param text 要弹出的文字  */ public static void makeShortToast(Context context,String text){  toast = Toast.makeText(context, text, Toast.LENGTH_SHORT);  toast.show(); } /**  * 弹出长时间的Toast  * @param context 上下文对象  * @param text 要弹出的文字  */ public static void makeLongToast(Context context,String text){  toast = Toast.makeText(context, text, Toast.LENGTH_LONG);  toast.show(); } /**  * 单例Toast  * @param context 上下文对象  * @param text 要弹出的文字  */ public static void makeSuddenlyToast(Context context,String text){  if(toast==null){   toast = Toast.makeText(context, text, Toast.LENGTH_SHORT);  }  toast.setText(text);  toast.show(); }}