Android自定义实现可滑动按钮

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/activity_main"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"android:orientation="vertical"tools:context="com.example.a3_.MainActivity"><com.example.a3_.MyToggleButton  android:id="@+id/myToggle"  android:layout_width="wrap_content"  android:layout_height="wrap_content" /><com.example.a3_.MyToggleButton  android:id="@+id/myToggle2"  android:layout_width="wrap_content"  android:layout_height="wrap_content" /></LinearLayout>

package com.example.a3_;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.Toast;public class MainActivity extends AppCompatActivity {private MyToggleButton toggleButton;private MyToggleButton toggleButton2;@Overrideprotected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  //初始化控件  toggleButton = (MyToggleButton) findViewById(R.id.myToggle);  //设置按钮的状态  toggleButton.setToggleStste(true);  //创建一个监听  MyListener myListener = new MyListener();  //设置监听  toggleButton.setOnToggleStateChangedListener(myListener);  //初始化控件  toggleButton2 = (MyToggleButton) findViewById(R.id.myToggle2);  //设置按钮的状态  toggleButton2.setToggleStste(true);  //创建一个监听  MyListener myListener2 = new MyListener();  //设置监听  toggleButton2.setOnToggleStateChangedListener(myListener2);}//创建一个监听class MyListener implements MyToggleButton.onToggleStateChangedListener {  @Override  public void onToggleStateChange(MyToggleButton button, boolean isToggleOn) {    //判定是哪个按钮触发了监听    switch (button.getId()) {      case R.id.myToggle:        Toast.makeText(MainActivity.this, isToggleOn ? "开1" : "关1", Toast.LENGTH_SHORT).show();        break;      case R.id.myToggle2:        Toast.makeText(MainActivity.this, isToggleOn ? "开2" : "关2", Toast.LENGTH_SHORT).show();    }  }}}

package com.example.a3_;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;/** * Created by Administrator on 2017.05.27.0027. */public class MyToggleButton extends View {private Bitmap bgBitmap;private Bitmap slidebg;private final int viewWidth;private final int viewheight;private float slidebgleft;private final int slideWidth;private final int slideMaxLeft;//设置一个成员变量,用来判定开关的状态private boolean toggleStste = false;private boolean canChangeToggleState = false;private onToggleStateChangedListener monToggleStateChangedListener = null;//创建一个开关状态改变的监听,当状态改变时触发,否则不触发public void setOnToggleStateChangedListener(onToggleStateChangedListener monToggleStateChangedListener) {  this.monToggleStateChangedListener = monToggleStateChangedListener;}public MyToggleButton(Context context, AttributeSet attrs) {  super(context, attrs);  //设置按钮的背景和滑块资源  setBackgroundAndSlideResource(R.mipmap.toogle_background, R.mipmap.toogle_slidebg);  //获取背景的高度和宽度  viewWidth = bgBitmap.getWidth();  viewheight = bgBitmap.getHeight();  //背景的宽和高就是这个自定义按钮的宽和高  //获取滑块的宽度  slideWidth = slidebg.getWidth();  //计算滑块的右边最大值  slideMaxLeft = viewWidth - slideWidth;}//定义一个方法,用来显示按钮是开还是关public void setToggleStste(boolean toggleStste) {  this.toggleStste = toggleStste;  if (toggleStste) {    slidebgleft = slideMaxLeft;  } else {    slidebgleft = 0;  }  //重新绘制  invalidate();}//设置按钮的背景和滑块资源private void setBackgroundAndSlideResource(int toogle_background, int toogle_slidebg) {  bgBitmap = BitmapFactory.decodeResource(getResources(), toogle_background);  slidebg = BitmapFactory.decodeResource(getResources(), toogle_slidebg);}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {//    super.onMeasure(widthMeasureSpec, heightMeasureSpec);  //调用setMeasuredDimension绘制按钮的区域  setMeasuredDimension(viewWidth, viewheight);}@Overrideprotected void onDraw(Canvas canvas) {  //重写drawBitmap,将控件的背景和滑块绘制到页面中  canvas.drawBitmap(bgBitmap, 0, 0, null);  drawSlide(canvas);}//通过控制slidebgleft,来控制滑块的位置private void drawSlide(Canvas canvas) {  //限制滑块的运行区间,防止滑块移动到界外  if (slidebgleft < 0) {    slidebgleft = 0;  } else if (slidebgleft > slideMaxLeft) {    slidebgleft = slideMaxLeft;  }  canvas.drawBitmap(slidebg, slidebgleft, 0, null);  if (canChangeToggleState) {    canChangeToggleState = false;    //记录上一次开关的状态    boolean lastToggleState = toggleStste;    //根据当前滑块的位置更新开关的状态    if (slidebgleft == 0) {      toggleStste = false;    } else {      toggleStste = true;    }    //如果当前的状态与上一次状态不同时,才会触发监听事件    if (lastToggleState != toggleStste && monToggleStateChangedListener != null) {      monToggleStateChangedListener.onToggleStateChange(this, toggleStste);    }  }}//设置按钮的触摸事件@Overridepublic boolean onTouchEvent(MotionEvent event) {  switch (event.getAction()) {    case MotionEvent.ACTION_DOWN:      slidebgleft = event.getX() - slideWidth / 2;      break;    case MotionEvent.ACTION_MOVE:      slidebgleft = event.getX() - slideWidth / 2;      break;    case MotionEvent.ACTION_UP:      if (event.getX() > viewWidth / 2) {        slidebgleft = slideMaxLeft;      } else {        slidebgleft = 0;      }      //只有当手机离开屏幕的是否才可以触发监听      canChangeToggleState = true;      break;  }  //重复不断地绘制  invalidate();  return true;}interface onToggleStateChangedListener {  void onToggleStateChange(MyToggleButton button, boolean isToggleOn);}}