Android自定义实现可滑动按钮

本文实例为大家分享了Android自定义实现可滑动按钮的具体代码，供大家参考，具体内容如下

实现逻辑

1.创建一个类继承view类,实现里面的onMeasure() onDraw()方法

2.在 onMeasure() 中需要调用setMeasuredDimension(viewWidth,viewheight),用来绘制按钮的位置区域

3.需要加载按钮的背景和滑块资源 并且转化为bitmap对象

4.获取背景图片的宽和高作为自定义控件的宽和高

5.获取滑块的宽度,用来调整按钮的开和关

6.在onDraw()方法中绘制出背景图片和滑块,并展示在页面中

7.创建一个触摸事件,用来监听按钮所在的位置

8.创建drawSlide方法,用来限制滑块的运行区间,防止滑块划出指定的区域,并限制按钮只有两个结果,开和关

9.根据drawSlide方法得到开关的结果,设置开关的状态

10.根据开关的状态设置开关中滑块的位置

11设.置一个回调接口,用来监听按钮的状态是否发生改变

布局文件

<?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>

核心代码

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;

@Override
protected 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();
 }

}
}
}

自定义控件代码

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);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//  super.onMeasure(widthMeasureSpec, heightMeasureSpec);
//调用setMeasuredDimension绘制按钮的区域
setMeasuredDimension(viewWidth, viewheight);
}

@Override
protected 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
@Override
public 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);
}
}

来源：https://blog.csdn.net/qq_32890771/article/details/72784073