自定义view的简单操作

MainActivity里面的显示控件和方法

package com.example.zidingyiview2;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.support.annotation. Nullable;

import android.util.AttributeSet;

import android.view.View; /** * Created by Administrator on 2018/3/11. */

public class ToggleButton extends View {

boolean state = false;

Bitmap buttonBackGroud ;

Bitmap buttonslidingBack;

//测量 -- 测量的模式，加上测量的大小 measure --- onmeasure setMeasuredDimension  

@Override protected void onMeasure( int widthMeasureSpec, int heightMeasureSpec) {

super.onMeasure(widthMeasureSpec, heightMeasureSpec);

setMeasuredDimension( buttonBackGroud.getWidth(), buttonBackGroud.getHeight());

}

@Override protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

/** * 第一个参数是要画的图片  

* 第二个参数是离左边的距离

* 第三个参数是离顶部的距离  

* 第四个参娄是画笔  

*/  

canvas.drawBitmap( buttonBackGroud, 0, 0, null);

//画滑动块  

if ( state){

//是开的状态

canvas.drawBitmap( buttonslidingBack, buttonBackGroud.getWidth()- buttonslidingBack.getWidth(), 0, null

);

} else{

//关的状态 canvas.drawBitmap( buttonslidingBack, 0, 0, null);

}

}

public ToggleButton(Context context, @Nullable AttributeSet attrs) {

super(context, attrs);

}

/** * 开关的状态 true是开的状态 false是关的状态 */

public void setState( boolean flag) {

state = flag;

}

//开关的背影图片  

public void seButtonBackGround( int switch_background) {

buttonBackGroud = BitmapFactory. decodeResource(getResources(),switch_background);

}

//滑动块的背景图片

public void setSlidingBack( int slide_button_background) {

buttonslidingBack = BitmapFactory. decodeResource(getResources(),slide_button_background);

}

}