自定义开关按钮

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效果图
这里写图片描述
XML文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context=".MainActivity" >    <com.example.slidebtn.SlideBtton        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerInParent="true" /></RelativeLayout>

主Activity

package com.example.slidebtn;import android.os.Bundle;import android.app.Activity;import android.view.Menu;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }}

自定义view

package com.example.slidebtn;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Paint;import android.util.AttributeSet;import android.view.View;/** * 创建自定义View的一般步骤 1.创建自定义view对象 构造方法  * 2.确定view的尺寸 onMeasure(intwidthMeasureSpec,int heightMeasureSpec)  * 3.绘制view onDraw(Canvas canvas) * 4.确定在父View中的位置  onLayout()  通常我们并不关心这个方法 * */public class SlideBtton extends View implements        android.view.View.OnClickListener {    /**     * 确定在父view中的位置     * */    @Override    protected void onLayout(boolean changed, int left, int top, int right,            int bottom) {        // TODO Auto-generated method stub        super.onLayout(changed, left, top, right, bottom);    }    private Bitmap bg, btn;    private int bg_w, bg_h, btn_w;    private Paint paint;    private float start_offset;    boolean isopen = false;    /**     * 加载布局文件时调用     * */    public SlideBtton(Context context, AttributeSet attrs) {        super(context, attrs);        // 初始化资源        inite();    }    private void inite() {        bg = BitmapFactory.decodeResource(getResources(),                R.drawable.switch_background);        btn = BitmapFactory.decodeResource(getResources(),                R.drawable.slide_button);        bg_w = bg.getWidth();        bg_h = bg.getHeight();        btn_w = btn.getWidth();        paint = new Paint();        // 设置抗锯齿        paint.setAntiAlias(true);        setOnClickListener(this);    }    /**     * 绘制View     * */    @Override    protected void onDraw(Canvas canvas) {        canvas.drawBitmap(bg, 0, 0, paint);        canvas.drawBitmap(btn, start_offset, 0, paint);    }    /**     * 确定View的尺寸     * */    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        setMeasuredDimension(bg_w, bg_h);    }    @Override    public void onClick(View v) {        isopen = !isopen;        if (isopen) {            start_offset = bg_w - btn_w;        } else {            start_offset = 0;        }        //通知重新绘制        invalidate();    }}

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