Android自定义滑动开关控件，适合所有的android系统
我们都知道Android4.0以上才带有滑动开关Switch，那么在4.0以下呢，很多人会选择用CheckBox，放两张图片，但是这样子只能点击，效果不太好，所以我就自定义了滑动开关WiperSwitch这么一个控件，下面先把截图贴上吧，这蹩脚的图片真戳啊，大家可以自己换三张图片
[java] view plaincopy在CODE上查看代码片派生到我的代码片
package com.example.wiperswitch;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
/**
*
* @author xiaanming
*
*/
public class WiperSwitch extends View implements OnTouchListener{
private Bitmap bg_on, bg_off, slipper_btn;
/**
* 按下时的x和当前的x
*/
private float downX, nowX;
/**
* 记录用户是否在滑动
*/
private boolean onSlip = false;
/**
* 当前的状态
*/
private boolean nowStatus = false;
/**
* 监听接口
*/
private OnChangedListener listener;
public WiperSwitch(Context context) {
super(context);
init();
}
public WiperSwitch(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public void init(){
//载入图片资源
bg_on = BitmapFactory.decodeResource(getResources(), R.drawable.on_btn);
bg_off = BitmapFactory.decodeResource(getResources(), R.drawable.off_btn);
slipper_btn = BitmapFactory.decodeResource(getResources(), R.drawable.white_btn);
setOnTouchListener(this);
}
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Matrix matrix = new Matrix();
Paint paint = new Paint();
float x = 0;
//根据nowX设置背景，开或者关状态
if (nowX < (bg_on.getWidth()/2)){
canvas.drawBitmap(bg_off, matrix, paint);//画出关闭时的背景
}else{
canvas.drawBitmap(bg_on, matrix, paint);//画出打开时的背景
}
if (onSlip) {//是否是在滑动状态,
if(nowX >= bg_on.getWidth())//是否划出指定范围,不能让滑块跑到外头,必须做这个判断
x = bg_on.getWidth() - slipper_btn.getWidth()/2;//减去滑块1/2的长度
else
x = nowX - slipper_btn.getWidth()/2;
}else {
if(nowStatus){//根据当前的状态设置滑块的x值
x = bg_on.getWidth() - slipper_btn.getWidth();
}else{
x = 0;
}
}
//对滑块滑动进行异常处理，不能让滑块出界
if (x < 0 ){
x = 0;
}
else if(x > bg_on.getWidth() - slipper_btn.getWidth()){
x = bg_on.getWidth() - slipper_btn.getWidth();
}
//画出滑块
canvas.drawBitmap(slipper_btn, x , 0, paint);
}
@Override
public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:{
if (event.getX() > bg_off.getWidth() || event.getY() > bg_off.getHeight()){
return false;
}else{
onSlip = true;
downX = event.getX();
nowX = downX;
}
break;
}
case MotionEvent.ACTION_MOVE:{
nowX = event.getX();
break;
}
case MotionEvent.ACTION_UP:{
onSlip = false;
if(event.getX() >= (bg_on.getWidth()/2)){
nowStatus = true;
nowX = bg_on.getWidth() - slipper_btn.getWidth();
}else{
nowStatus = false;
nowX = 0;
}
if(listener != null){
listener.OnChanged(WiperSwitch.this, nowStatus);
}
break;
}
}
//刷新界面
invalidate();
return true;
}
/**
* 为WiperSwitch设置一个监听，供外部调用的方法
* @param listener
*/
public void setOnChangedListener(OnChangedListener listener){
this.listener = listener;
}
/**
* 设置滑动开关的初始状态，供外部调用
* @param checked
*/
public void setChecked(boolean checked){
if(checked){
nowX = bg_off.getWidth();
}else{
nowX = 0;
}
nowStatus = checked;
}
/**
* 回调接口
* @author len
*
*/
public interface OnChangedListener {
public void OnChanged(WiperSwitch wiperSwitch, boolean checkState);
}
}
用法是，先定义XML文件
[html] view plaincopy在CODE上查看代码片派生到我的代码片
<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" >
<com.example.wiperswitch.WiperSwitch
android:id="@+id/wiperSwitch1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
新建一个Activity
[java] view plaincopy在CODE上查看代码片派生到我的代码片
package com.example.wiperswitch;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import com.example.wiperswitch.WiperSwitch.OnChangedListener;
public class MainActivity extends Activity implements OnChangedListener {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//实例化WiperSwitch
WiperSwitch wiperSwitch = (WiperSwitch)findViewById(R.id.wiperSwitch1);
//设置初始状态为false
wiperSwitch.setChecked(false);
//设置监听
wiperSwitch.setOnChangedListener(this);
}
@Override
public void OnChanged(WiperSwitch wiperSwitch, boolean checkState) {
Log.e("log", "" + checkState);
}
}
代码全部上完了，写的不好的地方欢迎大牛指点！
哦，忘记了还有三张蹩脚的图片没传
感谢原作者：http://blog.csdn.net/xiaanming/article/details/8842453