安卓自定义开关控件（带有滑动功能）

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 plain copy 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 plain copy <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 plain copy 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

转载于:https://www.cnblogs.com/wangying222/p/5363911.html

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