自定义滑动开关按钮-SwitchButton-进阶

之前写过这样一个简单的控件，详情可见：[ 自定义滑动开关按钮-SwitchButton](http://blog.csdn.net/u012424449/article/details/51678311)发现还是有点不方便，存在一些问题：    1.字体没有居中显示    2.图片和字都是固定的，不灵活于是在这基础上进行了改良，效果如下，和上次效果几乎一样。本来是有点击事件的，但是这录屏软件好像屏蔽了，录制的时候不会出现，录制完了就会出现屏蔽掉的Toast。

1.首先在values目录里添加xml文件:attrs，自定义属性,具体如下：
attrs.xml

<resources>    <declare-styleable name="AutoButton">        <attr name="textOn" format="string"/>        <attr name="textOff" format="string"/>        <attr name="textSize_ab" format="dimension"/>        <attr name="bg_bitmap" format="reference"/>        <attr name="btn_bitmap" format="reference"/>    </declare-styleable></resources>

2.新建一个类继承系统View,在创建的时候获取xml中的属性，具体代码如下：

 TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AutoButton);        Drawable bg_Drawable = a.getDrawable(R.styleable.AutoButton_bg_bitmap);        Drawable btn_Drawable = a.getDrawable(R.styleable.AutoButton_btn_bitmap);        textOn = a.getString(R.styleable.AutoButton_textOn);        textOff = a.getString(R.styleable.AutoButton_textOff);        textSize = a.getDimension(R.styleable.AutoButton_textSize_ab, 35);        //注意此操作        a.recycle();        bgBitmap = ((BitmapDrawable) bg_Drawable).getBitmap();        btnBitmap = ((BitmapDrawable) btn_Drawable).getBitmap();

在上面代码我标注了注意的操作，因为TypeArray是一个单例模式，这个 array 是从一个 array pool的池中获取的。具体可以参考这篇文章：http://blog.csdn.net/Monicabg/article/details/45014327

主要也就是这两个步骤，其他的我就直接上源码了:

AuttoButton.java

import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;/** * Created by admin on 2016/6/13. * author: myc * CopyRight: * email:[e-mail] * description: */public class AutoButton extends View implements View.OnTouchListener {    //背景图片    private Bitmap bgBitmap;    //按钮图片    private Bitmap btnBitmap;    private Paint paint;    private int leftDis = 0;    //标记最大滑动    private int slidingMax;    //标记按钮开关状态    private boolean mCurrent;    //标记是否点击事件    private boolean isClickable;    //标记是否移动    private boolean isMove;    //"开"事件监听器    private SoftFloorListener softFloorListener;    //"关"事件监听器    private HydropowerListener hydropowerListener;    //标记开关文本的宽度    float width1, width2;    //记录文本中心点 cx1:绘制文本1的x坐标  cx2:绘制文本2的x坐标    //cy记录绘制文本的高度    float cx1, cy, cx2;    //定义"开"文本    String textOn;    //定义"关"文本    String textOff;    //定义文本大小    float textSize;    public AutoButton(Context context) {        this(context, null);    }    public AutoButton(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public AutoButton(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        initData(context, attrs);        initView();    }    private void initData(Context context, AttributeSet attrs) {        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AutoButton);        Drawable bg_Drawable = a.getDrawable(R.styleable.AutoButton_bg_bitmap);        Drawable btn_Drawable = a.getDrawable(R.styleable.AutoButton_btn_bitmap);        textOn = a.getString(R.styleable.AutoButton_textOn);        textOff = a.getString(R.styleable.AutoButton_textOff);        textSize = a.getDimension(R.styleable.AutoButton_textSize_ab, 35);        a.recycle();        bgBitmap = ((BitmapDrawable) bg_Drawable).getBitmap();        btnBitmap = ((BitmapDrawable) btn_Drawable).getBitmap();    }    private void initView() {        paint = new Paint();        slidingMax = bgBitmap.getWidth() - btnBitmap.getWidth();        paint.setTextSize(textSize);        width1 = paint.measureText(textOn);        cx1 = btnBitmap.getWidth() / 2 - width1 / 2;        //测量绘制文本高度        Paint.FontMetrics fontMetrics=paint.getFontMetrics();        float fontHeight=fontMetrics.bottom-fontMetrics.top;        cy = btnBitmap.getHeight() -(btnBitmap.getHeight()-fontHeight)/2-fontMetrics.bottom;        width2 = paint.measureText(textOff);        cx2 = (bgBitmap.getWidth() * 2 - btnBitmap.getWidth()) / 2 - width2 / 2;        paint.setAntiAlias(true);        setOnTouchListener(this);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        setMeasuredDimension(bgBitmap.getWidth(), bgBitmap.getHeight());    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.drawBitmap(bgBitmap, 0, 0, paint);        canvas.drawBitmap(btnBitmap, leftDis, 0, paint);        if (mCurrent) {            paint.setColor(Color.WHITE);            canvas.drawText(textOff, cx2, cy, paint);            paint.setColor(Color.BLACK);            canvas.drawText(textOn, cx1, cy, paint);        } else {            paint.setColor(Color.WHITE);            canvas.drawText(textOn, cx1, cy, paint);            paint.setColor(Color.BLACK);            canvas.drawText(textOff, cx2, cy, paint);        }    }    //刷新视图    private void flushView() {        mCurrent = !mCurrent;        if (mCurrent) {            leftDis = slidingMax;            if (hydropowerListener != null) {                hydropowerListener.hydropower();            }        } else {            leftDis = 0;            if (softFloorListener != null) {                softFloorListener.softFloor();            }        }//        System.out.println("mCurrent:="+mCurrent);        invalidate();    }    //startX 标记按下的X坐标,  lastX标记移动后的X坐标 ,disX移动的距离    float startX, lastX, disX;    @Override    public boolean onTouch(View v, MotionEvent event) {        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                isClickable = true;                startX = event.getX();                isMove = false;                break;            case MotionEvent.ACTION_MOVE:                lastX = event.getX();                disX = lastX - startX;                if (Math.abs(disX) < 5) break;                isMove = true;                isClickable = false;                moveBtn();                startX = event.getX();                break;            case MotionEvent.ACTION_UP:                if (isClickable) {                    flushView();                }                if (isMove) {                    if (leftDis > slidingMax / 2) {                        mCurrent = false;                    } else {                        mCurrent = true;                    }                    flushView();                }                break;        }        return true;    }    //移动后判断位置    private void moveBtn() {        leftDis += disX;        if (leftDis > slidingMax) {            leftDis = slidingMax;        } else if (leftDis < 0) {            leftDis = 0;        }        invalidate();    }    //设置左边按钮点击事件监听器    public void setSoftFloorListener(SoftFloorListener softFloorListener) {        this.softFloorListener = softFloorListener;    }    //设置右边按钮点击事件监听器    public void setHydropowerListener(HydropowerListener hydropowerListener) {        this.hydropowerListener = hydropowerListener;    }    //开点击事件    public interface SoftFloorListener {        void softFloor();    }    //关点击事件    public interface HydropowerListener {        void hydropower();    }}

然后就是在xml布局里调用，具体如下：

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    <!--注意此步骤-->    xmlns:myc="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    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">  <com.yigong.admin.autobutton.AutoButton      android:id="@+id/btn_switchbutton"      android:layout_width="wrap_content"      android:layout_height="wrap_content"      myc:bg_bitmap="@drawable/bg"      myc:btn_bitmap="@drawable/btn"      myc:textSize_ab="15sp"      myc:textOn="开"      myc:textOff="关"      android:padding="10dp"      android:layout_centerHorizontal="true"/></RelativeLayout>

在上面我标注了注意步骤，因为需要使用自定义的控件属性，所以需要设置xml命名空间
xmlns:myc=”http://schemas.android.com/apk/res-auto”，简单点可以这么设置，规范是
xmlns:myc=”http://schemas.android.com/apk/<这里是包名>”

MainActivity.java

public class MainActivity extends Activity {    private AutoButton btn_switchbutton;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);       initView();    }    private void initView() {        btn_switchbutton= (AutoButton) findViewById(R.id.btn_switchbutton);        btn_switchbutton.setHydropowerListener(hydropowerListener);        btn_switchbutton.setSoftFloorListener(softFloorListener);    }    AutoButton.HydropowerListener hydropowerListener=new AutoButton.HydropowerListener() {        @Override        public void hydropower() {            Toast.makeText(MainActivity.this,"关",Toast.LENGTH_SHORT).show();        }    };    AutoButton.SoftFloorListener softFloorListener=new AutoButton.SoftFloorListener() {        @Override        public void softFloor() {      Toast.makeText(MainActivity.this,"开",Toast.LENGTH_SHORT).show();        }    };}

完整代码可前往GitHub:https://github.com/yangmyc/SwitchButton
我这里设置了点击事件，因为录屏软件问题，所以没有显示，关了录屏软件后，之前的Toast就全出来了。有问题可以私聊，或者你有更好的方法，请多多指教。