Android 之仿IOS6開關

不知道童學們是不是喜歡，個人覺得還是可以的，直接上代碼：

public class ToggleButton extends View {
    private SpringSystem springSystem;
    private Spring spring ;
    /** */
    private float radius;
    /** 開啟顏色*/
    private int onColor = Color.parseColor("#4ebb7f");
    /** 關閉顏色*/
    private int offBorderColor = Color.parseColor("#dadbda");
    /** 灰色帶顏色*/
    private int offColor = Color.parseColor("#ffffff");
    /** 手柄顏色*/
    private int spotColor = Color.parseColor("#ffffff");
    /** 邊框顏色*/
    private int borderColor = offBorderColor;
    /** 畫筆*/
    private Paint paint ;
    /** 開關狀態*/
    private boolean toggleOn = false;
    /** 邊框大小*/
    private int borderWidth = 2;
    /** 垂直中心*/
    private float centerY;
    /** 按鈕的開始和結束位置*/
    private float startX, endX;
    /** 手柄X位置的最小和最大值*/
    private float spotMinX, spotMaxX;
    /**手柄大小 */
    private int spotSize ;
    /** 手柄X位置*/
    private float spotX;
    /** 關閉時內部灰色帶高度*/
    private float offLineWidth;
    /** */
    private RectF rect = new RectF();
    /** 默認使用動畫*/
    private boolean defaultAnimate = true;

    /** 是否默認處於打開狀態*/
    private boolean isDefaultOn = false;

    private OnToggleChanged listener;

    private ToggleButton(Context context) {
        super(context);
    }
    public ToggleButton(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        setup(attrs);
    }
    public ToggleButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        setup(attrs);
    }

    @Override
    protected void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        spring.removeListener(springListener);
    }

    public void onAttachedToWindow() {
        super.onAttachedToWindow();
        spring.addListener(springListener);
    }

    public void setup(AttributeSet attrs) {
        paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setStyle(Style.FILL);
        paint.setStrokeCap(Cap.ROUND);

        springSystem = SpringSystem.create();
        spring = springSystem.createSpring();
        spring.setSpringConfig(SpringConfig.fromOrigamiTensionAndFriction(50, 7));

        this.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View arg0) {
                toggle(defaultAnimate);
            }
        });

        TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.ToggleButton);
        offBorderColor = typedArray.getColor(R.styleable.ToggleButton_tbOffBorderColor, offBorderColor);
        onColor = typedArray.getColor(R.styleable.ToggleButton_tbOnColor, onColor);
        spotColor = typedArray.getColor(R.styleable.ToggleButton_tbSpotColor, spotColor);
        offColor = typedArray.getColor(R.styleable.ToggleButton_tbOffColor, offColor);
        borderWidth = typedArray.getDimensionPixelSize(R.styleable.ToggleButton_tbBorderWidth, borderWidth);
        defaultAnimate = typedArray.getBoolean(R.styleable.ToggleButton_tbAnimate, defaultAnimate);
        isDefaultOn = typedArray.getBoolean(R.styleable.ToggleButton_tbAsDefaultOn, isDefaultOn);
        typedArray.recycle();

        borderColor = offBorderColor;

        if (isDefaultOn) {
            toggleOn();
        }
    }

    public void toggle() {
        toggle(true);
    }

    public void toggle(boolean animate) {
        toggleOn = !toggleOn;
        takeEffect(animate);

        if(listener != null){
            listener.onToggle(toggleOn);
        }
    }

    public void toggleOn() {
        setToggleOn();
        if(listener != null){
            listener.onToggle(toggleOn);
        }
    }

    public void toggleOff() {
        setToggleOff();
        if(listener != null){
            listener.onToggle(toggleOn);
        }
    }

    /**
     * 設置顯示成打開樣式，不會觸發toggle事件
     */
    public void setToggleOn() {
        setToggleOn(true);
    }

    /**
     * @param animate    asd
     */
    public void setToggleOn(boolean animate){
        toggleOn = true;
        takeEffect(animate);
    }

    /**
     * 設置顯示成關閉樣式，不會觸發toggle事件
     */
    public void setToggleOff() {
        setToggleOff(true);
    }

    public void setToggleOff(boolean animate) {
        toggleOn = false;
        takeEffect(animate);
    }

    private void takeEffect(boolean animate) {
        if(animate){
            spring.setEndValue(toggleOn ? 1 : 0);
        }else{
            //這裡沒有調用spring，所以spring裡的當前值沒有變更，這裡要設置一下，同步兩邊的當前值
            spring.setCurrentValue(toggleOn ? 1 : 0);
            calculateEffect(toggleOn ? 1 : 0);
        }
    }


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

        final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        final int heightMode = MeasureSpec.getMode(heightMeasureSpec);

        int widthSize = MeasureSpec.getSize(widthMeasureSpec);
        int heightSize = MeasureSpec.getSize(heightMeasureSpec);

        Resources r = Resources.getSystem();
        if(widthMode == MeasureSpec.UNSPECIFIED || widthMode == MeasureSpec.AT_MOST){
            widthSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50, r.getDisplayMetrics());
            widthMeasureSpec = MeasureSpec.makeMeasureSpec(widthSize, MeasureSpec.EXACTLY);
        }

        if(heightMode == MeasureSpec.UNSPECIFIED || heightSize == MeasureSpec.AT_MOST){
            heightSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 30, r.getDisplayMetrics());
            heightMeasureSpec = MeasureSpec.makeMeasureSpec(heightSize, MeasureSpec.EXACTLY);
        }


        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }


    @Override
    protected void onLayout(boolean changed, int left, int top, int right,
            int bottom) {
        super.onLayout(changed, left, top, right, bottom);

        final int width = getWidth();
        final int height = getHeight();

        radius = Math.min(width, height) * 0.5f;
        centerY = radius;
        startX = radius;
        endX = width - radius;
        spotMinX = startX + borderWidth;
        spotMaxX = endX - borderWidth;
        spotSize = height - 4 * borderWidth;
        spotX = toggleOn ? spotMaxX : spotMinX;
        offLineWidth = 0;
    }


    SimpleSpringListener springListener = new SimpleSpringListener(){
        @Override
        public void onSpringUpdate(Spring spring) {
            final double value = spring.getCurrentValue();
            calculateEffect(value);
        }
    };

    private int clamp(int value, int low, int high) {
        return Math.min(Math.max(value, low), high);
    }


    @Override
    public void draw(Canvas canvas) {
        //
        rect.set(0, 0, getWidth(), getHeight());
        paint.setColor(borderColor);
        canvas.drawRoundRect(rect, radius, radius, paint);

        if(offLineWidth > 0){
            final float cy = offLineWidth * 0.5f;
            rect.set(spotX - cy, centerY - cy, endX + cy, centerY + cy);
            paint.setColor(offColor);
            canvas.drawRoundRect(rect, cy, cy, paint);
        }

        rect.set(spotX - 1 - radius, centerY - radius, spotX + 1.1f + radius, centerY + radius);
        paint.setColor(borderColor);
        canvas.drawRoundRect(rect, radius, radius, paint);

        final float spotR = spotSize * 0.5f;
        rect.set(spotX - spotR, centerY - spotR, spotX + spotR, centerY + spotR);
        paint.setColor(spotColor);
        canvas.drawRoundRect(rect, spotR, spotR, paint);

    }

    /**
     * @param value
     */
    private void calculateEffect(final double value) {
        final float mapToggleX = (float) SpringUtil.mapValueFromRangeToRange(value, 0, 1, spotMinX, spotMaxX);
        spotX = mapToggleX;

        float mapOffLineWidth = (float) SpringUtil.mapValueFromRangeToRange(1 - value, 0, 1, 10, spotSize);

        offLineWidth = mapOffLineWidth;

        final int fb = Color.blue(onColor);
        final int fr = Color.red(onColor);
        final int fg = Color.green(onColor);

        final int tb = Color.blue(offBorderColor);
        final int tr = Color.red(offBorderColor);
        final int tg = Color.green(offBorderColor);

        int sb = (int) SpringUtil.mapValueFromRangeToRange(1 - value, 0, 1, fb, tb);
        int sr = (int) SpringUtil.mapValueFromRangeToRange(1 - value, 0, 1, fr, tr);
        int sg = (int) SpringUtil.mapValueFromRangeToRange(1 - value, 0, 1, fg, tg);

        sb = clamp(sb, 0, 255);
        sr = clamp(sr, 0, 255);
        sg = clamp(sg, 0, 255);

        borderColor = Color.rgb(sr, sg, sb);

        postInvalidate();
    }

    /**
     * @author ThinkPad
     *
     */
    public interface OnToggleChanged{
        /**
         * @param on     = =
         */
        public void onToggle(boolean on);
    }


    public void setOnToggleChanged(OnToggleChanged onToggleChanged) {
        listener = onToggleChanged;
    }

    public boolean isAnimate() {
        return defaultAnimate;
    }
    public void setAnimate(boolean animate) {
        this.defaultAnimate = animate;
    }

}

別忘了自定義屬性：attrs.xml

main.xml

Maintivity

public class MainActivity extends Activity {
    private ToggleButton mToggleButton01;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mToggleButton01 = (ToggleButton) findViewById(R.id.mToggleButton01);
        mToggleButton01.setOnToggleChanged(new ToggleButton.OnToggleChanged() {
            @Override
            public void onToggle(boolean on) {
                if (on) {
                    Toast.makeText(MainActivity.this, "打開", Toast.LENGTH_SHORT).show();
                }else {
                    Toast.makeText(MainActivity.this, "默認關閉", Toast.LENGTH_SHORT).show();
                }
            }
        });
//當然還可以默認設置打開狀態
//mToggleButton01.setToggleOn();

    }
}

效果圖：

猛戳這裡：studio點擊下載：