1.效果如下

306347510301723728.png

2.實(shí)現(xiàn)方式
繼承EditText,繪制矩形邊框瞻润，繪制內(nèi)部5條線店乐， 繪制中間圓點(diǎn)喉童。
3.代碼如下

public class MyEditTest extends AppCompatEditText {
    private static final String TAG = "MyEditTest";
    private int width;
    private int height;
    private int divideLineWStartX;
    private int firstCircleW;
    private int maxCount=6;
    private int inputLength;
    private Paint pLine;
    private Paint pCircle;
    private Context context;
    public MyEditTest(Context context) {
        this(context,null);
    }

    public MyEditTest(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.context=context;
        this.setBackgroundColor(Color.TRANSPARENT);//========================>>1
        this.setCursorVisible(false);//========================================>>2
        initPaint();
    }

    private void initPaint(){
        pLine=new Paint();
        pLine.setColor(Color.parseColor("#666666"));
        pLine.setAntiAlias(true);
        pLine.setStyle(Paint.Style.STROKE);

        pCircle=new Paint();
        pCircle.setColor(Color.parseColor("#333333"));
        pCircle.setAntiAlias(true);
        pCircle.setStyle(Paint.Style.FILL);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        height=h;
        width=w;
        //第一條豎線 x位置
        divideLineWStartX = w / maxCount;
        //第一個(gè)圓x 位置
        firstCircleW=divideLineWStartX/2;
    }

    @Override
    protected void onDraw(Canvas canvas) {
//        super.onDraw(canvas);=======================================>>3
        drawRect(canvas);
        drawLine(canvas);
        drawCircle(canvas);
    }

    private void drawLine(Canvas canvas) {
//        通過循環(huán)畫出每個(gè)分割線
        for (int i = 0; i < maxCount - 1; i++) {
            canvas.drawLine((i + 1) * divideLineWStartX,
                    0,
                    (i + 1) * divideLineWStartX,
                    height,
                    pLine);
        }
    }

    private void drawCircle(Canvas canvas) {
        for (int i = 0; i < inputLength; i++) {
            canvas.drawCircle(firstCircleW + i * 2 * firstCircleW,
                    height/2,
                    dp2px(context,5),
                    pCircle);
        }
    }

    private void drawRect(Canvas canvas) {
        canvas.drawRoundRect(new RectF(0,0,width,height),dp2px(context,2),dp2px(context,2),pLine);
    }

    @Override
    protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
        super.onTextChanged(text, start, lengthBefore, lengthAfter);
        inputLength=text.length();
        if (inputLength>=6){
            this.setEnabled(false);
            backData.onDataBack(text.toString());
        }
        invalidate();
    }


    public void setBackData(OnBackData backData) {
        this.backData = backData;
    }

    /**
     * 根據(jù)手機(jī)的分辨率從 dp 的單位 轉(zhuǎn)成為 px(像素)
     */
    public static int dp2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }

    private OnBackData backData;
    public interface OnBackData{
        /**
         * 6位數(shù)字密碼
         * @param pwd
         */
        void onDataBack(String pwd);
    }
}

4.繪制矩形邊框撇寞、繪制內(nèi)部5豎條線倒挺容易，在繪制圓點(diǎn)時(shí)堂氯，需要重寫“onTextChanged”方法蔑担，在里面判斷輸入字符的長(zhǎng)度，根據(jù)字符的長(zhǎng)度咽白，繪制圓點(diǎn)的個(gè)數(shù)啤握。

    @Override
    protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {
        super.onTextChanged(text, start, lengthBefore, lengthAfter);
        inputLength=text.length();
        if (inputLength>=6){
            this.setEnabled(false);
            backData.onDataBack(text.toString());
        }
        invalidate();
    }

5.注意“1”處，去掉edittext自帶的紅色背景線晶框，“2”處去掉不斷閃爍的焦點(diǎn)指示圖標(biāo)排抬，“3”處“ super.onDraw(canvas);”如果不注釋掉，會(huì)繪制原本輸入的字符授段。