Android 支付密码输入框，自定义EditText实现密码输入框功能；

刚撸出来的密码输入框，注释和逻辑看着挺清晰的，一些属性还没有添加，下个博客把属性添加上去；

看一下图：

直接看代码吧！

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.graphics.RectF;

import android.support.v7.widget.AppCompatEditText;

import android.text.InputType;

import android.util.AttributeSet;

import java.util.ArrayList;

import java.util.List;

public class PwdEditText extends AppCompatEditText {

     private Paint sidePaint , backPaint , textPaint;

     private Context mC;

     private int spzceX ,spzceY;

     private int Wide;

     private int yiInput,weiInput,backColor , textColor;

     private String mText;

     private int textLength;

     private List<RectF> rectFS;

    public PwdEditText(Context context) {

        super(context);

        mC = context;

        init();

    }

    public PwdEditText(Context context, AttributeSet attrs) {

        super(context, attrs);

        mC = context;

        init();

    }

    public PwdEditText(Context context, AttributeSet attrs, int defStyleAttr) {

        super(context, attrs, defStyleAttr);

        mC = context;

        init();

    }

    /**

     * 输入监听

     */

    interface OnTextChangeListeven{

        void onTextChange(String pwd);

    }

    private OnTextChangeListeven onTextChangeListeven;

    public void setOnTextChangeListeven(OnTextChangeListeven onTextChangeListeven){

        this.onTextChangeListeven = onTextChangeListeven;

    }

    public void clearText(){

        setText("");

        setInputType(InputType.TYPE_CLASS_NUMBER|InputType.TYPE_NUMBER_VARIATION_NORMAL);

    }

    private void init() {

        setTextColor(0X00ffffff);

        setInputType(InputType.TYPE_CLASS_NUMBER|InputType.TYPE_NUMBER_VARIATION_NORMAL);

        spzceX = dp2px(4);

        spzceY = dp2px(4);

        Wide  = dp2px(52);

        yiInput = 0xFFFF4081;

        weiInput = 0xffd0d0d0;

        backColor = 0xfff1f1f1;

        textColor = 0xFF424242;

        sidePaint = new Paint();

        backPaint = new Paint();

        textPaint = new Paint();

        rectFS = new ArrayList<>();

        mText = "" ;

        textLength = 6;

        this.setBackgroundDrawable(null);

        setLongClickable(false);

        setTextIsSelectable(false);

        setCursorVisible(false);

    }

    @Override

    protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) {

        super.onTextChanged(text, start, lengthBefore, lengthAfter);

        if (mText == null) {return;}

        //如果字数不超过用户设置的总字数，就赋值给成员变量mText；

        // 如果字数大于用户设置的总字数，就只保留用户设置的那几位数字，并把光标制动到最后，让用户可以删除；

        if (text.toString().length() <= textLength){

            mText = text.toString();

        }else{

            setText(mText);

            setSelection(getText().toString().length());  //光标制动到最后

            //setText(mText)之后键盘会还原，再次把键盘设置为数字键盘；

            setInputType(InputType.TYPE_CLASS_NUMBER|InputType.TYPE_NUMBER_VARIATION_NORMAL);

        }

        if (onTextChangeListeven != null) onTextChangeListeven.onTextChange(mText);

    }

    @Override

    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        int heightMode = MeasureSpec.getMode(heightMeasureSpec);

        int heightSize = MeasureSpec.getSize(heightMeasureSpec);

        int widthSize = MeasureSpec.getSize(widthMeasureSpec);

        switch (heightMode){

            case MeasureSpec.EXACTLY:

                heightSize = MeasureSpec.getSize(heightMeasureSpec);

                break;

            case MeasureSpec.AT_MOST:

                heightSize = widthSize/textLength;

                break;

        }

        setMeasuredDimension(widthSize,heightSize);

    }

    @Override

    protected void onDraw(Canvas canvas) {

        super.onDraw(canvas);

        //边框画笔

        sidePaint.setAntiAlias(true);//消除锯齿

        sidePaint.setStrokeWidth(3);//设置画笔的宽度

        sidePaint.setStyle(Paint.Style.STROKE);//设置绘制轮廓

        sidePaint.setColor(weiInput);

        //背景色画笔

        backPaint.setStyle(Paint.Style.FILL);

        backPaint.setColor(backColor);

        //文字的画笔

        textPaint.setTextSize(18);

        textPaint.setStyle(Paint.Style.FILL);

        textPaint.setColor(textColor);

        for (int i = 0; i < textLength; i++) {

            //区分已输入和未输入的边框颜色

            if (mText.length() >= i){

                sidePaint.setColor(yiInput);

            }else {

                sidePaint.setColor(weiInput);

            }

            //RectF的参数(left,  top,  right,  bottom); 画出每个矩形框并设置间距，间距其实是增加左边框距离，缩小上下右边框距离；

            RectF rect = new RectF(i * Wide + spzceX, spzceY,i * Wide + Wide - spzceX,Wide - spzceY); //四个值，分别代表4条线，距离起点位置的线

            canvas.drawRoundRect(rect,9,9,backPaint); //绘制背景色

            canvas.drawRoundRect(rect,9,9,sidePaint); //绘制边框；

            rectFS.add(rect);

        }

        //画密码圆点

        for (int j = 0; j < mText.length(); j++) {

            canvas.drawCircle(rectFS.get(j).centerX(),rectFS.get(j).centerY(),dp2px(5),textPaint);

        }

    }

    private int dp2px(float dpValue){

        float scale=mC.getResources().getDisplayMetrics().density;

        return (int)(dpValue*scale+0.5f);

    }

}

现在还没有添加属性，直接放上去就使用了；等属性添加完成在更新一下；

       <c.c.b.pwdinputedittext.PwdEditText

       android:layout_width="match_parent"

       android:layout_height="wrap_content"

       />

查看完整版