自定义密码框

package discount.xcar.com.myapplication;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Rect;import android.text.TextUtils;import android.util.AttributeSet;import android.util.Log;import android.view.View;import java.util.Timer;import java.util.TimerTask;/** * Created by user on 2017/5/12. */public class MyPasswordView extends View {    private int passwordLength = 4;//密码位数    private long cursorFlashTime = 500;//光标闪烁间隔时间    private int passwordPadding = dp2px(10);//每个密码间的间隔    private int passwordSize = dp2px(40);//单个密码的大小    private int borderColor = Color.parseColor("#c0c0c0");//边框颜色    private int borderWidth= dp2px(5);//下划线粗细    private int cursorPosition;//光标位置    private int cursorWidth = dp2px(2);//光标粗细    private int cursorHeight;//光标高度    private int cursorColor=Color.parseColor("#c8c8c8");//光标颜色    private boolean isCursorShowing;//光标是否正在显示中    private boolean isCursorEnable = true;//光标是否开启    private boolean isInputComplete;//是否输入完成    private int cipherTextSize;//密文符号大小    private boolean cipherEnable=true;//密文是否开启    private static String CIPHER_TEXT = "*";    private Context mContext;    private Paint mPaint;    private String []password = {"1","1","1","1"};    private TimerTask mTimerTask;    private Timer mTimer;    public MyPasswordView(Context context) {        this(context, null);    }    public MyPasswordView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public MyPasswordView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init(context);    }    private void init(Context context) {        mContext = context;        mPaint = new Paint();        mPaint.setColor(Color.GRAY);        mPaint.setAntiAlias(true);        mPaint.setStyle(Paint.Style.STROKE);        mTimerTask = new TimerTask() {            @Override            public void run() {                isCursorShowing = !isCursorShowing;                postInvalidate();            }        };        mTimer = new Timer();    }    //1、测量    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        int widthMode = MeasureSpec.getMode(widthMeasureSpec);        int width = 0;        switch (widthMode) {            case MeasureSpec.UNSPECIFIED:            case MeasureSpec.AT_MOST:                width = passwordSize * passwordLength + passwordPadding * (passwordLength - 1);                break;            case MeasureSpec.EXACTLY:                width = MeasureSpec.getSize(widthMeasureSpec);                passwordSize = (width - passwordPadding * (passwordLength - 1)) / passwordLength;                break;        }        Log.d("MyPasswordView","widht:"+width+" height:"+passwordSize);        setMeasuredDimension(width, passwordSize);    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);        //文本大小        cipherTextSize = passwordSize / 2;        //光标宽度        cursorWidth = dp2px(2);        //光标高度        cursorHeight = passwordSize / 2;    }    @Override    protected void onAttachedToWindow() {        super.onAttachedToWindow();        mTimer.schedule(mTimerTask,0,cursorFlashTime);    }    @Override    protected void onDetachedFromWindow() {        super.onDetachedFromWindow();        mTimer.cancel();    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        drawUnderLine(canvas);        drawcipherText(canvas);        drawCursor(canvas);    }    /**     * 绘制光标     * @param canvas     */    private void drawCursor(Canvas canvas) {        mPaint.setColor(cursorColor);        mPaint.setStrokeWidth(cursorWidth);        mPaint.setStyle(Paint.Style.FILL);        //光标未显示 && 开启光标 && 输入位数未满 && 获得焦点        if (!isCursorShowing && isCursorEnable && !isInputComplete) {            // 起始点x = paddingLeft + 单个密码框大小 / 2 + (单个密码框大小 + 密码框间距) * 光标下标            // 起始点y = paddingTop + (单个密码框大小 - 光标大小) / 2            // 终止点x = 起始点x            // 终止点y = 起始点y + 光标高度            canvas.drawLine((getPaddingLeft() + passwordSize / 2) + (passwordSize + passwordPadding) * cursorPosition,                    getPaddingTop() + (passwordSize - cursorHeight) / 2,                    (getPaddingLeft() + passwordSize / 2) + (passwordSize + passwordPadding) * cursorPosition,                    getPaddingTop() + (passwordSize + cursorHeight) / 2,                    mPaint);        }    }    /**     * 画下划线     * @param canvas     */    private void drawUnderLine(Canvas canvas) {        mPaint.setColor(borderColor);        mPaint.setStrokeWidth(borderWidth);        mPaint.setStyle(Paint.Style.FILL);        //循环绘制下划线        for (int i = 0; i < passwordLength; i++) {            canvas.drawLine(getPaddingLeft() + (passwordSize + passwordPadding) * i,                    (getPaddingTop() + passwordSize),                    getPaddingLeft() + (passwordSize + passwordPadding) * i+passwordSize,                    (getPaddingTop() + passwordSize), mPaint);        }    }    /**     * 绘制密码代替符号     * @param canvas     */    private void drawcipherText(Canvas canvas){        //画笔初始化        mPaint.setColor(Color.GRAY);        mPaint.setTextSize(cipherTextSize);        mPaint.setTextAlign(Paint.Align.CENTER);        mPaint.setStyle(Paint.Style.FILL);        //文字居中的处理        Rect r = new Rect();        canvas.getClipBounds(r);        int cHeight = r.height();        mPaint.getTextBounds(CIPHER_TEXT, 0, CIPHER_TEXT.length(), r);        float y = cHeight / 2f + r.height() / 2f - r.bottom;        Log.d("MyPasswordView","y:"+y+" cHeight:"+cHeight+" height:"+r.height()+" r.bottom:"+r.bottom);        //根据输入的密码位数，进行for循环绘制        for (int i = 0; i < password.length; i++) {            if (!TextUtils.isEmpty(password[i])) {                // x = paddingLeft + 单个密码框大小/2 + ( 密码框大小 + 密码框间距 ) * i                // y = paddingTop + 文字居中所需偏移量                if (cipherEnable) {                    //没有开启明文显示，绘制密码密文                    canvas.drawText(CIPHER_TEXT,                            (getPaddingLeft() + passwordSize / 2) + (passwordSize + passwordPadding) * i,                            getPaddingTop() + y, mPaint);                } else {                    //明文显示，直接绘制密码                    canvas.drawText(password[i],                            (getPaddingLeft() + passwordSize / 2) + (passwordSize + passwordPadding) * i,                            getPaddingTop() + y, mPaint);                }            }        }    }    private int dp2px(int defaultValue) {        int scale = (int) getResources().getDisplayMetrics().density;        return (int) (defaultValue * scale + 0.5);    }}