本文实例为大家分享了Android实现一个仿支付宝支付密码的输入框，主要实现如下：
PasswordView.java
package com.jackie.alipay.password; import android.annotation.TargetApi; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.os.Build; import android.util.AttributeSet; import android.widget.EditText; import android.widget.Toast; /** * Created by Administrator on 2016/10/31. */ public class PasswordView extends EditText { private Paint mBorderPaint; //外框画笔 private Paint mLinePaint; //线的画笔 private Paint mPasswordPaint; //密码画笔 private int mPasswordTextLength; //输入密码的长度 private int mWidth; private int mHeight; private static final int PASSWORD_LENGTH = 6;//密码的长度 private static final int PASSWORD_RADIUS = 15; public PasswordView(Context context) { this(context, null); } public PasswordView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public PasswordView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initView(); } private void initView() { setFocusable(true); mBorderPaint = new Paint(); mBorderPaint.setStrokeWidth(8); mBorderPaint.setColor(Color.WHITE); mBorderPaint.setStyle(Paint.Style.FILL); mLinePaint = new Paint(); mLinePaint.setColor(Color.parseColor("#838B8B")); mLinePaint.setStrokeWidth(4); mPasswordPaint = new Paint(); mPasswordPaint.setColor(Color.BLACK); mPasswordPaint.setStrokeWidth(12); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); mWidth = getMeasuredWidth(); mHeight = getMeasuredHeight(); drawRoundRect(canvas); drawLine(canvas); drawPassword(canvas); } /** * 绘制圆角矩形背景 * @param canvas */ @TargetApi(Build.VERSION_CODES.LOLLIPOP) private void drawRoundRect(Canvas canvas) { canvas.drawRoundRect(0, 0, mWidth, mHeight, 12, 12, mBorderPaint); } /** * 绘制分割线 * @param canvas */ private void drawLine(Canvas canvas) { for (int i = 1; i < PASSWORD_LENGTH; i++) { float x = mWidth * i / PASSWORD_LENGTH; canvas.drawLine(x, 12, x, mHeight - 12, mLinePaint); } } /** * 绘制密码 * @param canvas */ private void drawPassword(Canvas canvas) { float cx, cy = mHeight / 2; float half = mWidth / PASSWORD_LENGTH / 2; for (int i = 0; i < mPasswordTextLength; i++) { cx = mWidth * i / PASSWORD_LENGTH + half; canvas.drawCircle(cx, cy, PASSWORD_RADIUS, mPasswordPaint); } } @Override protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) { super.onTextChanged(text, start, lengthBefore, lengthAfter); mPasswordTextLength = text.toString().length(); if (mPasswordTextLength == PASSWORD_LENGTH) { Toast.makeText(getContext(), "您设置的密码为: " + text, Toast.LENGTH_SHORT).show();; } invalidate(); } public void reset(){ setText(""); invalidate(); } }
效果图如下：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持查字典教程网。
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