效果

自定义密码输入框，项目的一个界面需求，我把这个自定义的输入框提取出来作为这次内容的题目。

输入前:

输入后：

输入1个字符就红一个圈圈，很简单的效果。

思路

1.自定义EditText。

2.背景为一个外圆环加内实心圆。

3.edittext的长度变化时候重新绘制背景或者红色环位置。

关键代码

代码其实也很简单，顺手拿资源的请到文末。

1.画背景

/** * 绘制背景外圆 */ private void drawOutRing(Canvas canvas) { mPaint.setColor(mBgColor); // 设置画笔为空心 mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeWidth(mBgSize); RectF rectF = new RectF(mBgSize, mBgSize, getWidth() - mBgSize, getHeight() - mBgSize); // 画圆 for (int i = 0; i < mPasswordNumber; i++) { int cx = i * mDivisionLineSize + i * mPasswordItemWidth + mPasswordItemWidth / 2 + mBgSize; canvas.drawCircle(cx, getHeight() / 2, mOutRadius, mPaint); } }

2.画实心内圆背景

/** * 绘制背景内圆 */ private void drawInRing(Canvas canvas) { mPaint.setColor(mDivisionLineColor); // 设置画笔为实心 mPaint.setStyle(Paint.Style.FILL); // 画圈圈 for (int i = 0; i < mPasswordNumber; i++) { int cx = i * mDivisionLineSize + i * mPasswordItemWidth + mPasswordItemWidth / 2 + mBgSize; canvas.drawCircle(cx, getHeight() / 2, mPasswordRadius, mPaint); } }}

3.绘制输入密码的变化动作

/** * 绘制隐藏的密码 */ private void drawHidePassword(Canvas canvas) { int passwordLength = getText().length(); if (passwordLength > 6) passwordLength = 6; mPaint.setColor(mPasswordColor); // 画实心内圆 mPaint.setStyle(Paint.Style.FILL); for (int i = 0; i < passwordLength; i++) { int cx = i * mDivisionLineSize + i * mPasswordItemWidth + mPasswordItemWidth / 2 + mBgSize; canvas.drawCircle(cx, getHeight() / 2, mPasswordRadius, mPaint); } //外圆颜色 mPaint.setColor(mPasswordColor); // 设置画笔为空心 mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeWidth(mBgSize); RectF rectF = new RectF(mBgSize, mBgSize, getWidth() - mBgSize, getHeight() - mBgSize); // 画空心外圆 for (int i = 0; i < passwordLength; i++) { int cx = i * mDivisionLineSize + i * mPasswordItemWidth + mPasswordItemWidth / 2 + mBgSize; canvas.drawCircle(cx, getHeight() / 2, mOutRadius, mPaint); } }

4.重写onDraw

int passwordWidth = getWidth() - (mPasswordNumber - 1) * mDivisionLineSize; mPasswordItemWidth = passwordWidth / mPasswordNumber; // 绘制背景外圆 drawOutRing(canvas); // 绘制背景内圆 drawInRing(canvas); // 绘制密码 drawHidePassword(canvas);

5.xml引用

<com***.PasswordView android:id="@+id/password" android:layout_width="240dp" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_marginTop="10dp" android:background="@null"> </com***.PasswordView>

6.还可以设置些属性

在sytle中设置，通过xml中的app：xxx引用。

<com.*.PasswordView android:id="@+id/password" android:layout_width="240dp" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_marginTop="10dp" xmlns:app="http://schemas.android.com/apk/res-auto" app:bgColor="#ffffff" android:background="@null"> </com.*.PasswordView>

完整代码

一些样式，我设置了，结果直接没用上

<declare-styleable name="PasswordView"> <!-- 密码的个数 --> <attr name="passwordNumber" format="integer"/> <!-- 密码圆点的半径 --> <attr name="passwordRadius" format="dimension"/> <!-- 密码圆点的颜色 --> <attr name="passwordColor" format="color"/> <!-- 外圈颜色 --> <attr name="outRingColor" format="color"/> <!-- 外圆线条大小 --> <attr name="outRingLineSize" format="color"/> <!-- 背景边框的颜色 --> <attr name="bgColor" format="color"/> <!-- 背景边框的大小 --> <attr name="bgSize" format="dimension"/> <!-- 背景边框的圆角大小 --> <attr name="bgCorner" format="dimension"/> </declare-styleable>

自定义Edittext

import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RectF;import android.util.AttributeSet;import android.util.TypedValue;import android.view.inputmethod.EditorInfo;import android.widget.EditText;/** *自定义密码输入框 */public class PasswordView extends EditText { // 画笔 private Paint mPaint; // 一个密码所占的宽度 private int mPasswordItemWidth; // 密码的个数默认为6位数 private int mPasswordNumber = 6; // 背景圆颜色 private int mBgColor = Color.parseColor("#d1d2d6"); // 背景大小 private int mBgSize = 1; // 背景边框圆角大小 private int mBgCorner = 0; // 外圆的颜色 private int outRingLineColor = mBgColor; // 外圆线条的大小 private int outRingLineSize = 1; // 密码输入的颜色 private int mPasswordColor = Color.parseColor("#cb3435"); // 密码圆点的半径大小 private int mPasswordRadius = 6; // 外圆半径大小 private int mOutRadius = 25; public PasswordView(Context context) { this(context, null); } public PasswordView(Context context, AttributeSet attrs) { super(context, attrs); initPaint(); initAttributeSet(context, attrs); // 设置输入模式是密码 setInputType(EditorInfo.TYPE_TEXT_VARIATION_PASSWORD); // 不显示光标 setCursorVisible(false); } /** * 初始化属性 */ private void initAttributeSet(Context context, AttributeSet attrs) { TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.PasswordView); // 获取大小 outRingLineSize = (int) array.getDimension(R.styleable.PasswordView_outRingLineSize, dip2px(outRingLineSize)); mPasswordRadius = (int) array.getDimension(R.styleable.PasswordView_passwordRadius, dip2px(mPasswordRadius)); mBgSize = (int) array.getDimension(R.styleable.PasswordView_bgSize, dip2px(mBgSize)); mBgCorner = (int) array.getDimension(R.styleable.PasswordView_bgCorner, 0); // 获取颜色 mBgColor = array.getColor(R.styleable.PasswordView_bgColor, mBgColor); outRingLineColor = array.getColor(R.styleable.PasswordView_outRingColor, outRingLineColor); mPasswordColor = array.getColor(R.styleable.PasswordView_passwordColor, mPasswordColor); array.recycle(); } /** * 初始化画笔 */ private void initPaint() { mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setDither(true); } /** * dip 转 px */ private int dip2px(int dip) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dip, getResources().getDisplayMetrics()); } @Override protected void onDraw(Canvas canvas) { int passwordWidth = getWidth() - (mPasswordNumber - 1) * outRingLineSize; mPasswordItemWidth = passwordWidth / mPasswordNumber; // 绘制背景外圆 drawOutRing(canvas); // 绘制背景内圆 drawInRing(canvas); // 绘制密码 drawHidePassword(canvas); } @Override public void setText(CharSequence text, BufferType type) { super.setText(text, type); } /** * 绘制背景外圆 */ private void drawOutRing(Canvas canvas) { mPaint.setColor(mBgColor); // 设置画笔为空心 mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeWidth(mBgSize); RectF rectF = new RectF(mBgSize, mBgSize, getWidth() - mBgSize, getHeight() - mBgSize); // 画圆 for (int i = 0; i < mPasswordNumber; i++) { int cx = i * outRingLineSize + i * mPasswordItemWidth + mPasswordItemWidth / 2 + mBgSize; canvas.drawCircle(cx, getHeight() / 2, mOutRadius, mPaint); } } /** * 绘制隐藏的密码 */ private void drawHidePassword(Canvas canvas) { int passwordLength = getText().length(); if (passwordLength > 6) passwordLength = 6; mPaint.setColor(mPasswordColor); // 设置画笔为实心 mPaint.setStyle(Paint.Style.FILL); for (int i = 0; i < passwordLength; i++) { int cx = i * outRingLineSize + i * mPasswordItemWidth + mPasswordItemWidth / 2 + mBgSize; canvas.drawCircle(cx, getHeight() / 2, mPasswordRadius, mPaint); } //外圆 mPaint.setColor(mPasswordColor); // 设置画笔为空心 mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeWidth(mBgSize); RectF rectF = new RectF(mBgSize, mBgSize, getWidth() - mBgSize, getHeight() - mBgSize); // 如果没有设置圆角，就画矩形 for (int i = 0; i < passwordLength; i++) { int cx = i * outRingLineSize + i * mPasswordItemWidth + mPasswordItemWidth / 2 + mBgSize; canvas.drawCircle(cx, getHeight() / 2, mOutRadius, mPaint); } } /** * 绘制背景内圆 */ private void drawInRing(Canvas canvas) { mPaint.setColor(outRingLineColor); // 设置画笔为实心 mPaint.setStyle(Paint.Style.FILL); // 画圈圈 for (int i = 0; i < mPasswordNumber; i++) { int cx = i * outRingLineSize + i * mPasswordItemWidth + mPasswordItemWidth / 2 + mBgSize; canvas.drawCircle(cx, getHeight() / 2, mPasswordRadius, mPaint); } }}

总结

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