这篇文章给大家介绍Android中怎么自定义一个密码输入框，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。
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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
6.还可以设置些属性
在sytle中设置，通过xml中的app：xxx引用。
完整代码
一些样式，我设置了，结果直接没用上
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);
}
}
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