先看最终效果图
可在布局文件中配置各种属性，如密码框个数，密码框圆角半径，颜色，中间圆半径和大小，padding值也有效。
image.png
完整代码如下（有注释）：
public class PwdInput extends View implements View.OnKeyListener {
private static final String TAG = PwdInput.class.getSimpleName();
private static final int DEFAULT_PWD_LENGTH = 6;
private int mPwdLength;
private int itemWidth;
private int itemHeight;
private Paint mPaint;
private RectF mRectF;
private InputMethodManager inputMethodManager;
private ArrayList<String> mPasswords;
private TextPaint mTextPaint;
private ArrayList<String> mNeedHidden = new ArrayList<>();
private OnInputFinished onInputFinished;
private Paint circlePaint;
private Handler mHandler = new Handler() {
@Override
public void dispatchMessage(Message msg) {
super.dispatchMessage(msg);
if (msg.what == 100) {
mNeedHidden.add((String) msg.obj);
invalidate();
}
}
};
private float textSize;
private int itemBorderColor;
private int itemCircleColor;
private Rect textRect;
private float mRadius;
private float roundRectRaidus;
private float mStrokeWidth;
public void setOnInputFinished(OnInputFinished onInputFinished) {
this.onInputFinished = onInputFinished;
}
public PwdInput(Context context) {
this(context, null);
}
public PwdInput(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public PwdInput(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.PwdInput);
//密码长度
mPwdLength = array.getInteger(R.styleable.PwdInput_pwd_length, DEFAULT_PWD_LENGTH);
//输入框文字大小
textSize = array.getDimension(R.styleable.PwdInput_pwd_textsize, dp2px(15));
//密码框颜色
itemBorderColor = array.getColor(R.styleable.PwdInput_pwd_item_border_color, Color.BLACK);
//圆点颜色
itemCircleColor = array.getColor(R.styleable.PwdInput_pwd_circle_color, Color.MAGENTA);
//圆点半径
mRadius = array.getDimension(R.styleable.PwdInput_pwd_circle_radius, dp2px(10));
//密码框圆角半径
roundRectRaidus = array.getDimension(R.styleable.PwdInput_pwd_round_rect_radius, dp2px(4));
mStrokeWidth=array.getDimension(R.styleable.PwdInput_pwd_round_rect_border_width,dp2px(0.5f));
array.recycle();
init();
}
private void init() {
//键盘输入监听
setOnKeyListener(this);
//获取焦点
setFocusable(true);
setFocusableInTouchMode(true);
requestFocus();
//键盘管理
inputMethodManager = (InputMethodManager) getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
//密码框 paint
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setColor(itemBorderColor);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeWidth(mStrokeWidth);
//设置阴影效果
mPaint.setShadowLayer(3, 3, 3, Color.GRAY);
setLayerType(LAYER_TYPE_SOFTWARE, null);
//密码框rect
mRectF = new RectF();
//存放密码集合
mPasswords = new ArrayList<>();
//密码明文paint
mTextPaint = new TextPaint(TextPaint.ANTI_ALIAS_FLAG);
mTextPaint.setTextSize(textSize);
//密码暗文paint
circlePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
circlePaint.setColor(itemCircleColor);
//测量文字所需rect
textRect = new Rect();
//密码框宽高 默认宽高一样
itemWidth = getMaxItemWidth();
itemHeight = getMaxItemWidth();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
Log.d(TAG, "onMeasure: " + getPaddingBottom());
//整体宽度等于密码框宽度和密码框之间间隙总和再加上padding大小
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightMode = MeasureSpec.getMode(heightMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
int width, height;
if (widthMode != MeasureSpec.EXACTLY) {//宽度未知
//宽度未知时
//密码框之间的间隙等于密码框大小的1/5
width = itemWidth * mPwdLength + (mPwdLength - 1) * itemWidth / 5 + getPaddingLeft() + getPaddingRight();
if (heightMode == MeasureSpec.EXACTLY) {//高度已知
itemHeight = heightSize - getPaddingTop() - getPaddingBottom();
height = heightSize;
} else {//高度未知
height = itemHeight + getPaddingTop() + getPaddingBottom();
}
} else {//宽度已知
itemWidth = (widthSize - getPaddingLeft() - getPaddingRight()) * 5 / (mPwdLength * 6 - 1);
width = widthSize;
if (heightMode == MeasureSpec.EXACTLY) {//高度已知
itemHeight = heightSize - getPaddingTop() - getPaddingBottom();
height = heightSize;
} else {//高度未知
height = itemHeight + getPaddingBottom() + getPaddingTop();
}
}
setMeasuredDimension(width, height);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Log.d(TAG, "onDraw: ");
//绘制圆角矩形
for (int i = 0; i < mPwdLength; i++) {
mRectF.left = i * (itemWidth + itemWidth / 5) + getPaddingLeft() + mStrokeWidth / 2;
mRectF.top = getPaddingTop() + mStrokeWidth / 2;
mRectF.right = mRectF.left + itemWidth - mStrokeWidth;
mRectF.bottom = mRectF.top + itemHeight - mStrokeWidth;
canvas.drawRoundRect(mRectF, roundRectRaidus, roundRectRaidus, mPaint);
}
//绘制文字
for (int i = 0; i < mPasswords.size(); i++) {
String text = mPasswords.get(i);
textRect.setEmpty();
//测量文字宽高
mTextPaint.getTextBounds(text, 0, text.length(), textRect);
//绘制文字坐标
float textX = i * itemWidth / 5.0f + (i * 2 + 1) * itemWidth / 2.0f + getPaddingLeft() - textRect.width() / 2.0f;
float textY = getPaddingTop() + itemHeight / 2.0f + textRect.height() / 2.0f;
canvas.drawText(text, textX, textY, mTextPaint);
}
//绘制圆点
for (int i = 0; i < mNeedHidden.size(); i++) {
//圆心坐标
float cx = i * itemWidth / 5.0f + (i * 2 + 1) * itemWidth / 2.0f + getPaddingLeft();
float cy = itemHeight / 2.0f + getPaddingTop() ;
canvas.drawCircle(cx, cy, mRadius, circlePaint);
}
}
//dp px 换算
private float dp2px(float dp) {
return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, getResources().getDisplayMetrics());
}
//获取密码框最大宽高
private int getMaxItemWidth() {
return ((getResources().getDisplayMetrics().widthPixels - getPaddingRight() - getPaddingLeft()) * 5) / (mPwdLength * 6 - 1);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
Log.d(TAG, "onTouchEvent: ");
requestFocus();
inputMethodManager.showSoftInput(this, InputMethodManager.SHOW_FORCED);
return true;
}
return super.onTouchEvent(event);
}
@Override
public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
outAttrs.inputType = InputType.TYPE_CLASS_NUMBER;
outAttrs.imeOptions = EditorInfo.IME_ACTION_DONE;
return new BaseInputConnection(this, false);
}
@Override
public boolean onCheckIsTextEditor() {
return true;
}
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (KeyEvent.ACTION_DOWN != event.getAction()) {
return false;
}
if (event.isShiftPressed()) {
return false;
}
//只能输入数字
if (keyCode >= KeyEvent.KEYCODE_0 && keyCode <= KeyEvent.KEYCODE_9) {
if (mPasswords.size() < mPwdLength) {
Log.d(TAG, "onKey: add");
mPasswords.add(String.valueOf(keyCode - 7));
confirmFinshed();
Message message = Message.obtain();
message.what = 100;
message.obj = String.valueOf(keyCode - 7);
mHandler.sendMessageDelayed(message, 250);
invalidate();
}
return true;
}
//删除键
if (keyCode == KeyEvent.KEYCODE_DEL) {
if (mPasswords.size() > 0) {
Log.d(TAG, "onKey: delete");
mPasswords.remove(mPasswords.size() - 1);
if (!mNeedHidden.isEmpty()) {
mNeedHidden.remove(mNeedHidden.size() - 1);
}
invalidate();
}
return true;
}
//确认
if (keyCode == KeyEvent.KEYCODE_ENTER) {
confirmFinshed();
return true;
}
return false;
}
//获取密码
private String getPwd() {
StringBuilder sb = new StringBuilder();
for (String p : mPasswords) {
sb.append(p);
}
return sb.toString();
}
//密码输入完成 隐藏键盘
private void confirmFinshed() {
if (mPasswords.size() == mPwdLength) {
inputMethodManager.hideSoftInputFromWindow(getWindowToken(), 0);
if (onInputFinished != null) {
onInputFinished.onFinished(getPwd());
}
}
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
inputMethodManager.hideSoftInputFromWindow(getWindowToken(), 0);
}
//对外输出密码
interface OnInputFinished {
void onFinished(String pwd);
}
}
2.使用的自定义属性如下：
<declare-styleable name="PwdInput">
<attr name="pwd_length" format="integer"/>
<attr name="pwd_textsize" format="dimension"/>
<attr name="pwd_item_border_color" format="color"/>
<attr name="pwd_circle_color" format="color"/>
<attr name="pwd_circle_radius" format="dimension"/>
<attr name="pwd_round_rect_radius" format="dimension"/>
<attr name="pwd_round_rect_border_width" format="dimension"/>
</declare-styleable>
3.截图对应的布局文件如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.xxx.pwdedittextdemo.MainActivity">
<com.example.xxx.pwdedittextdemo.PwdInput
android:id="@+id/pwdedittext"
android:layout_marginTop="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<com.example.xxx.pwdedittextdemo.PwdInput
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
app:pwd_circle_color="#ff8100"
app:pwd_circle_radius="10dp"
app:pwd_item_border_color="#666"
app:pwd_length="8"
app:pwd_round_rect_radius="8dp"
app:pwd_textsize="17sp" />
<com.example.xxx.pwdedittextdemo.PwdInput
android:layout_marginTop="10dp"
android:layout_width="250dp"
android:layout_height="80dp"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:paddingTop="5dp"
android:background="#dedede"
/>
<com.example.xxx.pwdedittextdemo.PwdInput
android:layout_marginTop="10dp"
android:layout_width="wrap_content"
android:layout_height="80dp"
android:paddingLeft="20dp"
android:paddingRight="10dp" />
<com.example.xxx.pwdedittextdemo.PwdInput
android:layout_marginTop="10dp"
android:layout_width="wrap_content"
android:layout_height="80dp"
android:paddingTop="20dp" />
</LinearLayout>
4.获取密码
PwdInput pwdEditText= (PwdInput) findViewById(R.id.pwdedittext);
pwdEditText.setOnInputFinished(new PwdInput.OnInputFinished() {
@Override
public void onFinished(String pwd) {
Log.d("xxxxxx", "onFinished: "+pwd);
Toast.makeText(MainActivity.this, "密码是："+pwd, Toast.LENGTH_SHORT).show();
}
});
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