Java tutorial
/** * Copyright 2016 Ali Muzaffar * <p/> * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * <p/> * http://www.apache.org/licenses/LICENSE-2.0 * <p/> * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.alimuzaffar.lib.widgets; import android.animation.Animator; import android.animation.AnimatorSet; import android.animation.ValueAnimator; import android.annotation.TargetApi; import android.content.Context; import android.content.res.ColorStateList; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Rect; import android.graphics.RectF; import android.graphics.drawable.Drawable; import android.os.Build; import android.support.v4.content.ContextCompat; import android.text.InputType; import android.text.TextUtils; import android.util.AttributeSet; import android.util.TypedValue; import android.view.ActionMode; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.animation.OvershootInterpolator; import android.view.inputmethod.InputMethodManager; import android.widget.EditText; public class PinEntryEditText extends EditText { public static final String XML_NAMESPACE_ANDROID = "http://schemas.android.com/apk/res/android"; private String mMask = null; private StringBuilder mMaskChars = null; private int mAnimatedType = 0; private float mSpace = 24; //24 dp by default, space between the lines private float mCharSize; private float mNumChars = 4; private float mTextBottomPadding = 8; //8dp by default, height of the text from our lines private int mMaxLength = 4; private RectF[] mLineCoords; private float[] mCharBottom; private Paint mCharPaint; private Paint mLastCharPaint; private Drawable mPinBackground; private Rect mTextHeight = new Rect(); private boolean mIsDigitSquare = false; private OnClickListener mClickListener; private OnPinEnteredListener mOnPinEnteredListener = null; private float mLineStroke = 1; //1dp by default private float mLineStrokeSelected = 2; //2dp by default private Paint mLinesPaint; private boolean mAnimate = false; private boolean mHasError = false; private ColorStateList mOriginalTextColors; int[][] mStates = new int[][] { new int[] { android.R.attr.state_selected }, // selected new int[] { android.R.attr.state_active }, // error new int[] { android.R.attr.state_focused }, // focused new int[] { -android.R.attr.state_focused }, // unfocused }; int[] mColors = new int[] { Color.GREEN, Color.RED, Color.BLACK, Color.GRAY }; ColorStateList mColorStates = new ColorStateList(mStates, mColors); public PinEntryEditText(Context context) { super(context); } public PinEntryEditText(Context context, AttributeSet attrs) { super(context, attrs); init(context, attrs); } public PinEntryEditText(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context, attrs); } @TargetApi(Build.VERSION_CODES.LOLLIPOP) public PinEntryEditText(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); init(context, attrs); } private void init(Context context, AttributeSet attrs) { float multi = context.getResources().getDisplayMetrics().density; mLineStroke = multi * mLineStroke; mLineStrokeSelected = multi * mLineStrokeSelected; mSpace = multi * mSpace; //convert to pixels for our density mTextBottomPadding = multi * mTextBottomPadding; //convert to pixels for our density TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.PinEntryEditText, 0, 0); try { TypedValue outValue = new TypedValue(); ta.getValue(R.styleable.PinEntryEditText_pinAnimationType, outValue); mAnimatedType = outValue.data; mMask = ta.getString(R.styleable.PinEntryEditText_pinCharacterMask); mLineStroke = ta.getDimension(R.styleable.PinEntryEditText_pinLineStroke, mLineStroke); mLineStrokeSelected = ta.getDimension(R.styleable.PinEntryEditText_pinLineStrokeSelected, mLineStrokeSelected); mSpace = ta.getDimension(R.styleable.PinEntryEditText_pinCharacterSpacing, mSpace); mTextBottomPadding = ta.getDimension(R.styleable.PinEntryEditText_pinTextBottomPadding, mTextBottomPadding); mIsDigitSquare = ta.getBoolean(R.styleable.PinEntryEditText_pinBackgroundIsSquare, mIsDigitSquare); mPinBackground = ta.getDrawable(R.styleable.PinEntryEditText_pinBackgroundDrawable); ColorStateList colors = ta.getColorStateList(R.styleable.PinEntryEditText_pinLineColors); if (colors != null) { mColorStates = colors; } } finally { ta.recycle(); } mCharPaint = new Paint(getPaint()); mLastCharPaint = new Paint(getPaint()); mLinesPaint = new Paint(getPaint()); mLinesPaint.setStrokeWidth(mLineStroke); TypedValue outValue = new TypedValue(); context.getTheme().resolveAttribute(R.attr.colorControlActivated, outValue, true); int colorSelected = outValue.data; mColors[0] = colorSelected; int colorFocused = isInEditMode() ? Color.GRAY : ContextCompat.getColor(context, R.color.pin_normal); mColors[1] = colorFocused; int colorUnfocused = isInEditMode() ? Color.GRAY : ContextCompat.getColor(context, R.color.pin_normal); mColors[2] = colorUnfocused; setBackgroundResource(0); mMaxLength = attrs.getAttributeIntValue(XML_NAMESPACE_ANDROID, "maxLength", 4); mNumChars = mMaxLength; //Disable copy paste super.setCustomSelectionActionModeCallback(new ActionMode.Callback() { public boolean onPrepareActionMode(ActionMode mode, Menu menu) { return false; } public void onDestroyActionMode(ActionMode mode) { } public boolean onCreateActionMode(ActionMode mode, Menu menu) { return false; } public boolean onActionItemClicked(ActionMode mode, MenuItem item) { return false; } }); // When tapped, move cursor to end of text. super.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { setSelection(getText().length()); if (mClickListener != null) { mClickListener.onClick(v); } } }); super.setOnLongClickListener(new OnLongClickListener() { @Override public boolean onLongClick(View v) { setSelection(getText().length()); return true; } }); //If input type is password and no mask is set, use a default mask if ((getInputType() & InputType.TYPE_TEXT_VARIATION_PASSWORD) == InputType.TYPE_TEXT_VARIATION_PASSWORD && TextUtils.isEmpty(mMask)) { mMask = "\u25CF"; } else if ((getInputType() & InputType.TYPE_NUMBER_VARIATION_PASSWORD) == InputType.TYPE_NUMBER_VARIATION_PASSWORD && TextUtils.isEmpty(mMask)) { mMask = "\u25CF"; } if (!TextUtils.isEmpty(mMask)) { mMaskChars = getMaskChars(); } //Height of the characters, used if there is a background drawable getPaint().getTextBounds("|", 0, 1, mTextHeight); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); mOriginalTextColors = getTextColors(); if (mOriginalTextColors != null) { mLastCharPaint.setColor(mOriginalTextColors.getDefaultColor()); mCharPaint.setColor(mOriginalTextColors.getDefaultColor()); } int availableWidth = getWidth() - getPaddingRight() - getPaddingLeft(); if (mSpace < 0) { mCharSize = (availableWidth / (mNumChars * 2 - 1)); } else { mCharSize = (availableWidth - (mSpace * (mNumChars - 1))) / mNumChars; } mLineCoords = new RectF[(int) mNumChars]; mCharBottom = new float[(int) mNumChars]; int startX = getPaddingLeft(); int bottom = getHeight() - getPaddingBottom(); for (int i = 0; i < mNumChars; i++) { mLineCoords[i] = new RectF(startX, bottom, startX + mCharSize, bottom); if (mPinBackground != null) { if (mIsDigitSquare) { mLineCoords[i].top = getPaddingTop(); mLineCoords[i].right = startX + mLineCoords[i].height(); } else { mLineCoords[i].top -= mTextHeight.height() + mTextBottomPadding * 2; } } if (mSpace < 0) { startX += mCharSize * 2; } else { startX += mCharSize + mSpace; } mCharBottom[i] = mLineCoords[i].bottom - mTextBottomPadding; } } @Override public void setOnClickListener(OnClickListener l) { mClickListener = l; } @Override public void setCustomSelectionActionModeCallback(ActionMode.Callback actionModeCallback) { throw new RuntimeException("setCustomSelectionActionModeCallback() not supported."); } @Override protected void onDraw(Canvas canvas) { //super.onDraw(canvas); CharSequence text = getFullText(); int textLength = text.length(); float[] textWidths = new float[textLength]; getPaint().getTextWidths(text, 0, textLength, textWidths); for (int i = 0; i < mNumChars; i++) { //If a background for the pin characters is specified, it should be behind the characters. if (mPinBackground != null) { updateDrawableState(i < textLength, i == textLength); mPinBackground.setBounds((int) mLineCoords[i].left, (int) mLineCoords[i].top, (int) mLineCoords[i].right, (int) mLineCoords[i].bottom); mPinBackground.draw(canvas); } if (textLength > i) { float middle = mLineCoords[i].left + mCharSize / 2; if (!mAnimate || i != textLength - 1) { canvas.drawText(text, i, i + 1, middle - textWidths[i] / 2, mCharBottom[i], mCharPaint); } else { canvas.drawText(text, i, i + 1, middle - textWidths[i] / 2, mCharBottom[i], mLastCharPaint); } } //The lines should be in front of the text (because that's how I want it). if (mPinBackground == null) { updateColorForLines(i <= textLength); canvas.drawLine(mLineCoords[i].left, mLineCoords[i].top, mLineCoords[i].right, mLineCoords[i].bottom, mLinesPaint); } } } private CharSequence getFullText() { if (mMask == null) { return getText(); } else { return getMaskChars(); } } private StringBuilder getMaskChars() { if (mMaskChars == null) { mMaskChars = new StringBuilder(); } int textLength = getText().length(); while (mMaskChars.length() != textLength) { if (mMaskChars.length() < textLength) { mMaskChars.append(mMask); } else { mMaskChars.deleteCharAt(mMaskChars.length() - 1); } } return mMaskChars; } private int getColorForState(int... states) { return mColorStates.getColorForState(states, Color.GRAY); } /** * @param hasTextOrIsNext Is the color for a character that has been typed or is * the next character to be typed? */ private void updateColorForLines(boolean hasTextOrIsNext) { if (mHasError) { mLinesPaint.setColor(getColorForState(android.R.attr.state_active)); } else if (isFocused()) { mLinesPaint.setStrokeWidth(mLineStrokeSelected); mLinesPaint.setColor(getColorForState(android.R.attr.state_focused)); if (hasTextOrIsNext) { mLinesPaint.setColor(getColorForState(android.R.attr.state_selected)); } } else { mLinesPaint.setStrokeWidth(mLineStroke); mLinesPaint.setColor(getColorForState(-android.R.attr.state_focused)); } } private void updateDrawableState(boolean hasText, boolean isNext) { if (mHasError) { mPinBackground.setState(new int[] { android.R.attr.state_active }); } else if (isFocused()) { mPinBackground.setState(new int[] { android.R.attr.state_focused }); if (isNext) { mPinBackground.setState(new int[] { android.R.attr.state_focused, android.R.attr.state_selected }); } else if (hasText) { mPinBackground.setState(new int[] { android.R.attr.state_focused, android.R.attr.state_checked }); } } else { mPinBackground.setState(new int[] { -android.R.attr.state_focused }); } } public void setError(boolean hasError) { mHasError = hasError; } public boolean isError() { return mHasError; } public void focus() { requestFocus(); // Show keyboard InputMethodManager inputMethodManager = (InputMethodManager) getContext() .getSystemService(Context.INPUT_METHOD_SERVICE); inputMethodManager.showSoftInput(this, 0); } @Override protected void onTextChanged(CharSequence text, final int start, int lengthBefore, final int lengthAfter) { setError(false); if (mLineCoords == null || !mAnimate) { if (mOnPinEnteredListener != null && text.length() == mMaxLength) { mOnPinEnteredListener.onPinEntered(text); } return; } if (mAnimatedType == -1) { invalidate(); return; } if (lengthAfter > lengthBefore) { if (mAnimatedType == 0) { animatePopIn(); } else { animateBottomUp(text, start); } } } private void animatePopIn() { ValueAnimator va = ValueAnimator.ofFloat(1, getPaint().getTextSize()); va.setDuration(200); va.setInterpolator(new OvershootInterpolator()); va.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { mLastCharPaint.setTextSize((Float) animation.getAnimatedValue()); PinEntryEditText.this.invalidate(); } }); if (getText().length() == mMaxLength && mOnPinEnteredListener != null) { va.addListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) { } @Override public void onAnimationEnd(Animator animation) { mOnPinEnteredListener.onPinEntered(getText()); } @Override public void onAnimationCancel(Animator animation) { } @Override public void onAnimationRepeat(Animator animation) { } }); } va.start(); } private void animateBottomUp(CharSequence text, final int start) { mCharBottom[start] = mLineCoords[start].bottom - mTextBottomPadding; ValueAnimator animUp = ValueAnimator.ofFloat(mCharBottom[start] + getPaint().getTextSize(), mCharBottom[start]); animUp.setDuration(300); animUp.setInterpolator(new OvershootInterpolator()); animUp.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { Float value = (Float) animation.getAnimatedValue(); mCharBottom[start] = value; PinEntryEditText.this.invalidate(); } }); mLastCharPaint.setAlpha(255); ValueAnimator animAlpha = ValueAnimator.ofInt(0, 255); animAlpha.setDuration(300); animAlpha.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator animation) { Integer value = (Integer) animation.getAnimatedValue(); mLastCharPaint.setAlpha(value); } }); AnimatorSet set = new AnimatorSet(); if (text.length() == mMaxLength && mOnPinEnteredListener != null) { set.addListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) { } @Override public void onAnimationEnd(Animator animation) { mOnPinEnteredListener.onPinEntered(getText()); } @Override public void onAnimationCancel(Animator animation) { } @Override public void onAnimationRepeat(Animator animation) { } }); } set.playTogether(animUp, animAlpha); set.start(); } public void setAnimateText(boolean animate) { mAnimate = animate; } public void setOnPinEnteredListener(OnPinEnteredListener l) { mOnPinEnteredListener = l; } public interface OnPinEnteredListener { void onPinEntered(CharSequence str); } }