Java tutorial
/* * Copyright (C) 2013 The Android Open Source Project * * 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 * * http://www.apache.org/licenses/LICENSE-2.0 * * 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.codetroopers.betterpickers.radialtimepicker; import android.content.Context; import android.content.res.Resources; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Paint.Align; import android.graphics.Typeface; import android.support.v4.content.ContextCompat; import android.util.Log; import android.view.View; import com.codetroopers.betterpickers.R; import java.text.DateFormatSymbols; /** * Draw the two smaller AM and PM circles next to where the larger circle will be. */ public class AmPmCirclesView extends View { private static final String TAG = "AmPmCirclesView"; private final Paint mPaint = new Paint(); private int mSelectedAlpha; private int mUnselectedAlpha; private int mUnselectedColor; private int mAmPmTextColor; private int mSelectedColor; private float mCircleRadiusMultiplier; private float mAmPmCircleRadiusMultiplier; private String mAmText; private String mPmText; private boolean mIsInitialized; private static final int AM = RadialTimePickerDialogFragment.AM; private static final int PM = RadialTimePickerDialogFragment.PM; private boolean mDrawValuesReady; private int mAmPmCircleRadius; private int mAmXCenter; private int mPmXCenter; private int mAmPmYCenter; private int mAmOrPm; private int mAmOrPmPressed; public AmPmCirclesView(Context context) { super(context); mIsInitialized = false; } public void initialize(Context context, int amOrPm) { if (mIsInitialized) { Log.e(TAG, "AmPmCirclesView may only be initialized once."); return; } Resources res = context.getResources(); mUnselectedColor = res.getColor(R.color.bpWhite); mSelectedColor = res.getColor(R.color.bpBlue); mAmPmTextColor = res.getColor(R.color.ampm_text_color); String typefaceFamily = res.getString(R.string.sans_serif); Typeface tf = Typeface.create(typefaceFamily, Typeface.NORMAL); mPaint.setTypeface(tf); mPaint.setAntiAlias(true); mPaint.setTextAlign(Align.CENTER); mCircleRadiusMultiplier = Float.parseFloat(res.getString(R.string.circle_radius_multiplier)); mAmPmCircleRadiusMultiplier = Float.parseFloat(res.getString(R.string.ampm_circle_radius_multiplier)); String[] amPmTexts = new DateFormatSymbols().getAmPmStrings(); mAmText = amPmTexts[0]; mPmText = amPmTexts[1]; setAmOrPm(amOrPm); mAmOrPmPressed = -1; mIsInitialized = true; } /* package */ void setTheme(TypedArray themeColors) { mUnselectedColor = themeColors.getColor(R.styleable.BetterPickersDialogs_bpAmPmCircleColor, ContextCompat.getColor(getContext(), R.color.bpBlue)); mSelectedColor = themeColors.getColor(R.styleable.BetterPickersDialogs_bpAmPmCircleColor, ContextCompat.getColor(getContext(), R.color.bpBlue)); mAmPmTextColor = themeColors.getColor(R.styleable.BetterPickersDialogs_bpAmPmTextColor, ContextCompat.getColor(getContext(), R.color.bpWhite)); mSelectedAlpha = 200; mUnselectedAlpha = 50; } public void setAmOrPm(int amOrPm) { mAmOrPm = amOrPm; } public void setAmOrPmPressed(int amOrPmPressed) { mAmOrPmPressed = amOrPmPressed; } /** * Calculate whether the coordinates are touching the AM or PM circle. */ public int getIsTouchingAmOrPm(float xCoord, float yCoord) { if (!mDrawValuesReady) { return -1; } int squaredYDistance = (int) ((yCoord - mAmPmYCenter) * (yCoord - mAmPmYCenter)); int distanceToAmCenter = (int) Math.sqrt((xCoord - mAmXCenter) * (xCoord - mAmXCenter) + squaredYDistance); if (distanceToAmCenter <= mAmPmCircleRadius) { return AM; } int distanceToPmCenter = (int) Math.sqrt((xCoord - mPmXCenter) * (xCoord - mPmXCenter) + squaredYDistance); if (distanceToPmCenter <= mAmPmCircleRadius) { return PM; } // Neither was close enough. return -1; } @Override public void onDraw(Canvas canvas) { int viewWidth = getWidth(); if (viewWidth == 0 || !mIsInitialized) { return; } if (!mDrawValuesReady) { int layoutXCenter = getWidth() / 2; int layoutYCenter = getHeight() / 2; int circleRadius = (int) (Math.min(layoutXCenter, layoutYCenter) * mCircleRadiusMultiplier); mAmPmCircleRadius = (int) (circleRadius * mAmPmCircleRadiusMultiplier); int textSize = mAmPmCircleRadius * 3 / 4; mPaint.setTextSize(textSize); // Line up the vertical center of the AM/PM circles with the bottom of the main circle. mAmPmYCenter = layoutYCenter - mAmPmCircleRadius / 2 + circleRadius; // Line up the horizontal edges of the AM/PM circles with the horizontal edges // of the main circle. mAmXCenter = layoutXCenter - circleRadius + mAmPmCircleRadius; mPmXCenter = layoutXCenter + circleRadius - mAmPmCircleRadius; mDrawValuesReady = true; } // We'll need to draw either a lighter blue (for selection), a darker blue (for touching) // or white (for not selected). int amColor = mUnselectedColor; int amAlpha = mUnselectedAlpha; int pmColor = mUnselectedColor; int pmAlpha = mUnselectedAlpha; if (mAmOrPm == AM) { amColor = mSelectedColor; amAlpha = mSelectedAlpha; } else if (mAmOrPm == PM) { pmColor = mSelectedColor; pmAlpha = mSelectedAlpha; } if (mAmOrPmPressed == AM) { amColor = mSelectedColor; amAlpha = mSelectedAlpha; } else if (mAmOrPmPressed == PM) { pmColor = mSelectedColor; pmAlpha = mSelectedAlpha; } // Draw the two circles. mPaint.setColor(amColor); mPaint.setAlpha(amAlpha); canvas.drawCircle(mAmXCenter, mAmPmYCenter, mAmPmCircleRadius, mPaint); mPaint.setColor(pmColor); mPaint.setAlpha(pmAlpha); canvas.drawCircle(mPmXCenter, mAmPmYCenter, mAmPmCircleRadius, mPaint); // Draw the AM/PM texts on top. mPaint.setColor(mAmPmTextColor); int textYCenter = mAmPmYCenter - (int) (mPaint.descent() + mPaint.ascent()) / 2; canvas.drawText(mAmText, mAmXCenter, textYCenter, mPaint); canvas.drawText(mPmText, mPmXCenter, textYCenter, mPaint); } }