Java tutorial
/* * Copyright 2013 Google Inc. * * 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. * * You can find source here: * https://code.google.com/p/dashclock/source/browse/main/src/main/java/com/google/android/apps/dashclock/configuration/ColorPreference.java */ package com.fast.access.kam.widget.colorpicker.dashclockpicker; import android.app.Activity; import android.app.Dialog; import android.content.Context; import android.content.res.Resources; import android.content.res.TypedArray; import android.graphics.Color; import android.graphics.drawable.Drawable; import android.graphics.drawable.GradientDrawable; import android.os.Bundle; import android.preference.Preference; import android.support.v4.app.DialogFragment; import android.support.v7.app.AlertDialog; import android.support.v7.app.AppCompatActivity; import android.util.AttributeSet; import android.util.TypedValue; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.GridView; import android.widget.ImageView; import android.widget.TextView; import com.fast.access.kam.R; import java.util.ArrayList; import java.util.List; /** * A preference that allows the user to choose an application or shortcut. */ public class ColorPreference extends Preference implements OnColorSelected { private int[] mColorChoices = {}; private int mValue = 0; private int mItemLayoutId = R.layout.dash_grid_item_color; private int mNumColumns = 5; private View mPreviewView; private ColorSelector colorSelector; public ColorPreference(Context context) { super(context); initAttrs(null, 0); } public ColorPreference(Context context, AttributeSet attrs) { super(context, attrs); initAttrs(attrs, 0); } public ColorPreference(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); initAttrs(attrs, defStyle); } private void initAttrs(AttributeSet attrs, int defStyle) { TypedArray a = getContext().getTheme().obtainStyledAttributes(attrs, R.styleable.ColorPreference, defStyle, defStyle); try { mItemLayoutId = a.getResourceId(R.styleable.ColorPreference_itemLayout, mItemLayoutId); mNumColumns = a.getInteger(R.styleable.ColorPreference_numColumns, mNumColumns); int choicesResId = a.getResourceId(R.styleable.ColorPreference_choices, R.array.default_color_choice_values); if (choicesResId > 0) { String[] choices = a.getResources().getStringArray(choicesResId); mColorChoices = new int[choices.length]; for (int i = 0; i < choices.length; i++) { mColorChoices[i] = Color.parseColor(choices[i]); } } } finally { a.recycle(); } setWidgetLayoutResource(mItemLayoutId); } @Override protected void onBindView(View view) { super.onBindView(view); mPreviewView = view.findViewById(R.id.color_view); setColorViewValue(mPreviewView, mValue); } public void setValue(int value) { if (callChangeListener(value)) { mValue = value; persistInt(value); notifyChanged(); } } @Override protected void onClick() { super.onClick(); ColorDialogFragment fragment = ColorDialogFragment.newInstance(); fragment.setSelector(colorSelector); fragment.setPreference(this); AppCompatActivity activity = (AppCompatActivity) getContext(); activity.getSupportFragmentManager().beginTransaction().add(fragment, getFragmentTag()).commit(); } @Override protected void onAttachedToActivity() { super.onAttachedToActivity(); AppCompatActivity activity = (AppCompatActivity) getContext(); ColorDialogFragment fragment = (ColorDialogFragment) activity.getSupportFragmentManager() .findFragmentByTag(getFragmentTag()); if (fragment != null) { // re-bind preference to fragment fragment.setPreference(this); } } @Override protected Object onGetDefaultValue(TypedArray a, int index) { return a.getInt(index, 0); } @Override protected void onSetInitialValue(boolean restoreValue, Object defaultValue) { setValue(restoreValue ? getPersistedInt(0) : (Integer) defaultValue); } public String getFragmentTag() { return "color_" + getKey(); } public int getValue() { return mValue; } @Override public void onColorSelect(ColorSelector colorSelector) { this.colorSelector = colorSelector; } public static class ColorDialogFragment extends DialogFragment { private ColorPreference mPreference; private ColorGridAdapter mAdapter; private GridView mColorGrid; private ColorSelector selector; public ColorDialogFragment() { } public static ColorDialogFragment newInstance() { return new ColorDialogFragment(); } public void setPreference(ColorPreference preference) { mPreference = preference; tryBindLists(); } @Override public void onAttach(Activity activity) { super.onAttach(activity); tryBindLists(); } @Override public Dialog onCreateDialog(Bundle savedInstanceState) { LayoutInflater layoutInflater = LayoutInflater.from(getActivity()); View rootView = layoutInflater.inflate(R.layout.dash_dialog_colors, null); mColorGrid = (GridView) rootView.findViewById(R.id.color_grid); mColorGrid.setNumColumns(mPreference.mNumColumns); mColorGrid.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> listView, View view, int position, long itemId) { mPreference.setValue(mAdapter.getItem(position)); selector.onColorSelected(mAdapter.getItem(position)); dismiss(); } }); tryBindLists(); return new AlertDialog.Builder(getActivity()).setView(rootView).create(); } private void tryBindLists() { if (mPreference == null) { return; } if (isAdded() && mAdapter == null) { mAdapter = new ColorGridAdapter(); } if (mAdapter != null && mColorGrid != null) { mAdapter.setSelectedColor(mPreference.getValue()); mColorGrid.setAdapter(mAdapter); } } public ColorSelector getSelector() { return selector; } public void setSelector(ColorSelector selector) { this.selector = selector; } private class ColorGridAdapter extends BaseAdapter { private List<Integer> mChoices = new ArrayList<Integer>(); private int mSelectedColor; private ColorGridAdapter() { for (int color : mPreference.mColorChoices) { mChoices.add(color); } } @Override public int getCount() { return mChoices.size(); } @Override public Integer getItem(int position) { return mChoices.get(position); } @Override public long getItemId(int position) { return mChoices.get(position); } @Override public View getView(int position, View convertView, ViewGroup container) { if (convertView == null) { convertView = LayoutInflater.from(getActivity()).inflate(mPreference.mItemLayoutId, container, false); } int color = getItem(position); setColorViewValue(convertView.findViewById(R.id.color_view), color); convertView.setBackgroundColor(color == mSelectedColor ? 0x6633b5e5 : 0); return convertView; } public void setSelectedColor(int selectedColor) { mSelectedColor = selectedColor; notifyDataSetChanged(); } } } private static void setColorViewValue(View view, int color) { if (view instanceof ImageView) { ImageView imageView = (ImageView) view; Resources res = imageView.getContext().getResources(); Drawable currentDrawable = imageView.getDrawable(); GradientDrawable colorChoiceDrawable; if (currentDrawable != null && currentDrawable instanceof GradientDrawable) { // Reuse drawable colorChoiceDrawable = (GradientDrawable) currentDrawable; } else { colorChoiceDrawable = new GradientDrawable(); colorChoiceDrawable.setShape(GradientDrawable.OVAL); } // Set stroke to dark version of color int darkenedColor = Color.rgb(Color.red(color) * 192 / 256, Color.green(color) * 192 / 256, Color.blue(color) * 192 / 256); colorChoiceDrawable.setColor(color); colorChoiceDrawable.setStroke( (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 1, res.getDisplayMetrics()), darkenedColor); imageView.setImageDrawable(colorChoiceDrawable); } else if (view instanceof TextView) { ((TextView) view).setTextColor(color); } } }