Java tutorial
/* * Copyright (C) 2015 GuDong <gudong.name@gmail.com> * * This file is part of GdTranslate * * GdTranslate is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * GdTranslate is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with GdTranslate. If not, see <http://www.gnu.org/licenses/>. * */ package com.yang.bruce.mumuxi.util; import android.app.Dialog; import android.content.Context; import android.content.DialogInterface; import android.graphics.Color; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v4.app.DialogFragment; import android.support.v7.app.AlertDialog; import android.support.v7.app.AppCompatActivity; import android.text.TextUtils; import android.view.InflateException; import android.view.LayoutInflater; import android.view.View; import android.webkit.JavascriptInterface; import android.webkit.WebSettings; import android.webkit.WebView; import com.yang.bruce.mumuxi.R; import java.io.BufferedReader; import java.io.InputStream; import java.io.InputStreamReader; public class WebDialog extends DialogFragment { private static final String KEY_UTF_8 = "UTF_8"; private DialogInterface.OnClickListener mNeutralClickCallback; private DialogInterface.OnClickListener mPositiveClickCallback; /** * create a custom dialog use web view load layout by html file * * @param dialogTitle dialog title * @param htmlFileName html file name * @param accentColor accent color * @return a instance of CustomWebViewDialog */ public static WebDialog create(String dialogTitle, String htmlFileName, int accentColor) { WebDialog dialog = new WebDialog(); Bundle args = new Bundle(); args.putString("dialogTitle", dialogTitle); args.putString("htmlFileName", htmlFileName); args.putInt("accentColor", accentColor); dialog.setArguments(args); return dialog; } /** * create a CustomWebViewDialog with a neutral button * * @param dialogTitle * @param htmlFileName * @param accentColor * @param neutralText neutral button text * @param neutralListener click listener * @return */ public static WebDialog create(String dialogTitle, String htmlFileName, int accentColor, String positiveText, DialogInterface.OnClickListener positiveListener, String neutralText, DialogInterface.OnClickListener neutralListener) { WebDialog dialog = new WebDialog(); Bundle args = new Bundle(); args.putString("dialogTitle", dialogTitle); args.putString("htmlFileName", htmlFileName); args.putInt("accentColor", accentColor); args.putString("positiveText", positiveText); dialog.setPositiveClickCallback(positiveListener); args.putString("neutralText", neutralText); dialog.setNeutralClickCallback(neutralListener); dialog.setArguments(args); return dialog; } @NonNull @Override public Dialog onCreateDialog(Bundle savedInstanceState) { final View customView; try { customView = LayoutInflater.from(getActivity()).inflate(R.layout.layout_about_dialog, null); } catch (InflateException e) { throw new IllegalStateException("This device does not support Web Views."); } String dialogTitle = getArguments().getString("dialogTitle"); String neutralText = getArguments().getString("neutralText"); String positiveText = getArguments().getString("positiveText"); neutralText = TextUtils.isEmpty(neutralText) ? "" : neutralText; positiveText = TextUtils.isEmpty(neutralText) ? getString(android.R.string.ok) : positiveText; AlertDialog dialog = new AlertDialog.Builder(getActivity()).setTitle(dialogTitle).setView(customView) .setNeutralButton(neutralText, mNeutralClickCallback) .setPositiveButton(positiveText, mPositiveClickCallback).show(); final WebView webView = (WebView) customView.findViewById(R.id.webview); setWebView(webView, customView.getContext()); try { String htmlFileName = getArguments().getString("htmlFileName"); StringBuilder buf = new StringBuilder(); InputStream json = getActivity().getAssets().open(htmlFileName); BufferedReader in = new BufferedReader(new InputStreamReader(json, "UTF-8")); String str; while ((str = in.readLine()) != null) buf.append(str); in.close(); final int accentColor = getArguments().getInt("accentColor"); String formatLodString = buf.toString() .replace("{style-placeholder}", "body { background-color: #ffffff; color: #000; }") .replace("{link-color}", colorToHex(shiftColor(accentColor, true))) .replace("{link-color-active}", colorToHex(accentColor)); webView.loadDataWithBaseURL(null, formatLodString, "text/html", "UTF-8", null); } catch (Throwable e) { webView.loadData("<h1>Unable to load</h1><p>" + e.getLocalizedMessage() + "</p>", "text/html", "UTF-8"); } return dialog; } private void setWebView(WebView webView, Context context) { WebSettings settings = webView.getSettings(); settings.setDefaultTextEncodingName(KEY_UTF_8); settings.setJavaScriptEnabled(true); webView.addJavascriptInterface(new WebAppInterface(context), "Android"); } private String colorToHex(int color) { return Integer.toHexString(color).substring(2); } private int shiftColor(int color, boolean up) { float[] hsv = new float[3]; Color.colorToHSV(color, hsv); hsv[2] *= (up ? 1.1f : 0.9f); // value component return Color.HSVToColor(hsv); } public void setNeutralClickCallback(DialogInterface.OnClickListener neutralClickCallback) { mNeutralClickCallback = neutralClickCallback; } public void setPositiveClickCallback(DialogInterface.OnClickListener positiveClickCallback) { mPositiveClickCallback = positiveClickCallback; } public class WebAppInterface { Context mContext; /** * Instantiate the interface and set the context */ WebAppInterface(Context c) { mContext = c; } /** * Show a dialog about gank site **/ @JavascriptInterface public void clickThanksWords() { //MobclickAgent.onEvent(getActivity(), "link_click_donate"); DialogUtil.showAboutDonate((AppCompatActivity) getActivity()); } } }