Added changelog. Auto hide bottom bar and fab if playing queue is empty

app/src/main/java/com/kabouzeid/gramophone/dialogs/AboutDialog.java

@@ -39,6 +39,14 @@ public class AboutDialog extends LeakDetectDialogFragment {
                                 getActivity().getResources().getText(R.string.credits_4))
                 )
                 .positiveText(android.R.string.ok)
+                .neutralText(R.string.changelog)
+                .callback(new MaterialDialog.ButtonCallback() {
+                    @Override
+                    public void onNeutral(MaterialDialog dialog) {
+                        super.onNeutral(dialog);
+                        ChangelogDialog.create().show(getActivity().getSupportFragmentManager(), "CHANGE_LOG_DIALOG");
+                    }
+                })
                 .build();
     }
 }

app/src/main/java/com/kabouzeid/gramophone/dialogs/ChangelogDialog.java

@@ -0,0 +1,96 @@
+package com.kabouzeid.gramophone.dialogs;
+
+import android.annotation.SuppressLint;
+import android.app.Dialog;
+import android.content.DialogInterface;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.view.InflateException;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.webkit.WebView;
+
+import com.afollestad.materialdialogs.MaterialDialog;
+import com.afollestad.materialdialogs.ThemeSingleton;
+import com.kabouzeid.gramophone.R;
+import com.kabouzeid.gramophone.util.ColorUtil;
+import com.kabouzeid.gramophone.util.PreferenceUtil;
+
+import java.io.BufferedReader;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+
+/**
+ * @author Aidan Follestad (afollestad)
+ */
+public class ChangelogDialog extends LeakDetectDialogFragment {
+
+    public static ChangelogDialog create() {
+        return new ChangelogDialog();
+    }
+
+
+    @SuppressLint("InflateParams")
+    @NonNull
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        final View customView;
+        try {
+            customView = LayoutInflater.from(getActivity()).inflate(R.layout.dialog_web_view, null);
+        } catch (InflateException e) {
+            e.printStackTrace();
+            return new MaterialDialog.Builder(getActivity())
+                    .title(android.R.string.dialog_alert_title)
+                    .content("This device doesn't support web view, which is necessary to view the change log. It is missing a system component.")
+                    .positiveText(android.R.string.ok)
+                    .build();
+        }
+        MaterialDialog dialog = new MaterialDialog.Builder(getActivity())
+                .title(R.string.changelog)
+                .customView(customView, false)
+                .positiveText(android.R.string.ok)
+                .showListener(new DialogInterface.OnShowListener() {
+                    @Override
+                    public void onShow(DialogInterface dialog) {
+                        try {
+                            PackageInfo pInfo = getActivity().getPackageManager().getPackageInfo(getActivity().getPackageName(), 0);
+                            int currentVersion = pInfo.versionCode;
+                            PreferenceUtil.getInstance(getActivity()).setLastChangeLogVersion(currentVersion);
+                        } catch (PackageManager.NameNotFoundException e) {
+                            e.printStackTrace();
+                        }
+                    }
+                })
+                .build();
+
+        final WebView webView = (WebView) customView.findViewById(R.id.web_view);
+        try {
+            // Load from changelog.html in the assets folder
+            StringBuilder buf = new StringBuilder();
+            InputStream json = getActivity().getAssets().open("changelog.html");
+            BufferedReader in = new BufferedReader(new InputStreamReader(json, "UTF-8"));
+            String str;
+            while ((str = in.readLine()) != null)
+                buf.append(str);
+            in.close();
+
+            // Inject color values for WebView body background and links
+            webView.loadData(buf.toString()
+                    .replace("{style-placeholder}", ThemeSingleton.get().darkTheme ?
+                            "body { background-color: #444444; color: #fff; }" :
+                            "body { background-color: #EDEDED; color: #000; }")
+                    .replace("{link-color}", colorToHex(ThemeSingleton.get().positiveColor.getDefaultColor()))
+                    .replace("{link-color-active}", colorToHex(ColorUtil.shiftColorUp(ThemeSingleton.get().positiveColor.getDefaultColor())))
+                    , "text/html", "UTF-8");
+        } catch (Throwable e) {
+            webView.loadData("<h1>Unable to load</h1><p>" + e.getLocalizedMessage() + "</p>", "text/html", "UTF-8");
+        }
+        return dialog;
+    }
+
+    private String colorToHex(int color) {
+        return Integer.toHexString(color).substring(2);
+    }
+}