1 files changed, 190 insertions, 0 deletions
diff --git a/src/org/cyanogenmod/themes/provider/util/IconPreviewHelper.java b/src/org/cyanogenmod/themes/provider/util/IconPreviewHelper.java
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+++ b/src/org/cyanogenmod/themes/provider/util/IconPreviewHelper.java
@@ -0,0 +1,190 @@
+/*
+ * Copyright (C) 2014 The CyanogenMod 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 org.cyanogenmod.themes.provider.util;
+
+import android.app.ActivityManager;
+import android.app.ComposedIconInfo;
+import android.app.IconPackHelper;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.pm.ActivityInfo;
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageItemInfo;
+import android.content.pm.PackageManager;
+import android.content.pm.PackageManager.NameNotFoundException;
+import android.content.res.AssetManager;
+import android.content.res.Configuration;
+import android.content.res.Resources;
+import android.graphics.drawable.Drawable;
+import android.util.DisplayMetrics;
+import android.util.Log;
+import android.util.SparseArray;
+
+/**
+ * This class handles all the logic to build a preview icon
+ * If the system currently has a theme applied we do NOT
+ * want this code to be impacted by it. So code in this
+ * class creates special "no theme attached" resource objects
+ * to retrieve objects from.
+ */
+public class IconPreviewHelper {
+    private static final String TAG = IconPreviewHelper.class.getSimpleName();
+    private final static float ICON_SCALE_FACTOR = 1.3f; //Arbitrary. Looks good
+
+    private Context mContext;
+    private DisplayMetrics mDisplayMetrics;
+    private Configuration mConfiguration;
+    private int mIconDpi = 0;
+    private String mThemePkgName;
+    private IconPackHelper mIconPackHelper;
+    private int mIconSize;
+
+    /**
+     * @param themePkgName - The package name of the theme we wish to preview
+     */
+    public IconPreviewHelper(Context context, String themePkgName) {
+        mContext = context;
+        mDisplayMetrics = context.getResources().getDisplayMetrics();
+        mConfiguration = context.getResources().getConfiguration();
+        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
+        mIconDpi = (int) (am.getLauncherLargeIconDensity() * ICON_SCALE_FACTOR);
+        mThemePkgName = themePkgName;
+        mIconPackHelper = new IconPackHelper(mContext);
+        try {
+            mIconPackHelper.loadIconPack(mThemePkgName);
+        } catch (NameNotFoundException e) {}
+        mIconSize = (int) (am.getLauncherLargeIconSize() * ICON_SCALE_FACTOR);
+    }
+
+    /**
+     * Returns the actual label name for a given component
+     * If the activity does not have a label it will return app's label
+     * If neither has a label returns empty string
+     */
+    public String getLabel(ComponentName component) {
+        String label = "";
+        try {
+            PackageManager pm = mContext.getPackageManager();
+            ApplicationInfo appInfo = pm.getApplicationInfo(component.getPackageName(), 0);
+            ActivityInfo activityInfo = pm.getActivityInfo(component, 0);
+
+            AssetManager assets = new AssetManager();
+            assets.addAssetPath(appInfo.publicSourceDir);
+            Resources res = new Resources(assets, mDisplayMetrics, mConfiguration);
+
+            if (activityInfo.labelRes != 0) {
+                label = res.getString(activityInfo.labelRes);
+            } else if (appInfo.labelRes != 0) {
+                label = res.getString(appInfo.labelRes);
+            }
+        } catch(NameNotFoundException exception) {
+            Log.e(TAG, "unable to find pkg for " + component.toString());
+        }
+        return label;
+    }
+
+    /**
+     * Returns the icon for the given component regardless of the system's
+     * currently applied theme. If the preview theme does not support the icon, then
+     * return the system default icon.
+     */
+    public Drawable getIcon(ComponentName component) {
+        String packageName = component.getPackageName();
+        String activityName = component.getClassName();
+        Drawable icon = getThemedIcon(packageName, activityName);
+        if (icon == null) {
+            icon = getDefaultIcon(packageName, activityName);
+        }
+        if (icon != null) {
+            icon.setBounds(0, 0, mIconSize, mIconSize);
+        }
+        return icon;
+    }
+
+    private Drawable getThemedIcon(String pkgName, String activityName) {
+        Drawable drawable = null;
+        ActivityInfo info = new ActivityInfo();
+        info.packageName = pkgName;
+        info.name = activityName;
+        drawable = mIconPackHelper.getDrawableForActivityWithDensity(info, mIconDpi);
+
+        return drawable;
+    }
+
+    /**
+     * Returns the default icon.  This can be the normal icon associated with the app or a composed
+     * icon if the icon pack supports background, mask, and/or foreground.
+     * @param pkgName
+     * @param activityName
+     * @return
+     */
+    private Drawable getDefaultIcon(String pkgName, String activityName) {
+        Drawable drawable = null;
+        ComponentName component = new ComponentName(pkgName, activityName);
+        PackageManager pm = mContext.getPackageManager();
+        Resources res = null;
+        try {
+            ActivityInfo info = pm.getActivityInfo(component, 0);
+            ApplicationInfo appInfo = pm.getApplicationInfo(pkgName, 0);
+
+            res = pm.getThemedResourcesForApplication(pkgName, mThemePkgName);
+
+            final int iconId = info.icon != 0 ? info.icon : appInfo.icon;
+            info.themedIcon = 0;
+            setupComposedIcon(res, info, iconId);
+            drawable = getFullResIcon(res, iconId);
+        } catch (NameNotFoundException e2) {
+           Log.w(TAG, "Unable to get the icon for " + pkgName + " using default");
+        }
+        drawable = (drawable != null) ?
+                getComposedIcon(res, drawable) : getFullResDefaultActivityIcon();
+        return drawable;
+    }
+
+    private Drawable getComposedIcon(Resources res, Drawable baseIcon) {
+        ComposedIconInfo iconInfo = mIconPackHelper.getComposedIconInfo();
+        if (res != null && iconInfo != null && (iconInfo.iconBacks != null ||
+                iconInfo.iconMask != 0 || iconInfo.iconUpon != 0)) {
+            return IconPackHelper.IconCustomizer.getComposedIconDrawable(baseIcon, res, iconInfo);
+        }
+        return baseIcon;
+    }
+
+    private void setupComposedIcon(Resources res, ActivityInfo info, int iconId) {
+        ComposedIconInfo iconInfo = mIconPackHelper.getComposedIconInfo();
+
+        res.setComposedIconInfo(iconInfo);
+
+        SparseArray<PackageItemInfo> icons = new SparseArray<PackageItemInfo>(1);
+        info.themedIcon = 0;
+        icons.put(iconId, info);
+        res.setIconResources(icons);
+    }
+
+    private Drawable getFullResIcon(Resources resources, int iconId) {
+        Drawable d;
+        try {
+            d = resources.getDrawableForDensity(iconId, mIconDpi, null, false);
+        } catch (Resources.NotFoundException e) {
+            d = null;
+        }
+        return (d != null) ? d : getFullResDefaultActivityIcon();
+    }
+
+    private Drawable getFullResDefaultActivityIcon() {
+        return getFullResIcon(Resources.getSystem(), android.R.mipmap.sym_def_app_icon);
+    }
+}