Adding support for dynamically change icon shape for AdaptiveIcons

> This would allow developers to verify their icon designs on different
device configurations
> This settings is only visible when developer settings is enabled

Change-Id: I7e32abfede001c134f23390734dcd39c93b68b9a

1 files changed, 217 insertions, 0 deletions

diff --git a/src/com/android/launcher3/graphics/IconShapeOverride.java b/src/com/android/launcher3/graphics/IconShapeOverride.java
new file mode 100644
index 000000000..6e4d36642
--- /dev/null
+++ b/src/com/android/launcher3/graphics/IconShapeOverride.java
@@ -0,0 +1,217 @@
+/*
+ * Copyright (C) 2017 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.android.launcher3.graphics;
+
+import android.annotation.TargetApi;
+import android.app.AlarmManager;
+import android.app.PendingIntent;
+import android.app.ProgressDialog;
+import android.content.Context;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.content.res.Resources;
+import android.os.Build;
+import android.os.SystemClock;
+import android.preference.ListPreference;
+import android.preference.Preference;
+import android.preference.Preference.OnPreferenceChangeListener;
+import android.provider.Settings;
+import android.support.annotation.NonNull;
+import android.text.TextUtils;
+import android.util.Log;
+
+import com.android.launcher3.LauncherAppState;
+import com.android.launcher3.LauncherFiles;
+import com.android.launcher3.LauncherModel;
+import com.android.launcher3.R;
+import com.android.launcher3.Utilities;
+import com.android.launcher3.util.LooperExecuter;
+
+import java.lang.reflect.Field;
+
+/**
+ * Utility class to override shape of {@link android.graphics.drawable.AdaptiveIconDrawable}.
+ */
+@TargetApi(Build.VERSION_CODES.O)
+public class IconShapeOverride {
+
+    private static final String TAG = "IconShapeOverride";
+
+    public static final String KEY_PREFERENCE = "pref_override_icon_shape";
+
+    // Time to wait before killing the process this ensures that the progress bar is visible for
+    // sufficient time so that there is no flicker.
+    private static final long PROCESS_KILL_DELAY_MS = 1000;
+
+    private static final int RESTART_REQUEST_CODE = 42; // the answer to everything
+
+    public static boolean isSupported(Context context) {
+        if (!Utilities.isAtLeastO()) {
+            return false;
+        }
+        // Only supported when developer settings is enabled
+        if (Settings.Global.getInt(context.getContentResolver(),
+                Settings.Global.DEVELOPMENT_SETTINGS_ENABLED, 0) != 1) {
+            return false;
+        }
+
+        try {
+            if (getSystemResField().get(null) != Resources.getSystem()) {
+                // Our assumption that mSystem is the system resource is not true.
+                return false;
+            }
+        } catch (Exception e) {
+            // Ignore, not supported
+            return false;
+        }
+
+        return getConfigResId() != 0;
+    }
+
+    public static void apply(Context context) {
+        if (!Utilities.isAtLeastO()) {
+            return;
+        }
+        String path = getAppliedValue(context);
+        if (TextUtils.isEmpty(path)) {
+            return;
+        }
+        if (!isSupported(context)) {
+            return;
+        }
+
+        // magic
+        try {
+            Resources override =
+                    new ResourcesOverride(Resources.getSystem(), getConfigResId(), path);
+            getSystemResField().set(null, override);
+        } catch (Exception e) {
+            Log.e(TAG, "Unable to override icon shape", e);
+            // revert value.
+            prefs(context).edit().remove(KEY_PREFERENCE).apply();
+        }
+    }
+
+    private static Field getSystemResField() throws Exception {
+        Field staticField = Resources.class.getDeclaredField("mSystem");
+        staticField.setAccessible(true);
+        return staticField;
+    }
+
+    private static int getConfigResId() {
+        return Resources.getSystem().getIdentifier("config_icon_mask", "string", "android");
+    }
+
+    private static String getAppliedValue(Context context) {
+        return prefs(context).getString(KEY_PREFERENCE, "");
+    }
+
+    private static SharedPreferences prefs(Context context) {
+        return context.getSharedPreferences(LauncherFiles.DEVICE_PREFERENCES_KEY, 0);
+    }
+
+    public static void handlePreferenceUi(ListPreference preference) {
+        Context context = preference.getContext();
+        preference.setValue(getAppliedValue(context));
+        preference.setOnPreferenceChangeListener(new PreferenceChangeHandler(context));
+    }
+
+    private static class ResourcesOverride extends Resources {
+
+        private final int mOverrideId;
+        private final String mOverrideValue;
+
+        @SuppressWarnings("deprecated")
+        public ResourcesOverride(Resources parent, int overrideId, String overrideValue) {
+            super(parent.getAssets(), parent.getDisplayMetrics(), parent.getConfiguration());
+            mOverrideId = overrideId;
+            mOverrideValue = overrideValue;
+        }
+
+        @NonNull
+        @Override
+        public String getString(int id) throws NotFoundException {
+            if (id == mOverrideId) {
+                return mOverrideValue;
+            }
+            return super.getString(id);
+        }
+    }
+
+    private static class PreferenceChangeHandler implements OnPreferenceChangeListener {
+
+        private final Context mContext;
+
+        private PreferenceChangeHandler(Context context) {
+            mContext = context;
+        }
+
+        @Override
+        public boolean onPreferenceChange(Preference preference, Object o) {
+            String newValue = (String) o;
+            if (!getAppliedValue(mContext).equals(newValue)) {
+                // Value has changed
+                ProgressDialog.show(mContext,
+                        null /* title */,
+                        mContext.getString(R.string.icon_shape_override_progress),
+                        true /* indeterminate */,
+                        false /* cancelable */);
+                new LooperExecuter(LauncherModel.getWorkerLooper()).execute(
+                        new OverrideApplyHandler(mContext, newValue));
+            }
+            return false;
+        }
+    }
+
+    private static class OverrideApplyHandler implements Runnable {
+
+        private final Context mContext;
+        private final String mValue;
+
+        private OverrideApplyHandler(Context context, String value) {
+            mContext = context;
+            mValue = value;
+        }
+
+        @Override
+        public void run() {
+            // Synchronously write the preference.
+            prefs(mContext).edit().putString(KEY_PREFERENCE, mValue).commit();
+            // Clear the icon cache.
+            LauncherAppState.getInstance(mContext).getIconCache().clear();
+
+            // Wait for it
+            try {
+                Thread.sleep(PROCESS_KILL_DELAY_MS);
+            } catch (Exception e) {
+                Log.e(TAG, "Error waiting", e);
+            }
+
+            // Schedule an alarm before we kill ourself.
+            Intent homeIntent = new Intent(Intent.ACTION_MAIN)
+                    .addCategory(Intent.CATEGORY_HOME)
+                    .setPackage(mContext.getPackageName())
+                    .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+            PendingIntent pi = PendingIntent.getActivity(mContext, RESTART_REQUEST_CODE,
+                    homeIntent, PendingIntent.FLAG_CANCEL_CURRENT | PendingIntent.FLAG_ONE_SHOT);
+            mContext.getSystemService(AlarmManager.class).setExact(
+                    AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime() + 50, pi);
+
+            // Kill process
+            android.os.Process.killProcess(android.os.Process.myPid());
+        }
+    }
+}