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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
      5  * except in compliance with the License. You may obtain a copy of the License at
      6  *
      7  *      http://www.apache.org/licenses/LICENSE-2.0
      8  *
      9  * Unless required by applicable law or agreed to in writing, software distributed under the
     10  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     11  * KIND, either express or implied. See the License for the specific language governing
     12  * permissions and limitations under the License.
     13  */
     14 
     15 package com.android.systemui;
     16 
     17 import android.content.res.Configuration;
     18 import android.provider.Settings;
     19 import android.util.Log;
     20 
     21 import com.android.systemui.R;
     22 import com.android.systemui.SystemUI;
     23 
     24 import java.io.FileDescriptor;
     25 import java.io.PrintWriter;
     26 
     27 /**
     28  * Ensure a single status bar service implementation is running at all times, using the in-process
     29  * implementation according to the product config.
     30  */
     31 public class SystemBars extends SystemUI {
     32     private static final String TAG = "SystemBars";
     33     private static final boolean DEBUG = false;
     34     private static final int WAIT_FOR_BARS_TO_DIE = 500;
     35 
     36     // in-process fallback implementation, per the product config
     37     private SystemUI mStatusBar;
     38 
     39     @Override
     40     public void start() {
     41         if (DEBUG) Log.d(TAG, "start");
     42         createStatusBarFromConfig();
     43     }
     44 
     45     @Override
     46     public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
     47         if (mStatusBar != null) {
     48             mStatusBar.dump(fd, pw, args);
     49         }
     50     }
     51 
     52     private void createStatusBarFromConfig() {
     53         if (DEBUG) Log.d(TAG, "createStatusBarFromConfig");
     54         final String clsName = mContext.getString(R.string.config_statusBarComponent);
     55         if (clsName == null || clsName.length() == 0) {
     56             throw andLog("No status bar component configured", null);
     57         }
     58         Class<?> cls = null;
     59         try {
     60             cls = mContext.getClassLoader().loadClass(clsName);
     61         } catch (Throwable t) {
     62             throw andLog("Error loading status bar component: " + clsName, t);
     63         }
     64         try {
     65             mStatusBar = (SystemUI) cls.newInstance();
     66         } catch (Throwable t) {
     67             throw andLog("Error creating status bar component: " + clsName, t);
     68         }
     69         mStatusBar.mContext = mContext;
     70         mStatusBar.mComponents = mComponents;
     71         mStatusBar.start();
     72         if (DEBUG) Log.d(TAG, "started " + mStatusBar.getClass().getSimpleName());
     73     }
     74 
     75     private RuntimeException andLog(String msg, Throwable t) {
     76         Log.w(TAG, msg, t);
     77         throw new RuntimeException(msg, t);
     78     }
     79 }
     80