Log the process importance.

Application/src/main/java/org/chromium/customtabsclient/MainActivity.java

 // Copyright 2015 Google Inc. All Rights Reserved.
 //
 // 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.chromium.customtabsclient;
 
 import android.app.Activity;
+import android.app.ActivityManager;
 import android.app.ActivityOptions;
 import android.app.PendingIntent;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.graphics.Color;
 import android.media.MediaPlayer;
 import android.net.Uri;
 import android.os.Bundle;
+import android.os.Handler;
+import android.os.Looper;
 import android.support.customtabs.CustomTabsCallback;
 import android.support.customtabs.CustomTabsClient;
 import android.support.customtabs.CustomTabsIntent;
 import android.support.customtabs.CustomTabsServiceConnection;
 import android.support.customtabs.CustomTabsSession;
 import android.text.TextUtils;
 import android.util.Log;
 import android.util.Pair;
 import android.view.LayoutInflater;
 import android.view.View;
@@ skipping 24 matching lines @@
     private CustomTabsSession mCustomTabsSession;
     private CustomTabsClient mClient;
     private CustomTabsServiceConnection mConnection;
     private String mPackageNameToBind;
     private Button mConnectButton;
     private Button mWarmupButton;
     private Button mMayLaunchButton;
     private Button mLaunchButton;
     private MediaPlayer mMediaPlayer;
 
+    /**
+     * Once per second, asks the framework for the process importance, and logs any change.
+     */
+    private Runnable mLogImportance = new Runnable() {
+        private int mPreviousImportance = -1;
+        private boolean mPreviousServiceInUse = false;
+        private Handler mHandler = new Handler(Looper.getMainLooper());
+
+        @Override
+        public void run() {
+            ActivityManager.RunningAppProcessInfo state =
+                    new ActivityManager.RunningAppProcessInfo();
+            ActivityManager.getMyMemoryState(state);
+            int importance = state.importance;
+            boolean serviceInUse = state.importanceReasonCode
+                    == ActivityManager.RunningAppProcessInfo.REASON_SERVICE_IN_USE;
+            if (importance != mPreviousImportance || serviceInUse != mPreviousServiceInUse) {
+                mPreviousImportance = importance;
+                mPreviousServiceInUse = serviceInUse;
+                String message = "New importance = " + importance;
+                if (serviceInUse) message += " (Reason: Service in use)";
+                Log.w(TAG, message);
+            }
+            mHandler.postDelayed(this, 1000);
+        }
+    };
+
     private static class NavigationCallback extends CustomTabsCallback {
         @Override
         public void onNavigationEvent(int navigationEvent, Bundle extras) {
             Log.w(TAG, "onNavigationEvent: Code = " + navigationEvent);
         }
     }
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ skipping 56 matching lines @@
                     return;
                 }
                 mPackageNameToBind = item.second;
             }
 
             @Override
             public void onNothingSelected(AdapterView<?> parent) {
                 mPackageNameToBind = null;
             }
         });
+
+        mLogImportance.run();
     }
 
     @Override
     protected void onDestroy() {
         unbindCustomTabsService();
         super.onDestroy();
     }
 
     private CustomTabsSession getSession() {
         if (mClient == null) {
@@ skipping 98 matching lines @@
 
     @Override
     public void onServiceDisconnected() {
         mConnectButton.setEnabled(true);
         mWarmupButton.setEnabled(false);
         mMayLaunchButton.setEnabled(false);
         mLaunchButton.setEnabled(false);
         mClient = null;
     }
 }