1 /* 2 * Copyright (C) 2013 Google Inc. 3 * Licensed to The Android Open Source Project. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package com.android.mail.ui; 19 20 import android.app.Fragment; 21 22 import com.android.mail.utils.LogTag; 23 import com.android.mail.utils.LogUtils; 24 25 /** 26 * Small Runnable-like wrapper that first checks that the Fragment is in a good state before 27 * doing any work. Ideal for use with a {@link android.os.Handler}. 28 */ 29 public abstract class FragmentRunnable implements Runnable { 30 private static final String LOG_TAG = LogTag.getLogTag(); 31 32 private final String mOpName; 33 private final Fragment mFragment; 34 FragmentRunnable(String opName, Fragment fragment)35 public FragmentRunnable(String opName, Fragment fragment) { 36 mOpName = opName; 37 mFragment = fragment; 38 } 39 go()40 public abstract void go(); 41 42 @Override run()43 public void run() { 44 if (!mFragment.isAdded()) { 45 LogUtils.i(LOG_TAG, "Unable to run op='%s' b/c fragment is not attached: %s", 46 mOpName, mFragment); 47 return; 48 } 49 go(); 50 } 51 }