Java tutorial
/******************************************************************************* * Copyright (C) 2012 Google Inc. * Licensed to 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.mail.ui; import android.content.Context; import android.os.Bundle; import android.os.StrictMode; import android.support.v4.app.FragmentActivity; /** * <p> * A complete Mail activity instance. This is the toplevel class that creates the views and handles * the activity lifecycle.</p> * * <p>This class is abstract to allow many other activities to be quickly created by subclassing * this activity and overriding a small subset of the life cycle methods: for example * ComposeActivity and CreateShortcutActivity.</p> * * <p>In the Gmail codebase, this was called GmailBaseActivity</p> * */ public abstract class AbstractMailActivity extends FragmentActivity implements HelpCallback, RestrictedActivity { private final UiHandler mUiHandler = new UiHandler(); private static final boolean STRICT_MODE = false; @Override protected void onCreate(Bundle savedInstanceState) { if (STRICT_MODE) { StrictMode.setThreadPolicy( new StrictMode.ThreadPolicy.Builder().detectDiskReads().detectDiskWrites().detectNetwork() // or .detectAll() for all detectable problems .penaltyLog().build()); StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder().detectLeakedSqlLiteObjects() .detectLeakedClosableObjects().penaltyLog().build()); } super.onCreate(savedInstanceState); mUiHandler.setEnabled(true); } @Override protected void onStart() { super.onStart(); mUiHandler.setEnabled(true); } @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); mUiHandler.setEnabled(false); } @Override protected void onResume() { super.onResume(); mUiHandler.setEnabled(true); } /** * Get the contextual help parameter for this activity. This can be overridden * to allow the extending activities to return different help context strings. * The default implementation is to return "gm". * @return The help context of this activity. */ @Override public String getHelpContext() { return "Mail"; } @Override public Context getActivityContext() { return this; } }