1 /* 2 * Copyright 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 18 19 package com.example.android.batchstepsensor; 20 21 import android.os.Bundle; 22 import android.support.v4.app.FragmentManager; 23 import android.support.v4.app.FragmentTransaction; 24 import android.view.Menu; 25 26 import com.example.android.common.activities.SampleActivityBase; 27 import com.example.android.common.logger.Log; 28 29 import com.example.android.batchstepsensor.cardstream.CardStream; 30 import com.example.android.batchstepsensor.cardstream.CardStreamFragment; 31 import com.example.android.batchstepsensor.cardstream.CardStreamState; 32 import com.example.android.batchstepsensor.cardstream.OnCardClickListener; 33 import com.example.android.batchstepsensor.cardstream.StreamRetentionFragment; 34 35 public class MainActivity extends SampleActivityBase implements CardStream { 36 public static final String TAG = "MainActivity"; 37 public static final String FRAGTAG = "BatchStepSensorFragment"; 38 39 private CardStreamFragment mCardStreamFragment; 40 41 private StreamRetentionFragment mRetentionFragment; 42 private static final String RETENTION_TAG = "retention"; 43 44 @Override onCreate(Bundle savedInstanceState)45 protected void onCreate(Bundle savedInstanceState) { 46 super.onCreate(savedInstanceState); 47 setContentView(R.layout.activity_main); 48 49 FragmentManager fm = getSupportFragmentManager(); 50 BatchStepSensorFragment fragment = 51 (BatchStepSensorFragment) fm.findFragmentByTag(FRAGTAG); 52 53 if (fragment == null) { 54 FragmentTransaction transaction = fm.beginTransaction(); 55 fragment = new BatchStepSensorFragment(); 56 transaction.add(fragment, FRAGTAG); 57 transaction.commit(); 58 } 59 60 // Use fragment as click listener for cards, but must implement correct interface 61 if(!(fragment instanceof OnCardClickListener)){ 62 throw new ClassCastException("BatchStepSensorFragment must " + 63 "implement OnCardClickListener interface."); 64 } 65 OnCardClickListener clickListener = (OnCardClickListener) fm.findFragmentByTag(FRAGTAG); 66 67 mRetentionFragment = (StreamRetentionFragment) fm.findFragmentByTag(RETENTION_TAG); 68 if (mRetentionFragment == null) { 69 mRetentionFragment = new StreamRetentionFragment(); 70 fm.beginTransaction().add(mRetentionFragment, RETENTION_TAG).commit(); 71 } else { 72 // If the retention fragment already existed, we need to pull some state. 73 // pull state out 74 CardStreamState state = mRetentionFragment.getCardStream(); 75 76 // dump it in CardStreamFragment. 77 mCardStreamFragment = 78 (CardStreamFragment) fm.findFragmentById(R.id.fragment_cardstream); 79 mCardStreamFragment.restoreState(state, clickListener); 80 } 81 } 82 getCardStream()83 public CardStreamFragment getCardStream() { 84 if (mCardStreamFragment == null) { 85 mCardStreamFragment = (CardStreamFragment) 86 getSupportFragmentManager().findFragmentById(R.id.fragment_cardstream); 87 } 88 return mCardStreamFragment; 89 } 90 91 @Override onSaveInstanceState(Bundle outState)92 protected void onSaveInstanceState(Bundle outState) { 93 super.onSaveInstanceState(outState); 94 CardStreamState state = getCardStream().dumpState(); 95 mRetentionFragment.storeCardStream(state); 96 } 97 } 98