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 package com.example.android.batchstepsensor; 18 19 import android.os.Bundle; 20 import android.support.v4.app.FragmentManager; 21 import android.support.v4.app.FragmentTransaction; 22 import android.view.Menu; 23 24 import com.example.android.common.activities.SampleActivityBase; 25 import com.example.android.common.logger.Log; 26 27 import com.example.android.batchstepsensor.cardstream.CardStream; 28 import com.example.android.batchstepsensor.cardstream.CardStreamFragment; 29 import com.example.android.batchstepsensor.cardstream.CardStreamState; 30 import com.example.android.batchstepsensor.cardstream.OnCardClickListener; 31 import com.example.android.batchstepsensor.cardstream.StreamRetentionFragment; 32 33 public class MainActivity extends SampleActivityBase implements CardStream { 34 public static final String TAG = "MainActivity"; 35 public static final String FRAGTAG = "BatchStepSensorFragment"; 36 37 private CardStreamFragment mCardStreamFragment; 38 39 private StreamRetentionFragment mRetentionFragment; 40 private static final String RETENTION_TAG = "retention"; 41 42 @Override 43 protected void onCreate(Bundle savedInstanceState) { 44 super.onCreate(savedInstanceState); 45 setContentView(R.layout.activity_main); 46 47 FragmentManager fm = getSupportFragmentManager(); 48 BatchStepSensorFragment fragment = 49 (BatchStepSensorFragment) fm.findFragmentByTag(FRAGTAG); 50 51 if (fragment == null) { 52 FragmentTransaction transaction = fm.beginTransaction(); 53 fragment = new BatchStepSensorFragment(); 54 transaction.add(fragment, FRAGTAG); 55 transaction.commit(); 56 } 57 58 // Use fragment as click listener for cards, but must implement correct interface 59 if (!(fragment instanceof OnCardClickListener)){ 60 throw new ClassCastException("BatchStepSensorFragment must " + 61 "implement OnCardClickListener interface."); 62 } 63 OnCardClickListener clickListener = (OnCardClickListener) fm.findFragmentByTag(FRAGTAG); 64 65 mRetentionFragment = (StreamRetentionFragment) fm.findFragmentByTag(RETENTION_TAG); 66 if (mRetentionFragment == null) { 67 mRetentionFragment = new StreamRetentionFragment(); 68 fm.beginTransaction().add(mRetentionFragment, RETENTION_TAG).commit(); 69 } else { 70 // If the retention fragment already existed, we need to pull some state. 71 // pull state out 72 CardStreamState state = mRetentionFragment.getCardStream(); 73 74 // dump it in CardStreamFragment. 75 mCardStreamFragment = 76 (CardStreamFragment) fm.findFragmentById(R.id.fragment_cardstream); 77 mCardStreamFragment.restoreState(state, clickListener); 78 } 79 } 80 81 public CardStreamFragment getCardStream() { 82 if (mCardStreamFragment == null) { 83 mCardStreamFragment = (CardStreamFragment) 84 getSupportFragmentManager().findFragmentById(R.id.fragment_cardstream); 85 } 86 return mCardStreamFragment; 87 } 88 89 @Override 90 protected void onSaveInstanceState(Bundle outState) { 91 super.onSaveInstanceState(outState); 92 CardStreamState state = getCardStream().dumpState(); 93 mRetentionFragment.storeCardStream(state); 94 } 95 } 96
