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 package com.example.android.batchstepsensor; 17 18 import android.os.Bundle; 19 import android.support.v4.app.FragmentManager; 20 import android.support.v4.app.FragmentTransaction; 21 import android.view.Menu; 22 23 import com.example.android.common.activities.SampleActivityBase; 24 import com.example.android.common.logger.Log; 25 26 import com.example.android.batchstepsensor.cardstream.CardStream; 27 import com.example.android.batchstepsensor.cardstream.CardStreamFragment; 28 import com.example.android.batchstepsensor.cardstream.CardStreamState; 29 import com.example.android.batchstepsensor.cardstream.OnCardClickListener; 30 import com.example.android.batchstepsensor.cardstream.StreamRetentionFragment; 31 32 public class MainActivity extends SampleActivityBase implements CardStream { 33 public static final String TAG = "MainActivity"; 34 public static final String FRAGTAG = "BatchStepSensorFragment"; 35 36 private CardStreamFragment mCardStreamFragment; 37 38 private StreamRetentionFragment mRetentionFragment; 39 private static final String RETENTION_TAG = "retention"; 40 41 @Override 42 protected void onCreate(Bundle savedInstanceState) { 43 super.onCreate(savedInstanceState); 44 setContentView(R.layout.activity_main); 45 46 FragmentManager fm = getSupportFragmentManager(); 47 BatchStepSensorFragment fragment = 48 (BatchStepSensorFragment) fm.findFragmentByTag(FRAGTAG); 49 50 if (fragment == null) { 51 FragmentTransaction transaction = fm.beginTransaction(); 52 fragment = new BatchStepSensorFragment(); 53 transaction.add(fragment, FRAGTAG); 54 transaction.commit(); 55 } 56 57 // Use fragment as click listener for cards, but must implement correct interface 58 if (!(fragment instanceof OnCardClickListener)){ 59 throw new ClassCastException("BatchStepSensorFragment must " + 60 "implement OnCardClickListener interface."); 61 } 62 OnCardClickListener clickListener = (OnCardClickListener) fm.findFragmentByTag(FRAGTAG); 63 64 mRetentionFragment = (StreamRetentionFragment) fm.findFragmentByTag(RETENTION_TAG); 65 if (mRetentionFragment == null) { 66 mRetentionFragment = new StreamRetentionFragment(); 67 fm.beginTransaction().add(mRetentionFragment, RETENTION_TAG).commit(); 68 } else { 69 // If the retention fragment already existed, we need to pull some state. 70 // pull state out 71 CardStreamState state = mRetentionFragment.getCardStream(); 72 73 // dump it in CardStreamFragment. 74 mCardStreamFragment = 75 (CardStreamFragment) fm.findFragmentById(R.id.fragment_cardstream); 76 mCardStreamFragment.restoreState(state, clickListener); 77 } 78 } 79 80 public CardStreamFragment getCardStream() { 81 if (mCardStreamFragment == null) { 82 mCardStreamFragment = (CardStreamFragment) 83 getSupportFragmentManager().findFragmentById(R.id.fragment_cardstream); 84 } 85 return mCardStreamFragment; 86 } 87 88 @Override 89 protected void onSaveInstanceState(Bundle outState) { 90 super.onSaveInstanceState(outState); 91 CardStreamState state = getCardStream().dumpState(); 92 mRetentionFragment.storeCardStream(state); 93 } 94 } 95
