1 package com.icitymobile.anda.util;
2
3 import java.lang.ref.SoftReference;
4 import java.util.ArrayList;
5 import java.util.HashMap;
6 import java.util.Iterator;
7 import java.util.Map;
8 import java.util.Map.Entry;
9
10 import android.content.Context;
11 import android.content.Intent;
12 import android.os.Bundle;
13 import android.support.v4.app.Fragment;
14 import android.support.v4.app.FragmentManager;
15 import android.support.v4.app.FragmentTransaction;
16
17 import com.hualong.framework.log.Logger;
18
19 /**
20 * Fragment帮助类
21 */
22 public class FragmentHelper {
23
24 public static final String TAG = "FragmentHelper";
25
26 private static final String STATE_IDS = "fragment_ids";
27 private static final String STATE_CURRENT_FRAGMENT_ID = "current_fragment_id";
28 private static final String STATE_LAST_FRAGMENT = "last_fragment";
29
30 private Context mContext;
31 private FragmentManager mManager;
32 private int mContainerId;
33
34 private Map<String, SoftReference<Fragment>> mFragments = new HashMap<String, SoftReference<Fragment>>();
35 private String mCurrentFragmentId = null;
36 private Fragment mLastFragment;
37
38 public FragmentHelper(Context context, FragmentManager manager, int containerId) {
39 mContext = context;
40 mManager = manager;
41 mContainerId = containerId;
42 }
43
44 public Fragment getFragment(String fragmentId) {
45 Fragment fragment = null;
46 SoftReference<Fragment> reference = mFragments.get(fragmentId);
47 if (reference != null) {
48 fragment = reference.get();
49 }
50 return fragment;
51 }
52
53 public String getCurrentFragmentId() {
54 return mCurrentFragmentId;
55 }
56
57 public Fragment getCurrentFragment() {
58 return getFragment(getCurrentFragmentId());
59 }
60
61 public void switchFragment(String id, Intent intent) {
62 switchFragment(id, intent, -1);
63 }
64
65 public void switchFragment(String id, Intent intent, int transition) {
66 if (intent == null) {
67 return;
68 }
69 Fragment newFragment = getFragment(id);
70 if (mLastFragment == null || mLastFragment != newFragment) {
71 FragmentTransaction ft = mManager.beginTransaction();
72 if (mLastFragment != null) {
73 ft.hide(mLastFragment);
74 }
75 if (newFragment == null) {
76 Logger.i(TAG, TAG + ": Instantiate a new fragment " + id);
77 String fname = intent.getComponent().getClassName();
78 Bundle args = intent.getExtras();
79 newFragment = Fragment.instantiate(mContext, fname);
80 if (args != null) {
81 newFragment.setArguments(args);
82 }
83 mFragments.put(id, new SoftReference<Fragment>(newFragment));
84 ft.add(mContainerId, newFragment, id);
85 } else {
86 Logger.i(TAG, TAG + ": Load an old fragment " + id);
87 ft.show(newFragment);
88 }
89 if (transition != -1) {
90 ft.setTransition(transition);
91 }
92 mLastFragment = newFragment;
93 mCurrentFragmentId = id;
94 ft.commit();
95 // mManager.executePendingTransactions();
96 }
97 }
98
99 /**
100 * 在Bundle中保存状态
101 *
102 * @param bundle
103 */
104 public void saveInBundle(Bundle bundle) {
105 if (bundle == null) {
106 return;
107 }
108 Logger.i(TAG, TAG + ": saving in bundle");
109 ArrayList<String> idList = new ArrayList<String>(mFragments.keySet());
110 bundle.putStringArrayList(STATE_IDS, idList);
111
112 Iterator<Entry<String, SoftReference<Fragment>>> iter = mFragments.entrySet().iterator();
113 Entry<String, SoftReference<Fragment>> entry;
114 SoftReference<Fragment> reference;
115 Fragment fragment;
116 while (iter.hasNext()) {
117 entry = iter.next();
118 reference = entry.getValue();
119 if (reference != null) {
120 fragment = reference.get();
121 if (fragment != null) {
122 mManager.putFragment(bundle, entry.getKey(), fragment);
123 }
124 }
125 }
126
127 if (mCurrentFragmentId != null) {
128 bundle.putString(STATE_CURRENT_FRAGMENT_ID, mCurrentFragmentId);
129 }
130
131 if (mLastFragment != null) {
132 mManager.putFragment(bundle, STATE_LAST_FRAGMENT, mLastFragment);
133 }
134 }
135
136 /**
137 * 在Bundle中保存状态，只保存当前的fragment
138 *
139 * @param bundle
140 */
141 public void saveStateSimple(Bundle bundle) {
142 if (bundle == null) {
143 return;
144 }
145 Logger.i(TAG, TAG + ": saving in bundle simple");
146
147 if (mCurrentFragmentId != null) {
148 bundle.putString(STATE_CURRENT_FRAGMENT_ID, mCurrentFragmentId);
149
150 ArrayList<String> idList = new ArrayList<String>(1);
151 idList.add(mCurrentFragmentId);
152 bundle.putStringArrayList(STATE_IDS, idList);
153
154 Fragment currentFragment = getCurrentFragment();
155 if (currentFragment != null) {
156 mManager.putFragment(bundle, mCurrentFragmentId, currentFragment);
157 }
158 }
159
160 if (mLastFragment != null) {
161 mManager.putFragment(bundle, STATE_LAST_FRAGMENT, mLastFragment);
162 }
163 }
164
165 /**
166 * 从Bundle中恢复状态
167 *
168 * @param bundle
169 */
170 public void restoreFromBundle(Bundle bundle) {
171 if (bundle == null) {
172 return;
173 }
174 Logger.i(TAG, TAG + ": restoring from bundle");
175 ArrayList<String> idList = bundle.getStringArrayList(STATE_IDS);
176 if (idList != null) {
177 Fragment fragment;
178 for (String id : idList) {
179 fragment = mManager.getFragment(bundle, id);
180 if (fragment != null) {
181 mFragments.put(id, new SoftReference<Fragment>(fragment));
182 }
183 }
184 }
185
186 String currentId = bundle.getString(STATE_CURRENT_FRAGMENT_ID);
187 if (currentId != null) {
188 mCurrentFragmentId = currentId;
189 }
190
191 Fragment lastFragment = mManager.getFragment(bundle, STATE_LAST_FRAGMENT);
192 if (lastFragment != null) {
193 mLastFragment = lastFragment;
194 }
195 }
196 }
