package com.icitymobile.anda.util; import java.lang.ref.SoftReference;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry; import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction; import com.hualong.framework.log.Logger; /**
* Fragment帮助类
*/
public class FragmentHelper { public static final String TAG = "FragmentHelper"; private static final String STATE_IDS = "fragment_ids";
private static final String STATE_CURRENT_FRAGMENT_ID = "current_fragment_id";
private static final String STATE_LAST_FRAGMENT = "last_fragment"; private Context mContext;
private FragmentManager mManager;
private int mContainerId; private Map<String, SoftReference<Fragment>> mFragments = new HashMap<String, SoftReference<Fragment>>();
private String mCurrentFragmentId = null;
private Fragment mLastFragment; public FragmentHelper(Context context, FragmentManager manager, int containerId) {
mContext = context;
mManager = manager;
mContainerId = containerId;
} public Fragment getFragment(String fragmentId) {
Fragment fragment = null;
SoftReference<Fragment> reference = mFragments.get(fragmentId);
if (reference != null) {
fragment = reference.get();
}
return fragment;
} public String getCurrentFragmentId() {
return mCurrentFragmentId;
} public Fragment getCurrentFragment() {
return getFragment(getCurrentFragmentId());
} public void switchFragment(String id, Intent intent) {
switchFragment(id, intent, -);
} public void switchFragment(String id, Intent intent, int transition) {
if (intent == null) {
return;
}
Fragment newFragment = getFragment(id);
if (mLastFragment == null || mLastFragment != newFragment) {
FragmentTransaction ft = mManager.beginTransaction();
if (mLastFragment != null) {
ft.hide(mLastFragment);
}
if (newFragment == null) {
Logger.i(TAG, TAG + ": Instantiate a new fragment " + id);
String fname = intent.getComponent().getClassName();
Bundle args = intent.getExtras();
newFragment = Fragment.instantiate(mContext, fname);
if (args != null) {
newFragment.setArguments(args);
}
mFragments.put(id, new SoftReference<Fragment>(newFragment));
ft.add(mContainerId, newFragment, id);
} else {
Logger.i(TAG, TAG + ": Load an old fragment " + id);
ft.show(newFragment);
}
if (transition != -) {
ft.setTransition(transition);
}
mLastFragment = newFragment;
mCurrentFragmentId = id;
ft.commit();
// mManager.executePendingTransactions();
}
} /**
* 在Bundle中保存状态
*
* @param bundle
*/
public void saveInBundle(Bundle bundle) {
if (bundle == null) {
return;
}
Logger.i(TAG, TAG + ": saving in bundle");
ArrayList<String> idList = new ArrayList<String>(mFragments.keySet());
bundle.putStringArrayList(STATE_IDS, idList); Iterator<Entry<String, SoftReference<Fragment>>> iter = mFragments.entrySet().iterator();
Entry<String, SoftReference<Fragment>> entry;
SoftReference<Fragment> reference;
Fragment fragment;
while (iter.hasNext()) {
entry = iter.next();
reference = entry.getValue();
if (reference != null) {
fragment = reference.get();
if (fragment != null) {
mManager.putFragment(bundle, entry.getKey(), fragment);
}
}
} if (mCurrentFragmentId != null) {
bundle.putString(STATE_CURRENT_FRAGMENT_ID, mCurrentFragmentId);
} if (mLastFragment != null) {
mManager.putFragment(bundle, STATE_LAST_FRAGMENT, mLastFragment);
}
} /**
* 在Bundle中保存状态，只保存当前的fragment
*
* @param bundle
*/
public void saveStateSimple(Bundle bundle) {
if (bundle == null) {
return;
}
Logger.i(TAG, TAG + ": saving in bundle simple"); if (mCurrentFragmentId != null) {
bundle.putString(STATE_CURRENT_FRAGMENT_ID, mCurrentFragmentId); ArrayList<String> idList = new ArrayList<String>();
idList.add(mCurrentFragmentId);
bundle.putStringArrayList(STATE_IDS, idList); Fragment currentFragment = getCurrentFragment();
if (currentFragment != null) {
mManager.putFragment(bundle, mCurrentFragmentId, currentFragment);
}
} if (mLastFragment != null) {
mManager.putFragment(bundle, STATE_LAST_FRAGMENT, mLastFragment);
}
} /**
* 从Bundle中恢复状态
*
* @param bundle
*/
public void restoreFromBundle(Bundle bundle) {
if (bundle == null) {
return;
}
Logger.i(TAG, TAG + ": restoring from bundle");
ArrayList<String> idList = bundle.getStringArrayList(STATE_IDS);
if (idList != null) {
Fragment fragment;
for (String id : idList) {
fragment = mManager.getFragment(bundle, id);
if (fragment != null) {
mFragments.put(id, new SoftReference<Fragment>(fragment));
}
}
} String currentId = bundle.getString(STATE_CURRENT_FRAGMENT_ID);
if (currentId != null) {
mCurrentFragmentId = currentId;
} Fragment lastFragment = mManager.getFragment(bundle, STATE_LAST_FRAGMENT);
if (lastFragment != null) {
mLastFragment = lastFragment;
}
}
}