首页 > 代码库 > Android4.0设置界面改动总结（三）
Android4.0设置界面改动总结（三）
Android4.0设置界面改动总结大概介绍了一下设置改tab风格，事实上原理非常easy，理解两个基本的函数就可以：
①.invalidateHeaders()，调用此函数将又一次调用onBuildHeader()来又一次读取xml文件里的header，又一次刷新HeaderAdapter中的数据，因此刷新了ListView的内容，从而更新了界面。
②.onBuildHeaders()中调用loadHeadersFromResource(resId, headers); 就可以又一次载入HeaderAdapter的数据。
可是上次有一个问题，不能横竖屏切换，由于有一些bug未解决，所以我在onCreate中增加了：
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);这一句，
另外代码结构略微调整了一下，再和大家分享一下。
主要改动有下面两点：
①.能够横竖屏切换，主要是在HeaderAdapter中增加了一个函数：flushViewCache()。同意横竖屏切换时又一次刷新数据。
②.将每一个tab相应的xml布局当成每一个tab的tag传递给onBuildHeaders，又一次刷新缓存的HeaderAdapter。
好了，废话不多说了，直接上源代码。能够搜索标签 20140601，就可以找到我全部的改动。
Settings.java源代码：
/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settings;
import android.app.ActionBar;
import android.app.ActivityManager;
import com.android.internal.util.ArrayUtils;
import com.android.settings.accounts.AccountSyncSettings;
import com.android.settings.accounts.AuthenticatorHelper;
import com.android.settings.accounts.ManageAccountsSettings;
import com.android.settings.applications.ManageApplications;
import com.android.settings.bluetooth.BluetoothEnabler;
import com.android.settings.deviceinfo.Memory;
import com.android.settings.fuelgauge.PowerUsageSummary;
import com.android.settings.inputmethod.UserDictionaryAddWordFragment;
import com.android.settings.wifi.WifiEnabler;
import static com.sprd.android.config.OptConfig.LC_RAM_SUPPORT;
import android.accounts.Account;
import android.accounts.AccountManager;
import android.accounts.OnAccountsUpdateListener;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.INetworkManagementService;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.UserId;
import android.os.SystemProperties;
import android.os.TopwiseProp;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.preference.PreferenceActivity.Header;
import android.preference.PreferenceFragment;
import android.telephony.TelephonyManager;
import android.text.TextUtils;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListAdapter;
import android.widget.Switch;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import android.app.ActionBar;
import android.app.ActionBar.Tab;
import android.app.ActionBar.TabListener;
import android.app.FragmentTransaction;
/**
* Top-level settings activity to handle single pane and double pane UI layout.
*/
public class Settings extends PreferenceActivity
implements ButtonBarHandler, OnAccountsUpdateListener {
private static final String LOG_TAG = "Settings";
private static final String META_DATA_KEY_HEADER_ID =
"com.android.settings.TOP_LEVEL_HEADER_ID";
private static final String META_DATA_KEY_FRAGMENT_CLASS =
"com.android.settings.FRAGMENT_CLASS";
private static final String META_DATA_KEY_PARENT_TITLE =
"com.android.settings.PARENT_FRAGMENT_TITLE";
private static final String META_DATA_KEY_PARENT_FRAGMENT_CLASS =
"com.android.settings.PARENT_FRAGMENT_CLASS";
private static final String EXTRA_CLEAR_UI_OPTIONS = "settings:remove_ui_options";
private static final String SAVE_KEY_CURRENT_HEADER = "com.android.settings.CURRENT_HEADER";
private static final String SAVE_KEY_PARENT_HEADER = "com.android.settings.PARENT_HEADER";
//fix bug 210641 the text of "backup and reset" not appropriate ,when os did not support backup on 2013.9.4 start
private static final String GSETTINGS_PROVIDER = "com.google.settings";
//fix bug 210641 the text of "backup and reset" not appropriate ,when os did not support backup on 2013.9.4 send
public static boolean UNIVERSEUI_SUPPORT = SystemProperties.getBoolean("universe_ui_support",false);
public static final boolean CU_SUPPORT = SystemProperties.get("ro.operator").equals("cucc");
private String mFragmentClass;
private int mTopLevelHeaderId;
private Header mFirstHeader;
private Header mCurrentHeader;
private Header mParentHeader;
private boolean mInLocalHeaderSwitch;
//start by liweiping 20140601 for tab settings
private ActionBar mActionBar;
private int mCurrentTabIndex = 0;
private View mView;
public static LayoutInflater mInflater;
int mHeadersCategory = R.xml.settings_headers_uui;
private int[] mTabTitle = new int[] {
R.string.header_category_wireless_networks,
R.string.header_category_device,
R.string.header_category_personal,
R.string.header_category_system
};
//end by liweiping 20140601
// Show only these settings for restricted users
private int[] SETTINGS_FOR_RESTRICTED = {
R.id.wifi_settings,
R.id.bluetooth_settings,
R.id.sound_settings,
R.id.display_settings,
R.id.security_settings,
R.id.account_settings,
R.id.about_settings
};
private boolean mEnableUserManagement = false;
// TODO: Update Call Settings based on airplane mode state.
protected HashMap<Integer, Integer> mHeaderIndexMap = new HashMap<Integer, Integer>();
private AuthenticatorHelper mAuthenticatorHelper;
private Header mLastHeader;
private boolean mListeningToAccountUpdates;
private boolean mBluetoothEnable;
private boolean mVoiceCapable;
@Override
protected void onCreate(Bundle savedInstanceState) {
mBluetoothEnable = (SystemProperties.getInt("ro.tablet.bluetooth.enable", 1) != 0);
mBluetoothEnable = (SystemProperties.getInt("ro.tablet.bluetooth.enable", 1) != 0);
mVoiceCapable = getResources().getBoolean(com.android.internal.R.bool.config_voice_capable);
if (getIntent().getBooleanExtra(EXTRA_CLEAR_UI_OPTIONS, false)) {
getWindow().setUiOptions(0);
}
if (android.provider.Settings.Secure.getInt(getContentResolver(), "multiuser_enabled", -1)
> 0) {
mEnableUserManagement = true;
}
mAuthenticatorHelper = new AuthenticatorHelper();
mAuthenticatorHelper.updateAuthDescriptions(this);
mAuthenticatorHelper.onAccountsUpdated(this, null);
getMetaData();
mInLocalHeaderSwitch = true;
super.onCreate(savedInstanceState);
mInLocalHeaderSwitch = false;
//For LowCost case, define the list selector by itself
if (LC_RAM_SUPPORT)
getListView().setSelector(R.drawable.list_selector_holo_dark);
if (!onIsHidingHeaders() && onIsMultiPane()) {
highlightHeader(mTopLevelHeaderId);
// Force the title so that it doesn't get overridden by a direct launch of
// a specific settings screen.
setTitle(R.string.settings_label);
}
// Retrieve any saved state
if (savedInstanceState != null) {
mCurrentHeader = savedInstanceState.getParcelable(SAVE_KEY_CURRENT_HEADER);
mParentHeader = savedInstanceState.getParcelable(SAVE_KEY_PARENT_HEADER);
}
// If the current header was saved, switch to it
if (savedInstanceState != null && mCurrentHeader != null) {
//switchToHeaderLocal(mCurrentHeader);
showBreadCrumbs(mCurrentHeader.title, null);
}
if (mParentHeader != null) {
setParentTitle(mParentHeader.title, null, new OnClickListener() {
public void onClick(View v) {
switchToParent(mParentHeader.fragment);
}
});
}
// Override up navigation for multi-pane, since we handle it in the fragment breadcrumbs
if (onIsMultiPane()) {
getActionBar().setDisplayHomeAsUpEnabled(false);
getActionBar().setHomeButtonEnabled(false);
}
//start by liweiping 20140601 for tab settings
mInflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (UNIVERSEUI_SUPPORT) {
if (this.getClass().equals(Settings.class)) {
int index = getIntent().getIntExtra("tab_index", mCurrentTabIndex);
setupTab();
chooseTab(index);
}
}
//end by liweiping 20140601 for tab settings
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
// Save the current fragment, if it is the same as originally launched
if (mCurrentHeader != null) {
outState.putParcelable(SAVE_KEY_CURRENT_HEADER, mCurrentHeader);
}
if (mParentHeader != null) {
outState.putParcelable(SAVE_KEY_PARENT_HEADER, mParentHeader);
}
}
@Override
public void onResume() {
super.onResume();
ListAdapter listAdapter = getListAdapter();
if (listAdapter instanceof HeaderAdapter) {
//start by liweiping 20140601 for tab settings
((HeaderAdapter) listAdapter).flushViewCache();
//end by liweiping 20140601 for tab settings
((HeaderAdapter) listAdapter).resume();
}
invalidateHeaders();
setActionBarStyle();//add by liweiping 20140210 for bug 173
}
//start by liweiping 20140210 for bug 173
/* Set ActionBar with popup function */
protected void setActionBarStyle() {
ActionBar actionBar = getActionBar();
if (actionBar == null){
return;
}
if ( this.toString().contains("SubSettings") ) {
actionBar.setDisplayOptions(ActionBar.DISPLAY_HOME_AS_UP, ActionBar.DISPLAY_HOME_AS_UP);
actionBar.setDisplayHomeAsUpEnabled(true);
}
else {
actionBar.setDisplayOptions(ActionBar.DISPLAY_HOME_AS_UP
^ ActionBar.DISPLAY_HOME_AS_UP
, ActionBar.DISPLAY_HOME_AS_UP);
actionBar.setDisplayHomeAsUpEnabled(false);
}
}
//end by liweiping 20140210
@Override
public void onPause() {
super.onPause();
ListAdapter listAdapter = getListAdapter();
if (listAdapter instanceof HeaderAdapter) {
((HeaderAdapter) listAdapter).pause();
}
}
private String getRunningActivityName() {
ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
return activityManager != null ? activityManager.getRunningTasks(1).get(0).topActivity
.getClassName() : null;
}
// fix bug 185285 to avoid jump out of Settings when Locale changed on 20130819 begin
/*@Override
public void onBackPressed() {
if (!moveTaskToBack(false)) {
super.onBackPressed();
}
}*/
// fix bug 185285 to avoid jump out of Settings when Locale changed on 20130819 end
@Override
public void onDestroy() {
super.onDestroy();
if (mListeningToAccountUpdates) {
AccountManager.get(this).removeOnAccountsUpdatedListener(this);
}
}
private void switchToHeaderLocal(Header header) {
mInLocalHeaderSwitch = true;
switchToHeader(header);
mInLocalHeaderSwitch = false;
}
@Override
public void switchToHeader(Header header) {
if (!mInLocalHeaderSwitch) {
mCurrentHeader = null;
mParentHeader = null;
}
super.switchToHeader(header);
}
/**
* Switch to parent fragment and store the grand parent's info
* @param className name of the activity wrapper for the parent fragment.
*/
private void switchToParent(String className) {
final ComponentName cn = new ComponentName(this, className);
try {
final PackageManager pm = getPackageManager();
final ActivityInfo parentInfo = pm.getActivityInfo(cn, PackageManager.GET_META_DATA);
if (parentInfo != null && parentInfo.metaData != null) {
String fragmentClass = parentInfo.metaData.getString(META_DATA_KEY_FRAGMENT_CLASS);
CharSequence fragmentTitle = parentInfo.loadLabel(pm);
Header parentHeader = new Header();
parentHeader.fragment = fragmentClass;
parentHeader.title = fragmentTitle;
mCurrentHeader = parentHeader;
switchToHeaderLocal(parentHeader);
highlightHeader(mTopLevelHeaderId);
mParentHeader = new Header();
mParentHeader.fragment
= parentInfo.metaData.getString(META_DATA_KEY_PARENT_FRAGMENT_CLASS);
mParentHeader.title = parentInfo.metaData.getString(META_DATA_KEY_PARENT_TITLE);
}
} catch (NameNotFoundException nnfe) {
Log.w(LOG_TAG, "Could not find parent activity : " + className);
}
}
@Override
public void onNewIntent(Intent intent) {
super.onNewIntent(intent);
// If it is not launched from history, then reset to top-level
if ((intent.getFlags() & Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY) == 0
&& mFirstHeader != null && !onIsHidingHeaders() && onIsMultiPane()) {
switchToHeaderLocal(mFirstHeader);
}
}
private void highlightHeader(int id) {
if (id != 0) {
Integer index = mHeaderIndexMap.get(id);
if (index != null) {
getListView().setItemChecked(index, true);
getListView().smoothScrollToPosition(index);
}
}
}
@Override
public Intent getIntent() {
Intent superIntent = super.getIntent();
String startingFragment = getStartingFragmentClass(superIntent);
// This is called from super.onCreate, isMultiPane() is not yet reliable
// Do not use onIsHidingHeaders either, which relies itself on this method
if (startingFragment != null && !onIsMultiPane()) {
Intent modIntent = new Intent(superIntent);
modIntent.putExtra(EXTRA_SHOW_FRAGMENT, startingFragment);
Bundle args = superIntent.getExtras();
if (args != null) {
args = new Bundle(args);
} else {
args = new Bundle();
}
args.putParcelable("intent", superIntent);
modIntent.putExtra(EXTRA_SHOW_FRAGMENT_ARGUMENTS, superIntent.getExtras());
return modIntent;
}
return superIntent;
}
/**
* Checks if the component name in the intent is different from the Settings class and
* returns the class name to load as a fragment.
*/
protected String getStartingFragmentClass(Intent intent) {
if (mFragmentClass != null) return mFragmentClass;
String intentClass = intent.getComponent().getClassName();
if (intentClass.equals(getClass().getName())) return null;
if ("com.android.settings.ManageApplications".equals(intentClass)
|| "com.android.settings.RunningServices".equals(intentClass)
|| "com.android.settings.applications.StorageUse".equals(intentClass)) {
// Old names of manage apps.
intentClass = com.android.settings.applications.ManageApplications.class.getName();
}
return intentClass;
}
/**
* Override initial header when an activity-alias is causing Settings to be launched
* for a specific fragment encoded in the android:name parameter.
*/
@Override
public Header onGetInitialHeader() {
String fragmentClass = getStartingFragmentClass(super.getIntent());
if (fragmentClass != null) {
Header header = new Header();
header.fragment = fragmentClass;
header.title = getTitle();
header.fragmentArguments = getIntent().getExtras();
mCurrentHeader = header;
return header;
}
return mFirstHeader;
}
@Override
public Intent onBuildStartFragmentIntent(String fragmentName, Bundle args,
int titleRes, int shortTitleRes) {
Intent intent = super.onBuildStartFragmentIntent(fragmentName, args,
titleRes, shortTitleRes);
// some fragments want to avoid split actionbar
if (DataUsageSummary.class.getName().equals(fragmentName) ||
PowerUsageSummary.class.getName().equals(fragmentName) ||
AccountSyncSettings.class.getName().equals(fragmentName) ||
UserDictionarySettings.class.getName().equals(fragmentName) ||
Memory.class.getName().equals(fragmentName) ||
ManageApplications.class.getName().equals(fragmentName) ||
WirelessSettings.class.getName().equals(fragmentName) ||
SoundSettings.class.getName().equals(fragmentName) ||
PrivacySettings.class.getName().equals(fragmentName) ||
// SPRD: Modify 20130830 Spreadst of Bug 207441 clipboard can not be called
UserDictionaryAddWordFragment.class.getName().equals(fragmentName) ||
ManageAccountsSettings.class.getName().equals(fragmentName)) {
intent.putExtra(EXTRA_CLEAR_UI_OPTIONS, true);
}
//fix bug 226565 select englisg in userdictoryaddwors, rotate, the language change to chinses on 20131012 begin
intent.setClass(this, SubSettings.class);
/*
// fix bug 194403 to make the activity execute onCreate() method when orientation changed on 20130802 begin
Log.i(LOG_TAG,"fragmentName = " + fragmentName);
if (UserDictionaryAddWordFragment.class.getName().equals(fragmentName)) {
intent.setClass(this, LanguageSubSettings.class);
} else {
intent.setClass(this, SubSettings.class);
}
// fix bug 194403 to make the activity execute onCreate() method when orientation changed on 20130802 end
*/
// fix bug 226565 select englisg in userdictoryaddwors, rotate, the language change to chinses on 20131012 end
return intent;
}
/**
* Populate the activity with the top-level headers.
*/
@Override
public void onBuildHeaders(List<Header> headers) {
//start by liweiping 20140601 for tab settings
if(UNIVERSEUI_SUPPORT){
ListAdapter listAdapter = getListAdapter();
loadHeadersFromResource(mHeadersCategory, headers);
if (listAdapter instanceof HeaderAdapter) {
((HeaderAdapter) listAdapter).flushViewCache();
((HeaderAdapter) listAdapter).resume();
((HeaderAdapter) listAdapter).notifyDataSetChanged();
}
//end by liweiping 20140601 for tab settings
}else{
loadHeadersFromResource(R.xml.settings_headers, headers);
}
updateHeaderList(headers);
}
private void updateHeaderList(List<Header> target) {
int i = 0;
boolean IsSupVoice = Settings.this.getResources().getBoolean(com.android.internal.R.bool.
config_voice_capable);
while (i < target.size()) {
Header header = target.get(i);
// Ids are integers, so downcasting
int id = (int) header.id;
if (id == R.id.dock_settings) {
if (!needsDockSettings())
target.remove(header);
} else if (id == R.id.operator_settings || id == R.id.manufacturer_settings) {
Utils.updateHeaderToSpecificActivityFromMetaDataOrRemove(this, target, header);
} else if (id == R.id.wifi_settings) {
// Remove WiFi Settings if WiFi service is not available.
// Start by changyan 2014.01.02
//if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_WIFI)) {
if (!SystemProperties.getBoolean("ro.device.support.wifi", true)) {
//End by changyan
target.remove(header);
}
} else if (id == R.id.bluetooth_settings) {
//Start by changyan 2014.01.03
// Remove Bluetooth Settings if Bluetooth service is not available.
//if ((!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH))
// || (!mBluetoothEnable)) {
if (!SystemProperties.getBoolean("ro.device.support.bt", true)) {
//End by changyan
target.remove(header);
}
} else if (id == R.id.data_usage_settings) {
// Remove data usage when kernel module not enabled
final INetworkManagementService netManager = INetworkManagementService.Stub
.asInterface(ServiceManager.getService(Context.NETWORKMANAGEMENT_SERVICE));
// fix bug 182580 to delete the data usage item of settings on 20130717 begin
boolean support_cmcc = SystemProperties.get("ro.operator").equals("cmcc");
try {
if (!netManager.isBandwidthControlEnabled() || support_cmcc) {
target.remove(header);
}
} catch (RemoteException e) {
// ignored
}
// fix bug 182580 to delete the data usage item of settings on 20130717 end
} else if (id == R.id.account_settings) {
int headerIndex = i + 1;
i = insertAccountsHeaders(target, headerIndex);
} else if (id == R.id.user_settings) {
if (!mEnableUserManagement
|| !UserId.MU_ENABLED || UserId.myUserId() != 0
|| !getResources().getBoolean(R.bool.enable_user_management)
|| Utils.isMonkeyRunning()) {
target.remove(header);
}
} else if (id == R.id.dual_sim_settings) {
if (!TelephonyManager.isMultiSim() || (!mVoiceCapable)) {
target.remove(header);
}
} else if (id == R.id.network_preference_settings) {
if (!CU_SUPPORT) {
target.remove(header);
}
}
else if (id == R.id.sound_settings && IsSupVoice)
{
target.remove(header);
}
else if (id == R.id.audio_profiles && !IsSupVoice)
{
target.remove(header);
}
if (UserId.MU_ENABLED && UserId.myUserId() != 0
&& !ArrayUtils.contains(SETTINGS_FOR_RESTRICTED, id)) {
target.remove(header);
}
// Increment if the current one wasn't removed by the Utils code.
if (target.get(i) == header) {
// Hold on to the first header, when we need to reset to the top-level
if (mFirstHeader == null &&
HeaderAdapter.getHeaderType(header) != HeaderAdapter.HEADER_TYPE_CATEGORY) {
mFirstHeader = header;
}
mHeaderIndexMap.put(id, i);
i++;
}
}
}
private int insertAccountsHeaders(List<Header> target, int headerIndex) {
String[] accountTypes = mAuthenticatorHelper.getEnabledAccountTypes();
List<Header> accountHeaders = new ArrayList<Header>(accountTypes.length);
for (String accountType : accountTypes) {
if (accountType.startsWith("sprd")) {
continue;
}
CharSequence label = mAuthenticatorHelper.getLabelForType(this, accountType);
if (label == null) {
continue;
}
Account[] accounts = AccountManager.get(this).getAccountsByType(accountType);
boolean skipToAccount = accounts.length == 1
&& !mAuthenticatorHelper.hasAccountPreferences(accountType);
Header accHeader = new Header();
accHeader.title = label;
if (accHeader.extras == null) {
accHeader.extras = new Bundle();
}
if (skipToAccount) {
accHeader.breadCrumbTitleRes = R.string.account_sync_settings_title;
accHeader.breadCrumbShortTitleRes = R.string.account_sync_settings_title;
accHeader.fragment = AccountSyncSettings.class.getName();
accHeader.fragmentArguments = new Bundle();
// Need this for the icon
accHeader.extras.putString(ManageAccountsSettings.KEY_ACCOUNT_TYPE, accountType);
accHeader.extras.putParcelable(AccountSyncSettings.ACCOUNT_KEY, accounts[0]);
accHeader.fragmentArguments.putParcelable(AccountSyncSettings.ACCOUNT_KEY,
accounts[0]);
} else {
accHeader.breadCrumbTitle = label;
accHeader.breadCrumbShortTitle = label;
accHeader.fragment = ManageAccountsSettings.class.getName();
accHeader.fragmentArguments = new Bundle();
accHeader.extras.putString(ManageAccountsSettings.KEY_ACCOUNT_TYPE, accountType);
accHeader.fragmentArguments.putString(ManageAccountsSettings.KEY_ACCOUNT_TYPE,
accountType);
if (!isMultiPane()) {
accHeader.fragmentArguments.putString(ManageAccountsSettings.KEY_ACCOUNT_LABEL,
label.toString());
}
}
accountHeaders.add(accHeader);
}
// Sort by label
Collections.sort(accountHeaders, new Comparator<Header>() {
@Override
public int compare(Header h1, Header h2) {
return h1.title.toString().compareTo(h2.title.toString());
}
});
for (Header header : accountHeaders) {
target.add(headerIndex++, header);
}
if (!mListeningToAccountUpdates) {
AccountManager.get(this).addOnAccountsUpdatedListener(this, null, true);
mListeningToAccountUpdates = true;
}
return headerIndex;
}
private boolean needsDockSettings() {
return getResources().getBoolean(R.bool.has_dock_settings);
}
private void getMetaData() {
try {
ActivityInfo ai = getPackageManager().getActivityInfo(getComponentName(),
PackageManager.GET_META_DATA);
if (ai == null || ai.metaData =http://www.mamicode.com/= null) return;>
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