Android 为什么不显示我的Listview？
我在android中有一个ListView，并设置了一个自定义适配器。我的问题是，不管适配器和notifyDataSetChanged（），列表视图都不显示任何内容 以下是我的代码：XML：Android 为什么不显示我的Listview？,android,android-listview,Android,Android Listview,我在android中有一个ListView，并设置了一个自定义适配器。我的问题是，不管适配器和notifyDataSetChanged（），列表视图都不显示任何内容 以下是我的代码：XML： <?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android" androi
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/drawerLayout"
android:layout_height="match_parent"
android:layout_width="match_parent">
<LinearLayout
android:id="@+id/content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ListView
android:id="@+id/list"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="1"
android:divider="@null" />
</LinearLayout>
<FrameLayout
android:id="@+id/mainContent"
android:layout_height="match_parent"
android:layout_width="match_parent">
</FrameLayout>
<!-- <TextView
android:id="@+id/empty"
android:text="TextView"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:gravity="center"/> -->
<!-- navigation drawer -->
<ListView
android:id="@+id/drawerList"
android:layout_width="240dp"
android:layout_height="match_parent"
android:divider="@null"
android:descendantFocusability="beforeDescendants"
android:listSelector="#FFFFFF"
android:background="#3b5998"
android:layout_gravity="left" />"
</android.support.v4.widget.DrawerLayout>
"));
//使url可点击
setMovementMethod（LinkMovementMethod.getInstance（））；
holder.url.setVisibility（View.VISIBLE）；
}否则{
//url为空，请从视图中删除
holder.url.setVisibility（View.GONE）；
}
//用户档案图片
holder.profilePic.setImageUrl（item.getProfilePic（），imageLoader）；
//馈送图像
如果（item.getImge（）！=null）{
holder.feedImageView.setImageUrl（item.getImge（），imageLoader）；
holder.feedImageView.setVisibility（View.VISIBLE）；
holder.feedImageView
.setResponseObserver（新的FeedImageView.ResponseObserver（）{
@凌驾
public void onError（）{
}
@凌驾
onSuccess（）上的公共void{
}
});
}否则{
holder.feedImageView.setVisibility（View.GONE）；
}
返回视图；
}
}
问题是屏幕上没有显示任何内容。我只能看到一个白色屏幕。我看不到所有的文本视图（在适配器中提到）及其文本。显然我做错了什么，但我不知道是什么。最后，我解决了问题 这是更新后的代码。我删除了arrayList.clear和feedItems.clear。它们正在清空我的listview MainActivity.java
package com.sri.vaave;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import com.android.volley.Cache;
import com.android.volley.Cache.Entry;
import com.android.volley.Request.Method;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonObjectRequest;
import com.sri.vaave.adapter.FeedListAdapter;
import com.sri.vaave.app.AppController;
import com.sri.vaave.data.FeedItem;
public class MainActivity extends Activity {
private static final String TAG = MainActivity.class.getSimpleName();
private ListView listView;
private FeedListAdapter listAdapter;
private List<FeedItem> feedItems;
private List<FeedItem> arrayTemplist;
private String URL_FEED = "http://coherendz.net/vaavefeed1.json";
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private ArrayList<NavDrawerItem> navDrawerItems;
private TypedArray navMenuIcons;
private NavDrawerListAdapter adapter;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
Iterator itr;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
feedItems = new ArrayList<FeedItem>();
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
buildFeed(0);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
getActionBar().setHomeButtonEnabled(true);
getActionBar().setDisplayHomeAsUpEnabled(true);
// These two lines not needed,
// just to get the look of facebook (changing background color & hiding the icon)
getActionBar().setBackgroundDrawable(new ColorDrawable(Color.parseColor("#3b5998")));
getActionBar().setIcon(
new ColorDrawable(getResources().getColor(android.R.color.transparent)));
mTitle = mDrawerTitle = getTitle();
navMenuTitles = getResources().getStringArray(R.array.Options);
// nav drawer icons from resources
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
mDrawerList = (ListView) findViewById(R.id.drawerList);
navDrawerItems = new ArrayList<NavDrawerItem>();
// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
// Photos
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1), true, "22"));
// Pages
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
// What's hot, We will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1), true, "50+"));
// all
navDrawerItems.add(new NavDrawerItem(navMenuTitles[6], navMenuIcons.getResourceId(6, -1)));
// Recycle the typed array
navMenuIcons.recycle();
// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, //nav menu toggle icon
R.string.drawer_open, // nav drawer open - description for accessibility
R.string.drawer_close // nav drawer close - description for accessibility
)
{
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
}
private void populateFeedList() {
// TODO Auto-generated method stub
feedItems = getData(0);
//getData(0);
populateListView(feedItems);
}
private void populateListView(List dataFeed) {
// TODO Auto-generated method stub
// feedItems = new ArrayList<FeedItem>();
listAdapter = new FeedListAdapter(this, dataFeed);
listView = (ListView) findViewById(R.id.list);
listView.setAdapter(listAdapter);
listAdapter.notifyDataSetChanged();
}
/***
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {// display view for selected nav drawer item
Toast.makeText(MainActivity.this,navMenuTitles[position]+" was selected", Toast.LENGTH_LONG).show();
setTitle(navMenuTitles[position]);
displayView(position);
mDrawerLayout.closeDrawer(mDrawerList);
}
private void displayView(int position) {
// TODO Auto-generated method stub
feedItems = new ArrayList<FeedItem>();
switch(position){
case 0: try {
buildFeed(0);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case 1: try {
buildFeed(7);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case 2: try {
buildFeed(1);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case 3: try {
buildFeed(13);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case 4: try {
buildFeed(12);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
default:
try {
buildFeed(0);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
}
}
}
private List getData(int nodeType) {
// TODO Auto-generated method stub
// We first check for cached request
Cache cache = AppController.getInstance().getRequestQueue().getCache();
Entry entry = cache.get(URL_FEED);
String data = null;
if (entry != null) {
// fetch the data from cache
try {
data = new String(entry.data, "UTF-8");
try {
parseJsonFeed(new JSONObject(data));
} catch (JSONException e) {
e.printStackTrace();
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
} else {
// making fresh volley request and getting json
JsonObjectRequest jsonReq = new JsonObjectRequest(Method.GET,
URL_FEED, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
VolleyLog.d(TAG, "Response: " + response.toString());
if (response != null) {
parseJsonFeed(response);
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
}
});
// Adding request to volley request queue
AppController.getInstance().addToRequestQueue(jsonReq);
}
return feedItems;
}
/**
* Parsing json reponse and passing the data to feed view list adapter
* */
private void parseJsonFeed(JSONObject response) {
FeedItem item;
itr = response.keys();
try
{
while(itr.hasNext())
{
String key = itr.next().toString();
JSONObject entry = response.getJSONObject(key);
JSONObject phone = entry.getJSONObject("basic");
String name = phone.getString("title");
String description = phone.getString("description");
int nodetype = phone.getInt("node_type");
JSONObject comments = entry.getJSONObject("comments");
String comments_count = comments.getString("count");
JSONObject like = entry.getJSONObject("likes");
String like_count = like.getString("count");
String readable_date = phone.getString("readable_date");
item = new FeedItem();
item.setNode_type(nodetype);
item.setName(String.valueOf(name));
item.setStatus(String.valueOf(description));
item.setReadable_date(String.valueOf(readable_date));
item.setComments_count(String.valueOf(comments_count));
item.setLike_count(String.valueOf(like_count));
feedItems.add(item);
}
}
catch (JSONException e)
{
e.printStackTrace();
}
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item))
{
return true;
}
// Handle action bar actions click
switch (item.getItemId())
{
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private void buildFeed(int nodeType) throws JSONException {
// TODO Auto-generated method stub
getData(0);
arrayTemplist = new ArrayList<FeedItem>();
if(nodeType!=0){
for(int x=0;x<feedItems.size();x++)
{
int currentNodeType = feedItems.get(x).getNode_type();
if (nodeType == currentNodeType)
{
arrayTemplist.add(feedItems.get(x));
}
}
feedItems = arrayTemplist;
}
else{
}
populateListView(feedItems);
}
}
package com.sri.vaave；
导入java.io.UnsupportedEncodingException；
导入java.util.ArrayList；
导入java.util.Iterator；
导入java.util.List；
导入org.json.JSONException；
导入org.json.JSONObject；
导入android.app.Activity；
导入android.content.res.Configuration；
导入android.content.res.TypedArray；
导入android.graphics.Color；
导入android.graphics.drawable.ColorDrawable；
导入android.os.Bundle；
导入android.support.v4.app.ActionBarDrawerToggle；
导入android.support.v4.widget.DrawerLayout；
导入android.view.Menu；
导入android.view.MenuItem；
导入android.view.view；
导入android.widget.AdapterView；
导入android.widget.ListView；
导入android.widget.Toast；
导入com.android.volley.Cache；
导入com.android.volley.Cache.Entry；
导入com.android.volley.Request.Method；
导入com.android.volley.Response；
导入com.android.volley.VolleyError；
导入com.android.volley.VolleyLog；
导入com.android.volley.toolbox.JsonObjectRequest；
导入com.sri.vaave.adapter.FeedListAdapter；
导入com.sri.vaave.app.AppController；
导入com.sri.vaave.data.FeedItem；
公共类MainActivity扩展了活动{
私有静态最终字符串标记=MainActivity.class.getSimpleName（）；
私有列表视图列表视图；
专用FeedListAdapter；
私人物品清单；
私有列表arrayTemplist；
专用字符串URL_提要=”http://coherendz.net/vaavefeed1.json";
私人抽屉布局mDrawerLayout；
私有列表视图mDrawerList；
私有操作bardrawertoggle mDrawerToggle；
私人ArrayList NavWrites；
专用型雷达导航仪；
专用导航适配器；
//导航抽屉标题
私有字符序列mDrawerTitle；
//用于存储应用程序标题
私有字符序列mTitle；
//幻灯片菜单项
私有字符串[]navMenuTitles；
迭代器itr；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
//TODO自动生成的方法存根
feedItems=新的ArrayList（）；
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
试一试{
buildFeed（0）；
}捕获（JSONException e）{
//TODO自动生成的捕捉块
e、 printStackTrace（）；
}
getActionBar（）.setHomeButtonEnabled（true）；
getActionBar（）.setDisplayHomeAsUpEnabled（true）；
//这两条线不需要,，
//只是为了获得facebook的外观（更改背景颜色并隐藏图标）
getActionBar（）.setBackgroundDrawable（新的ColorDrawable（Color.parseColor（“#3b5998”））；
getActionBar（）.setIcon（
新的ColorDrawable（getResources（）.getColor（android.R.color.transparent））；
mTitle=mDrawerTitle=getTitle（）；
NavMenuTiles=getResources（）.getStringArray（R.array.Options）；
//参考资料中的导航抽屉图标
navMenuIcons=getResources（）
.obtainTypedArray（R.array.nav_drawer_图标）；
mDrawerLayout=（抽屉布局）findViewById（R.id.DroperLayout）；
mDrawerList=（ListView）findViewById（R.id.DroperList）；
navDrawerItems=新的ArrayList（）；
//将导航抽屉项添加到阵列
//家
添加（新的NavDrawerItem（navMenuTitles[0]，navMenuIcons.getResourceId（0，-1））；
//找人
添加（新的NavDrawerItem（navMenuTitles[1]，navMenuIcons.getResourceId（1，-1））；
//照片
添加（新的NavDrawerItem（navMenuTitles[2]，navMenuIcons.getResourceId（2，-1））；
//社区，将在此处添加一个计数器
添加（新的NavDrawerItem（navMenuTitles[3]，navMenuIcons.getResourceId（3，-1），true，“22”）；
//页数
add（新的NavDrawerItem（navMenuTitles[4]，navMenuIcons.getResourceId（4，-1））；
//什么是热的，我们将在这里加一个计数器
add（新的NavDrawerItem（navMenuTitles[5]，navMenuIcons.getResourceId（5，-1），true，“50+”））；
//全部
添加新的navDrawerItems（navMenuTitles[6
package com.sri.vaave.adapter;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.text.Html;
import android.text.TextUtils;
import android.text.method.LinkMovementMethod;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.NetworkImageView;
import com.sri.vaave.FeedImageView;
import com.sri.vaave.R;
import com.sri.vaave.app.AppController;
import com.sri.vaave.data.FeedItem;
public class FeedListAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private List<FeedItem> feedItems;
ImageLoader imageLoader = AppController.getInstance().getImageLoader();
public FeedListAdapter(Activity activity, List<FeedItem> feedItems) {
this.activity = activity;
this.feedItems = feedItems;
}
@Override
public int getCount() {
return feedItems.size();
}
@Override
public Object getItem(int location) {
return feedItems.get(location);
}
@Override
public long getItemId(int position) {
return position;
}
class MyViewHolder{
TextView name,timestamp,statusMsg,url;
NetworkImageView profilePic;
FeedImageView feedImageView;
@SuppressWarnings("unused")
MyViewHolder(View v){
TextView name = (TextView) v.findViewById(R.id.name);
TextView timestamp = (TextView) v
.findViewById(R.id.timestamp);
TextView statusMsg = (TextView) v
.findViewById(R.id.txtStatusMsg);
TextView url = (TextView)v.findViewById(R.id.txtUrl);
NetworkImageView profilePic = (NetworkImageView) v
.findViewById(R.id.profilePic);
FeedImageView feedImageView = (FeedImageView) v
.findViewById(R.id.feedImage1);
}
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
MyViewHolder holder = null;
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
{
convertView = inflater.inflate(R.layout.feed_item, null);
holder = new MyViewHolder(convertView);
convertView.setTag(holder);
}
else
{
holder = (MyViewHolder) convertView.getTag();
}
if (imageLoader == null)
imageLoader = AppController.getInstance().getImageLoader();
FeedItem item = feedItems.get(position);
holder.name.setText(item.getName());
// Converting timestamp into x ago format
/*CharSequence timeAgo = DateUtils.getRelativeTimeSpanString(
Long.parseLong(item.getReadable_date()),
System.currentTimeMillis(), DateUtils.SECOND_IN_MILLIS);*/
holder.timestamp.setText(item.getReadable_date());
// Chcek for empty status message
if (!TextUtils.isEmpty(item.getStatus())) {
holder.statusMsg.setText(Html.fromHtml(item.getStatus()));
holder.statusMsg.setVisibility(View.VISIBLE);
} else {
// status is empty, remove from view
holder.statusMsg.setVisibility(View.GONE);
}
// Checking for null feed url
if (item.getUrl() != null) {
holder.url.setText(Html.fromHtml("<a href=\"" + item.getUrl() + "\">"
+ item.getUrl() + "</a> "));
// Making url clickable
holder.url.setMovementMethod(LinkMovementMethod.getInstance());
holder.url.setVisibility(View.VISIBLE);
} else {
// url is null, remove from the view
holder.url.setVisibility(View.GONE);
}
// user profile pic
holder.profilePic.setImageUrl(item.getProfilePic(), imageLoader);
// Feed image
if (item.getImge() != null) {
holder.feedImageView.setImageUrl(item.getImge(), imageLoader);
holder.feedImageView.setVisibility(View.VISIBLE);
holder.feedImageView
.setResponseObserver(new FeedImageView.ResponseObserver() {
@Override
public void onError() {
}
@Override
public void onSuccess() {
}
});
} else {
holder.feedImageView.setVisibility(View.GONE);
}
return convertView;
}
}
package com.sri.vaave;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import com.android.volley.Cache;
import com.android.volley.Cache.Entry;
import com.android.volley.Request.Method;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonObjectRequest;
import com.sri.vaave.adapter.FeedListAdapter;
import com.sri.vaave.app.AppController;
import com.sri.vaave.data.FeedItem;
public class MainActivity extends Activity {
private static final String TAG = MainActivity.class.getSimpleName();
private ListView listView;
private FeedListAdapter listAdapter;
private List<FeedItem> feedItems;
private List<FeedItem> arrayTemplist;
private String URL_FEED = "http://coherendz.net/vaavefeed1.json";
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private ArrayList<NavDrawerItem> navDrawerItems;
private TypedArray navMenuIcons;
private NavDrawerListAdapter adapter;
// nav drawer title
private CharSequence mDrawerTitle;
// used to store app title
private CharSequence mTitle;
// slide menu items
private String[] navMenuTitles;
Iterator itr;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
feedItems = new ArrayList<FeedItem>();
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
buildFeed(0);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
getActionBar().setHomeButtonEnabled(true);
getActionBar().setDisplayHomeAsUpEnabled(true);
// These two lines not needed,
// just to get the look of facebook (changing background color & hiding the icon)
getActionBar().setBackgroundDrawable(new ColorDrawable(Color.parseColor("#3b5998")));
getActionBar().setIcon(
new ColorDrawable(getResources().getColor(android.R.color.transparent)));
mTitle = mDrawerTitle = getTitle();
navMenuTitles = getResources().getStringArray(R.array.Options);
// nav drawer icons from resources
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
mDrawerList = (ListView) findViewById(R.id.drawerList);
navDrawerItems = new ArrayList<NavDrawerItem>();
// adding nav drawer items to array
// Home
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
// Find People
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
// Photos
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
// Communities, Will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1), true, "22"));
// Pages
navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
// What's hot, We will add a counter here
navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1), true, "50+"));
// all
navDrawerItems.add(new NavDrawerItem(navMenuTitles[6], navMenuIcons.getResourceId(6, -1)));
// Recycle the typed array
navMenuIcons.recycle();
// setting the nav drawer list adapter
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
R.drawable.ic_drawer, //nav menu toggle icon
R.string.drawer_open, // nav drawer open - description for accessibility
R.string.drawer_close // nav drawer close - description for accessibility
)
{
public void onDrawerClosed(View view) {
getActionBar().setTitle(mTitle);
// calling onPrepareOptionsMenu() to show action bar icons
invalidateOptionsMenu();
}
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
// calling onPrepareOptionsMenu() to hide action bar icons
invalidateOptionsMenu();
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
}
private void populateFeedList() {
// TODO Auto-generated method stub
feedItems = getData(0);
//getData(0);
populateListView(feedItems);
}
private void populateListView(List dataFeed) {
// TODO Auto-generated method stub
// feedItems = new ArrayList<FeedItem>();
listAdapter = new FeedListAdapter(this, dataFeed);
listView = (ListView) findViewById(R.id.list);
listView.setAdapter(listAdapter);
listAdapter.notifyDataSetChanged();
}
/***
* Called when invalidateOptionsMenu() is triggered
*/
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if nav drawer is opened, hide the action items
boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
@Override
public void setTitle(CharSequence title) {
mTitle = title;
getActionBar().setTitle(mTitle);
}
/**
* Slide menu item click listener
* */
private class SlideMenuClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {// display view for selected nav drawer item
Toast.makeText(MainActivity.this,navMenuTitles[position]+" was selected", Toast.LENGTH_LONG).show();
setTitle(navMenuTitles[position]);
displayView(position);
mDrawerLayout.closeDrawer(mDrawerList);
}
private void displayView(int position) {
// TODO Auto-generated method stub
feedItems = new ArrayList<FeedItem>();
switch(position){
case 0: try {
buildFeed(0);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case 1: try {
buildFeed(7);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case 2: try {
buildFeed(1);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case 3: try {
buildFeed(13);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
case 4: try {
buildFeed(12);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
default:
try {
buildFeed(0);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
break;
}
}
}
private List getData(int nodeType) {
// TODO Auto-generated method stub
// We first check for cached request
Cache cache = AppController.getInstance().getRequestQueue().getCache();
Entry entry = cache.get(URL_FEED);
String data = null;
if (entry != null) {
// fetch the data from cache
try {
data = new String(entry.data, "UTF-8");
try {
parseJsonFeed(new JSONObject(data));
} catch (JSONException e) {
e.printStackTrace();
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
} else {
// making fresh volley request and getting json
JsonObjectRequest jsonReq = new JsonObjectRequest(Method.GET,
URL_FEED, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
VolleyLog.d(TAG, "Response: " + response.toString());
if (response != null) {
parseJsonFeed(response);
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
}
});
// Adding request to volley request queue
AppController.getInstance().addToRequestQueue(jsonReq);
}
return feedItems;
}
/**
* Parsing json reponse and passing the data to feed view list adapter
* */
private void parseJsonFeed(JSONObject response) {
FeedItem item;
itr = response.keys();
try
{
while(itr.hasNext())
{
String key = itr.next().toString();
JSONObject entry = response.getJSONObject(key);
JSONObject phone = entry.getJSONObject("basic");
String name = phone.getString("title");
String description = phone.getString("description");
int nodetype = phone.getInt("node_type");
JSONObject comments = entry.getJSONObject("comments");
String comments_count = comments.getString("count");
JSONObject like = entry.getJSONObject("likes");
String like_count = like.getString("count");
String readable_date = phone.getString("readable_date");
item = new FeedItem();
item.setNode_type(nodetype);
item.setName(String.valueOf(name));
item.setStatus(String.valueOf(description));
item.setReadable_date(String.valueOf(readable_date));
item.setComments_count(String.valueOf(comments_count));
item.setLike_count(String.valueOf(like_count));
feedItems.add(item);
}
}
catch (JSONException e)
{
e.printStackTrace();
}
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
// toggle nav drawer on selecting action bar app icon/title
if (mDrawerToggle.onOptionsItemSelected(item))
{
return true;
}
// Handle action bar actions click
switch (item.getItemId())
{
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private void buildFeed(int nodeType) throws JSONException {
// TODO Auto-generated method stub
getData(0);
arrayTemplist = new ArrayList<FeedItem>();
if(nodeType!=0){
for(int x=0;x<feedItems.size();x++)
{
int currentNodeType = feedItems.get(x).getNode_type();
if (nodeType == currentNodeType)
{
arrayTemplist.add(feedItems.get(x));
}
}
feedItems = arrayTemplist;
}
else{
}
populateListView(feedItems);
}
}