没有得到显示singleitem视图 [英] Nothing getting displayed in singleitem view
问题描述
我具有检索解析和显示信息到一个列表视图的应用程序,但是当应用程序被运行,并且单击列表视图项它会打开一个新的活动,并从parse.com显示一些图像和文字,但它显示什么像下面
图片
下面是我的code
主要activity.java
公共类MainActivity扩展活动
{
ListView控件列表视图;
清单<&的parseObject GT; OB;
ProgressDialog mProgressDialog;
FinalAdapter适配器;
私人列表< codeLIST> codeLIST = NULL;
@覆盖
保护无效的onCreate(捆绑savedInstanceState)
{
super.onCreate(savedInstanceState);
的setContentView(R.layout.beg_layout); 新RemoteDataTask()执行();
}私有类RemoteDataTask扩展的AsyncTask<太虚,太虚,太虚>
{
@覆盖
在preExecute保护无效(){
super.on preExecute();
//创建一个progressdialog
mProgressDialog =新ProgressDialog(MainActivity.this);
//设置progressdialog称号
mProgressDialog.setTitle(测试);
//设置progressdialog消息
mProgressDialog.setMessage(Loading请稍候,这可能需要一些时间......);
mProgressDialog.setIndeterminate(真);
//显示progressdialog
mProgressDialog.show();
}
@覆盖
保护无效doInBackground(无效... PARAMS)
{
codeLIST =新的ArrayList< codeLIST>();
尝试{
ParseQuery<&的parseObject GT;查询=新ParseQuery<&的parseObject GT;(
BeginnerActivity);
query.orderByAscending(_ created_at);
OB = query.find();
对于(的parseObject begactivity:OB){ ParseFile listimg =(ParseFile)begactivity.get(alphabetimg);
ParseFile levelimg =(ParseFile)begactivity.get(levelimg);
ParseFile apiimg =(ParseFile)begactivity.get(apiimg);
ParseFile descimgone =(ParseFile)begactivity.get(descimgone);
ParseFile descimgtwo =(ParseFile)begactivity.get(descimgtwo);
codeLIST地图=新的codeLIST();
map.setListHeading((字符串)begactivity.get(listheading));
map.setSingleItemHeading((字符串)begactivity.get(标题));
map.setDescription((字符串)begactivity.get(副标题));
map.setApiText((字符串)begactivity.get(apitext));
map.setFinal codeTEXT((字符串)begactivity.get(codeTEXT)); map.setAlphabetimg(listimg.getUrl());
map.setLevelImg(levelimg.getUrl());
map.setApiImg(apiimg.getUrl());
map.set previewImgOne(descimgone.getUrl());
map.set previewImgTwo(descimgtwo.getUrl());
codelist.add(图)
}
}赶上(ParseException的E){
Log.e(错误,e.getMessage());
e.printStackTrace(); }
返回null;
} @覆盖
保护无效onPostExecute(虚空结果){
//定位listview_main.xml列表视图
列表视图=(ListView控件)findViewById(R.id.beg_layoutListView);
//将结果传递到ListViewAdapter.java
适配器=新FinalAdapter(MainActivity.this,
codeLIST);
//绑定适配器到ListView
listview.setAdapter(适配器);
//关闭progressdialog
mProgressDialog.dismiss();
}}}
codelist.java
公共类codeLIST
{
私人字符串alphabetimg;
私人字符串listHeading;
私人字符串levelImg;
私人字符串singleItemHeading;
私人字符串描述;
私人字符串apiImg;
私人字符串apiText;私人字符串previewImgOne;
私人字符串previewImgTwo;
私人字符串最后codeTEXT;公共无效setAlphabetimg(字符串alphabetimg)
{
this.alphabetimg = alphabetimg;
}公共字符串getAlphabetimg()
{
返回alphabetimg;
}公共无效setListHeading(字符串listHeading)
{
this.listHeading = listHeading;
}公共字符串getListHeading()
{
返回listHeading;
}公共无效setLevelImg(字符串levelImg)
{
this.levelImg = levelImg;
}公共字符串getLevelImg()
{
返回levelImg;
}公共无效setSingleItemHeading(字符串singleItemHeading)
{
this.singleItemHeading = singleItemHeading;
}公共字符串getSingleItemHeading()
{
返回singleItemHeading;
}公共无效setDescription(字符串描述)
{
this.description =描述;
}公共字符串getDescription()
{
返回描述;
}公共无效setApiImg(字符串apiImg)
{
this.apiImg = apiImg;
}公共字符串getApiImg()
{
返回apiImg;
}公共无效setApiText(字符串apiText)
{
this.apiText = apiText;
}公共字符串getApiText()
{
返回apiText;
}
公共无效集previewImgOne(字符串previewImgOne)
{
这previewImgOne = previewImgOne。
}公共字符串获得previewImgOne()
{
返回previewImgOne;
}公共无效集previewImgTwo(字符串previewImgTwo)
{
这previewImgTwo = previewImgTwo。
}公共字符串的get previewImgTwo()
{
返回previewImgTwo;
}公共无效setFinal codeTEXT(字符串最后codeTEXT)
{
this.final codeTEXT =最终codeTEXT;
}公共字符串getFinal codeTEXT()
{
最后返回codeTEXT;
}}
解析application.java
公共类ParseApplication扩展应用{@覆盖
公共无效的onCreate(){
super.onCreate(); //此处添加您的初始code
Parse.initialize(这一点,4rOrqK23m0nVq187Of3rhDe0TK1R7FObdBWhfX10,afKA4B9ohvk3M9pZNv9qK2ypbrdOpXi0FPnrXOu6); ParseUser.enableAutomaticUser();
ParseACL defaultACL =新ParseACL(); //如果你想所有对象是默认私人,删除此行。
defaultACL.setPublicReadAccess(真); ParseACL.setDefaultACL(defaultACL,真);
} }
最后adapter.java
公共类FinalAdapter延伸BaseAdapter
{
上下文语境;
LayoutInflater吹气;
ImageLoader的ImageLoader的;
私人列表< codeLIST> codeLIST = NULL;
私人的ArrayList< codeLIST> ArrayList的;公共FinalAdapter(上下文的背景下,
清单< codeLIST> codeLIST){
this.context =背景;
这codeLIST = codeLIST;
充气= LayoutInflater.from(上下文);
this.arraylist =新的ArrayList< codeLIST>();
this.arraylist.addAll(codeLIST);
ImageLoader的=新ImageLoader的(上下文);}公共类ViewHolder {
TextView的listHeading;
ImageView的alphabetList;
}
@覆盖
公众诠释getCount将()
{
返回codeList.size();
}@覆盖
公共对象的getItem(INT位置)
{
返回codeList.get(位置);
}@覆盖
众长getItemId(INT位置)
{
返回的位置;
}@覆盖
公共查看getView(最终诠释的立场,观点来看,父母的ViewGroup)
{
最后ViewHolder持有人;
如果(查看== NULL){
持有人=新ViewHolder();
鉴于= inflater.inflate(R.layout.beg_list_item,NULL);
holder.listHeading =(TextView中)view.findViewById(R.id.beg_list_itemTextView);
holder.alphabetList =(ImageView的)view.findViewById(R.id.beg_list_itemImageView);
view.setTag(保持器); }其他{
支架=(ViewHolder)view.getTag();
}
holder.listHeading.setText(codeList.get(位置).getListHeading());
imageLoader.DisplayImage(codeList.get(位置).getAlphabetimg()
holder.alphabetList); view.setOnClickListener(新OnClickListener(){ @覆盖
公共无效的onClick(查看为arg0){
意向意图=新意图(背景下,SingleItemView.class); intent.putExtra(listheading
(codeList.get(位置).getListHeading()));
intent.putExtra(alphabetimg
(codeList.get(位置).getAlphabetimg()));
//开始SingleItemView类
context.startActivity(意向); }
}); 返回视图。
} }
singleitemview.java
公共类SingleItemView扩展了活动。
{
字符串标题;
串副标题;
串levelImg;
串apiImg;
串apiText;
串descImgOne;
串descImgTwo;
字符串codeTEXT;
ImageLoader的imgloader =新ImageLoader的(本);@覆盖
保护无效的onCreate(捆绑savedInstanceState)
{
super.onCreate(savedInstanceState);
的setContentView(R.layout.singleitemview); 意向I = getIntent(); 标题= i.getStringExtra(标题);
副标题= i.getStringExtra(副标题);
levelImg = i.getStringExtra(levelimg);
apiImg = i.getStringExtra(apiimg);
apiText = i.getStringExtra(apitext);
descImgOne = i.getStringExtra(descimgone);
descImgTwo = i.getStringExtra(descimgtwo);
codeTEXT = i.getStringExtra(codeTEXT);
TextView的headingtxt =(的TextView)findViewById(R.id.singleitemheading);
TextView的subheadingtxt =(的TextView)findViewById(R.id.singleitemsubheading);
TextView的apitxt =(的TextView)findViewById(R.id.singleitemviewapitext);
TextView的codetxt =(的TextView)findViewById(R.id.singleitemview codeTEXT); ImageView的水平=(ImageView的)findViewById(R.id.levelimg);
ImageView的API =(ImageView的)findViewById(R.id.singleitemviewapiimg);
ImageView的descone =(ImageView的)findViewById(R.id.descriptionimgone);
ImageView的desctwo =(ImageView的)findViewById(R.id.descriptionimgtwo); headingtxt.setText(航向);
subheadingtxt.setText(小标题);
apitxt.setText(apiText);
codetxt.setText(codeTEXT); imgloader.DisplayImage(levelImg,水平);
imgloader.DisplayImage(apiImg,API);
imgloader.DisplayImage(descImgOne,descone);
imgloader.DisplayImage(descImgTwo,desctwo);}
}
图片loaded.java
公共类ImageLoader的{的MemoryCache的MemoryCache =新的MemoryCache();
FileCache fileCache;
私人地图< ImageView的,字符串> imageViews =集合
.synchronizedMap(新的WeakHashMap< ImageView的,字符串>());
ExecutorService的ExecutorService的;
//处理程序,以显示在UI线程图片
处理程序处理程序=新的处理程序();公共ImageLoader的(上下文的背景下){
fileCache =新FileCache(背景);
ExecutorService的= Executors.newFixedThreadPool(5);
}最终诠释stub_id = R.drawable.temp_img;公共无效DisplayImage(字符串URL,ImageView的ImageView的){
imageViews.put(ImageView的,URL);
位图位图= memoryCache.get(URL);
如果(位图!= NULL)
imageView.setImageBitmap(位图);
其他{
queuePhoto(URL,ImageView的);
imageView.setImageResource(stub_id);
}
}私人无效queuePhoto(字符串URL,ImageView的ImageView的){
PhotoToLoad P =新PhotoToLoad(URL,ImageView的);
executorService.submit(新PhotosLoader(P));
}私人位图getBitmap(字符串URL){
文件F = fileCache.getFile(URL); 位图B =去codeFILE(F);
如果(B!= NULL)
返回b; 从网上下载//图片
尝试{
位图位图= NULL;
URL =图片网址新的URL(网址);
HttpURLConnection的康恩=(HttpURLConnection类)图片网址
.openConnection();
conn.setConnectTimeout(30000);
conn.setReadTimeout(30000);
conn.setInstanceFollowRedirects(真);
InputStream为= conn.getInputStream();
OutputStream的OS =新的FileOutputStream(F);
Utils.CopyStream(是,OS);
os.close();
conn.disconnect();
位=去codeFILE(F);
返回位图;
}赶上(Throwable的前){
ex.printStackTrace();
如果(前的instanceof的OutOfMemoryError)
memoryCache.clear();
返回null;
}
}//德$ C $连拍影像的鳞它来减少内存消耗
私人位图德codeFILE(文件f){
尝试{
//德code图像尺寸
BitmapFactory.Options O =新BitmapFactory.Options();
o.inJustDe codeBounds = TRUE;
的FileInputStream流1 =新的FileInputStream(F);
BitmapFactory.de codeStream(STREAM1,空,O);
stream1.close(); //找到正确的比例值。它应该是2的幂。
最终诠释REQUIRED_SIZE = 70;
INT width_tmp = o.outWidth,height_tmp = o.outHeight;
int标= 1;
而(真){
如果(width_tmp / 2'; REQUIRED_SIZE
|| height_tmp / 2'; REQUIRED_SIZE)
打破;
width_tmp / = 2;
height_tmp / = 2;
规模* = 2;
} //德code。与inSampleSize
BitmapFactory.Options O2 =新BitmapFactory.Options();
o2.inSampleSize =规模;
流2的FileInputStream =新的FileInputStream(F);
位图位图= BitmapFactory.de codeStream(流2,空,O2);
stream2.close();
返回位图;
}赶上(FileNotFoundException异常五){
}赶上(IOException异常五){
e.printStackTrace();
}
返回null;
}//任务队列
私有类PhotoToLoad {
公共字符串的URL;
公共ImageView的ImageView的; 公共PhotoToLoad(字符串U,ImageView的我){
URL = U;
ImageView的= I;
}
}类PhotosLoader实现Runnable {
PhotoToLoad photoToLoad; PhotosLoader(PhotoToLoad photoToLoad){
this.photoToLoad = photoToLoad;
} @覆盖
公共无效的run(){
尝试{
如果(imageViewReused(photoToLoad))
返回;
BMP位图= getBitmap(photoToLoad.url);
memoryCache.put(photoToLoad.url,BMP);
如果(imageViewReused(photoToLoad))
返回;
BitmapDisplayer BD =新BitmapDisplayer(BMP,photoToLoad);
handler.post(BD);
}赶上(的Throwable日){
th.printStackTrace();
}
}
}布尔imageViewReused(PhotoToLoad photoToLoad){
字符串标记= imageViews.get(photoToLoad.imageView);
如果(标记== NULL ||!tag.equals(photoToLoad.url))
返回true;
返回false;
}//用在UI线程来显示位图
类BitmapDisplayer实现Runnable {
位图位图;
PhotoToLoad photoToLoad; 公共BitmapDisplayer(位图B,PhotoToLoad P){
位= B;
photoToLoad = P;
} 公共无效的run(){
如果(imageViewReused(photoToLoad))
返回;
如果(位图!= NULL)
photoToLoad.imageView.setImageBitmap(位图);
其他
photoToLoad.imageView.setImageResource(stub_id);
}
}公共无效clearCache(){
memoryCache.clear();
fileCache.clear();
}}
filecache.java
公共类FileCache {私人文件cacheDir;公共FileCache(上下文的背景下){
//查找目录保存缓存图像
如果(android.os.Environment.getExternalStorageState()。等于(
android.os.Environment.MEDIA_MOUNTED))
cacheDir =新的文件(
android.os.Environment.getExternalStorageDirectory(),
ImgTxt);
其他
cacheDir = context.getCacheDir();
如果(!cacheDir.exists())
cacheDir.mkdirs();
}公开文件的GetFile(字符串URL){
字符串文件名=将String.valueOf(url.hash code());
//字符串文件名= URLEn coder.en code(URL);
文件f =新的文件(cacheDir,文件名);
返回F;}公共无效清除(){
文件[] =文件cacheDir.listFiles();
如果(文件== NULL)
返回;
对于(F文件:文件)
f.delete();
}
}
memorycache.java
公共类的MemoryCache {私有静态最后弦乐TAG =的MemoryCache;//最后一个参数如此LRU排序
私人地图<弦乐,位图>缓存=集合
.synchronizedMap(新LinkedHashMap的<弦乐,位图>(10,1.5F,真实));//当前分配的大小
私人长期的大小= 0;//最大内存字节
私人长期限制= 1000000;公众的MemoryCache(){
//使用可用堆大小的25%
setLimit(调用Runtime.getRuntime()maxMemory()/ 4);
}公共无效setLimit(长NEW_LIMIT){
极限= NEW_LIMIT;
Log.i(TAG的MemoryCache会使用到限+ / 1024/1024 +MB);
}公共位图的get(字符串ID){
尝试{
如果(!cache.containsKey(ID))
返回null;
返回cache.get(ID);
}赶上(NullPointerException异常前){
ex.printStackTrace();
返回null;
}
}公共无效认沽(字符串ID,位图位图){
尝试{
如果(cache.containsKey(ID))
大小 - = getSizeInBytes(cache.get(ID));
cache.put(ID,位图);
大小+ = getSizeInBytes(位图);
checkSize();
}赶上(的Throwable日){
th.printStackTrace();
}
}私人无效checkSize(){
Log.i(TAG,高速缓存大小=+尺寸+长度=+ cache.size());
如果(大小>限制){
//最近最少访问的项目将是第一个迭代
迭代器<钥匙进入LT;弦乐,位图>> ITER = cache.entrySet()迭代器()。
而(iter.hasNext()){
进入<弦乐,位图>条目= iter.next();
大小 - = getSizeInBytes(entry.getValue());
iter.remove();
如果(大小< =极限)
打破;
}
Log.i(TAG,清洁缓存新的大小。+ cache.size());
}
}公共无效清除(){
尝试{
cache.clear();
大小= 0;
}赶上(NullPointerException异常前){
ex.printStackTrace();
}
}长getSizeInBytes(位图位图){
如果(位图== NULL)
返回0;
返回bitmap.getRowBytes()* bitmap.getHeight();
}
}
安卓的manifest.xml
<?XML版本=1.0编码=UTF-8&GT?;
<清单的xmlns:机器人=http://schemas.android.com/apk/res/android
包=com.mycompany.myapp><使用许可权的android:NAME =android.permission.INTERNET对/>
<使用许可权的android:NAME =android.permission.WRITE_EXTERNAL_STORAGE/><应用
机器人:名字=ParseApplication
机器人:allowBackup =真
机器人:图标=@绘制/ ic_launcher
机器人:标签=@字符串/ APP_NAME
机器人:主题=@风格/ AppTheme>
<活动
机器人:名字=。MainActivity
机器人:标签=@字符串/ APP_NAME>
&所述;意图滤光器>
<作用机器人:名字=android.intent.action.MAIN/> <类机器人:名字=android.intent.category.LAUNCHER/>
&所述; /意图滤光器>
< /活性GT;
<活动
机器人:名字=SingleItemView。>
< /活性GT;
< /用途>< /清单>
在onclicklistener()添加此code
intent.putExtra(levelimg
(codeList.get(位置).getLevelImg())); intent.putExtra(标题,
(codeList.get(位置).getSingleItemHeading())); intent.putExtra(副标题
(codeList.get(位置).getDescription())); intent.putExtra(apitext
(codeList.get(位置).getApiText())); intent.putExtra(apiimg
(codeList.get(位置).getApiImg())); intent.putExtra(descimgone
(codeList.get(位置)。获得previewImgOne())); intent.putExtra(descimgtwo
(codeList.get(位置)。获得previewImgTwo())); intent.putExtra(codeTEXT
(codeList.get(位置).getFinal codeTEXT()));
I am having an app that retrieves information from parse and display into a list view ,but when the app is run and the list view item is clicked it opens a new activity and display some images and text from parse.com but it shows nothing like the image below
Here is my code
main activity.java
public class MainActivity extends Activity
{
ListView listview;
List<ParseObject> ob;
ProgressDialog mProgressDialog;
FinalAdapter adapter;
private List<CodeList> codelist = null;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.beg_layout);
new RemoteDataTask().execute();
}
private class RemoteDataTask extends AsyncTask<Void, Void, Void>
{
@Override
protected void onPreExecute() {
super.onPreExecute();
// Create a progressdialog
mProgressDialog = new ProgressDialog(MainActivity.this);
// Set progressdialog title
mProgressDialog.setTitle("Testing");
// Set progressdialog message
mProgressDialog.setMessage("Loading. Please wait this may take few moments ....");
mProgressDialog.setIndeterminate(true);
// Show progressdialog
mProgressDialog.show();
}
@Override
protected Void doInBackground(Void... params)
{
codelist = new ArrayList<CodeList>();
try{
ParseQuery<ParseObject> query = new ParseQuery<ParseObject>(
"BeginnerActivity");
query.orderByAscending("_created_at");
ob = query.find();
for(ParseObject begactivity : ob){
ParseFile listimg = (ParseFile) begactivity.get("alphabetimg");
ParseFile levelimg = (ParseFile) begactivity.get("levelimg");
ParseFile apiimg = (ParseFile) begactivity.get("apiimg");
ParseFile descimgone = (ParseFile) begactivity.get("descimgone");
ParseFile descimgtwo = (ParseFile) begactivity.get("descimgtwo");
CodeList map = new CodeList();
map.setListHeading((String) begactivity.get("listheading"));
map.setSingleItemHeading((String) begactivity.get("heading"));
map.setDescription((String) begactivity.get("subheading"));
map.setApiText((String) begactivity.get("apitext"));
map.setFinalCodeText((String) begactivity.get("codetext"));
map.setAlphabetimg(listimg.getUrl());
map.setLevelImg(levelimg.getUrl());
map.setApiImg(apiimg.getUrl());
map.setPreviewImgOne(descimgone.getUrl());
map.setPreviewImgTwo(descimgtwo.getUrl());
codelist.add(map);
}
}catch(ParseException e){
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
// Locate the listview in listview_main.xml
listview = (ListView) findViewById(R.id.beg_layoutListView);
// Pass the results into ListViewAdapter.java
adapter = new FinalAdapter(MainActivity.this,
codelist);
// Binds the Adapter to the ListView
listview.setAdapter(adapter);
// Close the progressdialog
mProgressDialog.dismiss();
}
}
}
codelist.java
public class CodeList
{
private String alphabetimg;
private String listHeading;
private String levelImg;
private String singleItemHeading;
private String description;
private String apiImg;
private String apiText;
private String previewImgOne;
private String previewImgTwo;
private String finalCodeText;
public void setAlphabetimg(String alphabetimg)
{
this.alphabetimg = alphabetimg;
}
public String getAlphabetimg()
{
return alphabetimg;
}
public void setListHeading(String listHeading)
{
this.listHeading = listHeading;
}
public String getListHeading()
{
return listHeading;
}
public void setLevelImg(String levelImg)
{
this.levelImg = levelImg;
}
public String getLevelImg()
{
return levelImg;
}
public void setSingleItemHeading(String singleItemHeading)
{
this.singleItemHeading = singleItemHeading;
}
public String getSingleItemHeading()
{
return singleItemHeading;
}
public void setDescription(String description)
{
this.description = description;
}
public String getDescription()
{
return description;
}
public void setApiImg(String apiImg)
{
this.apiImg = apiImg;
}
public String getApiImg()
{
return apiImg;
}
public void setApiText(String apiText)
{
this.apiText = apiText;
}
public String getApiText()
{
return apiText;
}
public void setPreviewImgOne(String previewImgOne)
{
this.previewImgOne = previewImgOne;
}
public String getPreviewImgOne()
{
return previewImgOne;
}
public void setPreviewImgTwo(String previewImgTwo)
{
this.previewImgTwo = previewImgTwo;
}
public String getPreviewImgTwo()
{
return previewImgTwo;
}
public void setFinalCodeText(String finalCodeText)
{
this.finalCodeText = finalCodeText;
}
public String getFinalCodeText()
{
return finalCodeText;
}
}
parse application.java
public class ParseApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
// Add your initialization code here
Parse.initialize(this, "4rOrqK23m0nVq187Of3rhDe0TK1R7FObdBWhfX10", "afKA4B9ohvk3M9pZNv9qK2ypbrdOpXi0FPnrXOu6");
ParseUser.enableAutomaticUser();
ParseACL defaultACL = new ParseACL();
// If you would like all objects to be private by default, remove this line.
defaultACL.setPublicReadAccess(true);
ParseACL.setDefaultACL(defaultACL, true);
}
}
final adapter.java
public class FinalAdapter extends BaseAdapter
{
Context context;
LayoutInflater inflater;
ImageLoader imageLoader;
private List<CodeList> codeList = null;
private ArrayList<CodeList> arraylist;
public FinalAdapter(Context context,
List<CodeList> codeList) {
this.context = context;
this.codeList = codeList;
inflater = LayoutInflater.from(context);
this.arraylist = new ArrayList<CodeList>();
this.arraylist.addAll(codeList);
imageLoader = new ImageLoader(context);
}
public class ViewHolder{
TextView listHeading;
ImageView alphabetList;
}
@Override
public int getCount()
{
return codeList.size();
}
@Override
public Object getItem(int position)
{
return codeList.get(position);
}
@Override
public long getItemId(int position)
{
return position;
}
@Override
public View getView(final int position, View view, ViewGroup parent)
{
final ViewHolder holder;
if(view == null){
holder = new ViewHolder();
view = inflater.inflate(R.layout.beg_list_item,null);
holder.listHeading = (TextView) view.findViewById(R.id.beg_list_itemTextView);
holder.alphabetList = (ImageView) view.findViewById(R.id.beg_list_itemImageView);
view.setTag(holder);
}else{
holder = (ViewHolder) view.getTag();
}
holder.listHeading.setText(codeList.get(position).getListHeading());
imageLoader.DisplayImage(codeList.get(position).getAlphabetimg(),
holder.alphabetList);
view.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View arg0){
Intent intent = new Intent(context, SingleItemView.class);
intent.putExtra("listheading",
(codeList.get(position).getListHeading()));
intent.putExtra("alphabetimg",
(codeList.get(position).getAlphabetimg()));
// Start SingleItemView Class
context.startActivity(intent);
}
});
return view;
}
}
singleitemview.java
public class SingleItemView extends Activity.
{
String heading;
String subHeading;
String levelImg;
String apiImg;
String apiText;
String descImgOne;
String descImgTwo;
String codeText;
ImageLoader imgloader = new ImageLoader(this);
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.singleitemview);
Intent i = getIntent();
heading= i.getStringExtra("heading");
subHeading = i.getStringExtra("subheading");
levelImg = i.getStringExtra("levelimg");
apiImg = i.getStringExtra("apiimg");
apiText = i.getStringExtra("apitext");
descImgOne = i.getStringExtra("descimgone");
descImgTwo = i.getStringExtra("descimgtwo");
codeText = i.getStringExtra("codetext");
TextView headingtxt = (TextView)findViewById(R.id.singleitemheading);
TextView subheadingtxt = (TextView)findViewById(R.id.singleitemsubheading);
TextView apitxt = (TextView)findViewById(R.id.singleitemviewapitext);
TextView codetxt = (TextView) findViewById(R.id.singleitemviewcodetext);
ImageView level =(ImageView) findViewById(R.id.levelimg);
ImageView api =(ImageView) findViewById(R.id.singleitemviewapiimg);
ImageView descone =(ImageView) findViewById(R.id.descriptionimgone);
ImageView desctwo =(ImageView) findViewById(R.id.descriptionimgtwo);
headingtxt.setText(heading);
subheadingtxt.setText(subHeading);
apitxt.setText(apiText);
codetxt.setText(codeText);
imgloader.DisplayImage(levelImg, level);
imgloader.DisplayImage(apiImg, api);
imgloader.DisplayImage(descImgOne, descone);
imgloader.DisplayImage(descImgTwo, desctwo);
}
}
image loaded.java
public class ImageLoader {
MemoryCache memoryCache = new MemoryCache();
FileCache fileCache;
private Map<ImageView, String> imageViews = Collections
.synchronizedMap(new WeakHashMap<ImageView, String>());
ExecutorService executorService;
// Handler to display images in UI thread
Handler handler = new Handler();
public ImageLoader(Context context) {
fileCache = new FileCache(context);
executorService = Executors.newFixedThreadPool(5);
}
final int stub_id = R.drawable.temp_img;
public void DisplayImage(String url, ImageView imageView) {
imageViews.put(imageView, url);
Bitmap bitmap = memoryCache.get(url);
if (bitmap != null)
imageView.setImageBitmap(bitmap);
else {
queuePhoto(url, imageView);
imageView.setImageResource(stub_id);
}
}
private void queuePhoto(String url, ImageView imageView) {
PhotoToLoad p = new PhotoToLoad(url, imageView);
executorService.submit(new PhotosLoader(p));
}
private Bitmap getBitmap(String url) {
File f = fileCache.getFile(url);
Bitmap b = decodeFile(f);
if (b != null)
return b;
// Download Images from the Internet
try {
Bitmap bitmap = null;
URL imageUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) imageUrl
.openConnection();
conn.setConnectTimeout(30000);
conn.setReadTimeout(30000);
conn.setInstanceFollowRedirects(true);
InputStream is = conn.getInputStream();
OutputStream os = new FileOutputStream(f);
Utils.CopyStream(is, os);
os.close();
conn.disconnect();
bitmap = decodeFile(f);
return bitmap;
} catch (Throwable ex) {
ex.printStackTrace();
if (ex instanceof OutOfMemoryError)
memoryCache.clear();
return null;
}
}
// Decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f) {
try {
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
FileInputStream stream1 = new FileInputStream(f);
BitmapFactory.decodeStream(stream1, null, o);
stream1.close();
// Find the correct scale value. It should be the power of 2.
final int REQUIRED_SIZE = 70;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < REQUIRED_SIZE
|| height_tmp / 2 < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
FileInputStream stream2 = new FileInputStream(f);
Bitmap bitmap = BitmapFactory.decodeStream(stream2, null, o2);
stream2.close();
return bitmap;
} catch (FileNotFoundException e) {
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
// Task for the queue
private class PhotoToLoad {
public String url;
public ImageView imageView;
public PhotoToLoad(String u, ImageView i) {
url = u;
imageView = i;
}
}
class PhotosLoader implements Runnable {
PhotoToLoad photoToLoad;
PhotosLoader(PhotoToLoad photoToLoad) {
this.photoToLoad = photoToLoad;
}
@Override
public void run() {
try {
if (imageViewReused(photoToLoad))
return;
Bitmap bmp = getBitmap(photoToLoad.url);
memoryCache.put(photoToLoad.url, bmp);
if (imageViewReused(photoToLoad))
return;
BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad);
handler.post(bd);
} catch (Throwable th) {
th.printStackTrace();
}
}
}
boolean imageViewReused(PhotoToLoad photoToLoad) {
String tag = imageViews.get(photoToLoad.imageView);
if (tag == null || !tag.equals(photoToLoad.url))
return true;
return false;
}
// Used to display bitmap in the UI thread
class BitmapDisplayer implements Runnable {
Bitmap bitmap;
PhotoToLoad photoToLoad;
public BitmapDisplayer(Bitmap b, PhotoToLoad p) {
bitmap = b;
photoToLoad = p;
}
public void run() {
if (imageViewReused(photoToLoad))
return;
if (bitmap != null)
photoToLoad.imageView.setImageBitmap(bitmap);
else
photoToLoad.imageView.setImageResource(stub_id);
}
}
public void clearCache() {
memoryCache.clear();
fileCache.clear();
}
}
filecache.java
public class FileCache {
private File cacheDir;
public FileCache(Context context) {
// Find the dir to save cached images
if (android.os.Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED))
cacheDir = new File(
android.os.Environment.getExternalStorageDirectory(),
"ImgTxt");
else
cacheDir = context.getCacheDir();
if (!cacheDir.exists())
cacheDir.mkdirs();
}
public File getFile(String url) {
String filename = String.valueOf(url.hashCode());
// String filename = URLEncoder.encode(url);
File f = new File(cacheDir, filename);
return f;
}
public void clear() {
File[] files = cacheDir.listFiles();
if (files == null)
return;
for (File f : files)
f.delete();
}
}
memorycache.java
public class MemoryCache {
private static final String TAG = "MemoryCache";
// Last argument true for LRU ordering
private Map<String, Bitmap> cache = Collections
.synchronizedMap(new LinkedHashMap<String, Bitmap>(10, 1.5f, true));
// Current allocated size
private long size = 0;
// Max memory in bytes
private long limit = 1000000;
public MemoryCache() {
// Use 25% of available heap size
setLimit(Runtime.getRuntime().maxMemory() / 4);
}
public void setLimit(long new_limit) {
limit = new_limit;
Log.i(TAG, "MemoryCache will use up to " + limit / 1024. / 1024. + "MB");
}
public Bitmap get(String id) {
try {
if (!cache.containsKey(id))
return null;
return cache.get(id);
} catch (NullPointerException ex) {
ex.printStackTrace();
return null;
}
}
public void put(String id, Bitmap bitmap) {
try {
if (cache.containsKey(id))
size -= getSizeInBytes(cache.get(id));
cache.put(id, bitmap);
size += getSizeInBytes(bitmap);
checkSize();
} catch (Throwable th) {
th.printStackTrace();
}
}
private void checkSize() {
Log.i(TAG, "cache size=" + size + " length=" + cache.size());
if (size > limit) {
// Least recently accessed item will be the first one iterated
Iterator<Entry<String, Bitmap>> iter = cache.entrySet().iterator();
while (iter.hasNext()) {
Entry<String, Bitmap> entry = iter.next();
size -= getSizeInBytes(entry.getValue());
iter.remove();
if (size <= limit)
break;
}
Log.i(TAG, "Clean cache. New size " + cache.size());
}
}
public void clear() {
try {
cache.clear();
size = 0;
} catch (NullPointerException ex) {
ex.printStackTrace();
}
}
long getSizeInBytes(Bitmap bitmap) {
if (bitmap == null)
return 0;
return bitmap.getRowBytes() * bitmap.getHeight();
}
}
android manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mycompany.myapp" >
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:name="ParseApplication"
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".SingleItemView">
</activity>
</application>
</manifest>
In the onclicklistener() add this code
intent.putExtra("levelimg",
(codeList.get(position).getLevelImg()));
intent.putExtra("heading",
(codeList.get(position).getSingleItemHeading()));
intent.putExtra("subheading",
(codeList.get(position).getDescription()));
intent.putExtra("apitext",
(codeList.get(position).getApiText()));
intent.putExtra("apiimg",
(codeList.get(position).getApiImg()));
intent.putExtra("descimgone",
(codeList.get(position).getPreviewImgOne()));
intent.putExtra("descimgtwo",
(codeList.get(position).getPreviewImgTwo()));
intent.putExtra("codetext",
(codeList.get(position).getFinalCodeText()));
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