如何从web android获取图像 [英] How to get an image from the web android
本文介绍了如何从web android获取图像的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用RSS提要处理新闻android项目，我的应用程序现在可以获取标题，描述，新闻时间，但我无法获得图片它向我显示错误：我不知道我犯了什么罪！请求帮助>>>这是任何地方的错误：
I'm working on news android project using RSS feed, my app now can get title,description,time of news perfictly but Ican't get the Image it show me that error: I do not know where I sinned ! Ineed help please >>> this is the error anywhere :
java.lang.NullPointerException: uriString
at android.net.Uri$StringUri.<init>(Uri.java:464)
at android.net.Uri$StringUri.<init>(Uri.java:454)
at android.net.Uri.parse(Uri.java:426)
at com.example.drmzr.myapplication.MyAdapter.onBindViewHolder(MyAdapter.java:36)
at com.example.drmzr.myapplication.MyAdapter.onBindViewHolder(MyAdapter.java:12)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:5453)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:5486)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:4723)
这是我的代码（我的Article.java）：
this is my code (my Article.java) :
public class Article {
String title,description,date,link,image;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getImage() {
return image;
}
public void setImage(String image) {
this.image = image;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public String getLink() {
return link;
}
public void setLink(String link) {
this.link = link;
}
}
这是（我的Adapter.java）：
}
this is (my Adapter.java) :
public class MyAdapter extends RecyclerView.Adapter<MyHolder> {
Context c;
ArrayList<Article> articles;
public MyAdapter(Context c, ArrayList<Article> articles) {
this.c = c;
this.articles = articles;
}
@Override
public MyHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v= LayoutInflater.from(c).inflate(R.layout.model,parent,false);
return new MyHolder(v);
}
@Override
public void onBindViewHolder(MyHolder holder, int position) {
Article article=articles.get(position);
holder.titleTxt.setText(article.getTitle());
holder.descTxt.setText(article.getDescription());
holder.dateTxt.setText(article.getDate());
holder.gimage.setImageURI(Uri.parse(article.getImage())) ;
}
@Override
public int getItemCount() {
return articles.size();
}
这是继续上述错误的行（holder.gimage.setImageURI（Uri.parse（article.getImage（）））;）这是（我的RSSParser.java）：
this the line that contints the above error (holder.gimage.setImageURI(Uri.parse(article.getImage())) ;) this is (my RSSParser.java) :
public class RSSParser extends AsyncTask<Void,Void,Boolean> {
Context c;
InputStream is;
RecyclerView rv;
ProgressDialog pd;
ArrayList<Article> articles=new ArrayList<>();
public RSSParser(Context c, InputStream is, RecyclerView rv) {
this.c = c;
this.is = is;
this.rv = rv;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
pd=new ProgressDialog(c);
pd.setTitle("Parse data");
pd.setMessage("Parsing data...Please wait");
pd.show();
}
@Override
protected Boolean doInBackground(Void... params) {
return this.parseRSS();
}
@Override
protected void onPostExecute(Boolean isParsed) {
super.onPostExecute(isParsed);
pd.dismiss();
if(isParsed)
{
//Bind
rv.setAdapter(new MyAdapter(c,articles));
}else {
Toast.makeText(c,"Unable To Parse", Toast.LENGTH_SHORT).show();
}
}
private Boolean parseRSS()
{
try
{
XmlPullParserFactory factory=XmlPullParserFactory.newInstance();
XmlPullParser parser=factory.newPullParser();
parser.setInput(is, null);
int event=parser.getEventType();
String value=null;
articles.clear();
Article article=new Article();
do {
String name=parser.getName();
switch (event)
{
case XmlPullParser.START_TAG:
if(name.equals("item"))
{
article=new Article();
}
break;
case XmlPullParser.TEXT:
value=parser.getText();
break;
case XmlPullParser.END_TAG:
if(name.equals("title"))
{
article.setTitle(value);
}
else if(name.equals("description"))
{
article.setDescription(value);
}else if(name.equals("pubDate"))
{
article.setDate(value);
}else if(name.equals("date"))
{
article.setDate(value);
}else if(name.equals("image"))
{
article.setImage(value) ;
}
if(name.equals("item"))
{
articles.add(article);
}
break;
}
event=parser.next();
}while (event != XmlPullParser.END_DOCUMENT);
return true;
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return false;
})
我尝试过：
我在代码中尝试了一些代码！
What I have tried:
I have tried some code it is inside the code !
推荐答案
StringUri。< init>（Uri.java:464）
在android.net.Uri
StringUri.<init>(Uri.java:464) at android.net.Uri
StringUri。< init>（Uri.java:454）
在android.net.Uri.parse（Uri.java:426） ）
at com.example.drmzr.myapplication.MyAdapter.onBindViewHolder（MyAdapter.java:36）
at com.example.drmzr.myapplication.MyAdapter.onBindViewHolder（MyAdapter.java:12）
在android.support.v7.widget.RecyclerView
StringUri.<init>(Uri.java:454) at android.net.Uri.parse(Uri.java:426) at com.example.drmzr.myapplication.MyAdapter.onBindViewHolder(MyAdapter.java:36) at com.example.drmzr.myapplication.MyAdapter.onBindViewHolder(MyAdapter.java:12) at android.support.v7.widget.RecyclerView
Adapter.onB indViewHolder（RecyclerView.java:5453）
在android.support.v7.widget.RecyclerView
Adapter.onBindViewHolder(RecyclerView.java:5453) at android.support.v7.widget.RecyclerView
这篇关于如何从web android获取图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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