Question

在我的ArrayAdapter中，我在logcat中收到此错误：

01-21 18:34:21.705: E/AndroidRuntime(10863): FATAL EXCEPTION: main
01-21 18:34:21.705: E/AndroidRuntime(10863): Process: it.rs.esempioparsinglistview, PID: 10863
01-21 18:34:21.705: E/AndroidRuntime(10863): java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
01-21 18:34:21.705: E/AndroidRuntime(10863):    at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at java.util.ArrayList.get(ArrayList.java:308)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at it.rs.esempioparsinglistview.ParsingArrayAdapter.getView(ParsingArrayAdapter.java:80)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.widget.AbsListView.obtainView(AbsListView.java:2263)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.widget.ListView.measureHeightOfChildren(ListView.java:1263)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.widget.ListView.onMeasure(ListView.java:1175)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.View.measure(View.java:16504)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.View.measure(View.java:16504)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.View.measure(View.java:16504)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:327)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.View.measure(View.java:16504)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2552)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.View.measure(View.java:16504)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1916)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1113)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1295)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5670)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.Choreographer.doCallbacks(Choreographer.java:574)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.Choreographer.doFrame(Choreographer.java:544)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.os.Handler.handleCallback(Handler.java:733)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.os.Handler.dispatchMessage(Handler.java:95)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.os.Looper.loop(Looper.java:136)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at android.app.ActivityThread.main(ActivityThread.java:5081)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at java.lang.reflect.Method.invoke(Native Method)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:781)
01-21 18:34:21.705: E/AndroidRuntime(10863):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)

第80行是这样的：

cache.immagini.setImageBitmap(bitmap.get(pos));

中的

：

public View getView(int pos,View view,ViewGroup parent)
    {
        CacheRiga cache; //cache
        if(view==null)//se è la prima volta che viene richiesta la view
        {
            // creo la view ma non l'attacco alla lista in quanto devo ancora modificare
            // i testi delle textview
            view = inflater.inflate(LAYOUT, parent,false); 
            cache = new CacheRiga(); //inizializzo la cache
            cache.titolo = (TextView) view.findViewById(TITOLO); //collego titolo

            cache.immagini = (ImageView) view.findViewById(IMMAGINE);//collego descrizione


            view.setTag(cache);//collego view con cache
        }
        else
        {
            cache = (CacheRiga) view.getTag(); //altrimenti prendo la cache dalla view
        }

        cache.titolo.setText(titoli.get(pos)); //set the title

        cache.immagini.setImageBitmap(bitmap.get(pos)); //set the image


        if (bitmap!=null){
            Log.d("Bitmap MP.it", "BitmapNOTnull");         
        }else{
            Log.d("Bitmap null MP.it", "Bitmapnull");    
        }
        return view;
    }

事实上，如果我评论该行我没有得到错误，但我无法在列表中显示图像..为什么会出现这个错误？如何在列表中插入位图？

完全适配器

public class ParsingArrayAdapter extends ArrayAdapter<String>{

    //riferimenti statici alle risorse e agli id
    private final static int LAYOUT = R.layout.riga_listview;
    private final static int TITOLO = R.id.riga_listview_titolo;
    private final static int IMMAGINE = R.id.imageView1;

    List<Bitmap> bitmap ; 

    ArrayList<String> titoli; //lista dei titoli

    Context c; //context
    LayoutInflater inflater; //layout inflater


    public ParsingArrayAdapter(Context context,ArrayList<String> titoli, List<Bitmap> bitmap)
    {
        super(context,TITOLO);
        this.c = context;
        this.titoli = titoli;
        this.bitmap = bitmap;
        this.inflater = LayoutInflater.from(c);
    }

    @Override
    public int getCount()
    {
        return titoli.size(); //ritorno lunghezza lista ( = numero dei titoli)
    }

    //quando la lista richiede una view
    @SuppressLint("NewApi")
    @Override
    public View getView(int pos,View view,ViewGroup parent)
    {
        CacheRiga cache; //cache
        if(view==null)//se è la prima volta che viene richiesta la view
        {
            // creo la view ma non l'attacco alla lista in quanto devo ancora modificare
            // i testi delle textview
            view = inflater.inflate(LAYOUT, parent,false); 
            cache = new CacheRiga(); //inizializzo la cache
            cache.titolo = (TextView) view.findViewById(TITOLO); //collego titolo

            cache.immagini = (ImageView) view.findViewById(IMMAGINE);//collego descrizione


            view.setTag(cache);//collego view con cache
        }
        else
        {
            cache = (CacheRiga) view.getTag(); //altrimenti prendo la cache dalla view
        }

        cache.titolo.setText(titoli.get(pos)); //imposto il titolo

        cache.immagini.setImageBitmap(bitmap.get(pos));


        if (bitmap!=null){
            Log.d("Bitmap MP.it", "BitmapNOTnull");         
        }else{
            Log.d("Bitmap null MP.it", "Bitmapnull");    
        }
        return view;
    }

    private class CacheRiga { // classe per la cache delle righe
        public TextView titolo; // cache titolo
        public ImageView immagini; // cache images
    }

}

MAINACTIVITY：

public class MainActivity extends Activity{
    ProgressDialog mProgressDialog;
    public static final String TAG_TITOLI = "titoli";
    private static final String TAG_IMMAGINE = "immagine";
    ListView lista;
    Bitmap bitmap;
    public ImageView immagine;
    public ImageView logoimg;

    static final String BLOG_URL = "http://www.multiplayer.it";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lista = (ListView)this.findViewById(R.id.main_lista);//recupero lista da id



        //View inflatedView = getLayoutInflater().inflate(R.layout.riga_listview, null);
        //immaginebtn = (Button)findViewById(R.id.immaginebtn);
        //creo ed eseguo l'asynctask
        ParsingPaginaWeb parsing = new ParsingPaginaWeb();
        parsing.execute("");

        // Immagine btn
        /*immaginebtn.setOnClickListener(new OnClickListener() {
            public void onClick(View arg0) {
                // Execute Logo AsyncTask
                new Logo().execute();
            }
        });*/
        //new Logo().execute();

         // Launching new screen on Selecting Single ListItem
            lista.setOnItemClickListener(new OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> parent, View view,
                        int position, long id) {
                    // getting values from selected ListItem
                    String titoli = ((TextView) view.findViewById(R.id.riga_listview_titolo)).getText().toString();
                    immagine = ((ImageView) view.findViewById(R.id.imageView1));

                    // Starting new intent
                    Intent in = new Intent(getApplicationContext(), SingleActivity.class);
                    in.putExtra(TAG_TITOLI, titoli);
                    in.putExtra(TAG_IMMAGINE, bitmap);
                    //in.putExtra(TAG_CONTENT, cont);
                    startActivity(in);

                }
            });

    }

    private class ParsingPaginaWeb extends AsyncTask<String,String,String> {

        ArrayList<String> titoli; //lista dei titoli
        ArrayList<Bitmap> bitmap = new ArrayList<Bitmap>(); 
        //ArrayList<String> content; //lista delle descrizioni

        @Override
        protected void onPreExecute()
        {   
            //prima di eseguire il parsing inizializzo gli arraylist
            mProgressDialog = new ProgressDialog(MainActivity.this);
            mProgressDialog.setTitle("Multiplayer.it");
            mProgressDialog.setMessage("Caricamento articoli...");
            mProgressDialog.setIndeterminate(false);
            mProgressDialog.show();

            titoli = new ArrayList<String>();
            bitmap = new ArrayList<Bitmap>(); 
            //content = new ArrayList<String>();
        }

        @Override
        protected String doInBackground(String... params) {
            try {

                Document doc = Jsoup.connect(BLOG_URL).get();
                Elements nodeBlogStats = doc.select("div.news-col-0 h3"); //per multiplayer.it Elements nodeBlogStats = doc.select("div.news-col-0 h3"); per ftv #comunePartINI > option
                for(Element sezione : nodeBlogStats)
                {
                    titoli.add(sezione.text());



                }
            } catch (Exception e) {
                // In caso di errore
                Log.e("ESEMPIO", "ERRORE NEL PARSING");
            }
            return null;
        }



        @Override
        protected void onPostExecute(String result)
        {
            // dopo che ho eseguito il parsing mostro i dati nella listview
            // usando il custom array adpater ParsingArrayAdapter
            ParsingArrayAdapter adapter = new ParsingArrayAdapter(MainActivity.this, titoli, bitmap);
            lista.setAdapter(adapter);
            mProgressDialog.dismiss();
            new Logo().execute();
        }


    }

    // Classe per caricamento immagini..

    // Logo AsyncTask

    private class Logo extends AsyncTask<Void, Void, Void> {


        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            mProgressDialog = new ProgressDialog(MainActivity.this);
            mProgressDialog.setTitle("Immagini");
            mProgressDialog.setMessage("Loading images...");
            mProgressDialog.setIndeterminate(false);
            mProgressDialog.show();
        }

        @Override
        protected Void doInBackground(Void... params) {

            try {
                // Connect to the web site
                Document document = Jsoup.connect(BLOG_URL).get();
                // Using Elements to get the class data 
                //Elements img = document.select("div.news-col-0 img[src]");
                // Locate the src attribute
                for(Element img : document.select("div.news-col-0 img[src]")) {
                    String ImgSrc = img.attr("src");
                // Download image from URL
                    InputStream is = new java.net.URL(ImgSrc).openStream();
                    bitmap = BitmapFactory.decodeStream(is);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            // Set downloaded image into ImageView
            logoimg = (ImageView) findViewById(R.id.imageView1);
            logoimg.setImageBitmap(bitmap);
            mProgressDialog.dismiss();

           // ParsingArrayAdapter adapter = new ParsingArrayAdapter(MainActivity.this, titoli);
           // lista.setAdapter(adapter);
        }
    }

}

Answer 1

您没有向ArrayList添加位图。我想在你的Logo AsyncTask中，在doInBackground中，而不是：

for(Element img : document.select("div.news-col-0 img[src]")) {
    String ImgSrc = img.attr("src");
    // Download image from URL
    InputStream is = new java.net.URL(ImgSrc).openStream();
    bitmap = BitmapFactory.decodeStream(is);
 }

你想做的事：

 for(Element img : document.select("div.news-col-0 img[src]")) {
    String ImgSrc = img.attr("src");
    // Download image from URL
    InputStream is = new java.net.URL(ImgSrc).openStream();

    //add Bitmap to an array
    bitmap.add(BitmapFactory.decodeStream(is));
 }

Answer 2

您的位图数组似乎太小（但不是空）。

请检查位图数组是否具有与titoli数组相同或更多的项目。例如：

public ParsingArrayAdapter(Context context,ArrayList<String> titoli, List<Bitmap> bitmap)
    {
        super(context,TITOLO);
        this.c = context;
        this.titoli = titoli;
        this.bitmap = bitmap;
        this.inflater = LayoutInflater.from(c);
        if (this.titoli.size() > this.bitmap.size())
        Log.d("Array compare", "Titoli > Bitmap!");  
    }

并检查日志输出

我的适配器中的IndexOutOfBoundsExeption

2 个答案: