无法启动活动组件信息：尝试调用虚拟方法：'；com.android.volley.toolbox.ImageLoader'；
我正在尝试制作一个应用程序，在其中我将分享有关电影的评论。在这里，我使用volley从服务器获取数据，并将其放入自定义listView中 MainActivity.java无法启动活动组件信息：尝试调用虚拟方法：'；com.android.volley.toolbox.ImageLoader'；,android,json,listview,android-volley,android-logcat,Android,Json,Listview,Android Volley,Android Logcat,我正在尝试制作一个应用程序，在其中我将分享有关电影的评论。在这里，我使用volley从服务器获取数据，并将其放入自定义listView中 MainActivity.java public class MainActivity extends Activity { private static final String TAG = MainActivity.class.getSimpleName(); private static final String url = "htt
public class MainActivity extends Activity
{
private static final String TAG = MainActivity.class.getSimpleName();
private static final String url = "http://api.androidhive.info/json/movies.json";
private ProgressDialog pDialog;
private List<team.mrmalhotra.com.newmalayalamsmscollections.model.Movie> movieList = new ArrayList<team.mrmalhotra.com.newmalayalamsmscollections.model.Movie>();
private ListView listView;
private CustomListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.list);
adapter = new CustomListAdapter(this, movieList);
listView.setAdapter(adapter);
pDialog = new ProgressDialog(this);
pDialog.setMessage("Loading...");
pDialog.show();
getActionBar().setBackgroundDrawable(
new ColorDrawable(Color.parseColor("#1b1b1b")));
JsonArrayRequest movieReq = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
Movie movie = new Movie();
movie.setTitle(obj.getString("title"));
movie.setThumbnailUrl(obj.getString("image"));
movie.setRating(((Number) obj.get("rating"))
.doubleValue());
movie.setYear(obj.getInt("releaseYear"));
JSONArray genreArry = obj.getJSONArray("genre");
ArrayList<String> genre = new ArrayList<String>();
for (int j = 0; j < genreArry.length(); j++) {
genre.add((String) genreArry.get(j));
}
movie.setGenre(genre);
movieList.add(movie);
} catch (JSONException e) {
e.printStackTrace();
}
}
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(movieReq);
}
@Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
public class LruBitmapCache extends LruCache<String, Bitmap> implements ImageLoader.ImageCache {
public static int getDefaultLruCacheSize() {
final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
final int cacheSize = maxMemory / 8;
return cacheSize;
}
public LruBitmapCache() {
this(getDefaultLruCacheSize());
}
public LruBitmapCache(int sizeInKiloBytes) {
super(sizeInKiloBytes);
}
@Override
protected int sizeOf(String key, Bitmap value) {
return value.getRowBytes() * value.getHeight() / 1024;
}
@Override
public Bitmap getBitmap(String url) {
return get(url);
}
@Override
public void putBitmap(String url, Bitmap bitmap) {
put(url, bitmap);
}
}
public class Movie {
private String title, thumbnailUrl;
private int year;
private double rating;
private ArrayList<String> genre;
public Movie() {
}
public Movie(String name, String thumbnailUrl, int year, double rating,
ArrayList<String> genre) {
this.title = name;
this.thumbnailUrl = thumbnailUrl;
this.year = year;
this.rating = rating;
this.genre = genre;
}
public String getTitle() {
return title;
}
public void setTitle(String name) {
this.title = name;
}
public String getThumbnailUrl() {
return thumbnailUrl;
}
public void setThumbnailUrl(String thumbnailUrl) {
this.thumbnailUrl = thumbnailUrl;
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public double getRating() {
return rating;
}
public void setRating(double rating) {
this.rating = rating;
}
public ArrayList<String> getGenre() {
return genre;
}
public void setGenre(ArrayList<String> genre) {
this.genre = genre;
}
}
公共类MainActivity扩展活动
{
私有静态最终字符串标记=MainActivity.class.getSimpleName（）；
私有静态最终字符串url=”http://api.androidhive.info/json/movies.json";
私人对话；
private List movieList=new ArrayList（）；
私有列表视图列表视图；
专用自定义列表适配器；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
listView=（listView）findViewById（R.id.list）；
adapter=新的CustomListAdapter（此，movieList）；
setAdapter（适配器）；
pDialog=新建进度对话框（此对话框）；
设置消息（“加载…”）；
pDialog.show（）；
getActionBar（）.setBackgroundDrawable(
新的可着色（Color.parseColor（#1b1b1b”）；
JsonArrayRequest movieReq=新的JsonArrayRequest（url，
新的Response.Listener（）{
@凌驾
公共void onResponse（JSONArray响应）{
Log.d（TAG，response.toString（））；
hidePDialog（）；
对于（int i=0；ipublic class MainActivity extends Activity
{
private static final String TAG = MainActivity.class.getSimpleName();
private static final String url = "http://api.androidhive.info/json/movies.json";
private ProgressDialog pDialog;
private List<team.mrmalhotra.com.newmalayalamsmscollections.model.Movie> movieList = new ArrayList<team.mrmalhotra.com.newmalayalamsmscollections.model.Movie>();
private ListView listView;
private CustomListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.list);
adapter = new CustomListAdapter(this, movieList);
listView.setAdapter(adapter);
pDialog = new ProgressDialog(this);
pDialog.setMessage("Loading...");
pDialog.show();
getActionBar().setBackgroundDrawable(
new ColorDrawable(Color.parseColor("#1b1b1b")));
JsonArrayRequest movieReq = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
Movie movie = new Movie();
movie.setTitle(obj.getString("title"));
movie.setThumbnailUrl(obj.getString("image"));
movie.setRating(((Number) obj.get("rating"))
.doubleValue());
movie.setYear(obj.getInt("releaseYear"));
JSONArray genreArry = obj.getJSONArray("genre");
ArrayList<String> genre = new ArrayList<String>();
for (int j = 0; j < genreArry.length(); j++) {
genre.add((String) genreArry.get(j));
}
movie.setGenre(genre);
movieList.add(movie);
} catch (JSONException e) {
e.printStackTrace();
}
}
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(movieReq);
}
@Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
public class LruBitmapCache extends LruCache<String, Bitmap> implements ImageLoader.ImageCache {
public static int getDefaultLruCacheSize() {
final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
final int cacheSize = maxMemory / 8;
return cacheSize;
}
public LruBitmapCache() {
this(getDefaultLruCacheSize());
}
public LruBitmapCache(int sizeInKiloBytes) {
super(sizeInKiloBytes);
}
@Override
protected int sizeOf(String key, Bitmap value) {
return value.getRowBytes() * value.getHeight() / 1024;
}
@Override
public Bitmap getBitmap(String url) {
return get(url);
}
@Override
public void putBitmap(String url, Bitmap bitmap) {
put(url, bitmap);
}
}
public class Movie {
private String title, thumbnailUrl;
private int year;
private double rating;
private ArrayList<String> genre;
public Movie() {
}
public Movie(String name, String thumbnailUrl, int year, double rating,
ArrayList<String> genre) {
this.title = name;
this.thumbnailUrl = thumbnailUrl;
this.year = year;
this.rating = rating;
this.genre = genre;
}
public String getTitle() {
return title;
}
public void setTitle(String name) {
this.title = name;
}
public String getThumbnailUrl() {
return thumbnailUrl;
}
public void setThumbnailUrl(String thumbnailUrl) {
this.thumbnailUrl = thumbnailUrl;
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public double getRating() {
return rating;
}
public void setRating(double rating) {
this.rating = rating;
}
public ArrayList<String> getGenre() {
return genre;
}
public void setGenre(ArrayList<String> genre) {
this.genre = genre;
}
}
公共类LruBitmapCache扩展LruCache实现ImageLoader.ImageCache{
公共静态int getDefaultLruCacheSize（）{
final int maxMemory=（int）（Runtime.getRuntime（）.maxMemory（）/1024）；
最终int cacheSize=maxMemory/8；
返回缓存大小；
}
公共LRubitMacache（）{
这个（getDefaultLruCacheSize（））；
}
公共lrubitMacache（int-sizeInKiloBytes）{
超级（sizeInKiloBytes）；
}
@凌驾
受保护的int-sizeOf（字符串键、位图值）{
返回值.getRowBytes（）*value.getHeight（）/1024；
}
@凌驾
公共位图getBitmap（字符串url）{
返回get（url）；
}
@凌驾
公共位图（字符串url、位图）{
put（url、位图）；
}
}
public class MainActivity extends Activity
{
private static final String TAG = MainActivity.class.getSimpleName();
private static final String url = "http://api.androidhive.info/json/movies.json";
private ProgressDialog pDialog;
private List<team.mrmalhotra.com.newmalayalamsmscollections.model.Movie> movieList = new ArrayList<team.mrmalhotra.com.newmalayalamsmscollections.model.Movie>();
private ListView listView;
private CustomListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.list);
adapter = new CustomListAdapter(this, movieList);
listView.setAdapter(adapter);
pDialog = new ProgressDialog(this);
pDialog.setMessage("Loading...");
pDialog.show();
getActionBar().setBackgroundDrawable(
new ColorDrawable(Color.parseColor("#1b1b1b")));
JsonArrayRequest movieReq = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
Movie movie = new Movie();
movie.setTitle(obj.getString("title"));
movie.setThumbnailUrl(obj.getString("image"));
movie.setRating(((Number) obj.get("rating"))
.doubleValue());
movie.setYear(obj.getInt("releaseYear"));
JSONArray genreArry = obj.getJSONArray("genre");
ArrayList<String> genre = new ArrayList<String>();
for (int j = 0; j < genreArry.length(); j++) {
genre.add((String) genreArry.get(j));
}
movie.setGenre(genre);
movieList.add(movie);
} catch (JSONException e) {
e.printStackTrace();
}
}
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(movieReq);
}
@Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
public class LruBitmapCache extends LruCache<String, Bitmap> implements ImageLoader.ImageCache {
public static int getDefaultLruCacheSize() {
final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
final int cacheSize = maxMemory / 8;
return cacheSize;
}
public LruBitmapCache() {
this(getDefaultLruCacheSize());
}
public LruBitmapCache(int sizeInKiloBytes) {
super(sizeInKiloBytes);
}
@Override
protected int sizeOf(String key, Bitmap value) {
return value.getRowBytes() * value.getHeight() / 1024;
}
@Override
public Bitmap getBitmap(String url) {
return get(url);
}
@Override
public void putBitmap(String url, Bitmap bitmap) {
put(url, bitmap);
}
}
public class Movie {
private String title, thumbnailUrl;
private int year;
private double rating;
private ArrayList<String> genre;
public Movie() {
}
public Movie(String name, String thumbnailUrl, int year, double rating,
ArrayList<String> genre) {
this.title = name;
this.thumbnailUrl = thumbnailUrl;
this.year = year;
this.rating = rating;
this.genre = genre;
}
public String getTitle() {
return title;
}
public void setTitle(String name) {
this.title = name;
}
public String getThumbnailUrl() {
return thumbnailUrl;
}
public void setThumbnailUrl(String thumbnailUrl) {
this.thumbnailUrl = thumbnailUrl;
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public double getRating() {
return rating;
}
public void setRating(double rating) {
this.rating = rating;
}
public ArrayList<String> getGenre() {
return genre;
}
public void setGenre(ArrayList<String> genre) {
this.genre = genre;
}
}
公共类电影{
私有字符串标题，缩略图URL；
私人国际年；
私人双重评级；
私人阿雷亚主义流派；
公共电影（）{
}
公共电影（字符串名称、字符串缩略图URL、整数年、双评级、，
ArrayList流派）{
this.title=名称；
this.thumbnailUrl=thumbnailUrl；
今年=年；
这个。评级=评级；
这个。流派=流派；
}
公共字符串getTitle（）{
返回标题；
}
public void setTitle（字符串名称）{
this.title=名称；
}
公共字符串getThumbnailUrl（）{
返回缩略图URL；
}
公共void setThumbnailUrl（字符串thumbnailUrl）{
this.thumbnailUrl=thumbnailUrl；
}
公共int getYear（）{
回归年；
}
公共年（国际年）{
今年=年；
}
公共双重评级（）{
回报率；
}
公共评级（双重评级）{
这个。评级=评级；
}
公共ArrayList getgreen（）{
回归体裁；
}
公共无效集合类型（ArrayList类型）{
这个。流派=流派；
}
}
public class CustomListAdapter extends BaseAdapter {
private Activity activity;
private LayoutInflater inflater;
private List<Movie> movieItems;
ImageLoader imageLoader = AppController.getInstance().getImageLoader();
public CustomListAdapter(Activity activity, List<Movie> movieItems) {
this.activity = activity;
this.movieItems = movieItems;
}
@Override
public int getCount() {
return movieItems.size();
}
@Override
public Object getItem(int location) {
return movieItems.get(location);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = inflater.inflate(R.layout.list_row, null);
if (imageLoader == null)
imageLoader = AppController.getInstance().getImageLoader();
NetworkImageView thumbNail = (NetworkImageView) convertView
.findViewById(R.id.thumbnail);
TextView title = (TextView) convertView.findViewById(R.id.title);
TextView rating = (TextView) convertView.findViewById(R.id.rating);
TextView genre = (TextView) convertView.findViewById(R.id.genre);
TextView year = (TextView) convertView.findViewById(R.id.releaseYear);
// getting movie data for the row
Movie m = movieItems.get(position);
// thumbnail image
thumbNail.setImageUrl(m.getThumbnailUrl(), imageLoader);
// title
title.setText(m.getTitle());
// rating
rating.setText("Rating: " + String.valueOf(m.getRating()));
// genre
String genreStr = "";
for (String str : m.getGenre()) {
genreStr += str + ", ";
}
genreStr = genreStr.length() > 0 ? genreStr.substring(0,
genreStr.length() - 2) : genreStr;
genre.setText(genreStr);
// release year
year.setText(String.valueOf(m.getYear()));
return convertView;
}
}
public class AppController extends Application {
public static final String TAG = AppController.class.getSimpleName();
private RequestQueue mRequestQueue;
private ImageLoader mImageLoader;
private static AppController mInstance;
@Override
public void onCreate() {
super.onCreate();
mInstance = this;
}
public static synchronized AppController getInstance() {
return mInstance;
}
public RequestQueue getRequestQueue() {
if (mRequestQueue == null) {
mRequestQueue = Volley.newRequestQueue(getApplicationContext());
}
return mRequestQueue;
}
public ImageLoader getImageLoader() {
getRequestQueue();
if (mImageLoader == null) {
mImageLoader = new ImageLoader(this.mRequestQueue,
new LruBitmapCache());
}
return this.mImageLoader;
}
public <T> void addToRequestQueue(Request<T> req, String tag) {
// set the default tag if tag is empty
req.setTag(TextUtils.isEmpty(tag) ? TAG : tag);
getRequestQueue().add(req);
}
public <T> void addToRequestQueue(Request<T> req) {
req.setTag(TAG);
getRequestQueue().add(req);
}
public void cancelPendingRequests(Object tag) {
if (mRequestQueue != null) {
mRequestQueue.cancelAll(tag);
}
}
}
公共类CustomListAdapter扩展了BaseAdapter{
私人活动；
私人充气机；
私人电影项目清单；
ImageLoader ImageLoader=AppController.getInstance（）.getI