获取空指针异常，我已经在清单中声明了所有活动但仍然发生错误请帮我解决这个问题。 错误是 06-28 14：55：55.683：E / AndroidRuntime（889）：引起：java.lang.NullPointerException 06-28 14：55：55.683：E / AndroidRuntime（889）：at com.androidhive.jsonparsing.SingleMenuItemActivity.onCreate（SingleMenuItemActivity.java:65）
代码 AndroidJsonparsingActivity.java
public class AndroidJSONParsingActivity<Search> extends ListActivity {
public class HorizontalListview {
}
// url to make request
private static String url ="";
// JSON Node names
Bitmap bitmap;
Bitmap bitmap1;
Bitmap bitmap2;
Bitmap bitmap3;
@SuppressWarnings("unused")
private static final String TAG_MOVIE = "Movies";
private static final String TAG_MOVIEID = "MovieId";
@SuppressWarnings("unused")
private static final String TAG_MOVIEIMAGE = "MovieImage";
private static final String TAG_DISTANCE = "Distance";
private static final String TAG_PINCODE = "PinCodeNo";
private static final String TAG_THEATERS = "Theaters";
private static final String TAG_THEATERSNAME = "TheaterName";
ImageView iv;
ListView lv1;
// contacts JSONArray
JSONArray movies = null;
JSONArray theaters = null;
ImageView i,iv1,iv2,iv3;
TextView tv;
JSONArray dates = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
iv=(ImageView) findViewById(R.id.imageView1);
iv1=(ImageView) findViewById(R.id.imageView2);
iv2=(ImageView) findViewById(R.id.imageView3);
iv3=(ImageView)findViewById(R.id.imageView4);
tv=(TextView)findViewById(R.id.date1);
Spinner sp=(Spinner)findViewById(R.id.spinner1);
//p=(ProgressBar) findViewById(R.id.loader);
ImageLoader imageLoader = new ImageLoader(AndroidJSONParsingActivity.this);
//i.setTag(imgUrl);
// imageLoader.DisplayImage("http://content6.flixster.com/movie/11/17/84/11178428_pro.jpg", AndroidJSONParsingActivity.this,iv,);
// Hashmap for ListView
ArrayList<HashMap<String, String>> movieList = new ArrayList<HashMap<String, String>>();
ArrayList<HashMap<String, String>> theaterList = new ArrayList<HashMap<String, String>>();
bitmap = getBitmapFromUrl("http://content6.flixster.com/movie/11/17/75/11177548_pro.jpg");
bitmap1 = getBitmapFromUrl("http://content6.flixster.com/movie/11/17/84/11178428_pro.jpg");
bitmap2 = getBitmapFromUrl("http://content7.flixster.com/movie/11/17/82/11178261_pro.jpg");
bitmap3 = getBitmapFromUrl("http://content7.flixster.com/movie/11/17/82/11178261_pro.jpg");
iv.setImageBitmap(bitmap);
iv1.setImageBitmap(bitmap1);
iv2.setImageBitmap(bitmap2);
iv3.setImageBitmap(bitmap3);
// Creating JSON Parser instance
JSONParser jParser = new JSONParser();
@SuppressWarnings("unused")
JSONParser client = new JSONParser(
WebServiceUrl.GetDatesForTheater2);
// getting JSON string from URL
JSONObject json = null;
json = jParser.getJSONFromUrl(url);
@SuppressWarnings("unused")
String jsonString ="";
String jResponse = client.getStrResponse();
// dates = new ArrayList<String>();
try {
// Getting Array of Contacts
JSONArray j= json.getJSONArray(jResponse);
//theaters = json.getJSONArray(TAG_THEATERS);
// looping through All Contacts
for(int i = 0; i < j.length(); i++){
JSONObject c = j.getJSONObject(i);
System.out.println("val of c " +c);
// Storing each json item in variable
//String id = c.getString(TAG_MOVIEID);
//String image = c.getString(TAG_MOVIEIMAGE);
// Phone number is agin JSON Object
// creating new HashMap
//HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
//map.put(TAG_MOVIEID, id);
//map.put(TAG_MOVIEIMAGE, image);
// adding HashList to ArrayList
//movieList.add(map);
}
JSONArray jsonarray = new JSONArray(jResponse);
if(Global.showTimes.size()<=0){
for (int i = 0; i < jsonarray.length(); i++) {
System.out.println(jsonarray.get(i));
Global.showTimes.add(String.valueOf(jsonarray.get(i)));
}
}
System.out.println("value of dates:->" + Global.showTimes);
tv.setText((CharSequence) Global.showTimes);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println("exception" +e);
}
//ArrayAdapter<CharSequence> as = new ArrayAdapter<CharSequence>(getApplicationContext(),R.id.date);
// as.setDropDownViewResource(android.R.layout.simple_spinner_item);
//as.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
//sp.setAdapter(as);
catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println("this is the error" +e);
}
try {
// Getting Array of Contacts
movies = json.getJSONArray(TAG_MOVIE);
//theaters = json.getJSONArray(TAG_THEATERS);
// looping through All Contacts
for(int i = 0; i < movies.length(); i++){
JSONObject c = movies.getJSONObject(i);
// Storing each json item in variable
String id = c.getString(TAG_MOVIEID);
//String image = c.getString(TAG_MOVIEIMAGE);
// Phone number is agin JSON Object
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(TAG_MOVIEID, id);
//map.put(TAG_MOVIEIMAGE, image);
// adding HashList to ArrayList
movieList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
ListAdapter adapter1 = new SimpleAdapter(this, movieList,
R.layout.list_item,
new String[] { TAG_MOVIEID, TAG_MOVIEIMAGE }, new int[] {
R.id.name, R.id.image, });
setListAdapter(adapter1);
try {
// Getting Array of Contacts
theaters = json.getJSONArray(TAG_THEATERS);
// looping through All Contacts
for(int i = 0; i < theaters.length(); i++){
JSONObject c = theaters.getJSONObject(i);
// Storing each json item in variable
String name = c.getString(TAG_THEATERSNAME);
String distance = c.getString(TAG_DISTANCE);
String pincode = c.getString(TAG_PINCODE);
//String image = c.getString(TAG_MOVIEIMAGE);
// Phone number is agin JSON Object
// creating new HashMap
HashMap<String, String> map1 = new HashMap<String, String>();
// adding each child node to HashMap key => value
map1.put(TAG_DISTANCE,distance);
map1.put(TAG_PINCODE,pincode);
map1.put(TAG_THEATERSNAME,name);
//map.put(TAG_MOVIEIMAGE, image);
// adding HashList to ArrayList
theaterList.add(map1);
}
} catch (JSONException e) {
e.printStackTrace();
}
/**
* Updating parsed JSON data into ListView
* */
@SuppressWarnings("unused")
ListAdapter adapter11 = new SimpleAdapter(this, theaterList,
R.layout.list_item,
new String[] { TAG_THEATERSNAME,TAG_DISTANCE,TAG_PINCODE}, new int[] {
R.id.tname,R.id.distance,R.id.pincode });
setListAdapter(adapter11);
// selecting single ListView item
ListView lv = getListView();
@SuppressWarnings("unused")
ListView lv1= getListView();
// Launching new screen on Selecting Single ListItem
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
//String name = ((TextView) view.findViewById(R.id.name)).getText().toString();
//String cost = ((TextView) view.findViewById(R.id.image)).getText().toString();
TextView tv=(TextView)findViewById(R.id.tname);
tv.setText(TAG_THEATERSNAME);
String name = tv.getText().toString();
bitmap = getBitmapFromUrl("http://content6.flixster.com/movie/11/17/84/11178428_pro.jpg");
bitmap1 = getBitmapFromUrl("http://content6.flixster.com/movie/11/17/84/11178428_pro.jpg");
bitmap2 = getBitmapFromUrl("http://content6.flixster.com/movie/11/17/84/11178428_pro.jpg");
// Starting new intent
Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
in.putExtra("tname", name);
System.out.println("THEATER NAME" +TAG_THEATERSNAME);
startActivity(in);
}
private Bitmap getBitmapFromUrl(String src) {
// TODO Auto-generated method stub
try {
URL url =new URL(src);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input=connection.getInputStream();
Bitmap mybiBitmap=BitmapFactory.decodeStream(input);
return mybiBitmap;
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
return null;
}
}
});
}
private Bitmap getBitmapFromUrl(String src) {
// TODO Auto-generated method stub
try {
URL url =new URL(src);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input=connection.getInputStream();
Bitmap mybiBitmap=BitmapFactory.decodeStream(input);
return mybiBitmap;
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
return null;
}
}
Singlemenuitemactivity.java
public class SingleMenuItemActivity extends Activity {
private static String url ="";
Bitmap bitmap;
Bitmap bitmap1,bitmap2,bitmap3;
ImageView iv,iv1,iv2,iv3;
private static final String TAG_DISTANCE = "Distance";
private static final String TAG_PINCODE = "PinCodeNo";
private static final String TAG_THEATERS = "Theaters";
private static final String TAG_THEATERSNAME = "TheaterName";
//private static final String TAG_THEATERS = "Theaters";
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.single_list_item);
JSONObject json = null;
JSONArray theaters = null;
@SuppressWarnings("unused")
TextView tv=(TextView)findViewById(R.id.date1);
ImageView iv=(ImageView)findViewById(R.id.imageView1);
ImageView iv1=(ImageView)findViewById(R.id.imageView2);
ImageView iv2=(ImageView)findViewById(R.id.imageView3);
ImageView iv3=(ImageView)findViewById(R.id.imageView4);
ArrayList<HashMap<String, String>> theaterList = new ArrayList<HashMap<String, String>>();
bitmap = getBitmapFromUrl("http://content6.flixster.com/movie/11/17/75/11177548_pro.jpg");
bitmap1 = getBitmapFromUrl("http://content6.flixster.com/movie/11/17/84/11178428_pro.jpg");
bitmap2 = getBitmapFromUrl("http://content7.flixster.com/movie/11/17/82/11178261_pro.jpg");
bitmap3 = getBitmapFromUrl("http://content7.flixster.com/movie/11/17/82/11178261_pro.jpg");
iv.setImageBitmap(bitmap);
iv1.setImageBitmap(bitmap1);
iv2.setImageBitmap(bitmap2);
iv3.setImageBitmap(bitmap3);
try {
// Getting Array of Contacts
theaters = json.getJSONArray(TAG_THEATERS);
// looping through All Contacts
for(int i = 0; i < theaters.length(); i++){
JSONObject c = theaters.getJSONObject(i);
// Storing each json item in variable
String name = c.getString(TAG_THEATERSNAME);
String distance = c.getString(TAG_DISTANCE);
String pincode = c.getString(TAG_PINCODE);
//String image = c.getString(TAG_MOVIEIMAGE);
// Phone number is agin JSON Object
// creating new HashMap
HashMap<String, String> map1 = new HashMap<String, String>();
// adding each child node to HashMap key => value
map1.put(TAG_DISTANCE,distance);
map1.put(TAG_PINCODE,pincode);
map1.put(TAG_THEATERSNAME,name);
//map.put(TAG_MOVIEIMAGE, image);
// adding HashList to ArrayList
theaterList.add(map1);
}
} catch (JSONException e) {
e.printStackTrace();
}
/**
* Updating parsed JSON data into ListView
* */
@SuppressWarnings("unused")
ListAdapter adapter11 = new SimpleAdapter(this, theaterList,
R.layout.list_item,
new String[] { TAG_THEATERSNAME,TAG_DISTANCE,TAG_PINCODE}, new int[] {
R.id.tname,R.id.distance,R.id.pincode });
setListAdapter(adapter11);
// ListView LV=(ListView)findViewById(R.id.listView1);
}
private void setListAdapter(ListAdapter adapter11) {
// TODO Auto-generated method stub
}
private Bitmap getBitmapFromUrl(String src) {
// TODO Auto-generated method stub
try {
URL url =new URL(src);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input=connection.getInputStream();
Bitmap mybiBitmap=BitmapFactory.decodeStream(input);
return mybiBitmap;
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
return null;
}
}
}
Jsonparser.java
public class JSONParser {
public enum RequestMethod {
GET, POST
}
private String url;
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
String strResponse;
private ArrayList<NameValuePair> params;
// constructor
public JSONParser() {
}
public JSONParser(String url) {
this.url= url;
params = new ArrayList<NameValuePair>();
}
public String getStrResponse() {
return strResponse;
}
public boolean Execute(RequestMethod method) throws Exception {
boolean isExpired = false;
switch (method) {
case GET: {
// add parameters
String combinedParams = "";
if (!params.isEmpty()) {
combinedParams += "?";
for (NameValuePair p : params) {
String paramString = p.getName() + "="
+ URLEncoder.encode(p.getValue(), "UTF-8");
if (combinedParams.length() > 1) {
combinedParams += "&" + paramString;
} else {
combinedParams += paramString;
}
}
}
}
}
return isExpired;
}
public JSONObject getJSONFromUrl(String url) {
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpget);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
public void AddParam(String name, String value) {
params.add(new BasicNameValuePair(name, value));
}
}
答案 0 :(得分：1)
您尚未初始化
JSONObject json = null;
之前使用
theaters = json.getJSONArray(TAG_THEATERS);
结果你得到NullPointerException。您可能希望获取一些数据并将其存储在json