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獲取空指針異常，我已經聲明所有的活動在清單中，但仍然發生錯誤，請幫我解決這個問題。 錯誤是 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）空指針異常組件信息
代碼 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));
}
}
不，我已經聲明json對象在使用它之前，仍然m得到這個錯誤 – user3354610
你已經聲明它，但你還沒有初始化任何地方'活動'到目前爲止我所看到的。例如。你已經在'AndroidJSONParsingActivity'中完成了'json = jParser.getJSONFromUrl（url）;'''''SingleMenuItemActivity' – Apoorv