java.lang.ClassCastException：java.util.HashMapをandroid.content.pm.PackageInfoにキャストできません

Question

jsonパーサーからハッシュマップでソートされたアプリのリストがあります。私はアプリの情報を表示しようとしますが、それはエラーが

@Override 
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 


      PackageInfo packageInfo = (PackageInfo) parent.getItemAtPosition(position); 
      AppData appData = (AppData) getActivity().getApplicationContext(); 
      appData.setPackageInfo(packageInfo); 


     try { 
      Intent appInfo = new Intent(getActivity().getApplicationContext(), permdisabled.class); 
      startActivity(appInfo); 
     } 

     catch (Exception e) 
     { 
      Log.e(TAG, "error in intent"); 
     } 
    } 

を開始

public class iqa extends Fragment {  

ListView communication; 
ArrayList<HashMap<String, String>> communicationlist = new ArrayList<HashMap<String, String>>(); 

public class now extends AsyncTask <HttpURLConnection, Void,Void> implements AdapterView.OnItemClickListener { 

//returns app name using package name as input 
public String appName(String pack){ 
     String Name = null; 

     try{ 
      PackageManager packManager = getContext().getPackageManager(); 
      ApplicationInfo app = getContext().getPackageManager().getApplicationInfo(pack, 0); 
      Name = packManager.getApplicationLabel(app).toString(); 
     } 
     catch(Exception e){ 
      e.printStackTrace(); 
     } 

     return Name; 
    } 


private void getAppCategories() throws IOException, JSONException 
    { 

     BufferedReader bufferedReader = null; 
     HttpURLConnection urlConnection = null; 
     BufferedWriter bufferedWriter = null; 

     StringBuilder result = new StringBuilder(); 

     //Create JSON object to send to webservice 
     JSONObject jsonObjectSend = new JSONObject(); 
     JSONArray jsonArrayPakages = new JSONArray(); 
     PackageManager packageManager; 
     List<ResolveInfo> listApps; //this list store all app in device 

     try { 
      packageManager = getActivity().getPackageManager(); 
      Intent filterApp = new Intent(Intent.ACTION_MAIN); 
      filterApp.addCategory(Intent.CATEGORY_LAUNCHER); 
      listApps = packageManager.queryIntentActivities(filterApp, PackageManager.GET_META_DATA); 

      for (ResolveInfo app : listApps){ 
       jsonArrayPakages.put(app.activityInfo.packageName.trim()); 
      } 

      jsonObjectSend.put("packages", jsonArrayPakages); 

      Log.d("json", jsonObjectSend.toString()); 

      URL url = new URL("http://getdatafor.appspot.com/data?key=53972606b926d38191a5446fdff89e377873d767fabedf6d"); 
      urlConnection = (HttpURLConnection) url.openConnection(); 
      urlConnection.setConnectTimeout(30000); /* milliseconds */ 
      urlConnection.setReadTimeout(30000); /* milliseconds */ 
      urlConnection.setRequestMethod("POST"); 
      urlConnection.setRequestProperty("Content-Type", "application-json"); 
      urlConnection.setDoOutput(true); /* allow output to send data */ 
      urlConnection.connect(); 

      OutputStream outputStream = urlConnection.getOutputStream(); 
      bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream)); 
      bufferedWriter.write(jsonObjectSend.toString()); 
      bufferedWriter.flush(); 

      InputStream inputStream = urlConnection.getInputStream(); 
      bufferedReader = new BufferedReader(new InputStreamReader(inputStream)); 

      //Read data 
      String line; 
      while ((line = bufferedReader.readLine()) != null) { 
       result.append(line); 
      } 

     /*Parse JSON**********************************************************************************/ 


      JSONObject jsonObjectResult = new JSONObject(result.toString().trim()); 
      JSONArray jsonArrayApps = jsonObjectResult.getJSONArray("apps"); 
      for (int j = 0; j < jsonArrayApps.length(); j++) { 

       JSONObject jsonObjectApp = jsonArrayApps.getJSONObject(j); 

       String packageName = jsonObjectApp.getString("package").trim(); 
       String cate = jsonObjectApp.getString("category").trim(); 

       Log.d("result", (j + 1) + "---> : " + packageName + "---" + cate); 
       HashMap<String, String> communicationmap = new HashMap<String, String>(); 
       String Communication = "Communication"; 

       String ca = e.getString("category").trim(); 
       String vit = e.getString("package").trim(); 
       String va = appName(vit); 

       if (ca.equals(Communication) || ca.equals(Social) || ca.equals(dat)) 
       { 
        boolean communicexist = communicationmap.containsValue(va); 

        if (communicexist == false) 
        { 
         communicationmap.put("Name", va); 
         communicationmap.put("cate", ca); 
         communicationlist.add(communicationmap); 
        } 
        else 
        { 
         cmap.put("Name", va); 
         cmap.put("cate", ca); 
        } 
       } 
       finally { 
       if (bufferedReader != null) { 
       bufferedReader.close(); 
       } 
       if (bufferedWriter != null) { 
       bufferedWriter.close(); 
       } 
       if (urlConnection != null) { 
       urlConnection.disconnect(); 
       } 
       } 
      } 
    @Override 
    protected Void doInBackground(HttpURLConnection... params) { 
     try { 
      getAppCategories(); 
     } catch (IOException e) { 
      Log.d("tag", "Net work error: " + e.getMessage(), e); 
     } catch (JSONException e) { 
      Log.d("tag", "JSON is not valid: " + e.getMessage(), e); 
     } 
     return null; 
    } 
@Override 
    protected void onPostExecute(Void aVoid) { 

     // Keys used in Hashmap 
     String[] from = { "Name","cate" }; 

     // Ids of views in listview_layout 
     int[] to = { R.id.packa,R.id.catego}; 

     ListAdapter communicationadapter = new SimpleAdapter(getActivity().getBaseContext(), communicationlist,R.layout.lay,from,to); 
     communication.setAdapter(communicationadapter); 
     communication.setOnItemClickListener(this); 
     Utility.setListViewHeightBasedOnChildren(communication); 

     super.onPostExecute(aVoid); 
    } 

@Override 
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 

      //THIS IS WHERE THE ERROR STARTS 
      PackageInfo packageInfo = (PackageInfo) parent.getItemAtPosition(position); 
      AppData appData = (AppData) getActivity().getApplicationContext(); 
      appData.setPackageInfo(packageInfo); 


     try { 
      Intent appInfo = new Intent(getActivity().getApplicationContext(), permdisabled.class); 
      startActivity(appInfo); 
     } 

     catch (Exception e) 
     { 
      Log.e(TAG, "error in intent"); 
     } 
    } 
} 

THE OnItemClickアダプタはIS

iは異なるアプリカテゴリの他のリストビューを持っている心に留めてくださいコードをここにクラッシュするのOnClickこの

@Override 
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 

     HashMap<String,String> clickedItem = (HashMap<String, String>) parent.getItemAtPosition(position); 
     String packageName = clickedItem.get("package"); 

     try { 
      PackageManager packManager = getContext().getPackageManager(); 
      ApplicationInfo app = getContext().getPackageManager().getApplicationInfo(packageName, 0); 
      String appName = packManager.getApplicationLabel(app).toString(); 
      PackageInfo packageInfo = (PackageInfo) parent.getItemAtPosition(position); 
      AppData appData = (AppData) getActivity().getApplicationContext(); 
      appData.setPackageInfo(packageInfo); 
     } 
     catch (Exception e) 
     { 
      e.printStackTrace(); 
     } 

     try { 
      Intent appInfo = new Intent(getActivity().getApplicationContext(), permdisabled.class); 
      startActivity(appInfo); 
     } 

     catch (Exception e) 
     { 
      Log.e(TAG, "error in intent"); 
     } 
    } 

IGのように、それを実装した後

次のエラー

FATAL EXCEPTION: main 
       Process: com.finalyearstudentvitus.splash, PID: 25698 
       java.lang.RuntimeException: Unable to start activity ComponentInfo{com.finalyearstudentvitus.splash/com.finalyearstudentvitus.splash.permdisabled}: java.lang.NullPointerException: Attempt to read from field 'android.content.pm.ApplicationInfo android.content.pm.PackageInfo.applicationInfo' on a null object reference 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2724) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2789) 
        at android.app.ActivityThread.-wrap12(ActivityThread.java) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1527) 
        at android.os.Handler.dispatchMessage(Handler.java:110) 
        at android.os.Looper.loop(Looper.java:203) 
        at android.app.ActivityThread.main(ActivityThread.java:6251) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1073) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:934) 
       Caused by: java.lang.NullPointerException: Attempt to read from field 'android.content.pm.ApplicationInfo android.content.pm.PackageInfo.applicationInfo' on a null object reference 
        at com.finalyearstudentvitus.splash.permdisabled.setValues(permdisabled.java:44) 
        at com.finalyearstudentvitus.splash.permdisabled.onCreate(permdisabled.java:31) 
        at android.app.Activity.performCreate(Activity.java:6686) 
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2677) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2789)  
        at android.app.ActivityThread.-wrap12(ActivityThread.java)  
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1527)  
        at android.os.Handler.dispatchMessage(Handler.java:110)  
        at android.os.Looper.loop(Looper.java:203)  
        at android.app.ActivityThread.main(ActivityThread.java:6251)  
        at java.lang.reflect.Method.invoke(Native Method) 

をotの次はpermdisabled.javaクラス

public class permdisabled extends Activity { 
TextView appLabel, packageName; 
TextView req_permission, diss_perission; 
PackageInfo packageInfo; 
String pass; 



@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.permdisabled); 

    findViewsById(); 

    AppData appData = (AppData) getApplicationContext(); 
    packageInfo = appData.getPackageInfo(); 

    setValues(); 
} 

private void findViewsById() { 
    appLabel = (TextView) findViewById(R.id.appplabel); 
    packageName = (TextView) findViewById(R.id.packagee_name); 
    req_permission = (TextView) findViewById(R.id.req_permissionn); 
    diss_perission = (TextView) findViewById(R.id.diss_permissionn); 
} 

private void setValues() 
{ 
    // APP name ERROR STARTS HERE 
    appLabel.setText(getPackageManager().getApplicationLabel(
      packageInfo.applicationInfo)); 

    // package name 
    packageName.setText(packageInfo.packageName); 

    // uses-permission 
    if (packageInfo.requestedPermissions != null) { 
     req_permission.setText(getPermissions(packageInfo.requestedPermissions)); 
     pass = req_permission.toString(); 
    } 
    else { 
     req_permission.setText("-"); 
    } 
} 

// Convert string array to comma separated string 
private String getPermissions(String[] requestedPermissions) { 
    String permission = ""; 
    for (int i = 0; i < requestedPermissions.length; i++) { 
     permission = permission + requestedPermissions[i] + ",\n"; 
    } 
    return permission; 
} 

}

Answer 1

にある次実装してみてください：、

// Modify your HashMap like this 
if (communicexist == false) 
        { 
         communicationmap.put("package", vit); 
         communicationmap.put("cate", ca); 
         communicationlist.add(communicationmap); 
        } 
        else 
        { 
         cmap.put("package", vit); 
         cmap.put("cate", ca); 
        } 

を次にonItemClickに

@Override 
public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 
     HashMap<String,String> clickedItem = parent.getItemAtPosition(position); 
     String packageName = clickedItem.get("package"); 

     try{ 
     PackageManager packManager = getContext().getPackageManager(); 
     ApplicationInfo app = getContext().getPackageManager().getApplicationInfo(packageName , 0); 
     String appName = packManager.getApplicationLabel(app).toString(); 
AppData appData = (AppData) getActivity().getApplicationContext(); 
      appData.setPackageInfo(packageInfo); 
    } 
    catch(Exception e){ 
     e.printStackTrace(); 
    } 




    try { 
     Intent appInfo = new Intent(getActivity().getApplicationContext(), permdisabled.class); 
     startActivity(appInfo); 
    } 

    catch (Exception e) 
    { 
     Log.e(TAG, "error in intent"); 
    } 
}