0

我有一个列表活动,其中包含所有处方的列表。当单击列表项活动时,会调用编辑处方来更新表格,并在成功时切换回列表活动并重新加载它。

但是当我回到列表活动错误更新后:无法启动活动组件信息 java.lang.nullpointerexception 被显示。

行号 堆栈跟踪中的 87 是 pid = extras.getString("TAG_PATIENT_ID"); 在 DocPresc 列表活动中。

这是我的列表活动:

public class DocPresc extends ListActivity {

    //public static Context ctx;
    JSONParser jParser = new JSONParser();

    ArrayList<HashMap<String, String>> productsList = new ArrayList<HashMap<String,String>>();

        String pid;
        JSONArray products = null;
        EditText ailm,date,comment;
        Button delete;

        JSONParser jsonParser = new JSONParser();

        // single product url
        private static final String url_patient_presc = "http://192.168.44.208/get_prescription.php";


        // JSON Node names
        private static final String TAG_SUCCESS = "success";
        private static final String TAG_PRODUCTS = "products";
      //  private static final String TAG_PATIENT_ID = "patient_id";
        private static final String TAG_AIL = "ailment";
        private static final String TAG_MED = "medicine_name";
        private static final String TAG_D1 = "qty1";
        private static final String TAG_D2 = "qty2";
        private static final String TAG_D3 = "qty3";
        private static final String TAG_DATE = "prescription_date";
        private static final String TAG_COM = "comment";
        private static final String TAG_DID = "dosage_id";

        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.docpresc);
            StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
              .detectDiskReads().detectDiskWrites().detectNetwork() // StrictMode is most commonly used to catch accidental disk or network access on the application's main thread
              .penaltyLog().build());

            this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                    WindowManager.LayoutParams.FLAG_FULLSCREEN);

            Intent i = getIntent();

             Bundle extras = i.getExtras();
             pid  = extras.getString("TAG_PATIENT_ID");
             System.out.println("Docpresc"+pid);

             ailm = (EditText)findViewById(R.id.ailment1);
             date = (EditText)findViewById(R.id.date1);
             comment = (EditText)findViewById(R.id.comment1);
             new LoadPrescriptions().execute();






        }





        class LoadPrescriptions extends AsyncTask<String, String, String> {


            protected String doInBackground(String... args) {
                // Building Parameters

                runOnUiThread(new Runnable() {
                       public void run() {

                try {
                    List<NameValuePair> params = new ArrayList<NameValuePair>();
                // getting JSON string from URL
                 params.add(new BasicNameValuePair("patient_id",pid));//search1.getText().toString()));
                 System.out.println("database"+pid);
                JSONObject json = jParser.makeHttpRequest(url_patient_presc, "GET", params);

                // Check your log cat for JSON reponse
            Log.d("All Patients: ", json.toString());


                    // Checking for SUCCESS TAG
                    int success = json.getInt(TAG_SUCCESS);

                    if (success == 1) {
                        // products found
                        // Getting Array of Products
                        products = json.getJSONArray(TAG_PRODUCTS);

                        //-----------------------------------
                        /*JSONObject product = products.getJSONObject(0);

                        ailm = (EditText)findViewById(R.id.ailment1);
                        ailm.setText(product.getString(TAG_AIL));*/
                        // looping through All Products
                        for (int i = 0; i < products.length(); i++) {
                            JSONObject c = products.getJSONObject(i);

                            // Storing each json item in variable

                            String medicine = c.getString(TAG_MED).toUpperCase();
                            String qty1 = c.getString(TAG_D1).toUpperCase();
                            String qty2 = c.getString(TAG_D2).toUpperCase();
                            String qty3 = c.getString(TAG_D3).toUpperCase();
                            String dsg_id = c.getString(TAG_DID).toUpperCase();
                            //String ail = c.getString(TAG_AIL).toUpperCase();

                            ailm.setText(c.getString(TAG_AIL));
                            date.setText(c.getString(TAG_DATE));
                            comment.setText(c.getString(TAG_COM));


                            // creating new HashMap
                            HashMap<String, String> map = new HashMap<String, String>();

                            // adding each child node to HashMap key => value


                            map.put(TAG_MED, medicine);
                            map.put(TAG_D1,qty1);
                            map.put(TAG_D2,qty2);
                            map.put(TAG_D3,qty3);
                            map.put(TAG_DID,dsg_id);

                            // adding HashList to ArrayList
                            productsList.add(map);  

                        }
                    } else {

                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
                       }
                       });
                return null;
            }


            /**
             * After completing background task Dismiss the progress dialog
             * **/
            protected void onPostExecute(String file_url) {
                // dismiss the dialog after getting all products
                //  pDialog.dismiss();
                // updating UI from Background Thread

                runOnUiThread(new Runnable() {
                    public void run() {

                        ListAdapter adapter = new SimpleAdapter(
                                DocPresc.this, productsList,
                                R.layout.list_item2, new String[] {
                                    TAG_MED,TAG_D1,TAG_D2,TAG_D3,TAG_DID},
                                    new int[] {R.id.med,R.id.d1,R.id.d2,R.id.d3,R.id.did });
                        // updating listview
                        //setListAdapter(adapter);
                        setListAdapter(adapter);

                    }

                 });

            }

        }



    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.items, menu);

        //menuSearch = menu.findItem(R.id.delete);
        //menuSearch.setVisible(false);

        return super.onCreateOptionsMenu(menu);
    }






        public boolean onOptionsItemSelected(MenuItem item) {

               // handle item selection

               switch (item.getItemId()) {

                  case R.id.add:

                      Bundle bundle = new Bundle();
                    bundle.putString("TAG_PATIENT_ID",pid );
                    System.out.println("bundle"+pid);
                    Intent i = new Intent(DocPresc.this,AddPresc.class);
                    i.putExtras(bundle);
                    startActivity(i);
                    //finish();


                     // startActivity(new Intent(DocPresc.this,AddPresc.class));
                     // finish();
                    //  Intent i = getIntent();
                     // finish();
                    //  startActivity(i);
                 // case R.id.print:




                     return true;

                  default:

                     return super.onOptionsItemSelected(item);

              }

            }

        public void onListItemClick(ListView lv, View v, int position, long id) {
            // TODO Auto-generated method stub

            //onAttach(getActivity());
            //lv.setAdapter(adapter);


            String did1 = ((TextView) v.findViewById(R.id.did)).getText().toString();
            String med1 = ((TextView) v.findViewById(R.id.med)).getText().toString();
            String dg1 = ((TextView) v.findViewById(R.id.d1)).getText().toString();
            String dg2 = ((TextView) v.findViewById(R.id.d2)).getText().toString();
            String dg3 = ((TextView) v.findViewById(R.id.d3)).getText().toString();

        //  System.out.println("all  patient"+id1);

            Bundle bundle = new Bundle();
            bundle.putString("TAG_DOSAGE_ID",did1 );
            bundle.putString("TAG_DOSAGE_ID1",med1 );
            bundle.putString("TAG_DOSAGE_ID2",dg1 );
            bundle.putString("TAG_DOSAGE_ID3",dg2 );
            bundle.putString("TAG_DOSAGE_ID4",dg3 );


            //  System.out.println("bundle"+id1);
            Intent i = new Intent(DocPresc.this,EditPresc.class);
            i.putExtras(bundle);
            startActivityForResult(i,100);




            //passData(date);


        }

        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
            super.onActivityResult(requestCode, resultCode, data);
            // if result code 100
            if (resultCode == 100) {
                // if result code 100 is received
                // means user edited/deleted product
                // reload this screen again
                Intent intent = getIntent();
                finish();
                startActivity(intent);
            }

        }



}

这是编辑处方活动

public class EditPresc extends Activity implements View.OnClickListener{

    //public static Context ctx;

        EditText medicine;
        EditText dosage1;
        EditText dosage2;
        EditText dosage3;
        Button edit;
        ImageButton up1 , up2,up3;
        ImageButton down1,down2,down3;
        String did,medi,q1,q2,q3;
        int count = 1;
        //JSONArray products = null;




        //int pid = "100";


        //private ProgressDialog pDialog;

        // JSON parser class
        JSONParser jsonParser = new JSONParser();

        // single product url
      //  private static final String url_getdosage = "http://192.168.44.208/get_dosage.php";
        private static final String url_updatedosage = "http://192.168.44.208/update_dosage.php";


        // JSON Node names
        private static final String TAG_SUCCESS = "success";
        private static final String TAG_PRODUCT = "product";
      //  private static final String TAG_PATIENT_ID = "patient_id";

        private static final String TAG_MED = "medicine_name";
        private static final String TAG_D1 = "qty1";
        private static final String TAG_D2 = "qty2";
        private static final String TAG_D3 = "qty3";


        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.editpresc);
            StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
              .detectDiskReads().detectDiskWrites().detectNetwork() // StrictMode is most commonly used to catch accidental disk or network access on the application's main thread
              .penaltyLog().build());

            this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                    WindowManager.LayoutParams.FLAG_FULLSCREEN);

            Intent i = getIntent();

             Bundle extras = i.getExtras();
             did  = extras.getString("TAG_DOSAGE_ID");
             medi  = extras.getString("TAG_DOSAGE_ID1");
             q1  = extras.getString("TAG_DOSAGE_ID2");
             q2  = extras.getString("TAG_DOSAGE_ID3");
             q3  = extras.getString("TAG_DOSAGE_ID4");

             medicine = (EditText)findViewById(R.id.atxt1);
             dosage1 = (EditText)findViewById(R.id.text1);
             dosage2 = (EditText)findViewById(R.id.text2);
             dosage3 = (EditText)findViewById(R.id.text3);

             medicine.setText(medi);
             dosage1.setText(q1);
             dosage2.setText(q2);
             dosage3.setText(q3);






             System.out.println("Editpresc"+did);

            //send = (Button)findViewById(R.id.b1);
            up1=(ImageButton)findViewById(R.id.up1);
         down1=(ImageButton)findViewById(R.id.down1);
         dosage1=(EditText)findViewById(R.id.text1);
        up2=(ImageButton)findViewById(R.id.up2);
         down2=(ImageButton)findViewById(R.id.down2);
         dosage2=(EditText)findViewById(R.id.text2);
        up3=(ImageButton)findViewById(R.id.up3);
         down3=(ImageButton)findViewById(R.id.down3);
         dosage3=(EditText)findViewById(R.id.text3);
         //dosage1.setText("1");
         up1.setOnClickListener(this);
         up2.setOnClickListener(this);
        up3.setOnClickListener(this);
        down1.setOnClickListener(this);
        down2.setOnClickListener(this);
        down3.setOnClickListener(this);
        //ailment = (EditText)findViewById(R.id.atxt);

        //comment = (EditText)findViewById(R.id.ctxt);
        //presc=(EditText)findViewById(R.id.presc_id);
        edit = (Button)findViewById(R.id.save);

       //   new GetDosage().execute();



        edit.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                 new EditDosageDetails().execute();

            }
        });




        }

    private class EditDosageDetails extends AsyncTask<String, Void, String> {
        //  JSONObject product;

        protected String doInBackground(String... args) {

            //JSONObject product = null;
            //id.setText(100);
            // updating UI from Background Thread
            runOnUiThread(new Runnable() {
               public void run() {


                   String med = medicine.getText().toString();
                   System.out.println("editdosage"+med);
                   String do1 = dosage1.getText().toString();
                   String do2 = dosage2.getText().toString();
                   String do3 = dosage3.getText().toString();
                   // Building Parameters
                   List<NameValuePair> params = new ArrayList<NameValuePair>();

                   params.add(new BasicNameValuePair("medicine_name", med));

                   params.add(new BasicNameValuePair("dosage_id", did));
                   params.add(new BasicNameValuePair("qty1", do1));
                   params.add(new BasicNameValuePair("qty2", do2));
                   params.add(new BasicNameValuePair("qty3", do3));

                       JSONObject json = jsonParser.makeHttpRequest(url_updatedosage,
                               "POST", params);
                        // json success tag
                      // Log.d("Create Response", json.toString());

                       // check for success tag
                       try {
                           int success = json.getInt(TAG_SUCCESS);

                           if (success == 1) {
                               // successfully created product
                               Intent i = getIntent();
                               setResult(100, i);
                               finish();
                               // super.onBackPressed();
                               // closing this screen

                           } else {
                               // failed to create product
                           }
                       } catch (JSONException e) {
                           e.printStackTrace();
                       }
         //      }
               }

            });
                    //return product;
             return null;

          //  });

           // return product;
        }

    }





    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.items, menu);

        //menuSearch = menu.findItem(R.id.delete);
        //menuSearch.setVisible(false);

        return super.onCreateOptionsMenu(menu);
    }



        @Override
        public void onClick(View v) {
            switch(v.getId()){

            case R.id.up1:
                int a=Integer.parseInt(dosage1.getText().toString());
                int b = a+1;
                dosage1.setText(new Integer(b).toString());
                break;

            case R.id.down1:
                 a=Integer.parseInt(dosage1.getText().toString());
                 b = a-1;
                dosage1.setText(new Integer(b).toString());
                break;

            case R.id.up2:
                 a=Integer.parseInt(dosage2.getText().toString());
                 b = a+1;
                dosage2.setText(new Integer(b).toString());
                break;

            case R.id.down2:
                a=Integer.parseInt(dosage2.getText().toString());
                 b = a-1;
               dosage2.setText(new Integer(b).toString());

            case R.id.up3:
                a=Integer.parseInt(dosage3.getText().toString());
                 b = a+1;
               dosage3.setText(new Integer(b).toString());
               break;

            case R.id.down3:
                a=Integer.parseInt(dosage3.getText().toString());
                 b = a-1;
               dosage3.setText(new Integer(b).toString());
               break;
            //case R.id.save:
            //  System.out.println("save pressed");



            }


        }



}

这是堆栈跟踪

06-13 17:59:35.558: E/AndroidRuntime(26369): FATAL EXCEPTION: main
06-13 17:59:35.558: E/AndroidRuntime(26369): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.actionbar/com.example.actionbar.DocPresc}: java.lang.NullPointerException
06-13 17:59:35.558: E/AndroidRuntime(26369):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
06-13 17:59:35.558: E/AndroidRuntime(26369):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2122)
06-13 17:59:35.558: E/AndroidRuntime(26369):    at android.app.ActivityThread.access$600(ActivityThread.java:140)
06-13 17:59:35.558: E/AndroidRuntime(26369):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1228)
06-13 17:59:35.558: E/AndroidRuntime(26369):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-13 17:59:35.558: E/AndroidRuntime(26369):    at android.os.Looper.loop(Looper.java:137)
06-13 17:59:35.558: E/AndroidRuntime(26369):    at android.app.ActivityThread.main(ActivityThread.java:4895)
06-13 17:59:35.558: E/AndroidRuntime(26369):    at java.lang.reflect.Method.invokeNative(Native Method)
06-13 17:59:35.558: E/AndroidRuntime(26369):    at java.lang.reflect.Method.invoke(Method.java:511)
06-13 17:59:35.558: E/AndroidRuntime(26369):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:994)
06-13 17:59:35.558: E/AndroidRuntime(26369):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:761)
06-13 17:59:35.558: E/AndroidRuntime(26369):    at dalvik.system.NativeStart.main(Native Method)
06-13 17:59:35.558: E/AndroidRuntime(26369): Caused by: java.lang.NullPointerException
06-13 17:59:35.558: E/AndroidRuntime(26369):    at com.example.actionbar.DocPresc.onCreate(DocPresc.java:87)
06-13 17:59:35.558: E/AndroidRuntime(26369):    at android.app.Activity.performCreate(Activity.java:5163)
06-13 17:59:35.558: E/AndroidRuntime(26369):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
06-13 17:59:35.558: E/AndroidRuntime(26369):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2061)
06-13 17:59:35.558: E/AndroidRuntime(26369):    ... 11 more
4

1 回答 1

0

捆绑附加服务 = i.getExtras(); pid = extras.getString("TAG_PATIENT_ID"); 您在 onCreate 中编写了这个,但有一个问题如果此处未选择任何项目,则没有 Extra:

public boolean onOptionsItemSelected(MenuItem item) {

           // handle item selection

           switch (item.getItemId()) {

              case R.id.add:

                  Bundle bundle = new Bundle();
                bundle.putString("TAG_PATIENT_ID",pid );
                System.out.println("bundle"+pid);
                Intent i = new Intent(DocPresc.this,AddPresc.class);
                i.putExtras(bundle);
                startActivity(i);
                //finish();

我不确定我的答案,或者如果说废话,但我看不到你的额外内容如何在 onCreate 中获得,然后其他活动添加额外内容并调用它

于 2013-06-13T14:44:40.690 回答