Question

我的简单Query DB程序通过JSON到PHP - MySQL DB。

我收到了一条消息：显示错误！android.view.ViewRootImpl $ CalledFromWrongThreadException：只有创建视图层次结构的原始线程才能触及其视图。

当我做查询时。

我已尝试并修改程序，使用EditText输入branchname，通过JSON查询到php的结果是可以的。

但是在从EditText更改为Spindle之后，我得到了上面的消息。

有人可以提供帮助吗？非常感谢。

public class Querybybranch extends Activity implements OnClickListener {
      private ProgressDialog pDialog;
      JSONParser jsonParser = new JSONParser();

      Spinner spinner3;

      Button submit5;    
      TextView tv5;      // TextView to show the result of MySQL query 

      String branchname = null ;   

      String returnString;   // to store the result of MySQL query after decoding JSON


      private static String url_queryname = "http://vciwhereabout.ddns.net/waboutbybranch.php";

      private static String TAG_SUCCESS = "success";      

      /** Called when the activity is first created. */
      @Override
      public void onCreate(Bundle savedInstanceState) 
    {
       StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
       .detectDiskReads().detectDiskWrites().detectNetwork() 
       .penaltyLog().build());
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_jsonuse5);

          Spinner spinner3 = (Spinner) findViewById(R.id.spinner3);

          ArrayAdapter<CharSequence> adapter3 = ArrayAdapter.createFromResource(this,
          R.array.branchtypearray, android.R.layout.simple_spinner_item);

          adapter3.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

          spinner3.setAdapter(adapter3);

          addListenerOnSpinnerItemSelection();

          branchname = spinner3.getSelectedItem().toString();

          submit5 = (Button) findViewById(R.id.btnsubmit5);
          tv5 = (TextView) findViewById(R.id.showresult5);
            submit5.setOnClickListener(new View.OnClickListener()
          {        
           public void onClick(View v) {

               new AttemptQueryBranchName().execute();     

          } 

         });
        }

      public void addListenerOnSpinnerItemSelection() {

          spinner3 = (Spinner) findViewById(R.id.spinner3);   
          spinner3.setOnItemSelectedListener(new CustomOnItemSelectedListener());
        }

        public void addListenerOnButton() {

          spinner3 = (Spinner) findViewById(R.id.spinner3);
          spinner3.setOnItemSelectedListener(new CustomOnItemSelectedListener()); 
        }             


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

      @Override
      protected void onPreExecute() {
          super.onPreExecute();
          pDialog = new ProgressDialog(Querybybranch.this);
          pDialog.setMessage("Attempting query...");
          pDialog.setIndeterminate(false);
          pDialog.setCancelable(true);
          pDialog.show();
      }

      @Override
      protected String doInBackground(String... args) {
          ArrayList<NameValuePair> postParameters = new ArrayList<NameValuePair>();

          postParameters.add(new BasicNameValuePair("branchname", branchname));

//            postParameters.add(new BasicNameValuePair("branchname", branchname.getText().toString()));

          String response = null;

          try{

              response = CustomHttpClient.executeHttpPost(
                      "http://vciwhereabout.ddns.net/waboutbybranch.php", postParameters);

          String result = response.toString();  

            //parse json data
               try{

                returnString = "";    

                JSONObject object = new JSONObject(result);
                JSONArray jArray = object.getJSONArray("posts");

                       for (int i = 0; i < jArray.length(); i++) {
                          JSONObject json_data = jArray.getJSONObject(i);     

                          Log.i("log_tag","post_id: "+json_data.getInt("post_id")+
                                       ", username: "+json_data.getString("username")+
                                       ", name: "+json_data.getString("name")+
                                       ", division: "+json_data.getString("division")+
                                       ", branchname: "+json_data.getString("branchname")+
                                       ", fdate: "+json_data.getString("fdate")+
                                       ", tdate: "+json_data.getString("tdate")+
                                       ", ftime: "+json_data.getString("ftime")+
                                       ", ttime: "+json_data.getString("ttime")+
                                       ", type_name: "+json_data.getString("type_name")+
                                       ", note: "+json_data.getString("note")+
                                       ", custbranch: "+json_data.getString("custbranch")+
                                       ", custname: "+json_data.getString("custname")+
                                       ", custaddr: "+json_data.getString("custaddr")+
                                       ", custcity: "+json_data.getString("custcity")
                                   );
                               //Get an output to the screen

                               returnString += "\n" + "Post ID  :" + "\t" + json_data.getString("post_id")
                               + "\n" + "User-id       :" + json_data.getString("username")
                               + "\n" + "Name        :"  + "\t" + json_data.getString("name")
                               + "\n" + "Division      :"  + "\t" + json_data.getString("division")
                               + "\n" + "HO/Branch :" + json_data.getString("branchname") 
                               + "\n" + "From Date :" + json_data.getString("fdate") 
                               + "\n" + "To Date     :" + json_data.getString("tdate") 
                               + "\n" + "From Time :" + json_data.getString("ftime") 
                               + "\n" + "To Time     :" + json_data.getString("ttime")
                               + "\n" + "Req.Type: :" + json_data.getString("type_name")
                               + "\n" + "Note :" + json_data.getString("note") 
                               + "\n" + "Cust/Br. :" + json_data.getString("custbranch") 
                               + "\n" + "Cust.Name:" + json_data.getString("custname") 
                               + "\n" + "Address :" + json_data.getString("custaddr") 
                               + "\n" + "City       :" + json_data.getString("custcity")+ "\n" 
                               + "------------------------" + "\n" ;

                                                           }
                   }

               catch(JSONException e){
                       Log.e("log_tag", "Error parsing data "+e.toString());
                       returnString += "No Records found for this Query" ;
                                      } 

               try{
                tv5.setText(returnString);
                   }
               catch(Exception e){
                Log.e("log_tag","Error in Display!" + e.toString());;          
                       }
                  }
               catch (Exception e) {
                   Log.e("log_tag","Error in http connection!!" + e.toString());

                 }
          if (response == "null")  { 
              Toast.makeText(Querybybranch.this, "branchname not found", Toast.LENGTH_LONG).show();
           }
              else {}

          return null;
//            return response;

  }

      protected void onPostExecute(String file_url) {
          // dismiss the dialog once product deleted
          pDialog.dismiss();
          if (file_url != null) {
              Toast.makeText(Querybybranch.this, file_url, Toast.LENGTH_LONG).show();
               }
//                else {
//                    Toast.makeText(Querynameentry21.this, "User not found", Toast.LENGTH_LONG).show();
//                }
          }
      }

    @Override
  public void onClick(View v) {
      // TODO Auto-generated method stub

  }
  }

这是主轴阵列：

> <string-array name="branchtypearray">
>         <item>HO VCI</item>
>         <item>Cabang Jakarta 1</item>
>         <item>Cabang Jakarta 2</item>
>         <item>Cabang Bandung</item>
>         <item>Cabang Semarang</item>
>         <item>Cabang Surabaya</item>
>         <item>Cabang Denpasar</item>
>         <item>Cabang REGIONAL BARAT</item>
>         <item>Cabang REGIONAL TIMUR</item>
>         <item>Pabrik</item>
>         <item>HO 3C</item>
>     </string-array>

加上活动的布局：

> <?xml version="1.0" encoding="utf-8"?> <LinearLayout
> xmlns:android="http://schemas.android.com/apk/res/android"
>     android:layout_width="fill_parent"
>     android:layout_height="fill_parent"
>     android:orientation="vertical" >
> 
> <!-- Cust/Branch Namelabel -->
>     <TextView
>         android:layout_width="fill_parent"
>         android:layout_height="wrap_content"
>         android:textAppearance="?android:attr/textAppearanceLarge"
>         android:textColor="#43bd00"
>         android:textSize="20sp"
>         android:text="Branch Name to be Query" />
>         
>     <Spinner
>         android:id="@+id/spinner3"
>         android:layout_width="match_parent"
>         android:layout_height="wrap_content"
>         android:entries="@array/branchtypearray"
>         />
>     <Button
>         android:id="@+id/btnsubmit5"
>         android:layout_width="wrap_content"
>         android:layout_height="wrap_content"
>         android:text="Submit"
>         android:layout_gravity="center"
>          />  <LinearLayout
>                 android:id="@+id/box"
>                 android:layout_width="match_parent"
>                 android:layout_height="wrap_content"
>                 android:layout_margin="1dp"
>                 android:orientation="vertical"
>                 android:padding="1dp" >
>                 
>              <ImageView
>                 android:id="@+id/imageView1"
>                 android:layout_width="wrap_content"
>                 android:layout_height="wrap_content"
>                 android:src="@drawable/logo3s" 
>                 android:gravity="center_horizontal"
>                 />                           
>          
>            <ScrollView
>     android:layout_width="fill_parent"
>     android:lines="20"
>     android:layout_height="390dip" >        
>            <TextView
>         android:id="@+id/showresult5"
>         android:layout_width="fill_parent"
>         android:layout_height="wrap_content"
>         android:singleLine="false"
>         android:textAppearance="?android:attr/textAppearanceLarge"
>   
>         android:paddingBottom="2dip"
>         android:paddingLeft="45dip"
>         android:textColor="#5d5d5d"
>       />
>          </ScrollView>          </LinearLayout>   </LinearLayout>

输出屏幕只是空白＆＃39;没有出现。

当我使用EditText（更改为＆＃34;主轴＆＃34;并且遇到问题）时，PHP和数据库正常并且测试结果良好。

Answer 1

按照Mike M的建议，在postExecute上移动了以下语句后，问题解决了。非常感谢Mike M。

> try{
>                 tv5.setText(returnString);
>                    }
>                catch(Exception e){
>                 Log.e("log_tag","Error in Display!" + e.toString());;


                   }

Android显示错误显示android.view.ViewRootImpl $ CalledFromWrongThreadException

1 个答案: