无法从edittext检索值

Question

嗨我想从我的编辑文本检索某些值。

首先，当我没有输入任何东西时，我做了一个敬酒以通知我，没有文本输入，它的工作原理！

然后当我输入文字和这次，敬酒再次出现！当有文本输入..

显示吐司代码/检索文本：

public class ResetPassword extends Activity implements OnClickListener{ 

    // Creating JSON Parser object 
    JSONParser jParser = new JSONParser(); 

    private static final String TAG_PASSWORD = "password"; 
    private static final String TAG_SUCCESS = "success"; 
    private static final String TAG_PASS = "pass"; 

    String enteredPassword; 
    String changedPass; 
    String currentPass; 
    //String password; 

    // products JSONArray 
    JSONArray products = null; 

    //private static String url_member_login = "http://10.0.2.2/android_connect/get_login.php"; 
    private static String url_login = "http://10.0.2.2/android_connect/change_password.php"; 

    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.password); 

     this.setRequestedOrientation(
       ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); 

     ImageButton home = (ImageButton)findViewById(R.id.btn_home); 
     home.setOnClickListener(this); 


     Button save = (Button) findViewById(R.id.btn_save); 
     save.setOnClickListener(new View.OnClickListener() { 

      public void onClick(View v) 
       { 
       if (currentPass != null && changedPass != null) 
       { 
        new ResetPass().execute(); 
       }  
       else 
       { 
        /** A TEMPORARY DISPLAY FROM CUSTOM TOAST **/ 
        LayoutInflater inflater = getLayoutInflater(); 
        View layout = inflater.inflate(R.layout.customtoast, 
                (ViewGroup) findViewById(R.id.toast_layout_root)); 

        TextView text1 = (TextView) layout.findViewById(R.id.txt_engRecords); 
        TextView text2 = (TextView) layout.findViewById(R.id.txt_chiRecords); 

        text1.setText("Feature is temporarily unavailable"); 
        text2.setText("Unable to update "); 

        Toast toast = new Toast(getApplicationContext()); 
        toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0); 
        toast.setDuration(Toast.LENGTH_SHORT); 
        toast.setView(layout); 
        toast.show();    

       } 

       }}); 

    } 

    /** 
    * Background Async Task to Save product Details 
    * */ 

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

     /** 
     * Saving product 
     * */ 
     protected String doInBackground(String... args) { 

      // check json success tag 
      try { 
       // Building Parameters 

        EditText currentPassword = (EditText) findViewById(R.id.edit_current); 
        currentPass = currentPassword.getText().toString(); 

        EditText newPassword = (EditText) findViewById(R.id.edit_new); 
        changedPass = newPassword.getText().toString(); 

       List<NameValuePair> params = new ArrayList<NameValuePair>(); 
       params.add(new BasicNameValuePair(TAG_PASSWORD, changedPass)); 

       // sending modified data through http request 
       // Notice that update product url accepts POST method 
       JSONObject json = jParser.makeHttpRequest(url_login, 
         "GET", params); 

       int success = json.getInt(TAG_SUCCESS); 

       if (success == 1) { 
        finish(); 
       } else { 
        // failed to update product 
       } 
      } catch (JSONException e) { 
       e.printStackTrace(); 
      } 

      return null; 
     } 
    } 

Answer 1

无法访问UI元素从后台线程从doInBackground.you意味着必须通过的EditText值doInBackground作为参数作为：

首先在一个ArrayList作为添加的EditText vlaues：

public static List<String> arrlist = new ArrayList<String>(); 

    arrlist.add(currentPassword.getText().toString()); 
    arrlist.add(newPassword.getText().toString()); 

现在这个列表传递给的AsyncTask为：

new ResetPass().execute(arrlist); 

更改您的AsyncTask类为：

class ResetPass extends AsyncTask<ArrayList<String>, String, String> { 

     /** 
     * Saving product 
     * */ 
     protected String doInBackground(ArrayList<String>... args) { 

        // check json success tag 
        try { 
         // Building Parameters 
         ArrayList<String> result = new ArrayList<String>(); 
         result = passing[0]; //get passed arraylist 
         currentPass = result.get(0); // get old pass from ArrayList 
         changedPass = result.get(1);// get new pass from ArrayList 
         //...your code here 
        } catch (JSONException e) { 
         e.printStackTrace(); 
        } 

        return null; 
       } 
}