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方法不在片段中工作（但在作業中工作）

2013-06-30 137 views
1

我正在使用片段創建應用程序。我有一個在一個活動中工作的代碼，但是相同的代碼在一個片段中不起作用。這裏是我的代碼：方法不在片段中工作（但在作業中工作）

package com.example.currencyconverter; 


import java.io.IOException; 
import java.io.PrintWriter; 
import java.io.StringWriter; 
import java.text.DecimalFormat; 

import org.apache.http.client.HttpClient; 
import org.apache.http.client.ResponseHandler; 
import org.apache.http.client.methods.HttpGet; 
import org.apache.http.impl.client.BasicResponseHandler; 
import org.apache.http.impl.client.DefaultHttpClient; 

import android.app.Fragment; 
import android.app.ProgressDialog; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.ViewGroup; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.RadioButton; 
import android.widget.RadioGroup; 
import android.widget.Spinner; 
import android.widget.TextView; 


public class MainActivity extends Fragment implements OnClickListener { 

    ProgressDialog progressBar; 
    EditText edittextdollars; 
    EditText edittexteuros; 
    TextView dollars; 
    TextView euros; 
    RadioButton dtoe; 
    RadioButton etod; 
    RadioGroup radiogroup; 
    Spinner spinner1; 
    Spinner spinner2; 
    Button calculate; 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     return inflater.inflate(R.layout.activity_main, container, false); 

    } 

    private void addListenerOnButton() { 
     spinner1 = (Spinner) getView().findViewById(R.id.spinner1); 
     spinner2 = (Spinner) getView().findViewById(R.id.spinner2); 
     calculate = (Button) getView().findViewById(R.id.calculate); 
     edittextdollars = (EditText) getView().findViewById(R.id.edittextdollars); 
     edittexteuros = (EditText) getView().findViewById(R.id.edittexteuros); 
    } 

    public interface CurrencyConverter { 
     public double convert(String currencyFrom, String currencyTo) throws Exception; 
    } 

    public class YahooCurrencyConverter implements CurrencyConverter { 
     public double convert(String currencyFrom, String currencyTo) throws IOException { 
      HttpClient httpclient = new DefaultHttpClient(); 
      HttpGet httpGet = new HttpGet("http://quote.yahoo.com/d/quotes.csv?s=" + currencyFrom + currencyTo + "=X&f=l1&e=.csv"); 
      ResponseHandler <String> responseHandler = new BasicResponseHandler(); 
      String responseBody = httpclient.execute(httpGet, responseHandler); 
      httpclient.getConnectionManager().shutdown(); 
      return Double.parseDouble(responseBody); 
     } 


    } 

    @Override 
    public void onClick(View v) { 
     String text1 = spinner1.getSelectedItem().toString().trim(); 
     String text2 = spinner2.getSelectedItem().toString().trim(); 


     if (text1.equals("US Dollar - USD") && text2.equals("Euro - EUR") && edittextdollars.length() > 0 && edittexteuros.length() == 0) { 
      convertvalues("USD", "EUR"); 
     } 
     if (text1.equals("US Dollar - USD") && text2.equals("Euro - EUR") && edittexteuros.length() > 0 && edittextdollars.length() == 0) { 
      convertvalues2("EUR", "USD"); 
     } 
     if (text1.equals("Euro - EUR") && text2.equals("US Dollar - USD") && edittextdollars.length() > 0 && edittexteuros.length() == 0) { 
      convertvalues("EUR", "USD"); 
     } 
     if (text1.equals("Euro - EUR") && text2.equals("US Dollar - USD") && edittexteuros.length() > 0 && edittextdollars.length() == 0) { 
      convertvalues2("USD", "EUR"); 
     } 
     if (text1.equals("Euro - EUR") && text2.equals("Euro - EUR") && edittextdollars.length() > 0 && edittexteuros.length() == 0) { 
      convertEurostoEuros(); 
     } 
     if (text1.equals("Euro - EUR") && text2.equals("Euro - EUR") && edittexteuros.length() > 0 && edittextdollars.length() == 0) { 
      OppositeOfConvertEurostoEuros(); 
     } 
     if (text1.equals("US Dollar - USD") && text2.equals("US Dollar - USD") && edittextdollars.length() > 0 && edittexteuros.length() == 0) { 
      convertDollarstoDollars(); 
     } 
     if (text1.equals("US Dollar - USD") && text2.equals("US Dollar - USD") && edittexteuros.length() > 0 && edittextdollars.length() == 0) { 
      OppositeOfConvertDollarstoDollars(); 
     } 
     if (text1.equals("Indian Rupee - INR") && text2.equals("Indian Rupee - INR") && edittextdollars.length() > 0 && edittexteuros.length() == 0) { 
      convertEurostoEuros(); 
     } 
     if (text1.equals("Indian Rupee - INR") && text2.equals("Indian Rupee - INR") && edittexteuros.length() > 0 && edittextdollars.length() == 0) { 
      OppositeOfConvertDollarstoDollars(); 
     } 
     if (text1.equals("Indian Rupee - INR") && text2.equals("US Dollar - USD") && edittextdollars.length() > 0 && edittexteuros.length() == 0) { 
      convertvalues("INR", "USD"); 
     } 
     if (text1.equals("Indian Rupee - INR") && text2.equals("US Dollar - USD") && edittexteuros.length() > 0 && edittextdollars.length() == 0) { 
      convertvalues2("USD", "INR"); 
     } 
     if (text1.equals("Indian Rupee - INR") && text2.equals("Euro - EUR") && edittextdollars.length() > 0 && edittexteuros.length() == 0) { 
      convertvalues("INR", "EUR"); 
     } 
     if (text1.equals("Indian Rupee - INR") && text2.equals("Euro - EUR") && edittexteuros.length() > 0 && edittextdollars.length() == 0) { 
      convertvalues2("EUR", "INR"); 
     } 
     if (text1.equals("US Dollar - USD") && text2.equals("Indian Rupee - INR") && edittextdollars.length() > 0 && edittexteuros.length() == 0) { 
      convertvalues("USD", "INR"); 
     } 
     if (text1.equals("US Dollar - USD") && text2.equals("Indian Rupee - INR") && edittexteuros.length() > 0 && edittextdollars.length() == 0) { 
      convertvalues2("INR", "USD"); 
     } 
     if (text1.equals("Euro - EUR") && text2.equals("Indian Rupee - INR") && edittexteuros.length() > 0 && edittextdollars.length() == 0) { 
      convertvalues2("INR", "EUR"); 
     } 
     if (text1.equals("Euro - EUR") && text2.equals("Indian Rupee - INR") && edittextdollars.length() > 0 && edittexteuros.length() == 0) { 
      convertvalues("EUR", "INR"); 
     } 



     if (text1.equals("Japanese Yen - JPY") && text2.equals("Japanese Yen - JPY") && edittextdollars.length() > 0 && edittexteuros.length() == 0) { 
      convertvalues("JPY", "JPY"); 
     } 
     if (text1.equals("Japanese Yen - JPY") && text2.equals("Japanese Yen - JPY") && edittexteuros.length() > 0 && edittextdollars.length() == 0) { 
      convertvalues2("JPY", "JPY"); 
     } 
     if (text1.equals("Japanese Yen - JPY") && text2.equals("US Dollar - USD") && edittextdollars.length() > 0 && edittexteuros.length() == 0) { 
      convertvalues("JPY", "USD"); 
     } 
     if (text1.equals("Japanese Yen - JPY") && text2.equals("US Dollar - USD") && edittexteuros.length() > 0 && edittextdollars.length() == 0) { 
      convertvalues2("USD", "JPY"); 
     } 
     if (text1.equals("Japanese Yen - JPY") && text2.equals("Indian Rupee - INR") && edittextdollars.length() > 0 && edittexteuros.length() == 0) { 
      convertvalues("JPY", "INR"); 
     } 
     if (text1.equals("Japanese Yen - JPY") && text2.equals("Indian Rupee - INR") && edittexteuros.length() > 0 && edittextdollars.length() == 0) { 
      convertvalues2("INR", "JPY"); 
     } 
     if (text1.equals("Japanese Yen - JPY") && text2.equals("Euro - EUR") && edittextdollars.length() > 0 && edittexteuros.length() == 0) { 
      convertvalues("JPY", "EUR"); 
     } 
     if (text1.equals("Japanese Yen - JPY") && text2.equals("Euro - EUR") && edittexteuros.length() > 0 && edittextdollars.length() == 0) { 
      convertvalues2("EUR", "JPY"); 
     } 



     if (text1.equals("US Dollar - USD") && text2.equals("Japanese Yen - JPY") && edittextdollars.length() > 0 && edittexteuros.length() == 0) { 
      convertvalues("USD", "JPY"); 
     } 
     if (text1.equals("US Dollar - USD") && text2.equals("Japanese Yen - JPY") && edittexteuros.length() > 0 && edittextdollars.length() == 0) { 
      convertvalues2("JPY", "USD"); 
     } 
     if (text1.equals("Euro - EUR") && text2.equals("Japanese Yen - JPY") && edittextdollars.length() > 0 && edittexteuros.length() == 0) { 
      convertvalues("EUR", "JPY"); 
     } 
     if (text1.equals("Euro - EUR") && text2.equals("Japanese Yen - JPY") && edittexteuros.length() > 0 && edittextdollars.length() == 0) { 
      convertvalues2("JPY", "EUR"); 
     } 
     if (text1.equals("Indian Rupee - INR") && text2.equals("Japanese Yen - JPY") && edittextdollars.length() > 0 && edittexteuros.length() == 0) { 
      convertvalues("INR", "JPY"); 
     } 
     if (text1.equals("Indian Rupee - INR") && text2.equals("Japanese Yen - JPY") && edittexteuros.length() > 0 && edittextdollars.length() == 0) { 
      convertvalues2("JPY", "INR"); 
     } else { 
      System.out.println(""); 
     } 
    } 

    public String convertvalues(String convertfrom, String convertto) { 
     double current; 
     double val = Double.parseDouble(edittextdollars.getText().toString()); 
     DecimalFormat df = new DecimalFormat(".##"); 
     YahooCurrencyConverter ycc = new YahooCurrencyConverter(); 
     try { 
      current = ycc.convert(convertfrom, convertto); 
      edittexteuros.setText(df.format(val * current)); 
      return "passed"; 
     } catch (Exception e) { 
      StringWriter errors = new StringWriter(); 
      e.printStackTrace(new PrintWriter(errors)); 
      return errors.toString(); 
     } 
    } 

    public String convertvalues2(String convertfrom2, String convertto2) { 
     double current; 
     double val = Double.parseDouble(edittexteuros.getText().toString()); 
     DecimalFormat df = new DecimalFormat(".##"); 
     YahooCurrencyConverter ycc = new YahooCurrencyConverter(); 
     try { 
      current = ycc.convert(convertfrom2, convertto2); 
      edittextdollars.setText(df.format(val * current)); 
      return "passed"; 
     } catch (Exception e) { 
      StringWriter errors = new StringWriter(); 
      e.printStackTrace(new PrintWriter(errors)); 
      return errors.toString(); 
     } 

    } 

    protected void convertEurostoDollars() { 
     double val = Double.parseDouble(edittexteuros.getText().toString()); 
     DecimalFormat df = new DecimalFormat(".##"); 
     edittextdollars.setText(df.format(val * 1.33)); 

    } 

    protected void convertEurostoEuros() { 
     double val = Double.parseDouble(edittextdollars.getText().toString()); 
     DecimalFormat df = new DecimalFormat(".##"); 
     edittexteuros.setText(df.format(val * 1)); 
    } 

    protected void convertDollarstoDollars() { 
     double val = Double.parseDouble(edittextdollars.getText().toString()); 
     DecimalFormat df = new DecimalFormat(".##"); 
     edittexteuros.setText(df.format(val * 1)); 
    } 

    protected void OppositeOfConvertEurostoDollars() { 
     double val = Double.parseDouble(edittextdollars.getText().toString()); 
     DecimalFormat df = new DecimalFormat(".##"); 
     edittexteuros.setText(df.format(val * 1.33)); 
    } 

    protected void OppositeOfConvertDollarstoEuros() { 
     double val = Double.parseDouble(edittexteuros.getText().toString()); 
     DecimalFormat df = new DecimalFormat(".##"); 
     edittextdollars.setText(df.format(val * 0.75)); 
    } 

    protected void OppositeOfConvertEurostoEuros() { 
     double val = Double.parseDouble(edittexteuros.getText().toString()); 
     DecimalFormat df = new DecimalFormat(".##"); 
     edittextdollars.setText(df.format(val * 1)); 
    } 

    protected void OppositeOfConvertDollarstoDollars() { 
     double val = Double.parseDouble(edittexteuros.getText().toString()); 
     DecimalFormat df = new DecimalFormat(".##"); 
     edittextdollars.setText(df.format(val * 1)); 
    } 
}

這裏是我的只是按鈕的xml：

<Button 
android:id="@+id/calculate" 
android:layout_width="320dp" 
android:layout_height="wrap_content" 
android:layout_alignParentLeft="true" 
android:layout_below="@+id/edittexteuros" 
android:text="@string/calculate" 
android:onClick="onClick"/>

對於額外的參考，這裏是我的應用程序崩潰，其中的logcat：

06-30 01:45:56.807: E/AndroidRuntime(1752): FATAL EXCEPTION: main 
06-30 01:45:56.807: E/AndroidRuntime(1752): java.lang.IllegalStateException: Could not find a method onClick(View) in the activity class com.example.currencyconverter.MainActivity2 for onClick handler on view class android.widget.Button with id 'calculate' 
06-30 01:45:56.807: E/AndroidRuntime(1752):  at android.view.View$1.onClick(View.java:3586) 
06-30 01:45:56.807: E/AndroidRuntime(1752):  at android.view.View.performClick(View.java:4204) 
06-30 01:45:56.807: E/AndroidRuntime(1752):  at android.view.View$PerformClick.run(View.java:17355) 
06-30 01:45:56.807: E/AndroidRuntime(1752):  at android.os.Handler.handleCallback(Handler.java:725) 
06-30 01:45:56.807: E/AndroidRuntime(1752):  at android.os.Handler.dispatchMessage(Handler.java:92) 
06-30 01:45:56.807: E/AndroidRuntime(1752):  at android.os.Looper.loop(Looper.java:137) 
06-30 01:45:56.807: E/AndroidRuntime(1752):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
06-30 01:45:56.807: E/AndroidRuntime(1752):  at java.lang.reflect.Method.invokeNative(Native Method) 
06-30 01:45:56.807: E/AndroidRuntime(1752):  at java.lang.reflect.Method.invoke(Method.java:511) 
06-30 01:45:56.807: E/AndroidRuntime(1752):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
06-30 01:45:56.807: E/AndroidRuntime(1752):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
06-30 01:45:56.807: E/AndroidRuntime(1752):  at dalvik.system.NativeStart.main(Native Method) 
06-30 01:45:56.807: E/AndroidRuntime(1752): Caused by: java.lang.NoSuchMethodException: onClick [class android.view.View] 
06-30 01:45:56.807: E/AndroidRuntime(1752):  at java.lang.Class.getConstructorOrMethod(Class.java:460) 
06-30 01:45:56.807: E/AndroidRuntime(1752):  at java.lang.Class.getMethod(Class.java:915) 
06-30 01:45:56.807: E/AndroidRuntime(1752):  at android.view.View$1.onClick(View.java:3579) 
06-30 01:45:56.807: E/AndroidRuntime(1752):  ... 11 more

什麼我做錯了嗎？這裏發生了什麼？任何幫助是極大的讚賞。

來源

2013-06-30 user2507301

+0

您是否嘗試以編程方式爲該按鈕創建'onClick'偵聽器？ –

+0

是的，我有，但它仍然不起作用 – user2507301

+0

當你做了嗎？ –

回答

0

我不確定你是否缺少一些代碼或什麼，但addListenerOnButton（）方法永遠不會被調用。我假設你可能在你的activity的onCreate（）中調用了這個。您可能還注意到，您無法在片段的oncCreate（）中使用getView（），因爲在onCreateView（）內部調用inflate之前，根視圖不可訪問。

我建議您採取以下措施解決您的問題。

首先從xml中刪除onClick行，因爲您將不再需要該行，因爲我們將以編程方式註冊按鈕。

您還可以將您在addListernOnButton（）中執行的所有工作移動到onCreateView（）中。

View rootView; 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    rootView = inflater.inflate(R.layout.activity_main, container, false); 
    spinner1 = (Spinner) rootView.findViewById(R.id.spinner1); 
    spinner2 = (Spinner) rootView.findViewById(R.id.spinner2); 
    calculate = (Button) rootView.findViewById(R.id.calculate); 
    calculate.setOnClickListener(this); 
    edittextdollars = (EditText) rootView.findViewById(R.id.edittextdollars); 
    edittexteuros = (EditText) rootView.findViewById(R.id.edittexteuros); 
    return rootView; 
}

來源

2013-06-30 04:04:03 btse

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