Question

我是android新手。我的登录应用程序运行正常，但当我将登录用户活动转换为片段并获得以下错误时：

错误：

package com.androidatc.customviewindrawer;

import android.app.Activity;
import android.app.Fragment;
import android.app.ProgressDialog;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;

import cz.msebera.android.httpclient.Header;

/**
 * 
 * Login Activity Class 
 *
 */
public class LoginFrag extends Fragment {
    // Progress Dialog Object
    ProgressDialog prgDialog;
    // Error Msg TextView Object
    TextView errorMsg;
    // Email Edit View Object
    EditText emailET;
    // Passwprd Edit View Object
    EditText pwdET;
    @Override

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.login, container, false);

        errorMsg = (TextView) rootView.findViewById(R.id.login_error);
        // Find Email Edit View control by ID
        emailET = (EditText) rootView.findViewById(R.id.loginEmail);
        // Find Password Edit View control by ID
        pwdET = (EditText) rootView.findViewById(R.id.loginPassword);
        // Instantiate Progress Dialog object
        prgDialog = new ProgressDialog(this.getActivity());
        // Set Progress Dialog Text
        prgDialog.setMessage("Please wait...");
        // Set Cancelable as False
        prgDialog.setCancelable(false);

        return rootView;
    }
    /**
     * Method gets triggered when Login button is clicked
     * 
     * @param view
     */
    public void loginUser(View view){
        // Get Email Edit View Value
        String email = emailET.getText().toString();
        // Get Password Edit View Value
        String password = pwdET.getText().toString();
        // Instantiate Http Request Param Object
        RequestParams params = new RequestParams();

                // Put Http parameter username with value of Email Edit View control
                params.put("username", email);
                // Put Http parameter password with value of Password Edit Value control
                params.put("password", password);

        final int DEFAULT_TIMEOUT = 200000 * 1000000000;

        // Make RESTful webservice call using AsyncHttpClient object
        AsyncHttpClient client = new AsyncHttpClient();
        client.setTimeout(DEFAULT_TIMEOUT);

        client.get("http://abc/ilsdi.pl?service=AuthenticatePatron", params ,new AsyncHttpResponseHandler() {


            public void onSuccess(int i, Header[] headers, byte[] bytes) {

                Toast.makeText(getActivity().getApplicationContext(), "XML File: " + headers, Toast.LENGTH_LONG).show();


            }

            @Override
            public void onFailure(int i, Header[] headers, byte[] bytes, Throwable throwable) {
                Toast.makeText(getActivity().getApplicationContext(), "Status code :" + i + "errmsg : " + throwable.getMessage(), Toast.LENGTH_LONG).show();
                Toast.makeText(getActivity().getApplicationContext(), "Unexpected Error occcured! [Most common Error: Device might not be connected to Internet or remote server is not up and running]", Toast.LENGTH_LONG).show();

            }


            public void onSuccess(String response) {
                // Hide Progress Dialog
                prgDialog.hide();
                Toast.makeText(getActivity().getApplicationContext(), "XML File: " + response, Toast.LENGTH_LONG).show();

                    Toast.makeText(getActivity().getApplicationContext(), "You are successfully logged in!", Toast.LENGTH_LONG).show();
                    navigatetoHomeActivity();
                    //e.printStackTrace();

            }
            // When the response returned by REST has Http response code other than '200'

            public void onFailure(int statusCode, Throwable error,
                                  String content) {
                // Hide Progress Dialog
                prgDialog.hide();
                // When Http response code is '404'
                if(statusCode == 404){
                    Toast.makeText(getActivity().getApplicationContext(), "Requested resource not found", Toast.LENGTH_LONG).show();
                }
                // When Http response code is '500'
                else if(statusCode == 500){
                    Toast.makeText(getActivity().getApplicationContext(), "Something went wrong at server end", Toast.LENGTH_LONG).show();
                }
                // When Http response code other than 404, 500
                else{
                    Toast.makeText(getActivity().getApplicationContext(), "Status code :" + statusCode + "errmsg : " + error.getMessage(), Toast.LENGTH_LONG).show();
                    Toast.makeText(getActivity().getApplicationContext(), "Unexpected Error occcured! [Most common Error: Device might not be connected to Internet or remote server is not up and running]", Toast.LENGTH_LONG).show();
                }
            }
        });



    }

    /**
     * Method which navigates from Login Activity to Home Activity
     */
    public void navigatetoHomeActivity(){
        Intent homeIntent = new Intent(getActivity().getApplicationContext(),HomeActivity.class);
        homeIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(homeIntent);
    }

    public interface OnFragmentInteractionListener {
        // TODO: Update argument type and name
        public void onFragmentInteraction(Uri uri);
    }





}

Main.activity

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="10dip" >

        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dip"
            android:text="@string/login_title"
            android:textSize="25sp"
            android:textStyle="bold" />

        <EditText
            android:id="@+id/loginEmail"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:hint="Enter your User ID"
            android:inputType="textEmailAddress" />

        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="15dip"
            android:text="@string/pwd" />

        <EditText
            android:id="@+id/loginPassword"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:hint="Enter Password"
            android:inputType="textPassword" />

        <TextView
            android:id="@+id/login_error"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:padding="10dip"
            android:textColor="#e30000"
            android:textStyle="bold" />

        <Button
            android:id="@+id/btnLogin"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="20dip"
            android:background="#ff6347"
            android:onClick="loginUser"
            android:text="Login"
            android:textColor="#fff" />

        <Button
            android:id="@+id/btnLinkToRegisterScreen"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="40dip"
            android:background="@null"
            android:onClick="navigatetoRegisterActivity"
            android:text="Signup"
            android:textColor="#228b22"
            android:textStyle="bold" />
    </LinearLayout>

</ScrollView>

LoginFrag.java

  apply plugin: 'com.android.application'

 android {
compileSdkVersion 23
buildToolsVersion "23.0.1"
defaultConfig {
    applicationId "com.package"
    minSdkVersion 15
    targetSdkVersion 23
    versionCode 6
    versionName "2.0.1"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
packagingOptions {
    exclude 'META-INF/LICENSE.txt'
    exclude 'META-INF/NOTICE'
    exclude 'META-INF/NOTICE.txt'
}
 }

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.1.0'

}

login.xml

<tr>

感谢任何建议。感谢

Answer 1

使用setOnClickListener。从XML中删除 android:onClick="loginUser"（仅适用于片段）

  <Button
                android:id="@+id/btnLogin"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="20dip"
                android:background="#ff6347"
                android:text="Login"
                android:textColor="#fff" />

然后在onCreateView部分

中添加此内容

    Button button = (Button) view.findViewById(R.id.btnLogin):
   button.setOnClickListener(new OnClickListener()
   {
             @Override
             public void onClick(View v)
             {
                // Add your code
             } 
   });

Answer 2

如果您使用的是android：onClick属性，它将调用活动的方法，而不是片段。

片段 - 无法在活动中找到按钮处理程序

2 个答案: