无法执行android的方法：onClick - 翻新

我试图从Web API检索数据。我用改装，我所做的接口，但是当我尝试使用它，我有一个例外声明无法执行android的方法：onClick - 翻新

E/AndroidRuntime: FATAL EXCEPTION: main 
       Process: com.wind.wind, PID: 2388 
       java.lang.IllegalStateException: Could not execute method for android:onClick 
        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293) 
        at android.view.View.performClick(View.java:4438) 
        at android.view.View$PerformClick.run(View.java:18422) 
        at android.os.Handler.handleCallback(Handler.java:733) 
        at android.os.Handler.dispatchMessage(Handler.java:95) 
        at android.os.Looper.loop(Looper.java:136) 
        at android.app.ActivityThread.main(ActivityThread.java:5017) 
        at java.lang.reflect.Method.invokeNative(Native Method) 
        at java.lang.reflect.Method.invoke(Method.java:515) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
        at dalvik.system.NativeStart.main(Native Method) 
       Caused by: java.lang.reflect.InvocationTargetException 
        at java.lang.reflect.Method.invokeNative(Native Method) 
        at java.lang.reflect.Method.invoke(Method.java:515) 
        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288) 
        at android.view.View.performClick(View.java:4438)  
        at android.view.View$PerformClick.run(View.java:18422)  
        at android.os.Handler.handleCallback(Handler.java:733)  
        at android.os.Handler.dispatchMessage(Handler.java:95)  
        at android.os.Looper.loop(Looper.java:136)  
        at android.app.ActivityThread.main(ActivityThread.java:5017)  
        at java.lang.reflect.Method.invokeNative(Native Method)  
        at java.lang.reflect.Method.invoke(Method.java:515)  
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)  
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)  
        at dalvik.system.NativeStart.main(Native Method)  
       Caused by: java.lang.NullPointerException 
        at com.wind.wind.sign_in.onClicksignin(sign_in.java:57) 
        at java.lang.reflect.Method.invokeNative(Native Method)  
        at java.lang.reflect.Method.invoke(Method.java:515)  
        at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)  
        at android.view.View.performClick(View.java:4438)  
        at android.view.View$PerformClick.run(View.java:18422)  
        at android.os.Handler.handleCallback(Handler.java:733)  
        at android.os.Handler.dispatchMessage(Handler.java:95)  
        at android.os.Looper.loop(Looper.java:136)  
        at android.app.ActivityThread.main(ActivityThread.java:5017)  
        at java.lang.reflect.Method.invokeNative(Native Method)  
        at java.lang.reflect.Method.invoke(Method.java:515)  
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)  
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)  
        at dalvik.system.NativeStart.main(Native Method)

我的代码：

package com.wind.wind; 

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.EditText; 
import android.widget.TextView; 

import com.wind.wind.data_user.User; 
import com.wind.wind.remote.windAPI; 

import retrofit2.Call; 
import retrofit2.Callback; 
import retrofit2.Response; 
import retrofit2.Retrofit; 
import retrofit2.converter.gson.GsonConverterFactory; 

public class sign_in extends AppCompatActivity { 

//EditText fields 
EditText login_; 
EditText password_; 

//String containers 
private String login; 
private String password; 
private windchatAPI api; 

@Override 
protected void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_sign_in); 
    login_ = (EditText) findViewById(R.id.editText); 
    password_ = (EditText) findViewById(R.id.editText2); 
} 

public void onClicksignin(View v) 
{ 
    login = login_.getText().toString(); 
    password = password_.getText().toString(); 
    windchatAPI.Factory.getInstance().getUser().enqueue(new Callback<User>() { 
     @Override 
     public void onResponse(Call<User> call, Response<User> response) 
     { 
      Log.e("login success", response.body().getToken()); 
     } 

     @Override 
     public void onFailure(Call<User> call, Throwable t) { 
      Log.e("login failed", t.getMessage()); 
     } 
    }); 
}

我认为问题是，windchatAPI是没有申报，但我不知道该怎么做。有人可以帮我吗？

windAPI是我保持信息接口：

public interface windAPI 
{ 
    @GET("user/register") 
    Call<User> getUser(); 
    String URL = "my_url"; 

    class Factory 
    { 
    private static windAPI service; 
    public static windAPI getInstance() 
    { 
     if (service == NULL) 
     { 
      //creating the base URL from winchat api 
      Retrofit retrofit = new Retrofit.Builder().addConverterFactory(GsonConverterFactory.create()).baseUrl(URL).build(); 
      service = retrofit.create(windAPI.class); 
      return service; 
     } 
     else 
      return service; 
    } 
    } 
}

XML文件：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/activity_sign_in" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:paddingBottom="@dimen/activity_vertical_margin" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
tools:context="com.wind.wind.sign_in" 
android:background="#fffc00"> 

<TextView 
    android:text="Login" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentTop="true" 
    android:layout_alignParentStart="true" 
    android:layout_marginStart="15dp" 
    android:layout_marginTop="36dp" 
    android:id="@+id/textView" 
    android:textSize="18sp" /> 

<EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:inputType="textPersonName" 
    android:ems="10" 
    android:layout_below="@+id/textView" 
    android:layout_alignStart="@+id/textView" 
    android:layout_marginTop="19dp" 
    android:id="@+id/editText" 
    android:hint="Enter your login" 
    style="@style/Widget.AppCompat.EditText" /> 

<EditText 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:inputType="textPassword" 
    android:ems="10" 
    android:layout_marginTop="19dp" 
    android:id="@+id/editText2" 
    android:layout_below="@+id/textView2" 
    android:layout_alignStart="@+id/textView2" 
    style="@style/Widget.AppCompat.EditText" 
    android:hint="Enter your password" /> 

<TextView 
    android:text="Password" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginTop="22dp" 
    android:id="@+id/textView2" 
    android:layout_below="@+id/editText" 
    android:layout_alignStart="@+id/editText" 
    android:textSize="18sp" /> 

<Button 
    android:text="Log in" 
    android:layout_height="wrap_content" 
    android:layout_marginTop="100dp" 
    android:id="@+id/button4" 
    android:background="@android:color/holo_blue_dark" 
    android:layout_below="@+id/editText2" 
    android:layout_centerHorizontal="true" 
    android:layout_width="200dp" 
    android:textColor="@android:color/background_light" 
    android:onClick="onClicksignin" />

当我在java代码行windAPI.Factory删除...它的工作原理...

编辑：清单添加

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
package="com.wind.wind"> 

<uses-permission android:name="android.permission.CAMERA" /> 

<uses-feature android:name="android.hardware.camera" /> 

<!-- To auto-complete the email text field in the login form with the user's emails --> 
<uses-permission android:name="android.permission.GET_ACCOUNTS" /> 
<uses-permission android:name="android.permission.READ_PROFILE" /> 
<uses-permission android:name="android.permission.READ_CONTACTS" /> 

<!-- Used for retrofit api --> 
<uses-permission android:name="android.permission.INTERNET" /> 

<application 
    android:allowBackup="true" 
    android:icon="@mipmap/ic_launcher" 
    android:label="@string/app_name" 
    android:supportsRtl="true" 
    android:theme="@style/AppTheme"> 
    <activity android:name=".Login_page"> 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
    <activity android:name=".wind_sent" /> 
    <activity android:name=".MainActivity" /> 
    <activity android:name=".sign_in" /> 
    <activity android:name=".register_activity"></activity> 
</application>

来源

2016-12-08 Baptiste SA

你在哪里该链接的onClick方法的按钮？在XML？用奶油刀？我们可以看到xml – Jaythaking

sign_in.java:57上的内容吗？ –

这通常是因为findViewById（）无法从xml文件中识别出正确的资源。请粘贴您的xml并完成您的java活动文件的代码。 – nitinsh99

请检查两两件事：

你有没有宣布在清单中的活动？我可以看到你有一个

Caused by: java.lang.NullPointerException at com.wind.wind.sign_in.onClicksignin(sign_in.java:57)

是您的RelativeLayout在XML文件关闭？

来源

2016-12-08 19:41:19 Stefan

在代码中关闭了相关布局，当我在这里复制时，我忘了它。活动sign_in被添加到清单中，但不是界面 –

在sign_in类做到这一点

public class sign_in extends AppCompatActivity implement OnClickListener { 

//EditText fields 
EditText login_; 
EditText password_; 

//String containers 
private String login; 
private String password; 
private windchatAPI api; 

@Override 
protected void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_sign_in); 
    login_ = (EditText) findViewById(R.id.editText); 
    password_ = (EditText) findViewById(R.id.editText2); 
    findViewById(R.id.button4).setOnClickListener(this) 
} 

@Override 
public void onClick(View v) 
{ 
    login = login_.getText().toString(); 
    password = password_.getText().toString(); 
    windchatAPI.Factory.getInstance().getUser().enqueue(new Callback<User>() { 
     @Override 
     public void onResponse(Call<User> call, Response<User> response) 
     { 
      Log.e("login success", response.body().getToken()); 
     } 

     @Override 
     public void onFailure(Call<User> call, Throwable t) { 
      Log.e("login failed", t.getMessage()); 
     } 
    }); 
}

和删除的onClick从XML

来源

2016-12-08 20:02:16

无法执行android的方法：onClick - 翻新

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