ОШИБКА java.lang.RuntimeException: Невозможно запустить Активность в

Question

я failured в моем коде, пожалуйста, как решить эти проблемы

04-29 00:11:35.321 1849-1849/com.example.jerino.tesbaju E/AndroidRuntime﹕ FATAL EXCEPTION: main 
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.jerino.tesbaju/com.example.jerino.tesbaju.MainActivity}: java.lang.NullPointerException 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 
      at android.app.ActivityThread.access$600(ActivityThread.java:123) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 
      at android.os.Handler.dispatchMessage(Handler.java:99) 
      at android.os.Looper.loop(Looper.java:137) 
      at android.app.ActivityThread.main(ActivityThread.java:4424) 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:511) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
      at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.NullPointerException 
      at com.example.jerino.tesbaju.MainActivity.onCreate(MainActivity.java:44) 
      at android.app.Activity.performCreate(Activity.java:4465) 
      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 
            at android.app.ActivityThread.access$600(ActivityThread.java:123) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 
            at android.os.Handler.dispatchMessage(Handler.java:99) 
            at android.os.Looper.loop(Looper.java:137) 
            at android.app.ActivityThread.main(ActivityThread.java:4424) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:511) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
            at dalvik.system.NativeStart.main(Native Method) 
04-29 00:11:35.782 1849-1855/com.example.jerino.tesbaju I/dalvikvm﹕ threadid=3: reacting to signal 3 
04-29 00:11:35.782 1849-1855/com.example.jerino.tesbaju I/dalvikvm﹕ Wrote stack traces to '/data/anr/traces.txt' 
04-29 00:11:35.841 1849-1855/com.example.jerino.tesbaju I/dalvikvm﹕ threadid=3: reacting to signal 3 
04-29 00:11:35.841 1849-1855/com.example.jerino.tesbaju I/dalvikvm﹕ Wrote stack traces to '/data/anr/traces.txt' 

это мой MainActivity.java

package com.example.jerino.tesbaju; 

import android.support.v7.app.ActionBarActivity; 
import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Toast; 

import org.apache.http.NameValuePair; 
import org.apache.http.message.BasicNameValuePair; 
import org.json.JSONException; 
import org.json.JSONObject; 

import java.util.ArrayList; 
import java.util.List; 


public class MainActivity extends Activity { 
    EditText model,style,size,color,price; 
    Button register; 
    String modeltxt,styletxt,sizetxt,colortxt,pricetxt; 
    List<NameValuePair> params; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     model = (EditText)findViewById(R.id.model); 
     style = (EditText)findViewById(R.id.style); 
     size = (EditText)findViewById(R.id.size); 
     color = (EditText)findViewById(R.id.color); 
     price = (EditText)findViewById(R.id.price); 




     register.setOnClickListener(new View.OnClickListener() { 

      @Override 
      public void onClick(View view) { 
       modeltxt = model.getText().toString(); 
       styletxt = style.getText().toString(); 
       sizetxt = size.getText().toString(); 
       colortxt = color.getText().toString(); 
       pricetxt = price.getText().toString(); 
       params = new ArrayList<NameValuePair>(); 
       params.add(new BasicNameValuePair("model",modeltxt)); 
       params.add(new BasicNameValuePair("style",styletxt)); 
       params.add(new BasicNameValuePair("size",sizetxt)); 
       params.add(new BasicNameValuePair("color",colortxt)); 
       params.add(new BasicNameValuePair("price",pricetxt)); 
       ServerRequest sr = new ServerRequest(); 
       JSONObject json = sr.getJSON("http://10.0.2.2:3000/tshirts",params); 
       //JSONObject json = sr.getJSON("http://192.168.56.1:8080/register",params); 

       if(json != null){ 
        try{ 
         String jsonstr = json.getString("response"); 

         Toast.makeText(getApplication(),jsonstr,Toast.LENGTH_LONG).show(); 

         Log.d("Hello", jsonstr); 
        }catch (JSONException e) { 
         e.printStackTrace(); 
        } 
       } 
      } 
     }); 
    } 




} 

Это activity_main .xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" 

    tools:context=".MainActivity" > 


    <EditText 
     android:layout_width="440px" 
     android:layout_height="80px" 
     android:layout_gravity="center" 
     android:id="@+id/model" 
     android:layout_marginTop="30px" 
     android:hint="example@mail.com"/> 

    <EditText 
     android:id="@+id/style" 
     android:layout_gravity="center" 
     android:layout_width="440px" 
     android:layout_height="80px" 
     android:inputType="textPassword" 
     android:hint="******"/> 
    <EditText 
     android:id="@+id/size" 
     android:layout_gravity="center" 
     android:layout_width="440px" 
     android:layout_height="80px" 
     android:inputType="textPassword" 
     android:hint="******"/> 
    <EditText 
     android:id="@+id/color" 
     android:layout_gravity="center" 
     android:layout_width="440px" 
     android:layout_height="80px" 
     android:inputType="textPassword" 
     android:hint="******"/> 
    <EditText 
     android:id="@+id/price" 
     android:layout_gravity="center" 
     android:layout_width="440px" 
     android:layout_height="80px" 
     android:inputType="textPassword" 
     android:hint="******"/> 

    <Button 
     android:layout_width="440px" 
     android:layout_height="80px" 
     android:id="@+id/registerbtn" 
     android:layout_gravity="center" 

     android:textColor="#ffffff" 
     android:textAlignment="center" 
     android:text="Register"/> 




</LinearLayout> 

это мой ServerRequest.java для JSON

package com.example.jerino.tesbaju; 

/** 
* Created by jerino on 28/04/15. 
*/ 
import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.UnsupportedEncodingException; 
import java.util.List; 
import java.util.concurrent.ExecutionException; 

import org.apache.http.HttpEntity; 
import org.apache.http.HttpResponse; 
import org.apache.http.NameValuePair; 
import org.apache.http.client.ClientProtocolException; 
import org.apache.http.client.entity.UrlEncodedFormEntity; 
import org.apache.http.client.methods.HttpPost; 
import org.apache.http.impl.client.DefaultHttpClient; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.os.AsyncTask; 
import android.util.Log; 

public class ServerRequest { 

    static InputStream is = null; 
    static JSONObject jObj = null; 
    static String json = ""; 


    public ServerRequest() { 

    } 

    public JSONObject getJSONFromUrl(String url, List<NameValuePair> params) { 


     try { 

      DefaultHttpClient httpClient = new DefaultHttpClient(); 
      HttpPost httpPost = new HttpPost(url); 
      httpPost.setEntity(new UrlEncodedFormEntity(params)); 

      HttpResponse httpResponse = httpClient.execute(httpPost); 
      HttpEntity httpEntity = httpResponse.getEntity(); 
      is = httpEntity.getContent(); 

     } catch (UnsupportedEncodingException e) { 
      e.printStackTrace(); 
     } catch (ClientProtocolException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 

     try { 
      BufferedReader reader = new BufferedReader(new InputStreamReader(
        is, "iso-8859-1"), 8); 
      StringBuilder sb = new StringBuilder(); 
      String line = null; 
      while ((line = reader.readLine()) != null) { 
       sb.append(line + "\n"); 
      } 
      is.close(); 
      json = sb.toString(); 
      Log.e("JSON", json); 
     } catch (Exception e) { 
      Log.e("Buffer Error", "Error converting result " + e.toString()); 
     } 


     try { 
      jObj = new JSONObject(json); 
     } catch (JSONException e) { 
      Log.e("JSON Parser", "Error parsing data " + e.toString()); 
     } 


     return jObj; 

    } 
    JSONObject jobj; 
    public JSONObject getJSON(String url, List<NameValuePair> params) { 

     Params param = new Params(url,params); 
     Request myTask = new Request(); 
     try{ 
      jobj= myTask.execute(param).get(); 
     }catch (InterruptedException e) { 
      e.printStackTrace(); 
     }catch (ExecutionException e){ 
      e.printStackTrace(); 
     } 
     return jobj; 
    } 


    private static class Params { 
     String url; 
     List<NameValuePair> params; 


     Params(String url, List<NameValuePair> params) { 
      this.url = url; 
      this.params = params; 

     } 
    } 

    private class Request extends AsyncTask<Params, String, JSONObject> { 

     @Override 
     protected JSONObject doInBackground(Params... args) { 

      ServerRequest request = new ServerRequest(); 
      JSONObject json = request.getJSONFromUrl(args[0].url,args[0].params); 

      return json; 
     } 

     @Override 
     protected void onPostExecute(JSONObject json) { 

      super.onPostExecute(json); 

     } 

    } 
} 

и последний это мой манифест

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

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

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
     <activity 
      android:name=".Register" 
      android:label="@string/title_activity_register" > 
     </activity> 
    </application> 
    <uses-permission android:name="android.permission.INTERNET" /> 
</manifest> 

что я могу сделать? спасибо сэр

Answer 1

Вы забыли связать регистр кнопки, используйте:

register = (Button) findViewById(<id>); 

Answer 2

до этого

register.setOnClickListener(new View.OnClickListener() { 

вы должны добавить

register=(Button)findViewById(R.id.YourRegisterButton); 

Answer 3

Линия 44:

register.setOnClickListener(new View.OnClickListener() { 

Переменный регистр никогда не является интинализированным, поэтому у вас есть исключение NullPointerException.

Добавить:

register = (Button)findViewById(R.id.registerbtn); 

Answer 4

Вы должны инициализировать регистр Button перед использованием:

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    model = (EditText)findViewById(R.id.model); 

    .... 
    .... 

    register = (Button) findViewById(R.id.registerbtn); 

    register.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View view) { 
      ...... 
      ...... 
     } 
    }); 
}