CODEWITHSUNDEEP
androidandroid-emulatorandroid-logcat
Loganayaki Palanisamy
Loganayaki Palanisamy

Reputation: 417

emulator shows unfortunately, myapp has stopped

when i run my application emulator simply says "unfortunately,myapp has stopped". the logcat throws error. my logcat error

04-21 15:24:13.661: I/Process(25846): Sending signal. PID: 25846 SIG: 9
04-21 15:24:34.572: D/AndroidRuntime(25911): Shutting down VM
04-21 15:24:34.572: W/dalvikvm(25911): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-21 15:24:34.592: E/AndroidRuntime(25911): FATAL EXCEPTION: main
04-21 15:24:34.592: E/AndroidRuntime(25911): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.loga/com.example.loga.MainActivity}: java.lang.NullPointerException
04-21 15:24:34.592: E/AndroidRuntime(25911):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
04-21 15:24:34.592: E/AndroidRuntime(25911):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-21 15:24:34.592: E/AndroidRuntime(25911):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-21 15:24:34.592: E/AndroidRuntime(25911):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-21 15:24:34.592: E/AndroidRuntime(25911):    at android.os.Handler.dispatchMessage(Handler.java:99)
04-21 15:24:34.592: E/AndroidRuntime(25911):    at android.os.Looper.loop(Looper.java:137)
04-21 15:24:34.592: E/AndroidRuntime(25911):    at android.app.ActivityThread.main(ActivityThread.java:5041)
04-21 15:24:34.592: E/AndroidRuntime(25911):    at java.lang.reflect.Method.invokeNative(Native Method)
04-21 15:24:34.592: E/AndroidRuntime(25911):    at java.lang.reflect.Method.invoke(Method.java:511)
04-21 15:24:34.592: E/AndroidRuntime(25911):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-21 15:24:34.592: E/AndroidRuntime(25911):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-21 15:24:34.592: E/AndroidRuntime(25911):    at dalvik.system.NativeStart.main(Native Method)
04-21 15:24:34.592: E/AndroidRuntime(25911): Caused by: java.lang.NullPointerException
04-21 15:24:34.592: E/AndroidRuntime(25911):    at com.example.loga.MainActivity.onCreate(MainActivity.java:22)
04-21 15:24:34.592: E/AndroidRuntime(25911):    at android.app.Activity.performCreate(Activity.java:5104)
04-21 15:24:34.592: E/AndroidRuntime(25911):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
04-21 15:24:34.592: E/AndroidRuntime(25911):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
04-21 15:24:34.592: E/AndroidRuntime(25911):    ... 11 more
04-21 15:24:37.425: I/Process(25911): Sending signal. PID: 25911 SIG: 9
04-21 15:24:42.581: D/AndroidRuntime(25927): Shutting down VM
04-21 15:24:42.581: W/dalvikvm(25927): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-21 15:24:42.602: E/AndroidRuntime(25927): FATAL EXCEPTION: main
04-21 15:24:42.602: E/AndroidRuntime(25927): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.loga/com.example.loga.MainActivity}: java.lang.NullPointerException
04-21 15:24:42.602: E/AndroidRuntime(25927):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
04-21 15:24:42.602: E/AndroidRuntime(25927):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-21 15:24:42.602: E/AndroidRuntime(25927):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-21 15:24:42.602: E/AndroidRuntime(25927):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-21 15:24:42.602: E/AndroidRuntime(25927):    at android.os.Handler.dispatchMessage(Handler.java:99)
04-21 15:24:42.602: E/AndroidRuntime(25927):    at android.os.Looper.loop(Looper.java:137)
04-21 15:24:42.602: E/AndroidRuntime(25927):    at android.app.ActivityThread.main(ActivityThread.java:5041)
04-21 15:24:42.602: E/AndroidRuntime(25927):    at java.lang.reflect.Method.invokeNative(Native Method)
04-21 15:24:42.602: E/AndroidRuntime(25927):    at java.lang.reflect.Method.invoke(Method.java:511)
04-21 15:24:42.602: E/AndroidRuntime(25927):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-21 15:24:42.602: E/AndroidRuntime(25927):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-21 15:24:42.602: E/AndroidRuntime(25927):    at dalvik.system.NativeStart.main(Native Method)
04-21 15:24:42.602: E/AndroidRuntime(25927): Caused by: java.lang.NullPointerException
04-21 15:24:42.602: E/AndroidRuntime(25927):    at com.example.loga.MainActivity.onCreate(MainActivity.java:22)
04-21 15:24:42.602: E/AndroidRuntime(25927):    at android.app.Activity.performCreate(Activity.java:5104)
04-21 15:24:42.602: E/AndroidRuntime(25927):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
04-21 15:24:42.602: E/AndroidRuntime(25927):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
04-21 15:24:42.602: E/AndroidRuntime(25927):    ... 11 more
04-21 15:24:46.051: I/Process(25927): Sending signal. PID: 25927 SIG: 9
04-21 15:28:28.302: E/Trace(26031): error opening trace file: No such file or directory (2)
04-21 15:28:29.192: D/AndroidRuntime(26031): Shutting down VM
04-21 15:28:29.192: W/dalvikvm(26031): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-21 15:28:29.202: E/AndroidRuntime(26031): FATAL EXCEPTION: main
04-21 15:28:29.202: E/AndroidRuntime(26031): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.loga/com.example.loga.MainActivity}: java.lang.NullPointerException
04-21 15:28:29.202: E/AndroidRuntime(26031):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
04-21 15:28:29.202: E/AndroidRuntime(26031):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-21 15:28:29.202: E/AndroidRuntime(26031):    at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-21 15:28:29.202: E/AndroidRuntime(26031):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-21 15:28:29.202: E/AndroidRuntime(26031):    at android.os.Handler.dispatchMessage(Handler.java:99)
04-21 15:28:29.202: E/AndroidRuntime(26031):    at android.os.Looper.loop(Looper.java:137)
04-21 15:28:29.202: E/AndroidRuntime(26031):    at android.app.ActivityThread.main(ActivityThread.java:5041)
04-21 15:28:29.202: E/AndroidRuntime(26031):    at java.lang.reflect.Method.invokeNative(Native Method)
04-21 15:28:29.202: E/AndroidRuntime(26031):    at java.lang.reflect.Method.invoke(Method.java:511)
04-21 15:28:29.202: E/AndroidRuntime(26031):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-21 15:28:29.202: E/AndroidRuntime(26031):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-21 15:28:29.202: E/AndroidRuntime(26031):    at dalvik.system.NativeStart.main(Native Method)
04-21 15:28:29.202: E/AndroidRuntime(26031): Caused by: java.lang.NullPointerException
04-21 15:28:29.202: E/AndroidRuntime(26031):    at com.example.loga.MainActivity.onCreate(MainActivity.java:22)
04-21 15:28:29.202: E/AndroidRuntime(26031):    at android.app.Activity.performCreate(Activity.java:5104)
04-21 15:28:29.202: E/AndroidRuntime(26031):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
04-21 15:28:29.202: E/AndroidRuntime(26031):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
04-21 15:28:29.202: E/AndroidRuntime(26031):    ... 11 more

i dont know where actually it went wrong but no error in coding. my .java file is

package com.example.loga;

import android.os.Bundle;

import android.app.Activity;
import android.app.AlertDialog;

import android.view.Menu;
import android.widget.Button;



import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONObject;



import android.app.ProgressDialog;


import android.os.AsyncTask;
import android.util.Log;
import android.view.View;
import android.widget.EditText;


public class Login extends Activity {

     private ProgressDialog pDialog;

     JSONParser jsonParser = new JSONParser();
        EditText inputpw;


        private static String url_logincheck = "http://10.0.2.2/android_connect/logincheck.php";
        // JSON Node names
        private static final String TAG_SUCCESS = "success";





    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
         // Edit Text
        inputpw = (EditText) findViewById(R.id.editText1);

        Button button1 = (Button) findViewById(R.id.button1);
        button1.setOnClickListener(new View.OnClickListener()
        {
            public void onClick(View view) {
                // creating new product in background thread
                new check().execute();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.login, menu);
        return true;
    }
    class check extends AsyncTask<String, String,String> {

        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(Login.this);
            pDialog.setMessage("Validating....");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        /**
         * Creating product
         * */
        protected String doInBackground(String... args) {
            String pw = inputpw.getText().toString();


            // Building Parameters
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair("pw",pw));



            // getting JSON Object
            // Note that create product url accepts POST method
            JSONObject json = jsonParser.makeHttpRequest(url_logincheck,
                    "POST", params);
            // check log cat for response
            Log.d("Create Response", json.toString());

            // check for success tag
            try {
                int success = json.getInt(TAG_SUCCESS);

                if (success == 1) {
                    AlertDialog alertDialog;
                    alertDialog = new AlertDialog.Builder(Login.this).create();
                    alertDialog.setTitle("password verification..");
                    alertDialog.setMessage("success.!!");
                    alertDialog.show();
                    finish();
                } else {
                    // failed to create product
                }
             }
            catch (Exception e) {
                e.printStackTrace();
            }



            return null;

        }

        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(String file_url) {
            // dismiss the dialog once done
            pDialog.dismiss();
        }

    }

}

my activity_login.xml

<RelativeLayout 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: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=".Login" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="31dp"
        android:text="@string/password"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="136dp"
        android:text="@string/click" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="36dp"
        android:ems="10"
        android:inputType="textPassword" />

</RelativeLayout>

my MainActivity.java file is:

package com.example.loga;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.content.Context;
import android.content.Intent;
public class MainActivity extends Activity implements View.OnClickListener {
    Button button1,button2,button3,button4;
    final Context context = this;
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         button1 = (Button) findViewById(R.id.button1);
         button2 = (Button) findViewById(R.id.button2);
         button3=  (Button) findViewById(R.id.button3);
         button4=  (Button) findViewById(R.id.button4);
         button1.setOnClickListener((OnClickListener) this);
         button2.setOnClickListener((OnClickListener) this);
         button3.setOnClickListener((OnClickListener) this);
         button4.setOnClickListener((OnClickListener) this);

    }

    public void onClick(View v) {
           switch(v.getId()) {
               case R.id.button1:
               // do stuff
                // TODO Auto-generated method stub


                button1 = (Button) findViewById(R.id.button1);

                button1.setOnClickListener(new OnClickListener() {

                    @Override
                    public void onClick(View view) {

                        Intent intent = new Intent(context, MainActivity1.class);
                                       startActivity(intent);   
                    }
                });
               break;
               case R.id.button2:
               // do stuff
                // TODO Auto-generated method stub


                button2= (Button) findViewById(R.id.button2);

                button2.setOnClickListener(new OnClickListener() {

                    @Override
                    public void onClick(View view) {

                        Intent intent = new Intent(context, Login.class);
                                       startActivity(intent);   
                    }
                });
               break;
               case R.id.button3:
                   button3= (Button) findViewById(R.id.button3);

                    button3.setOnClickListener(new OnClickListener() {

                        @Override
                        public void onClick(View view) {

                            Intent intent = new Intent(context, Recovery.class);
                                           startActivity(intent);   
                        }
                    });
                   break;

               case R.id.button4:

                    button4= (Button) findViewById(R.id.button4);

                    button4.setOnClickListener(new OnClickListener() {

                        @Override
                        public void onClick(View view) {
                          finish();
                           System.exit(0);


                        }
                    });
                 }  
       }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

what is wrong with the coding? help me.thanks:)

Upvotes: 0

Views: 2080

Answers (2)

Shiv
Shiv

Reputation: 4567

Check if you are setting correct layout

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);  //<<------ HERE

because i can see that in your onCreateOptionsMenu and in onCreate you are setting two different named layouts if its by mistake...

So set layout on onCreate which has the button id button1

EDIT

In your MainActivity change to this if it helps

  @Override
public void onClick(View v) {
           switch(v.getId()) {
               case R.id.button1:
              {

                        Intent intent = new Intent(context, MainActivity1.class);
                                       startActivity(intent);   
                    
            }
               break;
               case R.id.button2:
               {

                        Intent intent = new Intent(context, Login.class);
                                       startActivity(intent);   
                    }
               
               break;
               case R.id.button3:
                   {

                            Intent intent = new Intent(context, Recovery.class);
                                           startActivity(intent);   
                        }
                    
                   break;

               case R.id.button4:

                   {

                       
                          finish();
                           System.exit(0);


                        }
                   
                 }

Upvotes: 2

Budius
Budius

Reputation: 39836

It seems to me that you have a problem on your Layout there's no element named R.id.button1 on R.layout.activity_login so when you call button1.setOnClickListener you get the NulPointerException .

Upvotes: 0

Related Questions