FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity ComponentInfo

Question

Ive only been programming a few days, so I am struggling to grasp what I am doing wrong here, hoping the community can point me in the right direction.. Here my MainActivity:

package com.whatsonwhere.app;

import android.app.Activity;
import android.app.Dialog;
import android.content.Intent;
import android.content.IntentSender;
import android.location.Location;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesClient;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.location.LocationClient;
import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;


public class MainActivity extends ActionBarActivity implements
        GooglePlayServicesClient.ConnectionCallbacks,
        GooglePlayServicesClient.OnConnectionFailedListener{
    private SupportMapFragment mapFragment;
    private GoogleMap map;
    private LocationClient mLocationClient;
    /*
     * Define a request code to send to Google Play services
     * This code is returned in Activity.onActivityResult
     */
    private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;

    // Define a DialogFragment that displays the error dialog
    public static class ErrorDialogFragment extends DialogFragment {

        // Global field to contain the error dialog
        private Dialog mDialog;

        // Default constructor. Sets the dialog field to null
        public ErrorDialogFragment() {
            super();
            mDialog = null;
        }

        // Set the dialog to display
        public void setDialog(Dialog dialog) {
            mDialog = dialog;
        }

        // Return a Dialog to the DialogFragment.
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            return mDialog;
        }
    }

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

        mLocationClient = new LocationClient(this, this, this);

        mapFragment = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.mapView));
        map = mapFragment.getMap();

        map.setMyLocationEnabled(true);

    }

    /*
     * Called when the Activity becomes visible.
     */
    @Override
    protected void onStart() {
        super.onStart();
        // Connect the client.
        if(isGooglePlayServicesAvailable()){
            mLocationClient.connect();
        }

    }

    /*
     * Called when the Activity is no longer visible.
     */
    @Override
    protected void onStop() {
        // Disconnecting the client invalidates it.
        mLocationClient.disconnect();
        super.onStop();
    }

    /*
     * Handle results returned to the FragmentActivity
     * by Google Play services
     */
    @Override
    protected void onActivityResult(
            int requestCode, int resultCode, Intent data) {
        // Decide what to do based on the original request code
        switch (requestCode) {

            case CONNECTION_FAILURE_RESOLUTION_REQUEST:
            /*
             * If the result code is Activity.RESULT_OK, try
             * to connect again
             */
                switch (resultCode) {
                    case Activity.RESULT_OK:
                        mLocationClient.connect();
                        break;
                }

        }
    }

    private boolean isGooglePlayServicesAvailable() {
        // Check that Google Play services is available
        int resultCode =  GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
        // If Google Play services is available
        if (ConnectionResult.SUCCESS == resultCode) {
            // In debug mode, log the status
            Log.d("Location Updates", "Google Play services is available.");
            return true;
        } else {
            // Get the error dialog from Google Play services
            Dialog errorDialog = GooglePlayServicesUtil.getErrorDialog( resultCode,
                    this,
                    CONNECTION_FAILURE_RESOLUTION_REQUEST);

            // If Google Play services can provide an error dialog
            if (errorDialog != null) {
                // Create a new DialogFragment for the error dialog
                ErrorDialogFragment errorFragment = new ErrorDialogFragment();
                errorFragment.setDialog(errorDialog);
                errorFragment.show(getSupportFragmentManager(), "Location Updates");
            }

            return false;
        }
    }

    /*
     * Called by Location Services when the request to connect the
     * client finishes successfully. At this point, you can
     * request the current location or start periodic updates
     */
    @Override
    public void onConnected(Bundle dataBundle) {
        // Display the connection status
        Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show();
        Location location = mLocationClient.getLastLocation();
        LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
        CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, 17);
        map.animateCamera(cameraUpdate);
    }

    /*
     * Called by Location Services if the connection to the
     * location client drops because of an error.
     */
    @Override
    public void onDisconnected() {
        // Display the connection status
        Toast.makeText(this, "Disconnected. Please re-connect.",
                Toast.LENGTH_SHORT).show();
    }

    /*
     * Called by Location Services if the attempt to
     * Location Services fails.
     */
    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
    /*
     * Google Play services can resolve some errors it detects.
     * If the error has a resolution, try sending an Intent to
     * start a Google Play services activity that can resolve
     * error.
     */
        if (connectionResult.hasResolution()) {
            try {
                // Start an Activity that tries to resolve the error
                connectionResult.startResolutionForResult(
                        this,
                        CONNECTION_FAILURE_RESOLUTION_REQUEST);
            /*
            * Thrown if Google Play services canceled the original
            * PendingIntent
            */
            } catch (IntentSender.SendIntentException e) {
                // Log the error
                e.printStackTrace();
            }
        } else {
            Toast.makeText(getApplicationContext(), "Sorry. Location services not available to you", Toast.LENGTH_LONG).show();
        }
    }




    @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;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }



}

and my manifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.whatsonwhere.app" >
    <permission
        android:name="com.whatsonwhere.app.MAPS_RECEIVE"
        android:protectionLevel="signature"/>
    <uses-permission android:name="com.whatsonwhere.app.MAPS_RECEIVE"/>

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true"/>
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.whatsonwhere.app.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>


        <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />
        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="mykey_here(removed)" />
    </application>

</manifest>

Activity_main:

<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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="com.whatsonwhere.app.MainActivity">

    <fragment xmlns:android="http://schemas.android.com/apk/res/android"

        android:id="@+id/mapView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:name="com.google.android.gms.maps.MapFragment"
        android:layout_below="@+id/textView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_above="@+id/button" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="@string/TopText"
        android:id="@+id/textView2"
        />

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/nearme"
        android:id="@+id/button"
        android:layout_centerVertical="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/search"
        android:id="@+id/button2"
        android:layout_below="@+id/button"
        android:layout_centerHorizontal="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="@string/loc"
        android:id="@+id/textView"
        android:layout_below="@+id/textView2"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

</RelativeLayout>

And finally the logcat:

03-25 11:28:19.417    6650-6650/com.whatsonwhere.app D/AndroidRuntime﹕ Shutting down VM
03-25 11:28:19.417    6650-6650/com.whatsonwhere.app W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x415e88b0)
03-25 11:28:19.417    6650-6650/com.whatsonwhere.app E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.whatsonwhere.app/com.whatsonwhere.app.MainActivity}: java.lang.NullPointerException
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2266)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2316)
            at android.app.ActivityThread.access$600(ActivityThread.java:150)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1298)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:213)
            at android.app.ActivityThread.main(ActivityThread.java:5225)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.NullPointerException
            at com.whatsonwhere.app.MainActivity.onCreate(MainActivity.java:71)
            at android.app.Activity.performCreate(Activity.java:5133)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2230)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2316)
            at android.app.ActivityThread.access$600(ActivityThread.java:150)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1298)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:213)
            at android.app.ActivityThread.main(ActivityThread.java:5225)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:525)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
            at dalvik.system.NativeStart.main(Native Method)
03-25 11:28:19.537    6650-6682/com.whatsonwhere.app W/ActivityThread﹕ ClassLoader.loadClass: The class loader returned by Thread.getContextClassLoader() may fail for processes that host multiple applications. You should explicitly specify a context class loader. For example: Thread.setContextClassLoader(getClass().getClassLoader());
03-25 11:28:21.477    6650-6650/com.whatsonwhere.app I/Process﹕ Sending signal. PID: 6650 SIG: 9

What is line 71 MainActivity.java?

Raghunandan
– Raghunandan

2014-03-25 11:39:33 +00:00
Commented Mar 25, 2014 at 11:39 — Raghunandan
– Raghunandan, Commented Mar 25, 2014 at 11:39

Pararth · Accepted Answer · 2014-03-25 11:55:44Z

1

When you specify:

setContentView(R.layout.activity_main);

And

mapFragment =((SupportMapFragment)getSupportFragmentManager().findFragmentById(R.id.mapView));   
map = mapFragment.getMap();

The compiler looks for R.id.mapView in R.layout.activity_main .The names are case sensitive.
The line:

map=mapFragment.getMap():

throws a NPE as the mapView isn't found in its respective layout. Check the names if id(s) and whether it is declared in the mentioned layout.

Also, alternatively..you can use:

map = ((SupportMapFragment) this.getSupportFragmentManager()
                    .findFragmentById(R.id.mapView)).getMap();

saves a variable declaration and l-o-c, if not necessary otherwise.

Add fragment like this:

 <fragment
            android:id="@+id/mapView"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/textView"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_above="@+id/button"
            class="com.google.android.gms.maps.SupportMapFragment" />

edited Mar 25, 2014 at 11:55

answered Mar 25, 2014 at 11:44

Pararth

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3 Comments

Jimmyeao Over a year ago

Not sure Im understing here - Ill add my activity main into the top post

Raghunandan Over a year ago

@Jimmyeao you have android:name="com.google.android.gms.maps.MapFragment" but when you initialize you have mapFragment = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.mapView));. Its should be SupportMapFragment. The map object can be null

Raghunandan Over a year ago

@Jimmyeao what's your min sdk ? coz if you want to support below 11 then you need to use SupportMapFragment

Atish Agrawal · Accepted Answer · 2014-03-25 11:42:46Z

0

Sometimes, when the activity is created, the map is not initialised. This leads to NullPointerException.

You must move the code mapFragment etc from onCreate to onResume.

This will ensure that the activity is created and in foreground.

answered Mar 25, 2014 at 11:42

Atish Agrawal

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Comments

nikis · Accepted Answer · 2014-03-25 11:48:36Z

0

mapFragment is null after the findFragmentById() call. Please make sure you have id = mapView (case-sensitive) inside activity_main.xml. If you have it there, you can also try to move the work with MapFragment from onCreate to onStart or onResume

edited Mar 25, 2014 at 11:48

answered Mar 25, 2014 at 11:39

nikis

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2 Comments

Jimmyeao Over a year ago

Commenting out this line has no effect - the app still crashes with the same error

nikis Over a year ago

@Jimmyeao but you shouldn't comment this line. If you comment it, mapFragment will be definitely null

Piyush · Accepted Answer · 2014-03-25 12:02:01Z

0

Change here from

mapFragment = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.mapView));

to

mapFragment = ((MapFragment) getSupportFragmentManager().findFragmentById(R.id.mapView));

Because in your xml file you are using

android:name="com.google.android.gms.maps.MapFragment"

answered Mar 25, 2014 at 12:02

Piyush

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1 Comment

Piyush Over a year ago

But make one correction which he made a mistake.And this is not wrong.

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