title: Showing error Caused by: java.lang.reflect.InvocationTargetException
body: <p>When I press the button(named "current location") it should shows current location(lat &amp; long) on the textview(named "tvAddress") .But it's not working as I expect. It's giving me errors.Errors are given below.Can anyone help me plz</p>
  
  <p><strong>Error is :</strong> </p>
  
  <pre><code>02-05 23:37:22.429: E/AndroidRuntime(20293): FATAL EXCEPTION: main
  02-05 23:37:22.429: E/AndroidRuntime(20293): java.lang.IllegalStateException: Could not execute method of the activity
  02-05 23:37:22.429: E/AndroidRuntime(20293):    at android.view.View$1.onClick(View.java:3680)
  02-05 23:37:22.429: E/AndroidRuntime(20293):    at android.view.View.performClick(View.java:4191)
  02-05 23:37:22.429: E/AndroidRuntime(20293):    at android.view.View$PerformClick.run(View.java:17229)
  02-05 23:37:22.429: E/AndroidRuntime(20293):    at android.os.Handler.handleCallback(Handler.java:615)
  02-05 23:37:22.429: E/AndroidRuntime(20293):    at android.os.Handler.dispatchMessage(Handler.java:92)
  02-05 23:37:22.429: E/AndroidRuntime(20293):    at android.os.Looper.loop(Looper.java:137)
  02-05 23:37:22.429: E/AndroidRuntime(20293):    at android.app.ActivityThread.main(ActivityThread.java:4960)
  02-05 23:37:22.429: E/AndroidRuntime(20293):    at java.lang.reflect.Method.invokeNative(Native Method)
  02-05 23:37:22.429: E/AndroidRuntime(20293):    at java.lang.reflect.Method.invoke(Method.java:511)
  02-05 23:37:22.429: E/AndroidRuntime(20293):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
  02-05 23:37:22.429: E/AndroidRuntime(20293):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
  02-05 23:37:22.429: E/AndroidRuntime(20293):    at dalvik.system.NativeStart.main(Native Method)
  02-05 23:37:22.429: E/AndroidRuntime(20293): Caused by: java.lang.reflect.InvocationTargetException
  02-05 23:37:22.429: E/AndroidRuntime(20293):    at java.lang.reflect.Method.invokeNative(Native Method)
  02-05 23:37:22.429: E/AndroidRuntime(20293):    at java.lang.reflect.Method.invoke(Method.java:511)
  02-05 23:37:22.429: E/AndroidRuntime(20293):    at android.view.View$1.onClick(View.java:3675)
  02-05 23:37:22.429: E/AndroidRuntime(20293):    ... 11 more
  02-05 23:37:22.429: E/AndroidRuntime(20293): Caused by: java.lang.NullPointerException
  02-05 23:37:22.429: E/AndroidRuntime(20293):    at com.mamun.tasktest.MapActivity.marker(MapActivity.java:129)
  02-05 23:37:22.429: E/AndroidRuntime(20293):    ... 14 more
  </code></pre>
  
  <p><strong>MapActivity.java</strong></p>
  
  <pre><code>package com.mamun.tasktest;
  
  import java.io.IOException;
  import java.util.ArrayList;
  
  import android.app.Activity;
  import android.app.AlertDialog;
  import android.content.DialogInterface;
  import android.content.Intent;
  import android.location.Address;
  import android.location.Geocoder;
  import android.location.Location;
  import android.location.LocationManager;
  import android.os.Bundle;
  import android.provider.Settings;
  import android.view.View;
  import android.widget.Button;
  import android.widget.TextView;
  import android.widget.Toast;
  
  import com.google.android.gms.common.ConnectionResult;
  import com.google.android.gms.common.GooglePlayServicesClient;
  import com.google.android.gms.location.LocationClient;
  import com.google.android.gms.location.LocationListener;
  import com.google.android.gms.maps.GoogleMap;
  import com.google.android.gms.maps.MapFragment;
  import com.google.android.gms.maps.GoogleMap.OnMarkerDragListener;
  import com.google.android.gms.maps.model.BitmapDescriptorFactory;
  import com.google.android.gms.maps.model.LatLng;
  import com.google.android.gms.maps.model.Marker;
  import com.google.android.gms.maps.model.MarkerOptions;
  
  public class MapActivity extends Activity implements GooglePlayServicesClient.ConnectionCallbacks, GooglePlayServicesClient.OnConnectionFailedListener, LocationListener {
  
      private LocationManager manager;
      private TextView tvAddress;
      private Button btncurrent;
      private LocationClient locationClient;
      private GoogleMap googleMap;
      private MapFragment mapFragment;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          manager = (LocationManager) getSystemService(LOCATION_SERVICE);
          tvAddress = (TextView) findViewById(R.id.tvaddress);
          btncurrent= (Button)findViewById(R.id.btncurrent
          super.onCreate(savedInstanceState);
          setContentView(R.layout.map);
          locationClient = new LocationClient(this, this, this);
      }
  
      public void marker(View v) {
  
          Location currentLocation = locationClient.getLastLocation();
          tvAddress.setText(currentLocation.getLatitude()+" , "+ currentLocation.getLongitude());
          Geocoder geocoder = new Geocoder(this);
          try {
              ArrayList&lt;Address&gt; addresses = (ArrayList&lt;Address&gt;) geocoder.getFromLocation(currentLocation.getLatitude(), currentLocation.getLongitude(), 5);
              Address addr = addresses.get(0);
          } catch (IOException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
          }
      }
  
      @Override
      protected void onResume() {
          // TODO Auto-generated method stub
          super.onResume();
          locationClient.connect();
      }
      @Override
      protected void onPause() {
          // TODO Auto-generated method stub
          super.onPause();
          locationClient.disconnect();
      }
  
      @Override
      public void onLocationChanged(Location location) {
          // TODO Auto-generated method stub
  
      }
  
      @Override
      public void onConnectionFailed(ConnectionResult result) {
          // TODO Auto-generated method stub
  
      }
  
      @Override
      public void onConnected(Bundle connectionHint) {
  
      }
  
      @Override
      public void onDisconnected() {
          // TODO Auto-generated method stub
  
      }
  }
  </code></pre>
  
  <p><strong>map.xml</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical" &gt;
   &lt;LinearLayout
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:orientation="vertical" &gt;
  
      &lt;EditText
          android:id="@+id/etSearch"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:ems="10"
          android:hint="Search your location" &gt;
  
          &lt;requestFocus /&gt;
      &lt;/EditText&gt;
  
      &lt;TextView
          android:id="@+id/tvaddress"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:text="" /&gt;
  
      &lt;LinearLayout
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:orientation="horizontal" &gt;
  
          &lt;Button
              android:id="@+id/btncurrent"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:onClick="marker"
              android:text="Current Location"
                android:layout_marginLeft="98dp" /&gt;
  
          &lt;Button
              android:id="@+id/btnsave"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:text="Save" /&gt;
      &lt;/LinearLayout&gt;
      &lt;/LinearLayout&gt;
  
      &lt;FrameLayout
          android:id="@+id/map_container"
          android:layout_width="match_parent"
          android:layout_height="match_parent" &gt;
           &lt;fragment
              android:id="@+id/maps"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              class="com.google.android.gms.maps.MapFragment" /&gt;
  
      &lt;/FrameLayout&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>