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POApp crashing on View.setOnClickListener
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  1. POApp crashing on View.setOnClickListener
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    copied!<p>I'm just starting in android development. I have a button on my main screen that i would like to open the dialer with a number in it, but for some reason, when ever i go to make the on click listener, the app crashes.</p> <p>I can take out the on click listener and the app opens fine. I have set the user permissions in the manifest also so it can't be this?</p> <p>Any help would be appreciated.</p> <p>Main Activity.java</p> <pre><code>info.androidhive.slidingmenu; import info.androidhive.slidingmenu.adapter.NavDrawerListAdapter; import info.androidhive.slidingmenu.model.NavDrawerItem; import java.util.ArrayList; import android.app.Activity; import android.app.Fragment; import android.app.FragmentManager; import android.content.Intent; import android.content.res.Configuration; import android.content.res.TypedArray; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.ActionBarDrawerToggle; import android.support.v4.widget.DrawerLayout; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.View.OnClickListener; import android.widget.AdapterView; import android.widget.Button; import android.widget.ListView; public class MainActivity extends Activity{ private DrawerLayout mDrawerLayout; private ListView mDrawerList; private ActionBarDrawerToggle mDrawerToggle; // nav drawer title private CharSequence mDrawerTitle; // used to store app title private CharSequence mTitle; // slide menu items private String[] navMenuTitles; private TypedArray navMenuIcons; private ArrayList&lt;NavDrawerItem&gt; navDrawerItems; private NavDrawerListAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button btnCall = (Button) findViewById(R.id.btnCall); btnCall.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v) { // TODO Auto-generated method stub Intent intent = new Intent(Intent.ACTION_DIAL); intent.setData(Uri.parse("tel:1231231234")); startActivity(intent); } }); mTitle = mDrawerTitle = getTitle(); // load slide menu items navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items); // nav drawer icons from resources navMenuIcons = getResources() .obtainTypedArray(R.array.nav_drawer_icons); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout); mDrawerList = (ListView) findViewById(R.id.list_slidermenu); navDrawerItems = new ArrayList&lt;NavDrawerItem&gt;(); // adding nav drawer items to array // Home navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1))); // Find People navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1))); // Photos navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1))); // Communities, Will add a counter here navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1))); // Pages navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1))); // What's hot, We will add a counter here navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1))); // Recycle the typed array navMenuIcons.recycle(); mDrawerList.setOnItemClickListener(new SlideMenuClickListener()); // setting the nav drawer list adapter adapter = new NavDrawerListAdapter(getApplicationContext(), navDrawerItems); mDrawerList.setAdapter(adapter); // enabling action bar app icon and behaving it as toggle button getActionBar().setDisplayHomeAsUpEnabled(true); getActionBar().setHomeButtonEnabled(true); mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.drawable.ic_drawer, //nav menu toggle icon R.string.app_name, // nav drawer open - description for accessibility R.string.app_name // nav drawer close - description for accessibility ) { public void onDrawerClosed(View view) { getActionBar().setTitle(mTitle); // calling onPrepareOptionsMenu() to show action bar icons invalidateOptionsMenu(); } public void onDrawerOpened(View drawerView) { getActionBar().setTitle(mDrawerTitle); // calling onPrepareOptionsMenu() to hide action bar icons invalidateOptionsMenu(); } }; mDrawerLayout.setDrawerListener(mDrawerToggle); if (savedInstanceState == null) { // on first time display view for first nav item displayView(0); } } /** * Slide menu item click listener * */ private class SlideMenuClickListener implements ListView.OnItemClickListener { @Override public void onItemClick(AdapterView&lt;?&gt; parent, View view, int position, long id) { // display view for selected nav drawer item displayView(position); } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // toggle nav drawer on selecting action bar app icon/title if (mDrawerToggle.onOptionsItemSelected(item)) { return true; } // Handle action bar actions click switch (item.getItemId()) { case R.id.action_settings: return true; default: return super.onOptionsItemSelected(item); } } /* * * Called when invalidateOptionsMenu() is triggered */ @Override public boolean onPrepareOptionsMenu(Menu menu) { // if nav drawer is opened, hide the action items boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList); menu.findItem(R.id.action_settings).setVisible(!drawerOpen); return super.onPrepareOptionsMenu(menu); } /** * Diplaying fragment view for selected nav drawer list item * */ private void displayView(int position) { // update the main content by replacing fragments Fragment fragment = null; switch (position) { case 0: fragment = new HomeFragment(); break; case 1: fragment = new FindPeopleFragment(); break; case 2: fragment = new PhotosFragment(); break; case 3: fragment = new CommunityFragment(); break; case 4: fragment = new PagesFragment(); break; case 5: fragment = new WhatsHotFragment(); break; default: break; } if (fragment != null) { FragmentManager fragmentManager = getFragmentManager(); fragmentManager.beginTransaction() .replace(R.id.frame_container, fragment).commit(); // update selected item and title, then close the drawer mDrawerList.setItemChecked(position, true); mDrawerList.setSelection(position); setTitle(navMenuTitles[position]); mDrawerLayout.closeDrawer(mDrawerList); } else { // error in creating fragment Log.e("MainActivity", "Error in creating fragment"); } } @Override public void setTitle(CharSequence title) { mTitle = title; getActionBar().setTitle(mTitle); } /** * When using the ActionBarDrawerToggle, you must call it during * onPostCreate() and onConfigurationChanged()... */ @Override protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); // Sync the toggle state after onRestoreInstanceState has occurred. mDrawerToggle.syncState(); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); // Pass any configuration change to the drawer toggls mDrawerToggle.onConfigurationChanged(newConfig); } } </code></pre> <p>LogCat:</p> <pre><code>12-27 07:06:03.832: E/AndroidRuntime(6925): at info.androidhive.slidingmenu.MainActivity.onCreate(MainActivity.java:54) 12-27 07:06:03.832: E/AndroidRuntime(6925): at android.app.Activity.performCreate(Activity.java:5231) 12-27 07:06:03.832: E/AndroidRuntime(6925): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 12-27 07:06:03.832: E/AndroidRuntime(6925): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2169) 12-27 07:06:03.832: E/AndroidRuntime(6925): ... 11 more 12-27 07:06:50.167: E/AndroidRuntime(7099): FATAL EXCEPTION: main 12-27 07:06:50.167: E/AndroidRuntime(7099): Process: info.androidhive.slidingmenu, PID: 7099 12-27 07:06:50.167: E/AndroidRuntime(7099): java.lang.RuntimeException: Unable to start activity ComponentInfo{info.androidhive.slidingmenu/info.androidhive.slidingmenu.MainActivity}: java.lang.NullPointerException 12-27 07:06:50.167: E/AndroidRuntime(7099): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2215) 12-27 07:06:50.167: E/AndroidRuntime(7099): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2265) 12-27 07:06:50.167: E/AndroidRuntime(7099): at android.app.ActivityThread.access$800(ActivityThread.java:145) 12-27 07:06:50.167: E/AndroidRuntime(7099): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1206) 12-27 07:06:50.167: E/AndroidRuntime(7099): at android.os.Handler.dispatchMessage(Handler.java:102) 12-27 07:06:50.167: E/AndroidRuntime(7099): at android.os.Looper.loop(Looper.java:136) 12-27 07:06:50.167: E/AndroidRuntime(7099): at android.app.ActivityThread.main(ActivityThread.java:5081) 12-27 07:06:50.167: E/AndroidRuntime(7099): at java.lang.reflect.Method.invokeNative(Native Method) 12-27 07:06:50.167: E/AndroidRuntime(7099): at java.lang.reflect.Method.invoke(Method.java:515) 12-27 07:06:50.167: E/AndroidRuntime(7099): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:781) 12-27 07:06:50.167: E/AndroidRuntime(7099): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 12-27 07:06:50.167: E/AndroidRuntime(7099): at dalvik.system.NativeStart.main(Native Method) 12-27 07:06:50.167: E/AndroidRuntime(7099): Caused by: java.lang.NullPointerException 12-27 07:06:50.167: E/AndroidRuntime(7099): at info.androidhive.slidingmenu.MainActivity.onCreate(MainActivity.java:54) 12-27 07:06:50.167: E/AndroidRuntime(7099): at android.app.Activity.performCreate(Activity.java:5231) 12-27 07:06:50.167: E/AndroidRuntime(7099): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 12-27 07:06:50.167: E/AndroidRuntime(7099): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2169) 12-27 07:06:50.167: E/AndroidRuntime(7099): ... 11 more </code></pre>
 

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