You need to use a Theme.AppCompat theme (or descendant) with this activity. Change to Theme.AppCompat causes other error

Question

I use appcompat v22.1.0 in my App and use Toolbar. Everything was fine when I use Theme.AppCompat.Light.NoActionBar. When I start implement AlertDialog, it produce error like this:

java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.         at android.support.v7.app.AppCompatDelegateImplBase.onCreate(AppCompatDelegateImplBase.java:113)         at android.support.v7.app.AppCompatDelegateImplV7.onCreate(AppCompatDelegateImplV7.java:146)         at android.support.v7.app.AppCompatDialog.<init>(AppCompatDialog.java:47)         at android.support.v7.app.AlertDialog.<init>(AlertDialog.java:92)         at android.support.v7.app.AlertDialog$Builder.create(AlertDialog.java:882)         at com.ramabmtr.map.findingmoo.MainActivity.onOptionsItemSelected(MainActivity.java:216)         at android.app.Activity.onMenuItemSelected(Activity.java:2572)         at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:353)         at android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:144)         at android.support.v7.internal.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:99)         at android.support.v7.internal.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:99)         at android.support.v7.internal.app.ToolbarActionBar$2.onMenuItemClick(ToolbarActionBar.java:74)         at android.support.v7.widget.Toolbar$1.onMenuItemClick(Toolbar.java:164)         at android.support.v7.widget.ActionMenuView$MenuBuilderCallback.onMenuItemSelected(ActionMenuView.java:740)         at android.support.v7.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:802)         at android.support.v7.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:153)         at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:949)         at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:939)         at android.support.v7.widget.ActionMenuView.invokeItem(ActionMenuView.java:598)         at android.support.v7.internal.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:139)         at android.view.View.performClick(View.java:4084)         at android.view.View$PerformClick.run(View.java:16989)         at android.os.Handler.handleCallback(Handler.java:615)         at android.os.Handler.dispatchMessage(Handler.java:92)         at android.os.Looper.loop(Looper.java:137)         at android.app.ActivityThread.main(ActivityThread.java:4812)         at java.lang.reflect.Method.invokeNative(Native Method)         at java.lang.reflect.Method.invoke(Method.java:511)         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:559)         at dalvik.system.NativeStart.main(Native Method) 

Based on that error, I change my theme to Theme.AppCompat and put this:

<item name="windowActionBar">false</item> <item name="windowNoTitle">true</item> 

to my theme. But it produce the same error.

Style.xml (old)

<resources> <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">     <item name="colorPrimary">@color/colorPrimary</item>     <item name="colorPrimaryDark">@color/colorPrimaryDark</item> </style> </resources> 

Style.xml (new)

<resources> <style name="AppTheme" parent="Theme.AppCompat">     <item name="windowActionBar">false</item>     <item name="windowNoTitle">true</item>     <item name="colorPrimary">@color/colorPrimary</item>     <item name="colorPrimaryDark">@color/colorPrimaryDark</item> </style> </resources> 

Anyone knows how to fix it??

MainActivity.java

package com.ramabmtr.map.findingmoo;  import android.content.DialogInterface; import android.graphics.Typeface; import android.os.Bundle; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBarDrawerToggle; import android.support.v7.app.AlertDialog; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.Toolbar; import android.view.View; import android.widget.TextView; import android.widget.Toast;  public class MainActivity extends AppCompatActivity {  private Toolbar toolbar; private TextView toolbarTitle;  @Override protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);      toolbar = (Toolbar) findViewById(R.id.toolbar);     setSupportActionBar(toolbar);     getSupportActionBar().setDisplayShowTitleEnabled(false);      Typeface myTypeface = Typeface.createFromAsset(getAssets(), "fonts/panpizza.ttf");     toolbarTitle = (TextView) findViewById(R.id.toolbar_title);     toolbarTitle.setTypeface(myTypeface);      AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());     builder.setTitle(R.string.filter_title);     builder.setMessage("test");     builder.setPositiveButton(R.string.ok_button, new DialogInterface.OnClickListener() {         @Override         public void onClick(DialogInterface dialog, int id) {             dialog.dismiss();         }     });     builder.setNegativeButton(R.string.cancel_button, new DialogInterface.OnClickListener() {         @Override         public void onClick(DialogInterface dialog, int id) {             dialog.dismiss();         }     });     AlertDialog dialog = builder.create();     dialog.show(); } } 

Answer 1

Fixed my problem by using MainActivity.this (or YourActivityName.this)

AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this); 

Make sure you already Theme.AppCompat and extending AppCompatActivity.