Error Message: You need to use a Theme.AppCompat theme with this activity

1
votes

This question has been asked so many times, but still i am unable to solve this problem.

I am trying to show Alert windows in my activity. Its giving me following error message

java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity

This is my code. 

public class CartActivity extends AppCompatActivity 

        btnCheckout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(cbApprove.isChecked()){

                    AlertDialog alertDialog = new AlertDialog.Builder(getApplicationContext()).create();
                    alertDialog.setTitle("Thanks");
                    alertDialog.setMessage("Thanks for participating in ticketing flow. The test ends here for the Beta");
                    alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "Ok", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            Intent i = new Intent(getApplicationContext(), MainActivity.class);
                            startActivity(i);
                        }
                    });

                    alertDialog.show();

                }
            }
        });

Manifest File

<activity
    android:name=".ticketing.activities.CartActivity"
    android:label="@string/title_activity_cart"
    android:theme="@style/AppTheme"

    ></activity>

Style v21

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
</style>

I have also changed the style of layout to AppComat.NoActionBarfrom Layout Design.

Error Message

 FATAL EXCEPTION: main
 Process: com.tixsee.mavs, PID: 15867
 java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
 at android.support.v7.app.AppCompatDelegateImplV7.createSubDecor(AppCompatDelegateImplV7.java:340)
 at android.support.v7.app.AppCompatDelegateImplV7.ensureSubDecor(AppCompatDelegateImplV7.java:309)
 at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:273)
 at android.support.v7.app.AppCompatDialog.setContentView(AppCompatDialog.java:80)
 at android.support.v7.app.AlertController.installContent(AlertController.java:214)
 at android.support.v7.app.AlertDialog.onCreate(AlertDialog.java:256)
 at android.app.Dialog.dispatchOnCreate(Dialog.java:463)
 at android.app.Dialog.show(Dialog.java:288)
 at com.tixsee.mavs.ticketing.activities.CartActivity$1.onClick(CartActivity.java:92)
 at android.view.View.performClick(View.java:5156)
 at android.view.View$PerformClick.run(View.java:20755)
 at android.os.Handler.handleCallback(Handler.java:739)
 at android.os.Handler.dispatchMessage(Handler.java:95)
 at android.os.Looper.loop(Looper.java:145)
 at android.app.ActivityThread.main(ActivityThread.java:5832)
 at java.lang.reflect.Method.invoke(Native Method)
 at java.lang.reflect.Method.invoke(Method.java:372)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
3
javaandroidandroid-layoutandroid-studio
go in mainfest and change activity theme – Kishan patel
Please post your entire stack trace. – CommonsWare
which activity u have got error change like that android:theme="@style/Theme.AppCompat" – Kishan patel
Yes its only for lollipop and higher version, @Kishanpatel i have changed activity theme from layout design. – dev90
Visit this link for solving to your problem. – Y.E.S.

3 Answers

5
votes

I guess the error is caused because of using AlertDialog in your code. You need to pass your activity's context instead of the application context to the alertdialog builder. Get the context in your AlertDialog Builder using getActivity() instead of using getApplicationContext(). Like this:

AlertDialog alertDialog = new AlertDialog.Builder(getActivity()).create();
1
votes

Use the following theme in your style

<style name="MyAlertDialogStyle" parent="Theme.AppCompat.Light.Dialog.Alert">
    <!-- Used for the buttons -->
    <item name="colorAccent">#FFC107</item>
    <!-- Used for the title and text -->
    <item name="android:textColorPrimary">#FFFFFF</item>
    <!-- Used for the background -->
    <item name="android:background">#4CAF50</item>
</style>
1
votes

Use this code

AlertDialog alertDialog = new AlertDialog.Builder(this).create();