警報對話框崩潰應用程序

Question

這已被問了很多次，並已被回答，我已經解決了這個問題，但這次卡住了，這是在一個地方工作，但在另一個活動中，它給了我以下錯誤消息。

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

以下是我的註冊類的代碼，同樣的類是爲登錄活動編寫的，並且其工作完美。

public class RegistrationActivity extends AppCompatActivity 

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


     if(sql_code.equalsIgnoreCase("0")){ 
      String resultCode= command1.getString("result"); 
      if(resultCode.equalsIgnoreCase("0")){ 
       AlertDialog alertDialog = new AlertDialog.Builder(getApplicationContext()).create(); 
       alertDialog.setTitle("Account Created"); 
       alertDialog.setMessage("Account Created Successfully."); 
       alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "OK", new DialogInterface.OnClickListener() { 
        @Override 
        public void onClick(DialogInterface dialog, int which) { 
         Intent i= new Intent(RegistrationActivity.this, LoginActivity.class); 
         startActivity(i); 
        } 
       }); 

       alertDialog.show(); 

清單文件

<activity 
     android:name=".ticketing.activities.checkout.RegistrationActivity" 
     android:screenOrientation="portrait" 
     android:label="@string/title_activity_registration" 
     android:theme="@style/AppTheme" /> 

Style.xml

<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> 
    <item name="android:fontFamily">Roboto</item> 
</style> 

萬事具備，但它仍然給我這個錯誤信息，請指引我，我什麼在這裏做錯了。

Answer 1

於第一線，從這個代碼

AlertDialog.Builder alertDialog= new AlertDialog.Builder(context); 
       alertDialog.setTitle("Account Created"); 
       alertDialog.setMessage("Account Created Successfully."); 
       alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "OK", new DialogInterface.OnClickListener() { 
        @Override 
        public void onClick(DialogInterface dialog, int which) { 
         Intent i= new Intent(RegistrationActivity.this, LoginActivity.class); 
         startActivity(i); 
        } 
       }); 

       alertDialog.show(); 

Answer 2

的對話框

Answer 3

//instead of using it 
AlertDialog alertDialog = new AlertDialog.Builder(getApplicationContext()).create(); 
//use It 
AlertDialog alertDialog = new AlertDialog.Builder(RegistrationActivity.this).create(); 

Answer 4

使用DialogFragment使用該生成器來創建您的對話框：

new AlertDialog.Builder(new ContextThemeWrapper(context, android.R.style.Theme_Dialog)) 

編輯：

另一種方式來解決這個問題是創建一個自定義樣式：

<style name="MyAlertDialogStyle" parent="Theme.AppCompat.Light.Dialog.Alert"> 
<!-- Used for the buttons --> 
<item name="colorAccent">_your_color_</item> 
<!-- Used for the title and text --> 
<item name="android:textColorPrimary">_your_color_</item> 
<!-- Used for the background --> 
<item name="android:background">_your_color_</item> 

然後構建對話框時使用它：

new AlertDialog.Builder(new ContextThemeWrapper(context, android.R.style.MyAlertDialogStyle)) 

Answer 5

變化extends AppCompatActivity更換你的對話框創建到extends Activity。

正如你可以在這裏看到 - https://stackoverflow.com/a/21815015/4425195