allow user to disable ACRA entirely with a preference

ACRA is sometimes problematic or annoying.  Also, whitelabel versions might
want to disable ACRA.  The setting the preference defaultValue is an easy
way to do that.

refs #1483

app/src/basic/res/xml/preferences.xml

@@ -110,13 +110,16 @@
     <android.support.v7.preference.PreferenceCategory
             android:key="pref_category_privacy"
             android:title="@string/privacy">
-
+        <SwitchPreference
+                android:key="promptToSendCrashReports"
+                android:title="@string/prompt_to_send_crash_reports"
+                android:summary="@string/prompt_to_send_crash_reports_summary"
+                android:defaultValue="true"/>
         <SwitchPreference
                 android:defaultValue="false"
                 android:key="preventScreenshots"
                 android:summary="@string/preventScreenshots_summary"
                 android:title="@string/preventScreenshots_title"/>
-
     </android.support.v7.preference.PreferenceCategory>
 
     <android.support.v7.preference.PreferenceCategory

app/src/main/java/org/fdroid/fdroid/FDroidApp.java

@@ -350,9 +350,11 @@ public class FDroidApp extends Application {
         Preferences.setup(this);
         Languages.setLanguage(this);
 
-        ACRA.init(this);
+        if (Preferences.get().promptToSendCrashReports()) {
-        if (isAcraProcess() || HidingManager.isHidden(this)) {
+            ACRA.init(this);
-            return;
+            if (isAcraProcess() || HidingManager.isHidden(this)) {
+                return;
+            }
         }
 
         PRNGFixes.apply();

app/src/main/java/org/fdroid/fdroid/Preferences.java

@@ -84,6 +84,7 @@ public final class Preferences implements SharedPreferences.OnSharedPreferenceCh
     public static final String PREF_SHOW_ROOT_APPS = "rooted";
     public static final String PREF_SHOW_ANTI_FEATURE_APPS = "showAntiFeatureApps";
     public static final String PREF_FORCE_TOUCH_APPS = "ignoreTouchscreen";
+    public static final String PREF_PROMPT_TO_SEND_CRASH_REPORTS = "promptToSendCrashReports";
     public static final String PREF_KEEP_CACHE_TIME = "keepCacheFor";
     public static final String PREF_UNSTABLE_UPDATES = "unstableUpdates";
     public static final String PREF_KEEP_INSTALL_HISTORY = "keepInstallHistory";
@@ -173,6 +174,10 @@ public final class Preferences implements SharedPreferences.OnSharedPreferenceCh
         initialized.put(key, false);
     }
 
+    public boolean promptToSendCrashReports() {
+        return preferences.getBoolean(PREF_PROMPT_TO_SEND_CRASH_REPORTS, IGNORED_B);
+    }
+
     public boolean isForceOldIndexEnabled() {
         return preferences.getBoolean(PREF_FORCE_OLD_INDEX, IGNORED_B);
     }

app/src/main/res/values/strings.xml

@@ -12,6 +12,10 @@
     <string name="by_author_format">by %s</string>
     <string name="delete">Delete</string>
     <string name="enable_nfc_send">Enable NFC Send…</string>
+    <string name="prompt_to_send_crash_reports">Prompt to send crash reports</string>
+    <string name="prompt_to_send_crash_reports_summary">Gather data about crashes and ask to send them to the
+        developer
+    </string>
     <string name="cache_downloaded">Keep cached apps</string>
     <string name="updates">Updates</string>
     <string name="unstable_updates">Unstable updates</string>

app/src/main/res/xml/preferences.xml

@@ -116,7 +116,11 @@
     <android.support.v7.preference.PreferenceCategory
             android:key="pref_category_privacy"
             android:title="@string/privacy">
-
+        <SwitchPreference
+                android:key="promptToSendCrashReports"
+                android:title="@string/prompt_to_send_crash_reports"
+                android:summary="@string/prompt_to_send_crash_reports_summary"
+                android:defaultValue="true"/>
         <SwitchPreference
                 android:defaultValue="false"
                 android:key="preventScreenshots"
@@ -137,7 +141,6 @@
                     android:targetClass="org.fdroid.fdroid.views.panic.PanicPreferencesActivity"
                     android:targetPackage="@string/applicationId"/>
         </android.support.v7.preference.PreferenceScreen>
-
     </android.support.v7.preference.PreferenceCategory>
 
     <android.support.v7.preference.PreferenceCategory