make delete-from-server working

jni/dc_wrapper.c

@@ -738,6 +738,12 @@ JNIEXPORT jstring Java_com_b44t_messenger_DcContext_imexHasBackup(JNIEnv *env, j
 }
 
 
+JNIEXPORT void Java_com_b44t_messenger_DcContext_emptyServer(JNIEnv *env, jobject obj, jint flags)
+{
+	dc_empty_server(get_dc_context(env, obj), flags);
+}
+
+
 JNIEXPORT jint Java_com_b44t_messenger_DcContext_addAddressBook(JNIEnv *env, jobject obj, jstring adrbook)
 {
 	CHAR_REF(adrbook);

res/layout/empty_folder_options.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <LinearLayout
+        android:orientation="vertical"
+        android:layout_marginLeft="20dp"
+        android:layout_marginRight="20dp"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <CheckBox
+            android:id="@+id/empty_inbox_folder"
+            android:text="Delete ALL messages in Inbox folder"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            />
+
+        <CheckBox
+            android:id="@+id/empty_deltachat_folder"
+            android:text="Delete ALL messages in DeltaChat folder"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            />
+
+    </LinearLayout>
+
+</FrameLayout>

res/xml/preferences_advanced.xml

@@ -42,16 +42,16 @@
     <PreferenceCategory android:layout="@layout/preference_divider" />
 
 
-    <PreferenceCategory android:title="Experimental features">
+    <PreferenceCategory android:title="Experimenta  l features">
+
+        <Preference android:key="pref_empty_server_folders"
+                    android:title="Empty server folders" />
 
         <org.thoughtcrime.securesms.components.SwitchPreferenceCompat
             android:defaultValue="false"
             android:key="pref_location_streaming_enabled"
             android:title="On-demand location streaming"/>
 
-        <Preference android:key="pref_empty_server_folders"
-                    android:title="Empty server folders" />
-
     </PreferenceCategory>
     <PreferenceCategory android:layout="@layout/preference_divider" />
 

src/com/b44t/messenger/DcContext.java

@@ -69,6 +69,9 @@ public class DcContext {
     public final static int DC_SHOW_EMAILS_ACCEPTED_CONTACTS = 1;
     public final static int DC_SHOW_EMAILS_ALL               = 2;
 
+    public final static int DC_EMPTY_MVBOX           = 0x01;
+    public final static int DC_EMPTY_INBOX           = 0x02;
+
     public DcContext(String osName) {
         handleEvent(0,0,0); // call handleEvent() to make sure it is not optimized away and JNI won't find it
         contextCPtr = createContextCPtr(osName);
@@ -105,6 +108,7 @@ public class DcContext {
     public native boolean      continueKeyTransfer  (int msg_id, String setup_code);
     public native void         imex                 (int what, String dir);
     public native String       imexHasBackup        (String dir);
+    public native void         emptyServer          (int flags);
     public native int          checkPassword        (String pw);
     public native boolean      mayBeValidAddr       (String addr);
     public native int          lookupContactIdByAddr(String addr);

src/org/thoughtcrime/securesms/preferences/AdvancedPreferenceFragment.java

@@ -288,20 +288,23 @@ public class AdvancedPreferenceFragment extends ListSummaryPreferenceFragment
     public boolean onPreferenceClick(Preference preference) {
       View gl = View.inflate(getActivity(), R.layout.empty_folder_options, null);
       new AlertDialog.Builder(getActivity())
-          .setTitle("Empty folders on server")
-          .setMessage("This will delete all messages in the given folders on the server.")
+          .setTitle("Empty server folders")
+          .setMessage("This function helps to free space on your server by deleting messages in the given folders. Messages on this device will not be deleted.")
           .setView(gl)
           .setNegativeButton(R.string.cancel, null)
-          .setPositiveButton(R.string.ok, (dialog, which) -> {
+          .setPositiveButton("Delete messages", (dialog, which) -> {
             int flags = 0;
-            CheckBox cb = gl.findViewById(R.id.empty_inbox_chat_folder);
+            CheckBox cb = gl.findViewById(R.id.empty_inbox_folder);
             if (cb!=null && cb.isChecked()) {
-              flags |= DC_EMPTY_INBOX;
+              flags |= DcContext.DC_EMPTY_INBOX;
             }
+            cb = gl.findViewById(R.id.empty_deltachat_folder);
             if (cb!=null && cb.isChecked()) {
-              flags |= DC_EMPTY_MVBOX;
+              flags |= DcContext.DC_EMPTY_MVBOX;
+            }
+            if (flags!=0) {
+              dcContext.emptyServer(flags);
             }
-
           })
           .show();
       return true;