basic switch implementation

src/org/thoughtcrime/securesms/ConversationListActivity.java

@@ -262,7 +262,8 @@ public class ConversationListActivity extends PassphraseRequiredActionBarActivit
   }
 
   private void handleSwitchAccount() {
-    ArrayList<AccountManager.Account> accounts = AccountManager.getInstance().getAccounts(this);
+    AccountManager accountManager = AccountManager.getInstance();
+    ArrayList<AccountManager.Account> accounts = accountManager.getAccounts(this);
 
     // build menu
     ArrayList<String> menu = new ArrayList<>();
@@ -284,11 +285,16 @@ public class ConversationListActivity extends PassphraseRequiredActionBarActivit
       .setNegativeButton(R.string.cancel, null)
       .setItems(menu.toArray(new String[menu.size()]), (dialog, which) -> {
         if (which==addAccount) {
-          ;
+          accountManager.prepareToAddAccount(this);
+          Intent intent = new Intent(this, WelcomeActivity.class);
+          startActivity(intent);
+          finish();
         } else if (which==deleteAccount) {
           ;
         } else { // switch account
-          ;
+          accountManager.switchAccount(this, accounts.get(which));
+          finish();
+          startActivity(new Intent(getApplicationContext(), ConversationListActivity.class));
         }
       })
       .show();

src/org/thoughtcrime/securesms/connect/AccountManager.java

@@ -13,13 +13,6 @@ public class AccountManager {
 
     private static AccountManager self;
 
-    public static AccountManager getInstance() {
-        if (self == null) {
-            self = new AccountManager();
-        }
-        return self;
-    }
-
     public class Account {
         private String file;
         private String displayname;
@@ -41,7 +34,7 @@ public class AccountManager {
         }
     };
 
-    public @Nullable Account maybeGetAccount(File file) {
+    private @Nullable Account maybeGetAccount(File file) {
         try {
             if (!file.isDirectory() && file.getName().endsWith(".db")) {
                 DcContext testContext = new DcContext(null);
@@ -60,6 +53,29 @@ public class AccountManager {
         return null;
     }
 
+    private File getUniqueDbName(Context context) {
+        File dir = context.getFilesDir();
+        int index = 1;
+        while (true) {
+            File test = new File(dir, String.format("messenger-%d.db", index));
+            File testBlobdir = new File(dir, String.format("messenger-%d.db-blobs", index));
+            if (!test.exists() && !testBlobdir.exists()) {
+                return test;
+            }
+            index++;
+        }
+    }
+
+
+    // public api
+
+    public static AccountManager getInstance() {
+        if (self == null) {
+            self = new AccountManager();
+        }
+        return self;
+    }
+
     public ArrayList<Account> getAccounts(Context context) {
         ArrayList<Account> result = new ArrayList<>();
 
@@ -78,4 +94,20 @@ public class AccountManager {
 
         return result;
     }
+
+    public void prepareToAddAccount(Context context) {
+        File newDb = getUniqueDbName(context);
+    }
+
+    public void cancelAccountAdding(Context context) {
+
+    }
+
+    public void switchAccount(Context context, Account account) {
+
+    }
+
+    public File getSelectedAccount(Context context) {
+        return new File(context.getFilesDir(), "messenger.db");
+    }
 }

src/org/thoughtcrime/securesms/connect/ApplicationDcContext.java

@@ -54,7 +54,7 @@ public class ApplicationDcContext extends DcContext {
     super("Android "+BuildConfig.VERSION_NAME);
     this.context = context;
 
-    File dbfile = new File(context.getFilesDir(), "messenger.db");
+    File dbfile = AccountManager.getInstance().getSelectedAccount(context);
     open(dbfile.getAbsolutePath());
 
     try {