Reword the very confusing screen security setting

res/values/strings.xml

@@ -686,7 +686,7 @@
     <string name="preferences__disable_local_encryption_of_messages_and_keys">Disable local encryption of messages and keys</string>
     <string name="preferences__screen_security">Screen security</string>
     <string name="preferences__automatically_complete_key_exchanges_for_new_sessions_or_for_existing_sessions_with_the_same_identity_key">Automatically complete key exchanges for new sessions or for existing sessions with the same identity key</string>
-    <string name="preferences__disable_screen_security_to_allow_screen_shots">Disable screen security to allow screen shots</string>
+    <string name="preferences__disable_screen_security_to_allow_screen_shots">Block screenshots in the recents list and inside the app</string>
     <string name="preferences__forget_passphrase_from_memory_after_some_interval">Forget passphrase from memory after some interval</string>
     <string name="preferences__timeout_passphrase">Timeout passphrase</string>
     <string name="preferences__pref_timeout_interval_dialogtitle">Select passphrase timeout</string>

src/org/thoughtcrime/securesms/ApplicationPreferencesActivity.java

@@ -217,8 +217,8 @@ public class ApplicationPreferencesActivity extends PassphraseRequiredSherlockPr
       pushSmsCategory.removePreference(defaultPreference);
     }
 
-    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1 &&
+    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.ICE_CREAM_SANDWICH &&
-        advancedCategory != null                                   &&
+        advancedCategory != null                                       &&
         screenSecurityPreference != null)
     {
       advancedCategory.removePreference(screenSecurityPreference);

src/org/thoughtcrime/securesms/ConversationActivity.java

@@ -690,6 +690,14 @@ public class ConversationActivity extends PassphraseRequiredSherlockFragmentActi
     drawables.recycle();
 
     calculateCharactersRemaining();
+
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
+      if (TextSecurePreferences.isScreenSecurityEnabled(this)) {
+        getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
+      } else {
+        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_SECURE);
+      }
+    }
   }
 
   private void initializeMmsEnabledCheck() {
@@ -753,10 +761,6 @@ public class ConversationActivity extends PassphraseRequiredSherlockFragmentActi
     });
 
     registerForContextMenu(sendButton);
-
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB && TextSecurePreferences.isScreenSecurityEnabled(this)) {
-      getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
-    }
   }
 
   private void initializeReceivers() {

src/org/thoughtcrime/securesms/ConversationListActivity.java

@@ -86,6 +86,7 @@ public class ConversationListActivity extends PassphraseRequiredSherlockFragment
     dynamicLanguage.onResume(this);
 
     initializeDefaultMessengerCheck();
+    initializeSecurity();
   }
 
   @Override
@@ -279,11 +280,6 @@ public class ConversationListActivity extends PassphraseRequiredSherlockFragment
   }
 
   private void initializeResources() {
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB && TextSecurePreferences.isScreenSecurityEnabled(this)) {
-      getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE,
-                           WindowManager.LayoutParams.FLAG_SECURE);
-    }
-
     this.drawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout);
     this.drawerList   = (ListView)findViewById(R.id.left_drawer);
     this.masterSecret = getIntent().getParcelableExtra("master_secret");
@@ -303,6 +299,16 @@ public class ConversationListActivity extends PassphraseRequiredSherlockFragment
     }
   }
 
+  private void initializeSecurity() {
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
+      if (TextSecurePreferences.isScreenSecurityEnabled(this)) {
+        getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
+      } else {
+        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_SECURE);
+      }
+    }
+  }
+
   class DrawerToggle extends ActionBarDrawerToggle {
 
     public DrawerToggle(Activity activity, DrawerLayout drawerLayout,

src/org/thoughtcrime/securesms/ShareActivity.java

@@ -72,6 +72,7 @@ public class ShareActivity extends PassphraseRequiredSherlockFragmentActivity
     dynamicTheme.onResume(this);
     dynamicLanguage.onResume(this);
     getSupportActionBar().setTitle(R.string.ShareActivity_share_with);
+    initializeSecurity();
   }
 
   @Override
@@ -132,11 +133,6 @@ public class ShareActivity extends PassphraseRequiredSherlockFragmentActivity
   }
 
   private void initializeResources() {
-    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB && TextSecurePreferences.isScreenSecurityEnabled(this)) {
-      getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE,
-                           WindowManager.LayoutParams.FLAG_SECURE);
-    }
-
     this.masterSecret = getIntent().getParcelableExtra(MASTER_SECRET_EXTRA);
 
     this.fragment = (ShareFragment)this.getSupportFragmentManager()
@@ -145,6 +141,16 @@ public class ShareActivity extends PassphraseRequiredSherlockFragmentActivity
     this.fragment.setMasterSecret(masterSecret);
   }
 
+  private void initializeSecurity() {
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
+      if (TextSecurePreferences.isScreenSecurityEnabled(this)) {
+        getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
+      } else {
+        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_SECURE);
+      }
+    }
+  }
+
   private Intent getBaseShareIntent(final Class<?> target) {
     final Intent intent = new Intent(this, target);
     final Intent originalIntent = getIntent();