Enhance log with scroll and zoom possibility

AndroidManifest.xml

@@ -199,7 +199,7 @@
     </activity>
 
     <activity android:name=".LogViewActivity"
-              android:label="@string/pref_view_log"
+              android:label="@string/pref_log_header"
               android:windowSoftInputMode="stateHidden"
               android:configChanges="touchscreen|keyboard|keyboardHidden|orientation|screenLayout|screenSize"/>
 

res/layout/log_view_activity.xml

@@ -6,6 +6,4 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
-
-
 </LinearLayout>

res/menu/view_log.xml

@@ -1,8 +1,15 @@
 <?xml version="1.0" encoding="utf-8"?>
-<menu xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto">
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
 
     <item android:title="@string/menu_copy_to_clipboard"
         android:id="@+id/copy_log_to_clipboard" />
+    <item android:title="@string/menu_zoom_in"
+        android:id="@+id/log_zoom_in" />
+    <item android:title="@string/menu_zoom_out"
+        android:id="@+id/log_zoom_out" />
+    <item android:title="@string/menu_scroll_to_bottom"
+        android:id="@+id/log_scroll_down" />
+    <item android:title="@string/menu_scroll_to_top"
+        android:id="@+id/log_scroll_up" />
 
 </menu>

res/values/strings.xml

@@ -136,6 +136,7 @@
     <string name="menu_play">Play</string>
     <string name="menu_pause">Pause</string>
     <string name="menu_scroll_to_bottom">Scroll to the bottom</string>
+    <string name="menu_scroll_to_top">Scroll to the top</string>
     <string name="menu_invite">Invite friends</string>
     <string name="menu_help">Help</string>
     <string name="menu_select_all">Select all</string>
@@ -146,6 +147,8 @@
     <string name="menu_deaddrop">Contact requests</string>
     <string name="menu_deaddrop_subtitle">Press message to start chatting</string>
     <string name="menu_view_profile">View profile</string>
+    <string name="menu_zoom_in">Zoom in</string>
+    <string name="menu_zoom_out">Zoom out</string>
     <string name="title_share_location">Share location with all group members</string>
 
     <string name="mute_for_one_hour">Mute for 1 hour</string>
@@ -380,6 +383,7 @@
     <string name="pref_in_chat_sounds">In-chat sounds</string>
     <string name="pref_message_text_size">Message font size</string>
     <string name="pref_view_log">View log</string>
+    <string name="pref_log_header">Log</string>
     <string name="pref_other">Other</string>
     <string name="pref_backup">Backup</string>
     <string name="pref_backup_explain">Backup chats to external storage</string>

src/org/thoughtcrime/securesms/LogViewActivity.java

@@ -56,15 +56,29 @@ public class LogViewActivity extends BaseActionBarActivity {
   @Override
   public boolean onOptionsItemSelected(MenuItem item) {
     super.onOptionsItemSelected(item);
+    Float newSize;
     switch (item.getItemId()) {
       case android.R.id.home:
         finish();
         return true;
-
       case R.id.copy_log_to_clipboard:
         Util.writeTextToClipboard(this, logViewFragment.getLogText());
         Toast.makeText(getApplicationContext(), R.string.done, Toast.LENGTH_SHORT).show();
         return true;
+      case R.id.log_zoom_in:
+        newSize = logViewFragment.getLogTextSize() + 2.0f;
+        logViewFragment.setLogTextSize(newSize);
+        return false;
+      case R.id.log_zoom_out:
+        newSize = logViewFragment.getLogTextSize() - 2.0f;
+        logViewFragment.setLogTextSize(newSize);
+        return false;
+      case R.id.log_scroll_down:
+        logViewFragment.scrollDownLog();
+        return false;
+      case R.id.log_scroll_up:
+        logViewFragment.scrollUpLog();
+        return false;
     }
 
     return false;

src/org/thoughtcrime/securesms/LogViewFragment.java

@@ -30,6 +30,7 @@ import android.os.PowerManager;
 import android.support.v4.app.Fragment;
 import android.text.TextUtils;
 import android.util.Log;
+import android.util.TypedValue;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -84,6 +85,16 @@ public class LogViewFragment extends Fragment {
     return logPreview==null? "null" : logPreview.getText().toString();
   }
 
+  public Float getLogTextSize() { return logPreview.getTextSize(); }
+
+  public void setLogTextSize(Float Textsize) {
+    logPreview.setTextSize(TypedValue.COMPLEX_UNIT_PX, Textsize);
+  }
+
+  public void scrollDownLog() { logPreview.setSelection(logPreview.getText().length()); }
+
+  public void scrollUpLog() { logPreview.setSelection(0); }
+
   private static String grabLogcat() {
     try {
       final Process         process        = Runtime.getRuntime().exec("logcat -v threadtime -d");