feature: allow to keep screen on

app/src/main/java/com/termux/app/TermuxActivity.java

@@ -90,6 +90,7 @@ public final class TermuxActivity extends Activity implements ServiceConnection
     private static final int CONTEXTMENU_RESET_TERMINAL_ID = 5;
     private static final int CONTEXTMENU_STYLING_ID = 6;
     private static final int CONTEXTMENU_HELP_ID = 8;
+    private static final int CONTEXTMENU_TOGGLE_KEEP_SCREEN_ON = 9;
 
     private static final int MAX_SESSIONS = 8;
 
@@ -210,6 +211,7 @@ public final class TermuxActivity extends Activity implements ServiceConnection
         mTerminalView.setOnKeyListener(new TermuxViewClient(this));
 
         mTerminalView.setTextSize(mSettings.getFontSize());
+        mTerminalView.setKeepScreenOn(mSettings.isScreenAlwaysOn());
         mTerminalView.requestFocus();
 
         final ViewPager viewPager = findViewById(R.id.viewpager);
@@ -637,6 +639,7 @@ public final class TermuxActivity extends Activity implements ServiceConnection
         menu.add(Menu.NONE, CONTEXTMENU_KILL_PROCESS_ID, Menu.NONE, getResources().getString(R.string.kill_process, getCurrentTermSession().getPid())).setEnabled(currentSession.isRunning());
         menu.add(Menu.NONE, CONTEXTMENU_STYLING_ID, Menu.NONE, R.string.style_terminal);
         menu.add(Menu.NONE, CONTEXTMENU_HELP_ID, Menu.NONE, R.string.help);
+        menu.add(Menu.NONE, CONTEXTMENU_TOGGLE_KEEP_SCREEN_ON, Menu.NONE, R.string.toggle_keep_screen_on).setCheckable(true).setChecked(mSettings.isScreenAlwaysOn());
     }
 
     /** Hook system menu to show context menu instead. */
@@ -756,6 +759,16 @@ public final class TermuxActivity extends Activity implements ServiceConnection
             case CONTEXTMENU_HELP_ID:
                 startActivity(new Intent(this, TermuxHelpActivity.class));
                 return true;
+            case CONTEXTMENU_TOGGLE_KEEP_SCREEN_ON: {
+                if(mTerminalView.getKeepScreenOn()) {
+                    mTerminalView.setKeepScreenOn(false);
+                    mSettings.setScreenAlwaysOn(this, false);
+                } else {
+                    mTerminalView.setKeepScreenOn(true);
+                    mSettings.setScreenAlwaysOn(this, true);
+                }
+                return true;
+            }
             default:
                 return super.onContextItemSelected(item);
         }

app/src/main/java/com/termux/app/TermuxPreferences.java

@@ -40,7 +40,9 @@ final class TermuxPreferences {
     private static final String SHOW_EXTRA_KEYS_KEY = "show_extra_keys";
     private static final String FONTSIZE_KEY = "fontsize";
     private static final String CURRENT_SESSION_KEY = "current_session";
+    private static final String SCREEN_ALWAYS_ON_KEY = "screen_always_on";
 
+    private boolean mScreenAlwaysOn;
     private int mFontSize;
 
     @AsciiBellBehaviour
@@ -67,6 +69,7 @@ final class TermuxPreferences {
         MIN_FONTSIZE = (int) (4f * dipInPixels);
 
         mShowExtraKeys = prefs.getBoolean(SHOW_EXTRA_KEYS_KEY, true);
+        mScreenAlwaysOn = prefs.getBoolean(SCREEN_ALWAYS_ON_KEY, false);
 
         // http://www.google.com/design/spec/style/typography.html#typography-line-height
         int defaultFontSize = Math.round(12 * dipInPixels);
@@ -103,6 +106,15 @@ final class TermuxPreferences {
         prefs.edit().putString(FONTSIZE_KEY, Integer.toString(mFontSize)).apply();
     }
 
+    boolean isScreenAlwaysOn() {
+        return mScreenAlwaysOn;
+    }
+
+    void setScreenAlwaysOn(Context context, boolean newValue) {
+        mScreenAlwaysOn = newValue;
+        PreferenceManager.getDefaultSharedPreferences(context).edit().putBoolean(SCREEN_ALWAYS_ON_KEY, newValue).apply();
+    }
+
     static void storeCurrentSession(Context context, TerminalSession session) {
         PreferenceManager.getDefaultSharedPreferences(context).edit().putString(TermuxPreferences.CURRENT_SESSION_KEY, session.mHandle).apply();
     }

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

@@ -9,6 +9,7 @@
    <string name="style_terminal">Style</string>
    <string name="share_transcript_title">Terminal transcript</string>
    <string name="help">Help</string>
+   <string name="toggle_keep_screen_on">Keep screen on</string>
 
    <string name="bootstrap_installer_body">Installing…</string>
    <string name="bootstrap_error_title">Unable to install</string>