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To set a breakpoint, click the left margin (the line number ruler) in the source area. Clicking once sets a breakpoint, which should also show up in the Breakpoints area on the left. Clicking again removes the breakpoint.

Set breakpoints in source code To set a breakpoint in source code, click in the far left margin next to a line of code . You can also select the line and press F9, select Debug > Toggle Breakpoint, or right-click and select Breakpoint > Insert breakpoint. The breakpoint appears as a red dot in the left margin.

Open Dart DevTools to debug the app that’s running in the current window.

GDB normally ignores breakpoints when it resumes execution, until at least one instruction has been executed . If it did not do this, you would be unable to proceed past a breakpoint without first disabling the breakpoint. This rule applies whether or not the breakpoint already existed when your program stopped.

If a source file has changed and the source no longer matches the code you’re debugging , the debugger won’t set breakpoints in the code by default. Normally, this problem happens when a source file is changed, but the source code wasn’t rebuilt. To fix this issue, rebuild the project.