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Fix the Systrace profiling example #5253

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Fix the Systrace profiling example #5253

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18 changes: 3 additions & 15 deletions docs/systrace.md
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Original file line number Diff line number Diff line change
Expand Up @@ -7,20 +7,16 @@ title: Systrace

## Example

`Systrace` allows you to mark JavaScript (JS) events with a tag and an integer value. Capture the non-Timed JS events in EasyProfiler.
`Systrace` allows you to mark JavaScript (JS) events with a tag and an integer value. Start profiling with an Android profiling tool such as Perfetto or EasyProfiler, then use these markers to identify the events in the captured trace.

```SnackPlayer name=Systrace%20Example
import {Button, Text, View, StyleSheet, Systrace} from 'react-native';
import {SafeAreaView, SafeAreaProvider} from 'react-native-safe-area-context';

const App = () => {
const enableProfiling = () => {
Systrace.setEnabled(true); // Call setEnabled to turn on the profiling.
const markEvent = () => {
Systrace.beginEvent('event_label');
Systrace.counterEvent('event_label', 10);
};

const stopProfiling = () => {
Systrace.endEvent();
};

Expand All @@ -31,15 +27,7 @@ const App = () => {
React Native Systrace API
</Text>
<View style={styles.buttonsColumn}>
<Button
title="Capture the non-Timed JS events in EasyProfiler"
onPress={() => enableProfiling()}
/>
<Button
title="Stop capturing"
onPress={() => stopProfiling()}
color="#FF0000"
/>
<Button title="Mark event" onPress={markEvent} />
</View>
</SafeAreaView>
</SafeAreaProvider>
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