drawer keep render behind the image or parent component for android

[jasonleewj85]

the drawer keep render be hide the image component or parent component for android.
Eg:
<View style={styles.container}> <Text>Login</Text> <Button label={'Login'} onPress={() => this.wisprMng()} /> <Drawer> <Message title="aaa" message="bbbbbbbbb" /> </Drawer> </View>

[fattahmuhyiddeen]

this should be solved in this PR #8