A national "shutdown" protest last week closed many businesses, shops and schools, with public transport and some government departments and courts also ceasing to function.
The strike on Wednesday followed protests triggered by an outbreak of demonstrations on the outskirts of Harare over police accused of using road blocks to extort cash from motorists.
Further shutdowns are planned tomorrow and on Thursday in a surge of public anger over the country's worsening economic crisis and opposition to the authoritarian regime of Mugabe, 92.
"(Mawarire) has been charged with inciting public violence," his lawyer Harrison Nkomo told AFP after the Baptist pastor reported to a police station in central Harare where he had been summoned for questioning.
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Mawarire, who had no previous record as an activist, shot to fame in April after he posted a video of himself on Facebook venting against state corruption and the government's failure to provide basic services.
The demonstrations have revealed the long-bubbling frustration normally kept under strict control by Mugabe's ruthless security forces in a country where 90 percent of the population are not in formal jobs. Footage on the internet has shown police beating protesters with sticks.
"No violence, citizens. Whenever we protest: no violence, so we are pushing ahead Wednesday 13 and Thursday 14 July. We are pushing for a 'stay-away' (shutdown) because there is nothing else we can do for the government to listen to us," Mawarire said in a video message before his arrest.