<key>NSMicrophoneUsageDescription</key>
<string>Can We Use Your Microphone Please</string>

    ...
    </application>
    <uses-permission android:name="android.permission.RECORD_AUDIO"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    ...
</manifest>

bool hasPermission = await FlutterAudioRecorder.hasPermissions;

var recorder = FlutterAudioRecorder("file_path.mp4"); // .wav .aac .m4a
await recorder.initialized;

var recorder = FlutterAudioRecorder("file_path", audioFormat: AudioFormat.AAC); // or AudioFormat.WAV
await recorder.initialized;

var recorder = FlutterAudioRecorder("file_path", audioFormat: AudioFormat.AAC, sampleRate: 22000); // sampleRate is 16000 by default
await recorder.initialized;

await recorder.start();
var recording = await recorder.current(channel: 0);

var current = await recording.current(channel: 0);
// print(current.status);

new Timer.periodic(tick, (Timer t) async {
        var current = await recording.current(channel: 0);
        // print(current.status);
        setState(() {
        });
      });

await recorder.pause();

await recorder.resume();

var result = await recorder.stop();
File file = widget.localFileSystem.file(result.path);