private final static int CAMERA_RQ = 6969;
File saveFolder = new File(Environment.getExternalStorageDirectory(), "MaterialCamera Sample");
 if (!saveFolder.mkdirs())
  throw new RuntimeException("Unable to create save directory, make sure WRITE_EXTERNAL_STORAGE permission is granted.");
  new MaterialCamera(this)

 // Constructor takes an Activity
  .allowRetry(true)

 // Whether or not 'Retry' is visible during playback
  .autoSubmit(false)

// Whether or not user is allowed to playback videos after recording. This can affect other things, discussed in the next section.
  .saveDir(saveFolder)

 // The folder recorded videos are saved to
  .primaryColorAttr(R.attr.colorPrimary)

 // The theme color used for the camera, defaults to colorPrimary of Activity in the constructor
  .showPortraitWarning(true)

 // Whether or not a warning is displayed if the user presses record in portrait orientation
  .defaultToFrontFacing(false)

  // Whether or not the camera will initially show the front facing camera
  .allowChangeCamera(true)

// Allows the user to change cameras. 
  .retryExits(false)

// If true, the 'Retry' button in the playback screen will exit the camera instead of going back to the recorder
  .restartTimerOnRetry(false)

// If true, the countdown timer is reset to 0 when the user taps 'Retry' in playback
  .continueTimerInPlayback(false)

  // If true, the countdown timer will continue to go down during playback, rather than pausing.
  .videoEncodingBitRate(1024000)

// Sets a custom bit rate for video recording.
  .audioEncodingBitRate(50000)

  // Sets a custom bit rate for audio recording.
  .videoFrameRate(24)

  // Sets a custom frame rate (FPS) for video recording.
  .qualityProfile(MaterialCamera.QUALITY_HIGH)

 // Sets a quality profile, manually setting bit rates or frame rates with other settings will overwrite individual quality profile settings
  .videoPreferredHeight(720)

 // Sets a preferred height for the recorded video output.
  .videoPreferredAspect(4f / 3f)

// Sets a preferred aspect ratio for the recorded video output.
  .maxAllowedFileSize(1024 * 1024 * 5)

// Sets a max file size of 5MB, recording will stop if file reaches this limit. Keep in mind, the FAT file system has a file size limit of 4GB.
  .iconRecord(R.drawable.mcam_action_capture)

  // Sets a custom icon for the button used to start recording
  .iconStop(R.drawable.mcam_action_stop)

 // Sets a custom icon for the button used to stop recording
  .iconFrontCamera(R.drawable.mcam_camera_front)
  // Sets a custom icon for the button used to switch to the front camera
  .iconRearCamera(R.drawable.mcam_camera_rear)

 // Sets a custom icon for the button used to switch to the rear camera
  .iconPlay(R.drawable.evp_action_play)

  // Sets a custom icon used to start playback
  .iconPause(R.drawable.evp_action_pause)

// Sets a custom icon used to pause playback
  .iconRestart(R.drawable.evp_action_restart)

  // Sets a custom icon used to restart playback
  .labelRetry(R.string.mcam_retry)

 // Sets a custom button label for the button used to retry recording, when available
  .labelConfirm(R.string.mcam_use_video)

 // Sets a custom button label for the button used to confirm/submit a recording
  .autoRecordWithDelaySec(5)

 // The video camera will start recording automatically after a 5 second countdown. This disables switching between the front and back camera initially.
  .autoRecordWithDelayMs(5000)

  // Same as the above, expressed with milliseconds instead of seconds.
  .audioDisabled(false)

// Set to true to record video without any audio.
  .start(CAMERA_RQ);

// Starts the camera activity, the result will be sent back to the current Activity

new MaterialCamera(this)
  .countdownMinutes(2.5f)
  .start(CAMERA_RQ);

new MaterialCamera(this)
  .countdownMinutes(2.5f)
  .countdownImmediately(true)
  .start(CAMERA_RQ);

new MaterialCamera(this)
  /** all the previous methods can be called, but video ones would be ignored */
  .stillShot() // launches the Camera in stillshot mode
  .start(CAMERA_RQ);

public class MainActivity extends AppCompatActivity {

private final static int CAMERA_RQ = 6969;

@Override
  protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

new MaterialCamera(this)

 .start(CAMERA_RQ);

  
}

@Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {

super.onActivityResult(requestCode, resultCode, data);

 // Received recording or error from MaterialCamera

if (requestCode == CAMERA_RQ) {

 if (resultCode == RESULT_OK) {

  Toast.makeText(this, "Saved to: " + data.getDataString(), Toast.LENGTH_LONG).show();

 
}
 else if(data != null) {

  Exception e = (Exception) data.getSerializableExtra(MaterialCamera.ERROR_EXTRA);

  e.printStackTrace();

  Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();

 
}

}

  
}
 
}