How much motion is needed to trigger Significant Motion

Question

Tested the Significant Motion sample on android.googlesource.com to learn more on this Trigger sensor. Unfortunately the sensor does not trigger. What do I do wrong?

code snipes

class TriggerListener extends TriggerEventListener {
    private Context mContext;
    private TextView mTextView;

    TriggerListener(Context context, TextView textView) {
        mContext = context;
        mTextView = textView;
    }

    @Override
    public void onTrigger(TriggerEvent event) {
        if (event.values[0] == 1) {
            mTextView.append(mContext.getString(R.string.sig_motion) + "\n");
            mTextView.append(mContext.getString(R.string.sig_motion_auto_disabled) + "\n");
        }
    }
}

public class MainActivity extends AppCompatActivity {
    private SensorManager mSensorManager;
    private Sensor mSigMotion;
    private TriggerListener mListener;
    private TextView mTextView;

    @Override
    protected void onPause() {
        super.onPause();
        if (mSigMotion != null) mSensorManager.cancelTriggerSensor(mListener, mSigMotion);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
        mSigMotion = mSensorManager.getDefaultSensor(Sensor.TYPE_SIGNIFICANT_MOTION);
        mTextView = (TextView)findViewById(R.id.text);
        mListener = new TriggerListener(this, mTextView);
        if (mSigMotion == null) {
            mTextView.append(getString(R.string.no_sig_motion) + "\n");
        }
    }

thanks for your help.

score 0 · Answer 1 · answered Aug 15 '18 at 10:36

I was having same problem and I found

mSensorManager.getDefaultSensor(Sensor.TYPE_SIGNIFICANT_MOTION);

returned null. So maybe there is no Significant Motion Sensor in the device(or the virtual device). In following code from the sample

@Override
protected void onResume() {
    super.onResume();
    if (mSigMotion != null && mSensorManager.requestTriggerSensor(mListener, mSigMotion))
        mTextView.append(getString(R.string.sig_motion_enabled) + "\n");
 }

mSensorManager.requestTriggerSensor(mListener, mSigMotion)) is never executed.

@AI117 thanks for your reply, In the code above, from android.googlesource.com, there should always be a comment in the mTextView, even if there is no Significant Motion Sensor. but I got no comment when running that code. — Frits Molenkamp, Aug 19 '18 at 16:34

How much motion is needed to trigger Significant Motion

1 Answers1