How to move an ImageView along X and Y axis with Sensor Accelerometer Data

Question

I have an oversized image that I want to move up, down, left and right, using the Accelerometer values. I have created the following code that works, but the image moves in distinct steps and does not slide smoothly.

float[] matrix = new float[9];
mMatrix.getValues(matrix);

if (accelerometerValues[0] < MOVE_RIGHT_LIMIT) {

 mMatrix.setTranslate(matrix[2] + 10, matrix[5] );
 mSchematicDiagram.setImageMatrix(mMatrix);

 Log.d("PROJECTA_SENSOR", "Moving Right");

Is it correct to use the setTranslate on ImageView matrix for this sort of use case and how would you create this smooth transition ?

Answer 1

i'm not sure what kind of image you want to move and why using matrix, but if you have an ImageView, you can do it by setting X and Y values in onSensorChanged method

 @Override
public void onSensorChanged(SensorEvent event) {

    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {

        x -= (int) event.values[0];
        y += (int) event.values[1];

        yourImageView.setY(y);
        yourImageView.setX(x);

    }
}

Here is my MainActivity code that works well (I just need to add borders, because currently the image can move out of the screen borders), probably it will help somebody.

import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.ImageView;


public class MainActivity extends Activity implements SensorEventListener{

    private SensorManager sensorManager;
    private Sensor accelerometer;
    private long lastUpdate;

    ImageView mDrawable;
    public static int x = 0;
    public static int y = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mDrawable = (ImageView) findViewById(R.id.image);
        sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        lastUpdate = System.currentTimeMillis();

    }

    @Override
    protected void onResume() {
        super.onResume();
        sensorManager.registerListener(this, accelerometer,
                SensorManager.SENSOR_DELAY_GAME);
    }

    @Override
    protected void onPause() {
        super.onPause();
        sensorManager.unregisterListener(this);
    }


    @Override
    public void onSensorChanged(SensorEvent event) {

        if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {

            x -= (int) event.values[0];
            y += (int) event.values[1];

            mDrawable.setY(y);
            mDrawable.setX(x);

        }
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {

    }
}