That looks like code designed for Eclipse. To make it work in Processing, you'll need to change a couple of things... In theory, the code below should work...

1. import android.hardware.Sensor;
2. import android.hardware.SensorEvent;
3. import android.hardware.SensorEventListener;
4. import android.hardware.SensorManager;
5. import android.os.Bundle;
6. import android.widget.TextView;
7. 
   
8. TextView result;
9. SensorManager sensorManager;
10. Sensor sensor;
11. float x, y, z;
12. 
    
13. @Override
14. public void onCreate(Bundle savedInstanceState) {
15.   super.onCreate(savedInstanceState);
16.  
    
17.   sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
18.   sensor = sensorManager.getSensorList(Sensor.TYPE_ACCELEROMETER).get(0);
19. }
20. 
    
21. void refreshDisplay() {
22.   String output = String.format("x is: %f / y is: %f / z is: %f", x, y, z);
23.   result.setText(output);
24. }
25. 
    
26. @Override
27. void onResume() {
28.   super.onResume();
29.   sensorManager.registerListener(accelerationListener, sensor, SensorManager.SENSOR_DELAY_GAME);
30. }
31. 
    
32. @Override
33. void onStop() {
34.   sensorManager.unregisterListener(accelerationListener);
35.   super.onStop();
36. }
37.  
38. SensorEventListener accelerationListener = new SensorEventListener() {
39.   @Override
40.   public void onAccuracyChanged(Sensor sensor, int acc) {}
41.  
    
42.   @Override
43.   public void onSensorChanged(SensorEvent event) {
44.     x = event.values[0];
45.     y = event.values[1];
46.     z = event.values[2];
47.     text(x,10,10,10);
48.     refreshDisplay();
49.   }};
50. }
51. 
    
52. void setup() {
53.   size(480, 480);
54. }
55. 
    
56. void draw() {
57.   text(x,10,10,10); //this sould be the x variable writen on the display
58. }