Testing the Multitouch API : Touch « User Event « Android

1. Android
2. User Event
3. Touch

Testing the Multitouch API

   
package app.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.TextView;

public class Test extends Activity implements OnTouchListener {
  StringBuilder builder = new StringBuilder();
  TextView textView;
  float[] x = new float[10];
  float[] y = new float[10];
  boolean[] touched = new boolean[10];

  private void updateTextView() {
    builder.setLength(0);
    for (int i = 0; i < 10; i++) {
      builder.append(touched[i]);
      builder.append(", ");
      builder.append(x[i]);
      builder.append(", ");
      builder.append(y[i]);
      builder.append("\n");
    }
    textView.setText(builder.toString());
  }

  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    textView = new TextView(this);
    textView.setText("Touch and drag multiple fingers supported.");
    textView.setOnTouchListener(this);
    setContentView(textView);
  }

  @Override
  public boolean onTouch(View v, MotionEvent event) {
    int action = event.getAction() & MotionEvent.ACTION_MASK;
    int pointerIndex = (event.getAction() & MotionEvent.ACTION_POINTER_ID_MASK) >> MotionEvent.ACTION_POINTER_ID_SHIFT;
    int pointerId = event.getPointerId(pointerIndex);
    switch (action) {
    case MotionEvent.ACTION_DOWN:
    case MotionEvent.ACTION_POINTER_DOWN:
      touched[pointerId] = true;
      x[pointerId] = (int) event.getX(pointerIndex);
      y[pointerId] = (int) event.getY(pointerIndex);
      break;
    case MotionEvent.ACTION_UP:
    case MotionEvent.ACTION_POINTER_UP:
    case MotionEvent.ACTION_CANCEL:
      touched[pointerId] = false;
      x[pointerId] = (int) event.getX(pointerIndex);
      y[pointerId] = (int) event.getY(pointerIndex);
      break;
    case MotionEvent.ACTION_MOVE:
      int pointerCount = event.getPointerCount();
      for (int i = 0; i < pointerCount; i++) {
        pointerIndex = i;
        pointerId = event.getPointerId(pointerIndex);
        x[pointerId] = (int) event.getX(pointerIndex);
        y[pointerId] = (int) event.getY(pointerIndex);
      }
      break;
    }
    updateTextView();
    return true;
  }
}

   
    
    
  

Related examples in the same category