Android Open Source - android-multitouch-close Main Activity

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License

The source code is released under:

MIT License

Java Source Code

package npi.multitouchclose;
//  www.j av  a2  s. c o m
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.graphics.PointF;

public class MainActivity extends ActionBarActivity {
  private Set<Integer> activePointers;
  private Map<Integer, PointF> pointersPositions;
  private enum GestureDetectionState {
    CAPTURING, DETECTED, IDLE
  }
  
  private GestureDetectionState gds;
  
  MainActivity() {
    super();
    this.activePointers = new TreeSet<Integer>();
    this.pointersPositions = new HashMap<Integer, PointF>();
    this.gds = GestureDetectionState.IDLE;
  }

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

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
      return true;
    }
    return super.onOptionsItemSelected(item);
  }
  
    @Override
    public boolean onTouchEvent(MotionEvent ev) {
      final int action = ev.getAction();
      
        switch (action & MotionEvent.ACTION_MASK) {
          case MotionEvent.ACTION_DOWN: {
            final int pointerId = ev.getPointerId(0);
            this.pointersPositions.put(pointerId, new PointF(ev.getX(), ev.getY()));
            this.activePointers.add(pointerId);
            break;
          }
          case MotionEvent.ACTION_POINTER_DOWN: {
              final int pointerIndex = (action & MotionEvent.ACTION_POINTER_INDEX_MASK) 
                      >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
                final int pointerId = ev.getPointerId(pointerIndex);
                this.pointersPositions.put(pointerId, new PointF(ev.getX(), ev.getY()));
                
            if (this.pointersPositions.size() <= 3) {
              this.activePointers.add(pointerId);
              
              if (this.pointersPositions.size() == 3) {
                this.gds = GestureDetectionState.CAPTURING;
              }
            } else {
              this.gds = GestureDetectionState.IDLE;
            }
            break;
          }
          case MotionEvent.ACTION_UP: {
              final int pointerIndex = (action & MotionEvent.ACTION_POINTER_INDEX_MASK) 
                      >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
            final int pointerId = ev.getPointerId(pointerIndex);
            this.pointersPositions.remove(pointerId);
            this.activePointers.remove(pointerId);
            break;
          }
          case MotionEvent.ACTION_POINTER_UP: {
              final int pointerIndex = (action & MotionEvent.ACTION_POINTER_INDEX_MASK) 
                      >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
            final int pointerId = ev.getPointerId(pointerIndex);
            this.pointersPositions.remove(pointerId);
            this.activePointers.remove(pointerId);
            
            if (this.activePointers.contains(pointerId)) {
              if (this.pointersPositions.size() < 3)
              {
                this.gds = GestureDetectionState.IDLE;
              } else {
                for (Integer i : this.pointersPositions.keySet()) {
                  if (!this.activePointers.contains(i)) {
                    this.activePointers.add(i);
                    break;
                  }
                }
              }
            }
            break;
          }
          case MotionEvent.ACTION_MOVE: {
              break;
          }
          case MotionEvent.ACTION_CANCEL: {
            break;
          }
        }
        return true;
    }  
}

Java Source Code List

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