SlideOnTouch.java :  » Samples » localservice » com » sample » slide » Android Open Source

package com.sample.slide;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ViewFlipper;

public class SlideOnTouch extends Activity {
  private static final int SWIPE_MIN_DISTANCE = 120;
  private static final int SWIPE_MAX_OFF_PATH = 250;
  private static final int SWIPE_THRESHOLD_VELOCITY = 200;
  private GestureDetector gestureDetector;
  View.OnTouchListener gestureListener;
  ViewFlipper viewFlipper;
  private Animation slideLeftIn;
  private Animation slideLeftOut;
  private Animation slideRightIn;
  private Animation slideRightOut;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    setUp();
  }

  private void setUp() {
    viewFlipper = (ViewFlipper) findViewById(R.id.ViewFlipper01);
    slideLeftIn = AnimationUtils.loadAnimation(this, R.anim.slide_left_in);
    slideLeftOut = AnimationUtils
        .loadAnimation(this, R.anim.slide_left_out);
    slideRightIn = AnimationUtils
        .loadAnimation(this, R.anim.slide_right_in);
    slideRightOut = AnimationUtils.loadAnimation(this,
        R.anim.slide_right_out);
    gestureDetector = new GestureDetector(new MyGestureDetector());
    gestureListener = new View.OnTouchListener() {
      public boolean onTouch(View v, MotionEvent event) {
        if (gestureDetector.onTouchEvent(event)) {
          return true;
        }
        return false;
      }
    };
    LayoutInflater inflater = null;
    inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View v1 = inflater.inflate(R.layout.view1, null);
    View v2 = inflater.inflate(R.layout.view2, null);
    viewFlipper.addView(v1,0);
    viewFlipper.addView(v2,1);
  }

  class MyGestureDetector extends SimpleOnGestureListener {
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
        float velocityY) {
      try {
        if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
          return false;
        // right to left swipe
        if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE
            && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
          viewFlipper.setInAnimation(slideLeftIn);
          viewFlipper.setOutAnimation(slideLeftOut);
          viewFlipper.showNext();
        } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE
            && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
          viewFlipper.setInAnimation(slideRightIn);
          viewFlipper.setOutAnimation(slideRightOut);
          viewFlipper.showPrevious();
        }
      } catch (Exception e) {
        // nothing
      }
      return false;
    }
  }

  @Override
  public boolean onTouchEvent(MotionEvent event) {
    if (gestureDetector.onTouchEvent(event))
      return true;
    else
      return false;
  }
}