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Thursday, November 17, 2011

Using GestureDetector with SimpleOnGestureListener

GestureDetector.SimpleOnGestureListener is a convenience class to extend when you only want to listen for a subset of all the gestures.

Using GestureDetector with SimpleOnGestureListener

package com.exercise.AndroidSimpleGesture;

import android.app.Activity;
import android.os.Bundle;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.widget.TextView;

public class AndroidSimpleGestureActivity extends Activity {

TextView gestureEvent;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
gestureEvent = (TextView)findViewById(R.id.GestureEvent);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
return gestureDetector.onTouchEvent(event);
}

SimpleOnGestureListener simpleOnGestureListener
= new SimpleOnGestureListener(){

@Override
public boolean onDoubleTap(MotionEvent e) {
// TODO Auto-generated method stub
gestureEvent.setText("onDoubleTap: \n" + e.toString());
return super.onDoubleTap(e);
}

@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
// TODO Auto-generated method stub
gestureEvent.setText("onFling: \n" + e1.toString() + "\n" + e2.toString() +"\n"
+ "velocityX= " + String.valueOf(velocityX) + "\n"
+ "velocityY= " + String.valueOf(velocityY) + "\n");
return super.onFling(e1, e2, velocityX, velocityY);
}

@Override
public void onLongPress(MotionEvent e) {
// TODO Auto-generated method stub
gestureEvent.setText("onLongPress: \n" + e.toString());
super.onLongPress(e);
}

@Override
public boolean onSingleTapConfirmed(MotionEvent e) {
// TODO Auto-generated method stub
gestureEvent.setText("onSingleTapConfirmed: \n" + e.toString());
return super.onSingleTapConfirmed(e);
}

};

GestureDetector gestureDetector
= new GestureDetector(simpleOnGestureListener);
}


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />

<TextView
android:id="@+id/GestureEvent"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />

</LinearLayout>


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next:
- Detect swipe using SimpleOnGestureListener



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