Android up and down gesture judging according to other people's changes

Gestureutils.java

PackageCom.gesture;

ImportAndroid.content.Context;
ImportAndroid.util.DisplayMetrics;
ImportAndroid.view.WindowManager;

Public Classgestureutils {

 

 //Get the size of the screen
 Public StaticScreen Getscreenpix (context context) {
Displaymetrics DM= NewDisplaymetrics ();
WindowManager WindowManager=(WindowManager) Context.getsystemservice (Context.window_service);
Windowmanager.getdefaultdisplay (). Getmetrics (DM);
 Return NewScreen (dm.widthpixels,dm.heightpixels);
}
 
 Public Static Classscreen{
 
 Public IntWidthpixels;
 Public IntHeightpixels;
 
 PublicScreen () {
 
}
 
 PublicScreen (IntWidthpixels,IntHeightpixels) {
 This. widthpixels=Widthpixels;
 This. heightpixels=heightpixels; 
} 
 
 @Override 
 public String toString () {
 Span style= "color: #0000ff;" >return  ( "+widthpixels+ "," +heightpixels+) Span style= "color: #000000;" > "; 
} 
 
} 
 
}              /span>        

Builegestureext.java

PackageCom.gesture;

ImportCom.gesture.GestureUtils.Screen;

ImportAndroid.content.Context;
ImportAndroid.view.GestureDetector;
ImportAndroid.view.MotionEvent;

Public ClassBuilegestureext {
 Public Static Final IntGesture_up=0;
 Public Static Final IntGesture_down=1;
 Public Static Final IntGesture_left=2;
 Public Static Final IntGesture_right=3;
 PrivateOngestureresult Ongestureresult;
 PrivateContext Mcontext;
 PublicBuilegestureext (Context c,ongestureresult ongestureresult) {
 This. mcontext=C
 This. ongestureresult=Ongestureresult;
Screen=Gestureutils.getscreenpix (c);
}
 PublicGesturedetector Buile ()
{
 Return NewGesturedetector (Mcontext, Ongesturelistener);
}
 
 PrivateScreen screen;
 PrivateGesturedetector.ongesturelistener Ongesturelistener= NewGesturedetector.simpleongesturelistener () {

@Override
 Public BooleanOnfling (motionevent E1, motionevent E2,FloatVelocityx,
 FloatVELOCITYY) {
 FloatX=E2.getx ()-E1.getx ();
 FloatY=E2.gety ()-E1.gety ();
 //The limit must be 1/4 across the screen to be counted.
 FloatX_limit=Screen.widthpixels/ 4;
 FloatY_limit=Screen.heightpixels/ 4;
 FloatX_abs=Math.Abs (x);
 FloatY_abs=Math.Abs (y);
 If(X_abs>=Y_abs) {
 //Gesture left or right
 If(x>X_limit||X< -X_limit) {
 If(x>0){
 //Right
Doresult (Gesture_right);
}Else If(x<=0){
 //Left
Doresult (Gesture_left);
}
}
}Else{
 //Gesture down or up
 If (y > Y_limit ||  y < -y_limit) {
 if (y< Span style= "color: #000000;" >>0 //down Doresult (Gesture_down);} else if (y<=0) {//up doresult (gesture_up);}} } return true; } }; public void Doresult (int result) {if (ongestureresult!=null) {Ongestureresult.ongestureresult (Result),}} public Interf Ace Ongestureresult {public void ongestureresult (int direction);}        

Demo

package com.gesture; import android.app.Activity; import android.os.Bundle; import android.view.GestureDetector; import android.view.MotionEvent; import android.widget.Toast; public class GesturetestActivity extends Activity {      /** Called when the activity is first created. */      private GestureDetector gestureDetector;       @Override      public void onCreate(Bundle savedInstanceState) {          super .onCreate(savedInstanceState);          setContentView(R.layout.main);          gestureDetector = new BuileGestureExt( this , new BuileGestureExt.OnGestureResult() {              @Override              public void onGestureResult( int direction) {                  show(Integer.toString(direction));              }          }          ).Buile();      }      @Override      public boolean onTouchEvent(MotionEvent event) {          return gestureDetector.onTouchEvent(event);      }      private void show(String value){          Toast.makeText( this , value, Toast.LENGTH_SHORT).show();      }      }