Example of an Android gesture operation (up/down/left/right judgment) _android

The example of this article describes the Android gesture operation method. Share to everyone for your reference, specific as follows:

Android provides an interface for judging gestures, so we can implement a variety of gesture functions based on the API provided to improve the user experience of mobile apps.

Here is a small demo I wrote:

Gestureactivity.java

public class Gestureactivity extends activity {private Gesturedetector gesturedetector;
  private screen screens;
    @Override public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);
    Setcontentview (R.layout.main);
    Gesturedetector = new Gesturedetector (This,ongesturelistener);
  Get the size of screen = Gestureutils.getscreenpix (this);
  @Override public boolean ontouchevent (Motionevent event) {return gesturedetector.ontouchevent (event);
    } gesturedetector.ongesturelistener Ongesturelistener = new Gesturedetector.simpleongesturelistener () {@Override public boolean onfling (Motionevent E1, motionevent E2, float Velocityx, float velocityy) {float x = E2.get
      X ()-E1.getx ();
      Float y = e2.gety ()-e1.gety ();
      The limit must be 1/3 across the screen to calculate the float x_limit = SCREEN.WIDTHPIXELS/3;
      float y_limit = SCREEN.HEIGHTPIXELS/3;
      float X_abs = Math.Abs (x);
      float y_abs = Math.Abs (y); if (x_abs >= y_abs) {//gesture left or right if (x > X_limit | | | x <-X_LIMIT) {if (x>0) {
          Right show (' right ');
          }else if (x//left Show ("left"); 
            }}else{//gesture down or up if (Y > Y_limit | | | y <-y_limit) {if (y>0) {
          Down Show ("Down");
          }else if (Y//up show ("Up");
    }} return true;
  }
  };
  private void Show (String value) {Toast.maketext (this, value, Toast.length_short). Show ();

 }
}

Gestureutils.java

public class Gestureutils {
  //Get screen size public
  static Screens Getscreenpix (context context) {
    Displaymetrics DM = new Displaymetrics ();
    WindowManager WindowManager = (windowmanager) context.getsystemservice (context.window_service);
    Windowmanager.getdefaultdisplay (). Getmetrics (DM);
    Return to New screen (dm.widthpixels,dm.heightpixels);
  }
  public static class screen{public
    int widthpixels;
    public int heightpixels;
    Public screens () {
    } public screen
    (int widthpixels,int heightpixels) {
      this.widthpixels=widthpixels;
      this.heightpixels=heightpixels;
    }
    @Override public
    String toString () {return
      "(" +widthpixels+ "," +heightpixels+ ")" "
    ;
  }
}}

For more information on Android-related content readers can view the site topics: "Android File Operation tips Summary", "Android programming development of the SD card operation Summary", "Android Development introduction and Advanced Course", "Android Resources Operating Skills summary", " Android View tips Summary and a summary of the use of Android controls

I hope this article will help you with your Android programming.