Android GestureDetector Application

Code: [java] import android. app. activity; import android. OS. bundle; import android. util. log; import android. view. gestureDetector; import android. view. gestureDetector. onGestureListener; import android. view. motionEvent; import android. view. view; import android. view. view. onTouchListener; import android. widget. textView; import android. widget. toast; public class GestureActivity extends Activity implements OnTouchListener, OnGestureListener {includetector; public GestureActivity () {detector = new role (this);} public void onCreate (Bundle savedInstanceState. onCreate (savedInstanceState); setContentView (R. layout. main); TextView TV = (TextView) findViewById (R. id. textView001); // set the TV ****** TV. setOnTouchListener (this); TV. setFocusable (true); // required. view can process hold TV different from Tap. setClickable (true); TV. setLongClickable (true); detector. setIsLongpressEnabled (true);}/** in the onTouch () method, we call the onTouchEvent () method of GestureDetector, assign the captured MotionEvent to GestureDetector * to analyze whether there is an appropriate callback function to process the user's gesture */public boolean onTouch (View v, MotionEvent event) {return detector. onTouchEvent (event);} // you can touch the touch screen. One MotionEvent ACTION_DOWN triggers public boolean onDown (MotionEvent arg0) {Log. I ("MyGesture", "onDown"); Toast. makeText (this, "onDown", Toast. LENGTH_SHORT ). show (); return true;}/** when you touch the touch screen, you have not released or dragged it. It is triggered by one MotionEvent ACTION_DOWN * note the difference between it and onDown, it is emphasized that the status is not released or dragged */public void onShowPress (MotionEvent e) {Log. I ("MyGesture", "onShowPress"); Toast. makeText (this, "onShowPress", Toast. LENGTH_SHORT ). show ();} // the user (after touching the touch screen) is released. One MotionEvent ACTION_UP triggers public boolean onSingleTapUp (MotionEvent e) {Log. I ("MyGesture", "onSingleTapUp"); Toast. makeText (this, "onSingleTapUp", Toast. LENGTH_SHORT ). show (); return true;} // The user presses the touch screen and moves quickly. One MotionEvent ACTION_DOWN, multiple ACTION_MOVE, and one ACTION_UP triggers public boolean onFling (MotionEvent e1, motionEvent e2, float velocityX, float velocityY) {Log. I ("MyGesture", "onFling"); // parameter explanation: // e1: 1st ACTION_DOWN MotionEvent // e2: The last ACTION_MOVE MotionEvent // velocityX: moving speed on the X axis, pixel/second // velocityY: moving speed on the Y axis, pixel/second // trigger condition: // coordinate displacement of the X axis is greater than FLING_MIN_DISTANCE, the moving speed is greater than FLING_MIN_VELOCITY pixels/Second final int FLING_MIN_DISTANCE = 100, FLING_MIN_VELOCITY = 200; if (e1.getX ()-e2.getX ()> FLING_MIN_DISTANCE & Math. abs (velocityX)> FLING_MIN_VELOCITY) {// Fling left Log. I ("MyGesture", "Fling left"); Toast. makeText (this, "Fling Left", Toast. LENGTH_SHORT ). show ();} else if (e2.getX ()-e1.getX ()> FLING_MIN_DISTANCE & Math. abs (velocityX)> FLING_MIN_VELOCITY) {// Fling right Log. I ("MyGesture", "Fling right"); Toast. makeText (this, "Fling Right", Toast. LENGTH_SHORT ). show ();} else if (e2.getY ()-e1.getY ()> FLING_MIN_DISTANCE & Math. abs (velocityY)> FLING_MIN_VELOCITY) {// Fling down Log. I ("MyGesture", "Fling down"); Toast. makeText (this, "Fling down", Toast. LENGTH_SHORT ). show ();} else if (e1.getY ()-e2.getY ()> FLING_MIN_DISTANCE & Math. abs (velocityY)> FLING_MIN_VELOCITY) {// Fling up Log. I ("MyGesture", "Fling up"); Toast. makeText (this, "Fling up", Toast. LENGTH_SHORT ). show ();} return false;} // press the touch screen and drag it. One MotionEvent ACTION_DOWN and multiple ACTION_MOVE triggers public boolean onScroll (MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {Log. I ("MyGesture", "onScroll"); Toast. makeText (this, "onScroll", Toast. LENGTH_LONG ). show (); return true;} // press the touch screen to trigger public void onLongPress (MotionEvent e) {Log. I ("MyGesture", "onLongPress"); Toast. makeText (this, "onLongPress", Toast. LENGTH_LONG ). show ();}}