Android Gesture Recognition (sliding left and right) enables page switching and android gestures

Android Gesture Recognition (sliding left and right) enables page switching and android gestures

</Pre> to achieve the effect of Sliding between the left and right of the page, the gesture reader must be the GestureDetector object. <P> </p> <p> the usage is actually very simple. It is easy to find it later. </P> <p> the procedure is 123 .. </P> <p> 1. initialize the gesture reader </p> <p> 2. register the touch event of gesture recognition. </P> <p>. The recognition gesture page can be switched in only two steps. </P> <p> because page switching is available in every activity, we put the initial registration of the gesture reader in baseactivity to make the most effective use of our code.. </P> <pre code_snippet_id = "673269" snippet_file_name = "blog_20150523_2_2749063" name = "code" class = "java"> package com. example. gesturedemo; import android. app. activity; import android. OS. bundle; import android. view. gestureDetector; import android. view. view; import android. view. motionEvent; public abstract class BaseActivity extends Activity {private GestureDetector mGestureDetector; @ Overrideprotected void onCreate (Bundle savedInstanceState) {// TODO Auto-generated method stubsuper. onCreate (savedInstanceState); // 1 initialize mGestureDetector = new GestureDetector (this, new GestureDetector. simpleOnGestureListener () {@ Overridepublic boolean onFling (MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {// e1: position 1 pressed e2 position when the hand leaves the screen position velocityX speed along the x axis velocityY: speed along the Y axis // determine the size of moving vertically if (Math. abs (e1.getRawY ()-e2.getRawY ()> 100) {// Toast. makeText (getApplicationContext (), "The action is invalid", 0 ). show (); return true;} if (Math. abs (velocityX) <150) {// Toast. makeText (getApplicationContext (), "moving too slowly", 0 ). show (); return true;} if (e1.getRawX ()-e2.getRawX ()> 200) {// slide to the right to display next page next (null ); return true;} if (e2.getRawX ()-e1.getRawX ()> 200) {// slide to the left to indicate the previous page // display the previous page pre (null); return true; // consume the current event to prevent the current event from being passed down} return super. onFling (e1, e2, velocityX, velocityY) ;}});}/*** next page * @ param view */public abstract void next (View view ); /*** Previous Page ** @ param view */public abstract void pre (View view); // rewrite the activity's touch event @ Overridepublic boolean onTouchEvent (MotionEvent event) {// 2. enable the gesture reader to take effect of mGestureDetector. onTouchEvent (event); return super. onTouchEvent (event );}}

Then let each specific interface inherit the baseactivity and implement the corresponding next or pre method. To display the effects, we define several animated effects: left-to-right or right-to-left. For more information, see the demo.

It's really easy (click to download)