Android OnGestureListener用法识别用户手势左右滑动

Android手势识别实践

最新推荐文章于 2022-03-01 20:01:48 发布

原创最新推荐文章于 2022-03-01 20:01:48 发布 · 3.2w 阅读

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文章标签：

#android #velocity #distance #layout #float #encoding

本文介绍如何在Android应用中实现手势识别功能，通过使用OnGestureListener监听用户的不同手势，并作出响应处理，例如页面翻动等。文章提供了具体实现代码示例。

android可以识别用户的手势（即用户用手指滑动的方向），通过用户不同的手势，从而做出不同的处理

需要使用OnGestureListener

比如说看电子书的时候翻页，或者要滑动一些其他内容

直接上代码

界面文件

main.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/ll" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> </LinearLayout>

主Activity

package zy.lucifer.testGesture; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.GestureDetector; import android.view.MotionEvent; import android.view.View; import android.view.GestureDetector.OnGestureListener; import android.view.View.OnTouchListener; import android.widget.LinearLayout; import android.widget.TextView; import android.widget.Toast; public class testGesture extends Activity implements OnTouchListener, OnGestureListener { GestureDetector mGestureDetector; private static final int FLING_MIN_DISTANCE = 50; private static final int FLING_MIN_VELOCITY = 0; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mGestureDetector = new GestureDetector(this); LinearLayout ll=(LinearLayout)findViewById(R.id.ll); ll.setOnTouchListener(this); ll.setLongClickable(true); } @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub Log.i("touch","touch"); return mGestureDetector.onTouchEvent(event); } @Override public boolean onDown(MotionEvent e) { // TODO Auto-generated method stub return false; } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { // TODO Auto-generated method stub if (e1.getX()-e2.getX() > FLING_MIN_DISTANCE && Math.abs(velocityX) > FLING_MIN_VELOCITY) { // Fling left Toast.makeText(this, "向左手势", Toast.LENGTH_SHORT).show(); } else if (e2.getX()-e1.getX() > FLING_MIN_DISTANCE && Math.abs(velocityX) > FLING_MIN_VELOCITY) { // Fling right Toast.makeText(this, "向右手势", Toast.LENGTH_SHORT).show(); } return false; } @Override public void onLongPress(MotionEvent e) { // TODO Auto-generated method stub } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { // TODO Auto-generated method stub return false; } @Override public void onShowPress(MotionEvent e) { // TODO Auto-generated method stub } @Override public boolean onSingleTapUp(MotionEvent e) { // TODO Auto-generated method stub return false; } }