android 上下左右手势判断 根据别人的改的
16lz
2021-01-23
http://www.cnblogs.com/meieiem/archive/2011/09/16/2178313.html
GestureUtils.java
package com.gesture;import android.content.Context;import android.util.DisplayMetrics;import android.view.WindowManager;public class GestureUtils { //获取屏幕的大小 public static Screen getScreenPix(Context context) { DisplayMetrics dm = new DisplayMetrics(); WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); windowManager.getDefaultDisplay().getMetrics(dm); return new Screen(dm.widthPixels,dm.heightPixels); } public static class Screen{ public int widthPixels; public int heightPixels; public Screen(){ } public Screen(int widthPixels,int heightPixels){ this.widthPixels=widthPixels; this.heightPixels=heightPixels; } @Override public String toString() { return "("+widthPixels+","+heightPixels+")"; } } }
BuileGestureExt.java
package com.gesture;import com.gesture.GestureUtils.Screen;import android.content.Context;import android.view.GestureDetector;import android.view.MotionEvent;public class BuileGestureExt { public static final int GESTURE_UP=0; public static final int GESTURE_DOWN=1; public static final int GESTURE_LEFT=2; public static final int GESTURE_RIGHT=3; private OnGestureResult onGestureResult; private Context mContext; public BuileGestureExt(Context c,OnGestureResult onGestureResult) { this.mContext=c; this.onGestureResult=onGestureResult; screen = GestureUtils.getScreenPix(c); } public GestureDetector Buile() { return new GestureDetector(mContext, onGestureListener); } private Screen screen; private GestureDetector.OnGestureListener onGestureListener = new GestureDetector.SimpleOnGestureListener(){ @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { float x = e2.getX() - e1.getX(); float y = e2.getY() - e1.getY(); //限制必须得划过屏幕的1/4才能算划过 float x_limit = screen.widthPixels / 4; float y_limit = screen.heightPixels / 4; 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 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>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 interface 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(); } } |
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