android 上下左右手势判断根据别人的改的

迈不过友情╰ 2022-06-09 03:29 119阅读 0赞

原文地址:[http://www.cnblogs.com/meieiem/archive/2011/09/16/2178313.html][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();     }         }

[http_www.cnblogs.com_meieiem_archive_2011_09_16_2178313.html]: http://www.cnblogs.com/meieiem/archive/2011/09/16/2178313.html