android 上下左右手势判断 根据别人的改的

GestureUtils.java

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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+")";
}

}

}
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  BuileGestureExt.java

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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); }}
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  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();
    }
 
     
}
posted @ 2014-07-29 14:16  新感觉  阅读(968)  评论(0编辑  收藏  举报