package com.example.activityOnTouchEvent;

import android.app.Activity;

import android.os.Bundle;

import android.view.MotionEvent;

import android.widget.Toast;

public class MyActivity extends Activity {

    //手指按下的点为(x1, y1)手指离开屏幕的点为(x2, y2)

    float x1 = 0;

    float x2 = 0;

    float y1 = 0;

    float y2 = 0;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

    }

    @Override

    public boolean onTouchEvent(MotionEvent event) {

        //继承了Activity的onTouchEvent方法，直接监听点击事件

        if(event.getAction() == MotionEvent.ACTION_DOWN) {

            //当手指按下的时候

            x1 = event.getX();

            y1 = event.getY();

        }

        if(event.getAction() == MotionEvent.ACTION_UP) {

            //当手指离开的时候

            x2 = event.getX();

            y2 = event.getY();

            if(y1 - y2 > 50) {

                Toast.makeText(MyActivity.this, "向上滑", Toast.LENGTH_SHORT).show();

            } else if(y2 - y1 > 50) {

                Toast.makeText(MyActivity.this, "向下滑", Toast.LENGTH_SHORT).show();

            } else if(x1 - x2 > 50) {

                Toast.makeText(MyActivity.this, "向左滑", Toast.LENGTH_SHORT).show();

            } else if(x2 - x1 > 50) {

                Toast.makeText(MyActivity.this, "向右滑", Toast.LENGTH_SHORT).show();

            }

        }

        return super.onTouchEvent(event);

    }

}