<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <!-- 定义TextView文本标签 -->
    <TextView
        android:id="@+id/Tv"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="点击屏幕得到相对屏幕的位置"
        />

</RelativeLayout>

package com.example.yanlei.yl;

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.text.Html;
import android.text.Html.ImageGetter;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import android.widget.Button;


import android.app.Activity;
import android.content.Intent;

import android.view.MotionEvent;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    //定义TextView对象
    private TextView Tv;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //得到浏览器中的控件对象
        findView();

   }
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        //当按下屏幕的时候，获取点击位置的x，y
        if (MotionEvent.ACTION_DOWN == event.getAction()) {
            float x = event.getX();
            float y = event.getY();

            Tv.setText("您点击的位置是：\nx:"+x+"\n y:"+y);
        }

        return super.onTouchEvent(event);
    }

    private void findView() {
        // 得到当前布局的控件对象
        Tv = (TextView)findViewById(R.id.Tv);
    }

}