<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="youli.com.example.administrator.myapplication.MainActivity">

    <Button
        android:id="@+id/start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="开始" />

    <Button
        android:id="@+id/cancel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="取消" />


</LinearLayout>

package youli.com.example.administrator.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.sql.Time;
import java.util.Timer;
import java.util.TimerTask;

public class MainActivity extends AppCompatActivity {

    private Button btn1, btn2;
    private Timer timer=null;
    private TimerTask timerTask=null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initview();
    }

    private void initview() {
        btn1 = findViewById(R.id.start);
        btn2 = findViewById(R.id.cancel);
        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if ( timer==null )
                    timer=new Timer();

                timerTask = new TimerTask() {
                    @Override
                    public void run() {

                        Toast.makeText(MainActivity.this, "执行", Toast.LENGTH_SHORT).show();
                        Log.e("TAG","执行");
                    }
                };

                timer.schedule(timerTask, 1000*10);

            }
        });



        btn2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if (timer != null) {
                    timer.cancel();
                    timer = null;
                }

                if (timerTask != null) {
                    timerTask.cancel();
                    timerTask = null;
                }

            }
        });

    }
}