package com.lidaochen.test;

import android.os.Bundle;

import android.os.Handler;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.widget.TextView;

import android.widget.Toast;

import java.io.File;

import java.io.FileOutputStream;

import java.util.Timer;

import java.util.TimerTask;

public class MainActivity extends AppCompatActivity {

    private Timer timer;

    private TimerTask timerTask;

    private TextView tv;

    public static int num;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        // 获取TextView控件

        tv = (TextView)findViewById(R.id.tv);

        num = 0;

        // 5秒钟后执run方法

        new Handler().postDelayed(new Runnable() {

            @Override

            public void run() {

                tv.setText("我是你爷爷！");

                Toast.makeText(getApplicationContext(), "我是你爸爸！", Toast.LENGTH_LONG).show();

            }

        }, 5000);

        timer = new Timer();

        timerTask = new TimerTask() {

            @Override

            public void run() {

                num++;

                runOnUiThread(new Runnable() {

                    @Override

                    public void run() {

                        tv.setText("呵呵呵！" + num);

                    }

                });

            }

        };

        // 3 秒后每隔一秒钟执行一次run方法

        timer.schedule(timerTask, 3000, 1000);

    }

    @Override

    // 当Activity销毁的时候会执行这个方法

    protected void onDestroy() {

        timer.cancel();

        timerTask.cancel();

        super.onDestroy();

    }

}