如何让我的Andr​​oid应用程序，它做点什么每隔X秒 [英] How do i make Android app which do something every X second

问题描述

您好我想要做的apliacation其中每1秒调用功能或做其他事。 我有这个code这是不工作，你能告诉什么是错的？

Hello i wanna do apliacation which every 1 second call function or do something else. I have this code which is not working can you tell what is wrong?

public class App5_Thread extends Activity implements Runnable {    
        @Override
        public void onCreate(Bundle savedInstanceState) {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.main);
                Thread thread = new Thread(this);    
                thread.start();
        }
        @Override                    
        public void run() {                
                TextView tv1 = (TextView) findViewById(R.id.tv);
                showTime(tv1);                                                                
                try {
                    Thread.sleep(1000);
                }catch (Exception e) {
                    tv1.setText(e.toString());
                }            
        } 
        public void showTime(TextView tv1 ){                
            String DATE_FORMAT_NOW = "yyyy-MM-dd HH:mm:ss";
            Calendar cal = Calendar.getInstance();
            SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT_NOW);
            tv1.setText(sdf.format(cal.getTime())+" "+System.currentTimeMillis());                    
        }           

}

推荐答案

我有按照修改code

I have alter the code by following

有3种方式个个工作（显示日志输出）。

There are 3 ways all of them working(showing Log output).

但是TextView中没有更新。为什么呢？

package cz.cvut.fel.android;

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

public class App5_RepeatedAction extends Activity {

    static TextView tv1;    
    static class MyThread implements Runnable {
        public void run() {
            boolean end = false;
            while (!end) {
                String txt = "Vlakno id:" + Thread.currentThread().getId()+" THREAD";
                Log.v("MyActivity", txt);  
                //tv1.setText(txt);
                showTime(tv1);
                try {
                    Thread.sleep(10000);
                } catch (InterruptedException ex) {
                    System.err.println(ex.toString());
                }
            }
        }
    }    
    static void showTime(TextView tv1 ){                
        String DATE_FORMAT_NOW = "yyyy-MM-dd HH:mm:ss";
        Calendar cal = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT_NOW);
        tv1.setText(sdf.format(cal.getTime())+" "+System.currentTimeMillis());                    
    }
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        tv1 = (TextView) findViewById(R.id.tv);
        //----------ScheduledExecutorService
        ScheduledExecutorService exec = Executors.newSingleThreadScheduledExecutor();
        exec.scheduleAtFixedRate(new Runnable() {
            @Override
            public void run() {
                String txt = "ScheduledExecutorService";
                Log.v("MyActivity", txt);  
                //tv1.setText(txt);
                showTime(tv1);
            }
        }, 0, 5, TimeUnit.SECONDS);

        //----------TIMER
        Timer timer = new Timer();
        timer.scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {
                String txt = "Timer";
                Log.v("MyActivity", txt);  
                //tv1.setText(txt);
                showTime(tv1);
            }
        }, 0, 1000);
        //-----------THREAD
        try {
            boolean quit = false;           
            Thread t = new Thread(new MyThread());
            //t.setDaemon(true);
            t.start();            
        } catch (Exception e) {
            System.err.println(e.toString());
        }
    }
}

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