import kotlin.concurrent.fixedRateTimer

val timer = fixedRateTimer("Tag", false, 1000, 2500) { /* Your code here */ }

Kotlin非常简单

好的，因为这还没有清除，有3个简单的方法来处理这个。 下面的示例显示了所有3种方法，底部的示例显示了我认为更可取的方法。还记得在onPause中清理你的任务，如有必要保存状态。

import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.Handler.Callback;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class main extends Activity {
    TextView text, text2, text3;
    long starttime = 0;
    //this  posts a message to the main thread from our timertask
    //and updates the textfield
   final Handler h = new Handler(new Callback() {

        @Override
        public boolean handleMessage(Message msg) {
           long millis = System.currentTimeMillis() - starttime;
           int seconds = (int) (millis / 1000);
           int minutes = seconds / 60;
           seconds     = seconds % 60;

           text.setText(String.format("%d:%02d", minutes, seconds));
            return false;
        }
    });
   //runs without timer be reposting self
   Handler h2 = new Handler();
   Runnable run = new Runnable() {

        @Override
        public void run() {
           long millis = System.currentTimeMillis() - starttime;
           int seconds = (int) (millis / 1000);
           int minutes = seconds / 60;
           seconds     = seconds % 60;

           text3.setText(String.format("%d:%02d", minutes, seconds));

           h2.postDelayed(this, 500);
        }
    };

   //tells handler to send a message
   class firstTask extends TimerTask {

        @Override
        public void run() {
            h.sendEmptyMessage(0);
        }
   };

   //tells activity to run on ui thread
   class secondTask extends TimerTask {

        @Override
        public void run() {
            main.this.runOnUiThread(new Runnable() {

                @Override
                public void run() {
                   long millis = System.currentTimeMillis() - starttime;
                   int seconds = (int) (millis / 1000);
                   int minutes = seconds / 60;
                   seconds     = seconds % 60;

                   text2.setText(String.format("%d:%02d", minutes, seconds));
                }
            });
        }
   };


   Timer timer = new Timer();
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        text = (TextView)findViewById(R.id.text);
        text2 = (TextView)findViewById(R.id.text2);
        text3 = (TextView)findViewById(R.id.text3);

        Button b = (Button)findViewById(R.id.button);
        b.setText("start");
        b.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Button b = (Button)v;
                if(b.getText().equals("stop")){
                    timer.cancel();
                    timer.purge();
                    h2.removeCallbacks(run);
                    b.setText("start");
                }else{
                    starttime = System.currentTimeMillis();
                    timer = new Timer();
                    timer.schedule(new firstTask(), 0,500);
                    timer.schedule(new secondTask(),  0,500);
                    h2.postDelayed(run, 0);
                    b.setText("stop");
                }
            }
        });
    }

    @Override
    public void onPause() {
        super.onPause();
        timer.cancel();
        timer.purge();
        h2.removeCallbacks(run);
        Button b = (Button)findViewById(R.id.button);
        b.setText("start");
    }
}

要记住的主要事情是，UI只能从主UI线程修改，所以使用处理程序或活动。

以下是我认为最好的方法。

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class TestActivity extends Activity {

    TextView timerTextView;
    long startTime = 0;

    //runs without a timer by reposting this handler at the end of the runnable
    Handler timerHandler = new Handler();
    Runnable timerRunnable = new Runnable() {

        @Override
        public void run() {
            long millis = System.currentTimeMillis() - startTime;
            int seconds = (int) (millis / 1000);
            int minutes = seconds / 60;
            seconds = seconds % 60;

            timerTextView.setText(String.format("%d:%02d", minutes, seconds));

            timerHandler.postDelayed(this, 500);
        }
    };

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test_activity);

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

        Button b = (Button) findViewById(R.id.button);
        b.setText("start");
        b.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Button b = (Button) v;
                if (b.getText().equals("stop")) {
                    timerHandler.removeCallbacks(timerRunnable);
                    b.setText("start");
                } else {
                    startTime = System.currentTimeMillis();
                    timerHandler.postDelayed(timerRunnable, 0);
                    b.setText("stop");
                }
            }
        });
    }

  @Override
    public void onPause() {
        super.onPause();
        timerHandler.removeCallbacks(timerRunnable);
        Button b = (Button)findViewById(R.id.button);
        b.setText("start");
    }

}

我用这种方法:

String[] array={
       "man","for","think"
}; int j;

然后在onCreate下面

TextView t = findViewById(R.id.textView);

    new CountDownTimer(5000,1000) {

        @Override
        public void onTick(long millisUntilFinished) {}

        @Override
        public void onFinish() {
            t.setText("I "+array[j] +" You");
            j++;
            if(j== array.length-1) j=0;
            start();
        }
    }.start();

解决这个问题很简单。

您需要创建一个线程来处理更新循环，并使用它来更新文本区域。棘手的部分是只有主线程可以修改ui，所以更新循环线程需要通知主线程进行更新。这是使用处理程序完成的。

查看这个链接:http://developer.android.com/guide/topics/ui/dialogs.html# 点击标题为“Example ProgressDialog with a second thread”的部分。这是一个你需要做什么的例子，除了一个进度对话框而不是一个文本框。

您希望UI更新发生在已经存在的UI线程中。

最好的方法是使用一个Handler，它使用postDelayed在延迟后运行一个Runnable(每次运行都安排下一次运行);使用removeCallbacks清除回调。

您已经找到了正确的地方，所以再看一遍，也许可以弄清楚为什么代码示例不是您想要的。(请参见从计时器更新UI的同一篇文章)。

他是更简单的解决方案，工作在我的应用程序。

  public class MyActivity extends Acitivity {

    TextView myTextView;
    boolean someCondition=true;

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

            myTextView = (TextView) findViewById(R.id.refreshing_field);

            //starting our task which update textview every 1000 ms
            new RefreshTask().execute();



        }

    //class which updates our textview every second

    class RefreshTask extends AsyncTask {

            @Override
            protected void onProgressUpdate(Object... values) {
                super.onProgressUpdate(values);
                String text = String.valueOf(System.currentTimeMillis());
                myTextView.setText(text);

            }

            @Override
            protected Object doInBackground(Object... params) {
                while(someCondition) {
                    try {
                        //sleep for 1s in background...
                        Thread.sleep(1000);
                        //and update textview in ui thread
                        publishProgress();
                    } catch (InterruptedException e) {
                        e.printStackTrace(); 

                };
                return null;
            }
        }
    }