postDelayed的用法:

public class MainActivity extends Activity implements OnClickListener{    /**     * 音乐播放模块     */    private ImageButton p_w_picpathButton;    private ProgressBar progressBar;    private TextView textView;    private boolean isPlay = false;                        @Override    protected void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                                p_w_picpathButton = (ImageButton) findViewById(R.id.p_w_picpathButton1);        progressBar = (ProgressBar) findViewById(R.id.progressBar1);        textView = (TextView) findViewById(R.id.textView1);                                p_w_picpathButton.setOnClickListener(this);    }                        @Override    public boolean onCreateOptionsMenu(Menu menu)    {        getMenuInflater().inflate(R.menu.activity_main, menu);        return true;    }                        @Override    public void onClick(View v)    {        switch (v.getId())        {        case R.id.p_w_picpathButton1:            imgClick();            break;                                default:            break;        }    }                        private void imgClick()    {        isPlay = !isPlay;        if(isPlay)//更换播放按钮图片        {            p_w_picpathButton.setImageResource(R.drawable.ic_pause);            play();//调用播放方法        }        else        {            p_w_picpathButton.setImageResource(R.drawable.ic_play);        }    }                        private int playTime;    private Runnable action = null;                        private void play()    {        new Thread()        {            public void run()            {                                                //使用postDelayed定时发送消息                action = new Runnable()// 创建action时并不执行run()方法                {                    @Override                    public void run()                    {                        if(isPlay)                        {                            playTime++;                            textView.setText(playTime + "");                            p_w_picpathButton.postDelayed(action, 1000);// 回调action                            progressBar.setProgress(playTime);                        }                    }                };                p_w_picpathButton.postDelayed(action, 0);// 创建action后执行此方法，回调Runnable()里的run方法                                                                        };        }.start();    }}

模拟音乐播放计时和进度条：

public class MainActivity extends Activity implements OnClickListener,        OnSeekBarChangeListener{    private ImageButton p_w_picpathButton;    private SeekBar seekBar;    private TextView textView_playtime;    private boolean isPlay = false;    private Chronometer mTimer;    private TextView textView_lasttime;    private long firstClickTime = 0;                               @Override    protected void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                     p_w_picpathButton = (ImageButton) findViewById(R.id.p_w_picpathButton1);        seekBar = (SeekBar) findViewById(R.id.seekBar1);        textView_playtime = (TextView) findViewById(R.id.textView_playtime);        textView_lasttime = (TextView) findViewById(R.id.textView_lasttime);        mTimer = (Chronometer) findViewById(R.id.chronometer1);                     p_w_picpathButton.setOnClickListener(this);        seekBar.setOnSeekBarChangeListener(this);        seekBar.setMax(lastTime());    }             @Override    public boolean onCreateOptionsMenu(Menu menu)    {        getMenuInflater().inflate(R.menu.activity_main, menu);        return true;    }             @Override    public void onClick(View v)    {        switch (v.getId())        {            case R.id.p_w_picpathButton1:                imgClick();                break;                             default:                break;        }    }             private void imgClick()    {        //用户点击间隔在1秒之内，就不响应(不再启动新线程，避免连续点击的加速问题)        long secondClickTime = System.currentTimeMillis();        if(secondClickTime - firstClickTime < 1000)        {            return;        }        firstClickTime = System.currentTimeMillis();                     isPlay = !isPlay;        if (isPlay)// 更换播放按钮图片        {            p_w_picpathButton.setImageResource(R.drawable.ic_play);            play();// 调用播放方法        }        else        {            p_w_picpathButton.setImageResource(R.drawable.ic_pause);        }    }             private int playTime;    private Runnable action = null;             private void play() // 播放音乐    {        new Thread()        {            public void run()            {                action = new Runnable()                {                    @Override                    public void run()                    {                                                     if (isPlay)                        {                            if (playTime > lastTime())                            {                                prostop();                            }                            else                            {                                textView_playtime.setText(progresstime(playTime));                                seekBar.setProgress(playTime);                                p_w_picpathButton.postDelayed(action, 1000);                                playTime += 1000;                            }                        }                    }                };                p_w_picpathButton.postDelayed(action, 0);            };        }.start();    }             private void prostop()//播放结束    {        new Thread()        {            @Override            public void run()            {                Runnable actionStop = new Runnable()                {                    @Override                    public void run()                    {                        p_w_picpathButton.setImageResource(R.drawable.ic_pause);                        isPlay = false;                        playTime = 0;                        seekBar.setProgress(playTime);                    }                };                p_w_picpathButton.post(actionStop);            }        }.start();    }             // 得到结束时间的毫秒数    private int lastTime()    {        String[] str = textView_lasttime.getText().toString().split(":");        return (Integer.parseInt(str[1]) + Integer.parseInt(str[0]) * 60) * 1000;    }             // 监听进度条方法    @Override    public void onProgressChanged(SeekBar seekBar, int progress,            boolean fromUser)    {        playTime = progress;    }             @Override    public void onStartTrackingTouch(SeekBar seekBar)    {                 }             @Override    public void onStopTrackingTouch(SeekBar seekBar)    {                 }             // 将毫秒数转换为时间格式    private String progresstime(int progress)    {        Date date = new Date(progress);        SimpleDateFormat format = new SimpleDateFormat("mm:ss");        return format.format(date);    }         }