Android开发基础（八）：多线程及异步任务处理

(个人经验，仅供参考，错误之处，敬请谅解)

实现方式

1. Timer定时器

private void setCurrentProgress() {
	timer=new Timer();
    task=new TimerTask() {
     	@Override
        public void run() {
            Thread t=new Thread(){
                @Override
                public void run() {
                    super.run();
                    progressBar.setProgress(progress);
                    progress++;
                    if(progress==100){
                        task.cancel();
                        timer.cancel();
                        task=null;
                        timer=null;
                    }
                }
            };
            runOnUiThread(t);
        }
    };
    timer.schedule(task,1000,1000);
}
//该方法并不推荐，容易造成线程阻塞

2. Handler处理

private void setCurrentProgress() {
		handler=new Handler(){
            @Override
            public void handleMessage(Message msg) {
                super.handleMessage(msg);
                progressBar.setProgress(msg.arg1);
            }
        };

        new Thread(){
            @Override
            public void run() {
                super.run();
                while (progress<100) {
                    progress++;

                    Message msg=handler.obtainMessage();
                    msg.arg1=progress;

                    handler.sendMessage(msg);

                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }.start();

    }

3. AsyncTask异步任务

private void setCurrentProgress() {
	new MyTask().execute();
}

class MyTask extends AsyncTask{
    @Override
    protected Object doInBackground(Object[] params) {
        while (progress<100){
            progress++;
            publishProgress(progress);
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
    @Override
    protected void onProgressUpdate(Object[] values) {
        super.onProgressUpdate(values);
        progressBar.setProgress((Integer) values[0]);
    }
}