Android的两种异步调用

1. Handler + Thread
由主线程打开对话框, 然后使用新的线程(Handler.sendMessage(message))对它进行操作, 包括修改和关闭等.
定义

    class MyHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);    //To change body of overridden methods use File | Settings | File Templates.
            switch (msg.what) {
                case PRO_ADD:
                    progressBar.setProgress(count);
                    break;
            }

        }
    }


}

调用

package com.example.ADemo6;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.Toast;

public class MyActivity extends Activity {
    /**
     * Called when the activity is first created.
     */
    private static final int PRO_ADD = 1;
    private ProgressBar progressBar;
    private MyHandler myHandler = new MyHandler();
    private int count=0;

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

        Button button1 = (Button) findViewById(R.id.button1);
        progressBar = (ProgressBar) findViewById(R.id.progressBar);

        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                final int max = progressBar.getMax();

                Thread thread = new Thread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            for (int i = 0; i < max; i++) {
                                Message message = new Message();
                                Thread.sleep(50);
                                if (i > 100) {
                                    count = 100;
                                    message.what = PRO_ADD;
                                    myHandler.sendMessage(message);
                                } else {
                                    count = progressBar.getProgress()+2;
                                    message.what = PRO_ADD;
                                    myHandler.sendMessage(message);
                                }

                            }
                        } catch (InterruptedException e) {
                            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
                        }
                    }
                });
                thread.start();

            }
        });
    }
}

2. AsyncTask，参考： http://www.cnblogs.com/jingd/archive/2012/03/10/2389648.html
异步处理程序 

    class AnsyTry extends AsyncTask<String, TextView, Double> {  
  
        TextView te = null;  
  
        public AnsyTry(TextView te) {  
            super();  
            this.te = te;  
        }  
  
        @Override  
        protected Double doInBackground(String... params) {  
            double dou = 0;  
            dou = 100;  
            searchFromWebService(te);  //处理事情的方法......
            publishProgress(te);  
            return dou;  
        }  
  
        @Override  
        protected void onPostExecute(Double result) {  
            super.onPostExecute(result);  
        }  
  
        @Override  
        protected void onPreExecute() {  
            super.onPreExecute();  
        }  
  
        @Override  
        protected void onProgressUpdate(TextView... values) {  
            super.onProgressUpdate(values);  
        }  
  
    }  

调用：

                    AnsyTry anys = new AnsyTry(textView2);  
                    anys.execute();