安卓 异步线程更新Ui

异步跟新UI：

1、handler+Thread（runnable）:如果handler和Thread都写在了一个Java文件中，就不说了，如果runnable定义在了一个单独的类文件中，可以通过在构造方法里接收handler参数，然后执行完耗时操作后，通过handler发送消息来通知主UI线程更新UI

2、接口回调，定义一个接口，然后在主UI执行耗时操作的时候，借助匿名内部类，在这里写异步线程返回来的数据处理操作，异步线程接收一个匿名的内部类实例，然后在执行完耗时操作后回调接口的方法，可以把耗时的操作的结果返回给回调函数

1的代码实现：

package com.example.testtesttest;

import org.json.JSONArray;

import com.example.testtesttest.DataRunnable.dataCallBackLisener;


import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.app.FragmentTransaction;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.support.v4.app.FragmentManager;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity implements android.view.View.OnClickListener{
        
        private Button button = null;
        private dataCallBackLisener callbackListener ;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    
        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(this);
        }
        @Override
        public void onClick(View v) {
        switch (v.getId()) {
        case R.id.button:
            
        
            DataRunnable runnable = new DataRunnable(handler);
            Thread thread = new Thread(runnable);
            thread.start();
        
            
        break;
        default:
        break;
        }
        }
        
        public Handler handler = new Handler(){
            public void handleMessage(android.os.Message msg) {
                switch (msg.what) {
                case 1:
                    button.setText("hhh");
                    break;

                default:
                    break;
                }
            };
        };
        
        
}

package com.example.testtesttest;

import android.os.Handler;


public class DataRunnable implements Runnable{
    private String[] dataString = new String[5];
    private dataCallBackLisener listener;
    private Handler dataHandler;
    public DataRunnable(dataCallBackLisener alistener){
        this.listener =alistener;
    }
    public DataRunnable(Handler aHandler){
        this.dataHandler =aHandler;
    }
    @Override
    public void run() {
        // TODO Auto-generated method stub
        for(int i =0 ; i <5;i++)
        {
            dataString[i] = i+"";
        }
        dataHandler.sendEmptyMessage(1);
        //listener.dataCallback(dataString);
    }
    public interface dataCallBackLisener{
        public void dataCallback(String[] str);
    }
}

2的代码实现：

package com.example.testtesttest;

import org.json.JSONArray;

import com.example.testtesttest.DataRunnable.dataCallBackLisener;


import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.app.FragmentTransaction;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.support.v4.app.FragmentManager;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity implements android.view.View.OnClickListener{
        
        private Button button = null;
        private dataCallBackLisener callbackListener ;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
/*        JSONArray json = new JSONArray();
        for(int i =0 ; i<4 ; i++){
            json.put(i);
        }
        
        
        String[] a = {"1","2","3"};
        Log.e("Loooooooooook",a.toString());*/
        button = (Button) findViewById(R.id.button);
        button.setOnClickListener(this);
        }
        @Override
        public void onClick(View v) {
        switch (v.getId()) {
        case R.id.button:
            
            DataRunnable runnable = new DataRunnable(new dataCallBackLisener() {
                
                @Override
                public void dataCallback(String str) {
                    // TODO Auto-generated method stub
                    Log.e("hahahaahahahah", str.toString());
                    button.setText(str.toString()); //更新UI
                }
            });
            runOnUiThread(runnable);
            /*DataRunnable runnable = new DataRunnable(handler);
            Thread thread = new Thread(runnable);
            thread.start();*/
        /*AnotherFragment fragment = new AnotherFragment();
        android.app.FragmentManager fragmentManager = getFragmentManager();
        FragmentTransaction transaction = fragmentManager.
        beginTransaction();
        transaction.replace(R.id.right_layout, fragment);
        transaction.commit();*/
            
            
        break;
        default:
        break;
        }
        }
        
        public Handler handler = new Handler(){
            public void handleMessage(android.os.Message msg) {
                switch (msg.what) {
                case 1:
                    button.setText("hhh");
                    break;

                default:
                    break;
                }
            };
        };
        
        
}

package com.example.testtesttest;

import android.os.Handler;


public class DataRunnable implements Runnable{
    private StringBuilder dataString = new StringBuilder();
    private dataCallBackLisener listener;
    private Handler dataHandler;
    public DataRunnable(dataCallBackLisener alistener){
        this.listener =alistener;
    }
    public DataRunnable(Handler aHandler){
        this.dataHandler =aHandler;
    }
    @Override
    public void run() {
        // TODO Auto-generated method stub
        for(int i =0 ; i <5;i++)
        {
            dataString.append(i);
        }
        //dataHandler.sendEmptyMessage(1);
        listener.dataCallback(dataString.toString());
    }
    public interface dataCallBackLisener{
        public void dataCallback(String str);
    }
}

注意2中，thread必须是UIthread，这样才能更新主UI的控件

最后对回调函数的理解博客：

http://www.zhihu.com/question/19801131

http://www.jianshu.com/p/cd35ce823602

http://www.bkjia.com/Androidjc/853632.html

最后一篇讲了名词：接口对象？？？不懂。。。。