Android Thread Handler UIHandler demos

extends：http://blog.csdn.net/superjunjin/article/details/7540064

序效果：为了显示如何用message传值的简单例子

例1，点击按钮，持续显示当前系统时间（bundle传值，耗时，效率低）

例2，点击按钮，progressbar持续前进（message方法传值，效率高，但只能传整型int和对象object）

例1，主activity 

package com.song;  

import java.text.SimpleDateFormat;
import java.util.Date;  

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

public class C91_HandlerActivity extends Activity {
    /** Called when the activity is first created. */
    TextView textview;
    Button button;
    MyThread mythread;
    Thread thread;
    MyHandler handler;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        textview=(TextView)findViewById(R.id.textview);
        button=(Button)findViewById(R.id.button);
        handler=new MyHandler();
        button.setOnClickListener(new OnClickListener() {  

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                mythread=new MyThread();
                thread=new Thread(mythread);
                thread.start();
            }
        });
    }
    class MyHandler extends Handler
    {
        //接受message的信息
        @Override
        public void handleMessage(Message msg) {
            // TODO Auto-generated method stub
            super.handleMessage(msg);
            if(msg.what==1)
            {
                textview.setText(msg.getData().getString("time"));
            }  

        }
    }
    class MyThread implements Runnable
    {  

        @Override
        public void run() {
            // TODO Auto-generated method stub
            while(true)
            {
                try {
                    Thread.sleep(1000);
                    String time=new SimpleDateFormat("yyyy/MM/dd HH:mm:ss").format(new Date());
                    System.out.println(time);
                    Message message=new Message();
                    Bundle bundle=new Bundle();
                    bundle.putString("time", time);
                    message.setData(bundle);//bundle传值，耗时，效率低
                    handler.sendMessage(message);//发送message信息
                    message.what=1;//标志是哪个线程传数据
                    //message有四个传值方法，
                    //两个传int整型数据的方法message.arg1，message.arg2
                    //一个传对象数据的方法message.obj
                    //一个bandle传值方法  

                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }  

    }
}  

布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
<Button  android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="开始"
        android:id="@+id/button"/>
    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="20dp"
        android:textStyle="bold"
        android:id="@+id/textview"/>  

</LinearLayout>  

例2，主activity

package com.song;  

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

public class C92_Handler2Activity extends Activity {
    /** Called when the activity is first created. */
    Button button;
    ProgressBar bar;
    MyThread mythread;
    Thread thread;
    MyHandler handler;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button=(Button)findViewById(R.id.button);
        bar=(ProgressBar)findViewById(R.id.bar);
        handler=new MyHandler();
        button.setOnClickListener(new OnClickListener() {  

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                mythread=new MyThread();
                thread=new Thread(mythread);
                thread.start();
            }
        });
    }
    class MyHandler extends Handler
    {
        @Override
        public void handleMessage(Message msg) {
            // TODO Auto-generated method stub
            super.handleMessage(msg);
            if(msg.what==1)
            {
                System.out.println(msg.arg1+"handle");
                bar.setProgress(msg.arg1);
            }
        }
    }  

    class MyThread implements Runnable
    {
        int pro=0;
        @Override
        public void run() {
            // TODO Auto-generated method stub
            while(true)
            {
                try {
                    Thread.sleep(1000);
                    pro=bar.getProgress()+1;
                    bar.setProgress(pro);
                    System.out.println(pro+"thread");
                    Message message=new Message();
                    message.arg1=pro;
                    message.what=1;
                    handler.sendMessage(message);  

                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }  

            }
        }  

    }  

}  

布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
<Button android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/button"
        android:text="开始"
    />
    <ProgressBar android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/bar"
        style="@android:style/Widget.ProgressBar.Horizontal"
        />  

</LinearLayout>  

显示效果

、

-------------------------------------------------------------

 extends:http://blog.csdn.net/shenyuemei/article/details/11030679

在工作线程中处理UI线程报错：Only the original thread that created a view hierarchy can touch its views.

如果将更新UI控件的代码写入到工作线程中便会报错，

Runnable socketRun = new Runnable() {  

        @Override
        public void run() {
            // TODO Auto-generated method stub
            tv = (TextView) findViewById(R.id.tv);
            Socket socket = null;
            String message = et.getText().toString() + "\r\n";
            try {
                // 创建socket
                socket = new Socket("192.168.1.34", 8080);
                // 向服务器发送消息
                PrintWriter out = new PrintWriter(new OutputStreamWriter(
                        socket.getOutputStream()), true);
                out.println(message);
                // 接收来自服务器的消息
                BufferedReader br = new BufferedReader(new InputStreamReader(
                        socket.getInputStream()));
                msgs = br.readLine();
                //下面是更新UI的代码，这样写是错误的
                if (msgs != null) {
                    tv.setText(msgs);
                } else {
                    tv.setText("数据错误！");
                }
                out.close();
                br.close();
                socket.close();
            } catch (UnknownHostException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    };
 

错误如下：

android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.

因为这样会阻塞住线程。

有一下三种改法：

第一种：利用Message来传递信息给Handler来处理UI的更新问题

Runnable socketRun = new Runnable() {  

        @Override
        public void run() {
            // TODO Auto-generated method stub
            tv = (TextView) findViewById(R.id.tv);
            Socket socket = null;
            String message = et.getText().toString() + "\r\n";
            try {
                // 创建socket
                socket = new Socket("192.168.1.34", 8080);
                // 向服务器发送消息
                PrintWriter out = new PrintWriter(new OutputStreamWriter(
                        socket.getOutputStream()), true);
                out.println(message);
                // 接收来自服务器的消息
                BufferedReader br = new BufferedReader(new InputStreamReader(
                        socket.getInputStream()));
                msgs = br.readLine();
                <span style="color:#000000;">//实例化message对象
                Message msg = new Message();
                //给message对象赋值
                msg.what = 1;
                //发送message值给Handler接收
                mHandler.sendMessage(msg);
</span>             out.close();
                br.close();
                socket.close();
            } catch (UnknownHostException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    };  

    <span style="color:#000000;">private Handler mHandler = new Handler() {
        public void handleMessage(Message msg) {
            // 更新UI
            switch (msg.what) {
            case 1:
                if (msgs != null) {
                    tv.setText(msgs);
                } else {
                    tv.setText("数据错误！");
                }
                break;
            }  

        };
    };</span>  

第二种：利用Handler的post方法

Runnable socketRun = new Runnable() {  

        @Override
        public void run() {
            // TODO Auto-generated method stub
            tv = (TextView) findViewById(R.id.tv);
            Socket socket = null;
            String message = et.getText().toString() + "\r\n";
            try {
                // 创建socket
                socket = new Socket("192.168.1.34", 8080);
                // 向服务器发送消息
                PrintWriter out = new PrintWriter(new OutputStreamWriter(
                        socket.getOutputStream()), true);
                out.println(message);
                // 接收来自服务器的消息
                BufferedReader br = new BufferedReader(new InputStreamReader(
                        socket.getInputStream()));
                msgs = br.readLine();  

                <span style="color:#000000;">mHandler.post(updateThread);
</span>
                out.close();
                br.close();
                socket.close();
            } catch (UnknownHostException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    };  

    <span style="color:#000000;">private Handler mHandler = new Handler();  

    Runnable updateThread = new Runnable()
       {     

            @Override
            public void run()
            {
                //更新UI
                if (msgs != null) {
                    tv.setText(msgs);
                } else {
                    tv.setText("数据错误！");
                }
           }     

       };</span>  

第三种方法：官方推荐的方法