Android handle 多线程练习

Android handle

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context=".MainActivity" >

     <TextView
         android:id="@+id/text_id"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/hello_world" />
     <Button
         android:id="@+id/btn"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="Button"
         android:layout_below="@id/text_id"

         />

 </RelativeLayout>

 package com.ibox365.s0725001;

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

 public class MainActivity extends Activity {

     private Button button;
     private Handler handler;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         button=(Button) findViewById(R.id.btn);
         button.setOnClickListener(new ButtonListen());

         handler=new myHandle();

     }

     class ButtonListen implements OnClickListener
     {

         /* (non-Javadoc)
          * @see android.view.View.OnClickListener#onClick(android.view.View)
          */
         @Override
         public void onClick(View v) {
             // TODO Auto-generated method stub

             Message msg=handler.obtainMessage();
             msg.what=2;
             handler.sendMessage(msg);
         }

     }

     class  myHandle extends Handler{

         /* (non-Javadoc)
          * @see android.os.Handler#handleMessage(android.os.Message)
          */
         @Override
         public void handleMessage(Message msg) {
             // TODO Auto-generated method stub
             super.handleMessage(msg);

         int what    =msg.what;
         System.out.println(what);

         }

     } 

     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.
         getMenuInflater().inflate(R.menu.main, menu);
         return true;
     }

 }

多线程 操作

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/text_id"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
    <Button
        android:id="@+id/btn_id"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="发送消息"

        />

</LinearLayout>

package com.ibox365.s0725002;

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

public class MainActivity extends Activity {

    private Button button;
    private TextView textView;
    private Handler handler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

       button=(Button) findViewById(R.id.btn_id);
       button.setOnClickListener(new ButtonListen());
       textView=(TextView) findViewById(R.id.text_id);
       handler=new MyHandle();

    }

     class ButtonListen implements OnClickListener
     {
        @Override
        public void onClick(View v) {
            Thread thread=new MyThread();
            thread.start();
        }
    }
     class MyThread extends Thread{

        @Override
        public void run() {
            System.out.println("MyThread==>"+Thread.currentThread().getName());

            try {
                Thread.sleep(2*1000);
            } catch (InterruptedException e) {

                e.printStackTrace();
            }

            String s="get data from network!";
            Message msg=handler.obtainMessage();
            msg.obj=s;
            handler.sendMessage(msg);
        }
     }

     class MyHandle extends Handler{
        @Override
        public void handleMessage(Message msg) {

            System.out.println("MyHandle==>"+Thread.currentThread().getName());
          String s=(String) msg.obj;
          textView.setText(s);
        }
     }

}

思路图：