Android 线程thread的两种实现方法(必看)
这篇文章中有三点需要提前说明一下,
一:在android中有两种实现线程thread的方法:
一种是,扩展java.lang.Thread类
另一种是,实现Runnable接口
二:Thread类代表线程类,它的两个最主要的方法是:
run()——包含线程运行时所执行的代码
Start()——用于启动线程
三: Handler 机制,它是Runnable和Activity交互的桥梁,在run方法中发送Message,在Handler里,通过不同的Message执行不同的任务。
下面分别给出两种线程的实现方法,其一,扩展java.lang.Thread类,也就是把run()方法写到线程里面:
package com.my; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class Demo_For_Copy extends Activity { public Button button; public Handler mHandler=new Handler() { public void handleMessage(Message msg) { switch(msg.what) { case 1: button.setText(R.string.text2); break; default: break; } super.handleMessage(msg); } }; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); button=(Button)findViewById(R.id.button); Thread thread=new Thread(new Runnable() { @Override public void run() { Log.e("1111", "111111111"); // TODO Auto-generated method stub Message message=new Message(); message.what=1; mHandler.sendMessage(message); } }); thread.start(); } }
其二,实现Runnable接口,让类实现Runnable接口,然后把run方法单独提出来:
package com.my; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.LinearLayout; public class Title_Change_Demo extends Activity implements Runnable { public Button button; public LinearLayout my_layout; public Handler mHandler=new Handler() { public void handleMessage(Message msg) { switch(msg.what) { case 1: button.setText(R.string.text2); break; default: break; } my_layout.invalidate(); super.handleMessage(msg); } }; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); button=(Button)findViewById(R.id.button); my_layout=(LinearLayout)findViewById(R.id.my_layout); Thread thread=new Thread(this); thread.start(); } @Override public void run() { Log.e("ok", "111111111"); // TODO Auto-generated method stub Message message=new Message(); message.what=1; mHandler.sendMessage(message); } }
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