HandlerThread更新ui和Log日志的用法

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1、HandlerThread 用法实例

package com.example.handledemos;

import com.example.handledemos.util.LogUtil;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
/**
* 主线程与子线程之间的信息交互
* @author lzl
*用到HandlerThread方法，主要解决多线程并发问题。
*/
public class HandlerThreadActivity extends Activity implements OnClickListener{
   //创建主线程中的handler
   private Handler handler = new Handler(){
       public void handleMessage(android.os.Message msg) {
           Message message = new Message();
           //handlerthread每隔1秒向子线程发送一次消息。
           handlerthread.sendMessageDelayed(message, 1000);
           LogUtil.i("主线程", "Main send the message");
       };
   };

   private Handler handlerthread;
   private HandlerThread thread;
   private Button button1;
   private Button button2;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.handlerthread);
       button1 = (Button) findViewById(R.id.button1);
       button2 = (Button) findViewById(R.id.button2);

       button1.setOnClickListener(this);
       button2.setOnClickListener(this);

       thread = new HandlerThread("threadHandler");
       thread.start();
       handlerthread = new Handler(thread.getLooper()){
           @Override
           public void handleMessage(Message msg) {
               Message message = new Message();
               //handler每隔1秒向主线程发送一次消息。
               handler.sendMessageDelayed(message, 1000);
               LogUtil.i("子线程", "Thread send the message");
           }
       };
   }
   @Override
   public void onClick(View v) {
       switch (v.getId()) {
       case R.id.button1:
           handler.sendEmptyMessage(1);
           break;
       case R.id.button2:
           handler.removeMessages(0);    //传入0时会停止发送消息。
           break;
       default:
           break;
       }
   }
}

2、Log控制打印，在完成大型项目后，运行程序是还会打印Log信息，程序员不可能将其逐个删除掉。因此可以写个Util包，来控制Log日志的打印。

当完成工程后，就不用担心这个问题了。

package com.example.handledemos.util;

import android.util.Log;

public class LogUtil {
   public static final int VERBOSE = 1;
   public static final int DEBUG = 2;
   public static final int INFO = 3;
   public static final int WARN = 4;
   public static final int ERROR = 5;
   public static final int NOTHING = 6;
   public static final int LEVEL = NOTHING;

   public static void v(String tag , String msg){
       if(LEVEL <= VERBOSE){
           Log.v(tag, msg);
       }
   }
   public static void d(String tag , String msg){
       if(LEVEL <= DEBUG){
           Log.d(tag, msg);
       }
   }
   public static void i(String tag , String msg){
       if(LEVEL <= INFO){
           Log.i(tag, msg);
       }
   }
   public static void w(String tag , String msg){
       if(LEVEL <= WARN){
           Log.w(tag, msg);
       }
   }
   public static void e(String tag , String msg){
       if(LEVEL <= ERROR){
           Log.e(tag, msg);
       }
   }
}

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