HandlerThread更新ui和Log日志的用法

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);

}

}

}