参考：http://www.cnblogs.com/highriver/archive/2011/12/18/2291965.html
通过对以上文章的拜读，我进一步加深了对线程同步锁的理解。
下面就根据自己的理解，进行的简单实例操作演示。
在看下面的代码前，强烈建议先拜读上面的文章。
源码下载：http://download.csdn.net/detail/yang_hui1986527/4423728
MainActivity.java
package com.snowdream.demo;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends Activity {
private static final int MSG_CLEAR = 0;
private static final int MSG_UPDATE = 1;
private final Object mObject = new Object();
private final String tag = "MainActivity";
ExecutorService pool = null;
private static TextView mTextView = null;
private static Handler mHandler = new Handler(){
public void handleMessage(Message msg){
switch (msg.what) {
case MSG_CLEAR:
mTextView.setText("");
break;
case MSG_UPDATE:
String str = (String)msg.obj;
if (!TextUtils.isEmpty(str)) {
mTextView.append(str);
mTextView.append("\n");
}
break;
default:
break;
}
};
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
}
private void initView() {
mTextView = (TextView)findViewById(R.id.textView1);
}
private void initData() {
pool = Executors.newFixedThreadPool(2);
}
@Override
protected void onDestroy() {
super.onDestroy();
pool.shutdown();
}
public void OnButton1Click(View view) {
int id = view.getId();
switch (id) {
case R.id.button1:
//synchronized(class)
//synchronized(this)
mHandler.sendMessage(mHandler.obtainMessage(MSG_CLEAR));
Sync1_Class sync1_Class = new Sync1_Class();
Sync1_Object sync1_Object = new Sync1_Object();
pool.execute(sync1_Class);
pool.execute(sync1_Object);
break;
case R.id.button2:
//synchronized(this)
//synchronized(this)
mHandler.sendMessage(mHandler.obtainMessage(MSG_CLEAR));
Sync2_Object_1 sync2_Object_1 = new Sync2_Object_1();
Sync2_Object_2 sync2_Object_2 = new Sync2_Object_2();
pool.execute(sync2_Object_1);
pool.execute(sync2_Object_2);
break;
case R.id.button3:
//synchronized(class)
//synchronized(class)
mHandler.sendMessage(mHandler.obtainMessage(MSG_CLEAR));
Sync3_Class_1 sync3_Class_1 = new Sync3_Class_1();
Sync3_Class_2 sync3_Class_2 = new Sync3_Class_2();
pool.execute(sync3_Class_1);
pool.execute(sync3_Class_2);
break;
default:
break;
}
}
public class Sync1_Class implements Runnable {
public void run() {
synchronized(MainActivity.class){
for (int i = 0; i < 100; i++) {
Log.i(tag, "Sync1_Class: "+ i);
mHandler.sendMessage(mHandler.obtainMessage(MSG_UPDATE, "Sync1_Class: "+ i));
}
}
}
}
public class Sync1_Object implements Runnable {
public void run() {
synchronized(mObject){
for (int i = 0; i < 100; i++) {
Log.i(tag, "Sync1_Object: "+ i);
mHandler.sendMessage(mHandler.obtainMessage(MSG_UPDATE, "Sync1_Object: "+ i));
}
}
}
}
public class Sync2_Object_1 implements Runnable {
public void run() {
synchronized(mObject){
for (int i = 0; i < 100; i++) {
Log.i(tag, "Sync2_Object_1: "+ i);
mHandler.sendMessage(mHandler.obtainMessage(MSG_UPDATE, "Sync2_Object_1: "+ i));
}
}
}
}
public class Sync2_Object_2 implements Runnable {
public void run() {
synchronized(mObject){
for (int i = 0; i < 100; i++) {
Log.i(tag, "Sync2_Object_2: "+ i);
mHandler.sendMessage(mHandler.obtainMessage(MSG_UPDATE, "Sync2_Object_2: "+ i));
}
}
}
}
public class Sync3_Class_1 implements Runnable {
public void run() {
synchronized(MainActivity.class){
for (int i = 0; i < 100; i++) {
Log.i(tag, "Sync3_Class_1: "+ i);
mHandler.sendMessage(mHandler.obtainMessage(MSG_UPDATE, "Sync3_Class_1: "+ i));
}
}
}
}
public class Sync3_Class_2 implements Runnable {
public void run() {
synchronized(MainActivity.class){
for (int i = 0; i < 100; i++) {
Log.i(tag, "Sync3_Class_2: "+ i);
mHandler.sendMessage(mHandler.obtainMessage(MSG_UPDATE, "Sync3_Class_2: "+ i));
}
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
activity_main.xml
<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" >
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentTop="true" >
<Button
android:id="@+id/button1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:onClick="OnButton1Click"
android:text="Button1" />
<Button
android:id="@+id/button2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:onClick="OnButton1Click"
android:text="Button2" />
<Button
android:id="@+id/button3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:onClick="OnButton1Click"
android:text="Button3" />
</LinearLayout>
<ScrollView
android:id="@+id/scrollView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/linearLayout1"
android:layout_toLeftOf="@+id/textView1" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="@dimen/padding_small"
android:text="Loading..."
tools:context=".MainActivity" />
</ScrollView>
</RelativeLayout>
效果预览：
