转自：http://blog.csdn.net/annkie/article/details/8496219

Android:UI更新方法四:在Worker Thread中runOnUiThread直接刷新UI

activity_main.xml:

[html] view plain copy

<LinearLayoutxmlns: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:orientation="vertical"
tools:context=".MainActivity">
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:background="#ff999999"
android:text="@string/hello_world"/>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"/>
</LinearLayout>

MainActivity.java:

[java] view plain copy

packagecom.example.updateui;
importandroid.os.Bundle;
importandroid.os.Handler;
importandroid.os.Message;
importandroid.app.Activity;
importandroid.util.Log;
importandroid.view.Menu;
importandroid.view.View;
importandroid.view.Window;
importandroid.view.View.OnClickListener;
importandroid.widget.Button;
importandroid.widget.TextView;
publicclassMainActivityextendsActivity
{
privatestaticfinalStringTAG=MainActivity.class.getSimpleName();
privatestaticfinalintREFRESH_ACTION=1;
privateButtonmButton;
privateTextViewmTextView;
privateintmCount=0;
@Override
protectedvoidonCreate(BundlesavedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextView=(TextView)findViewById(R.id.textView1);
mButton=(Button)findViewById(R.id.button1);
mButton.setOnClickListener(newOnClickListener()
{
@Override
publicvoidonClick(Viewarg0)
{
//TODOAuto-generatedmethodstub
newThread()//workerthread
{
@Override
publicvoidrun()
{
while((mCount<100))
{
MainActivity.this.runOnUiThread(newRunnable()//工作线程刷新UI
{//这部分代码将在UI线程执行，实际上是runOnUiThreadpostRunnable到UI线程执行了
@Override
publicvoidrun()
{
mCount++;
mTextView.setText("I'mupdated:"
+mCount);
Log.i(TAG,"Count:"+mCount);
}
});
try
{
Thread.sleep(1000);
}
catch(InterruptedExceptione)
{
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
}
}.start();
}
});
}
}

public final voidrunOnUiThread(Runnableaction)

Added in API level 1

Runs the specified action on the UI thread. If the current thread is the UI thread, then the action is executed immediately. If the current thread is not the UI thread, the action is posted to the event queue of the UI thread.

如果当前线程是UI主线程，则直接执行Runnable的代码；否则将Runnable post到UI线程的消息队列。

Parameters

action	the action to run on the UI thread

Activity.java中：

[java] view plain copy

publicfinalvoidrunOnUiThread(Runnableaction){
if(Thread.currentThread()!=mUiThread){
mHandler.post(action);//将RunnablePost到消息队列，由内部的mHandler来处理，实际上也是Handler的处理方式
}else{
action.run();//已经在UI线程，直接运行。
}
}

Android:UI更新方法四:在Worker Thread中runOnUiThread直接刷新UI

Android:UI更新方法四:在Worker Thread中runOnUiThread直接刷新UI

public final voidrunOnUiThread(Runnableaction)

Parameters

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