Handler实例
子类需要继承Hendler类，并重写handleMessage(Message msg) 方法,用于接受线程数据，主要看具体实例，重要的部分都已给了注释：
public class MainActivity extends Activity {
/** Called when the activity is first created. */
private WebView wv =null;
private Handler h = new Handler();
public final String TAG = "UNISDP";
public final String MY_LOG = "my_log";
MyHandler myHandler;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
wv = (WebView) findViewById(R.id.web);
WebSettings webSettings = wv.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setSaveFormData(false);
webSettings.setSavePassword(false);
webSettings.setSupportZoom(false);
wv.addJavascriptInterface(new runJavaScript(), "myjs");
wv.loadUrl(sdFilePath);
myHandler = new MyHandler(); // 当创建一个新的Handler实例时, 它会绑定到当前线程的消息队列中,开始分发数据
MyThread m = new MyThread();
Thread getDataFromServer_thread = new Thread(m);
getDataFromServer_thread.start();
}
//----取数据线程 从 服务器获取数据
class MyThread implements Runnable
{
public void run()
{
Message msg ;
Bundle b ;
while(true)
{
try
{
Thread.sleep(1000);
msg = new Message();
b = new Bundle();// 存放数据
b.putString("value", "发送给UI线程的数据...");
msg.setData(b);
MainActivity.this.myHandler.sendMessage(msg); // 向Handler发送消息,更新UI
}
catch (InterruptedException e)
{
e.printStackTrace();
}
}
}
}
// 接受消息,处理消息 ,此Handler会与当前主线程一块运行
class MyHandler extends Handler
{
public MyHandler()
{
}
public MyHandler(Looper L)
{
super(L);
}
// 子类必须重写此方法,接受数据
@Override
public void handleMessage(Message msg)
{
super.handleMessage(msg);
// 此处可以更新UI
Bundle b = msg.getData();
String strValue = b.getString("value");
//MainActivity.this.button.append(color);
Log.i(MY_LOG,strValue);
}
}
}
