android开发之Handler android开发之Handler

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; 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(); }

取数据线程从页游服务器获取数据

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.thiswww.sangpi.commyHandler.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 = https://www.it610.com/article/b.getString("value"); //MainActivity.this.button.append(color); Log.i(MY_LOG,strValue); } }

【android开发之Handler】}