Handler onlineHandler = new Handler() {

        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.arg1) {
                case 0: {
                    home_0.setImageResource(R.drawable.home_2_style);
                    break;
                }
                case 1: {
                    home_0.setImageResource(R.drawable.home_2_status_style);
                    break;
                }
            }
            home_0.postInvalidate();
        }

    };

   Runnable onlineRunnable = new Runnable() {

        @Override
        public void run() {
            Message m = new Message();
            if (readRd() != null && readRd().trim().equals("0")) {
                m.arg1 = 0;
            } else {
                m.arg1 = 1;
            }
            onlineHandler.sendMessage(m);
//每隔5秒执行一次
            onlineHandler.postDelayed(onlineRunnable, 5000);
        }

onlineHandler.post(onlineRunnable);

要实现activity的跳转，除了创建一个activity类外，必须在
AndroidManifest.xml文件里做声明。例如

<application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".ApiDemos" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".EditorFrame"/>

其中ApiDemos和EditorFrame是创建的activity对象

Intent intent = new Intent(); Bundle bundle = new Bundle(); bundle.putString("txt2tags", txt2tags); intent .setClass(EditorFrame.this, ApiDemos.class);//EditorFrame 为当前界面的Activity，ApiDemos为要跳转的类 intent.putExtras(bundle); startActivity(intent);

之中bundle是用于activity之间传递参数

获得activity之间的参数

Bundle bundle=this.getIntent().getExtras(); strfromEditor=bundle.getString("txt2tags");

Activity的详细解析可以看

http://www.360doc.com/content/12/0410/13/7656232_202461086.shtml#

和

http://www.ibm.com/developerworks/cn/opensource/os-cn-android-actvt/

<result name="dayExcel" type="stream">
	<param name="contentType">application/vnd.ms-excel</param>
	<param name="contentDisposition">filename="export.xls"</param>
	<param name="bufferSize">1024</param>
</result>

	InputStream is;

	public String execute() {

		Label label;
		WritableWorkbook workbook;
		ByteArrayOutputStream os = new ByteArrayOutputStream();
		try {
			workbook = Workbook.createWorkbook(os);
			WritableSheet sheet = workbook.createSheet("Sheet1", 0);
			label = new jxl.write.Label(0, 0, "Time/Hour");
			sheet.addCell(label);
			for (int i = 0; i < 24; i++) {
				if (i < 10) {
					label = new jxl.write.Label(0, i+1, "0" + i);
					sheet.addCell(label);
				} else {
					label = new jxl.write.Label(0, i+1, String.valueOf(i));
					sheet.addCell(label);
				}
			}

			workbook.write();
			workbook.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
		is = new ByteArrayInputStream(os.toByteArray());
		return "excel";

	}

	public InputStream getIs() {
		return is;
	}

	public void setIs(InputStream is) {
		this.is = is;
	}

	public InputStream getInputStream() throws Exception {
		return is;
	}