static使用实例

public class LocationActivity extends Activity {      //一个Activity传值到service
    public static String workid = null;

protected void onStart() {

LocationActivity.workid = new SimpleDateFormat("MMddHHmm").format(date);

                    Intent idintent = new Intent(LocationActivity.this, MyLocationService.class);
                    idintent.putExtra("workid", LocationActivity.workid);
                    startService(idintent);
}
}

public class MyLocationService extends Service {       //一个Service
    public static String workid;         //声明一个static变量，在Service类加载时创建。

public void onStart(Intent intent, int startid) {      //onstart方法

MyLocationService.workid = intent.getStringExtra("workid");          //直接用类名+"."调用static型变量
}
}