小编use*_*673的帖子

我需要插入"<<" android:text = "<<"但是存在问题:

Multiple annotations found at this line:
    - [I18N] Hardcoded string "<<", should use @string resource
    - The value of attribute "android:text" associated with an element type "Button" must not contain the '<' 
     character.

你能告诉我如何<<在xml文件中插入文件TextView吗？

我需要检查Android中是否有互联网,所以我尝试使用以下功能:

boolean b_IsConnect = isNetworkAvailable();
private boolean isNetworkAvailable() {
  ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
  NetworkInfo activeNetworkInfo = connectivityManager
    .getActiveNetworkInfo();
  return activeNetworkInfo != null;
}

我还在清单中添加了所需的权限:

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" >
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>

但它仍然抛出异常:

05-02 16:05:26.226: E/AndroidRuntime(481): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.housedisplay/com.housedisplay.RssActivity}: java.lang.SecurityException: ConnectivityService: Neither user 10038 nor current process has android.permission.ACCESS_NETWORK_STATE.
05-02 16:05:26.226: E/AndroidRuntime(481):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1736)
05-02 16:05:26.226: E/AndroidRuntime(481):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1752)
05-02 16:05:26.226: E/AndroidRuntime(481):  at android.app.ActivityThread.access$1500(ActivityThread.java:123)
05-02 16:05:26.226: E/AndroidRuntime(481):  at …

我想找出当前系统时间与插入数据和时间之间的差异String.我试过这个:

 try {

            String strFileDate = "2012-04-19 15:15:00";
            DateFormat formatter2 = new SimpleDateFormat("yyyy-mm-dd hh:mm:ss");
            Date date = formatter2.parse(strFileDate);
            long difference = date.getTime() - System.currentTimeMillis();
            Calendar calendar = Calendar.getInstance();
            calendar.setTimeInMillis(difference);
            Toast.makeText(getBaseContext(),
                    formatter2.format(calendar.getTime()), Toast.LENGTH_LONG)
                    .show();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } 

但它没有给我正确的结果.我做得对吗？

更新

我试着跟着::

String strFileDate = "2012-04-19 15:15:00";
            DateFormat formatter2 = new SimpleDateFormat("yyyy-mm-dd hh:mm:ss");
            Date date = formatter2.parse(strFileDate);
            long diffInMs = date.getTime()
                    - new Date(System.currentTimeMillis()).getTime();

            long diffInSec = TimeUnit.MILLISECONDS.toSeconds(diffInMs);

            long hour = diffInSec …