【Android Trick 3】获取网络状态并进入设置

关键字：网络状态，系统设置，系统时间，时间格式化

首先是判断系统的网络状态

/**
* 对网络连接状态进行判断
* @return true, 可用； false， 不可用
*/
private boolean isOpenNetwork() {
	ConnectivityManager connManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
	if (connManager.getActiveNetworkInfo() != null) {
		return connManager.getActiveNetworkInfo().isAvailable();
	}

	return false;
}

PS：你肯定要加入网络访问的权限

 <uses-permission android:name="android.permission.INTERNET"></uses-permission>
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

如果没有网络则进入设置界面

if (isOpenNetwork() == true) {
			
			
} else {
	AlertDialog.Builder builder = new AlertDialog.Builder(
					SomeActivity.this);
	builder.setTitle("title")
			.setMessage("message");
	builder.setPositiveButton(resources.getString(R.string.ok),
		new DialogInterface.OnClickListener() {
		@Override
		public void onClick(DialogInterface dialog, int which) {
			Intent intent = null;

			try {
				String sdkVersion = android.os.Build.VERSION.SDK;
				if (Integer.valueOf(sdkVersion) > 10) {
					intent = new Intent(
					android.provider.Settings.ACTION_SETTINGS);
				} else {
					intent = new Intent();
					ComponentName comp = new ComponentName(
						"com.android.settings",
						"com.android.settings.Settings");
					intent.setComponent(comp);
					intent.setAction("android.intent.action.VIEW");
				}
					SomeActivity.this.startActivity(intent);
			} catch (Exception e) {
				Log.v("LOG","open network settings failed, please check...");
				e.printStackTrace();
				}
			}
		})
		.setNegativeButton(resources.getString(R.string.no),
			new DialogInterface.OnClickListener() {
			@Override
			public void onClick(DialogInterface dialog,int which) {
				dialog.cancel();
				finish();
			}
		}).show();
}

这里再引申一下，通过android.provider.Settings可以获取很多我们需要的和系统设置相关的信息，比如系统时间是24还是12制

ContentResolver cv = this.getContentResolver();  
       String strTimeFormat = android.provider.Settings.System.getString(cv,  
                                          android.provider.Settings.System.TIME_12_24);        
       if(strTimeFormat.equals("24"))  
      {  
              Log.i("activity","24");  
       } 

额。。这篇博客写得比较杂，那就把时间格式化，获取系统时间也补上吧

SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM");  //参数为你想要显示的时间格式   
String date=sdf.format(new java.util.Date()); 

利用Calendar获取

Calendar c = Calendar.getInstance();  
取得系统日期:year = c.get(Calendar.YEAR)  
               month = c.grt(Calendar.MONTH)  
               day = c.get(Calendar.DAY_OF_MONTH)  
取得系统时间：hour = c.get(Calendar.HOUR_OF_DAY);  
                  minute = c.get(Calendar.MINUTE)  
                    Calendar c = Calendar.getInstance();  
取得系统日期:year = c.get(Calendar.YEAR)  
                   month = c.grt(Calendar.MONTH)  
                   day = c.get(Calendar.DAY_OF_MONTH)  
取得系统时间：hour = c.get(Calendar.HOUR_OF_DAY);  
                     minute = c.get(Calendar.MINUTE)  

利用Time获取

Time t=new Time(); // or Time t=new Time("GMT+8"); 加上Time Zone资料。  
t.setToNow(); // 取得系统时间。  
int year = t.year;  
int month = t.month;  
int date = t.monthDay;  
int hour = t.hour; // 0-23  
int minute = t.minute;  
int second = t.second;