开发中常用的代码块:一 隐藏软键盘的输入法 InputMethodManager mInputMethodManager = (InputMethodManager) context .getSystemService(Context.INPUT_METHOD_SERVICE); mInputMethodManager.hideSoftInputFromWindow(view.getWindowToken(), 0);
二:判断网络是否是好的 public static boolean isActiveNetwork(Context context) {
ConnectivityManager cManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfor = cManager.getActiveNetworkInfo();
if (netInfor != null && netInfor.isAvailable()) {
return true;
} else {
return false;
}
}
三: 数据单位的转换
/**
* 转化B到KB
*/
public static double transB2KB(long b) {
return b / 1024;
}
/**
* 转化KB到MB
*/
public static double transKB2M(double KB) {
return KB / 1024;
}
四: 确保文件目录存在
public static void checkFileDirectory(String path) {
if (path != null) {
File filePath = new File(path);
if (!filePath.exists()) {
filePath.mkdirs();
}
}
}
五:获取网络文件的总大小
public static Long getTotalSize(String url) {
Long totalSize = null;
try {
totalSize = NetworkUtil.getContentSize(url);
} catch (Exception e) {
totalSize = 0L;
e.printStackTrace();
}
return totalSize;
}
六:显示网络异常的提示
public static void showNetException(Context context) {
Toast.makeText(context,
context.getApplicationContext().getResources().getString(R.string.net_exception),
Toast.LENGTH_SHORT).show();
}
七:java将天数转换为毫秒数
public static long transDayToTime(long datCount) {
long time = datCount * 24 * 60 * 60 * 1000;
return time;
}
八:java 将毫秒数转换为天数
public static int transTimeToDay(long time) {
int day = (int) (time / (24 * 60 * 60 * 1000));
return day;
}
九:android判断应用是否是内置的
public static boolean isSystemApplication(Context context, String packageName) {
boolean isflag = false;
try {
PackageManager pm = context.getPackageManager();
ApplicationInfo pInfo = pm
.getApplicationInfo(packageName, PackageManager.GET_META_DATA);
if ((pInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
isflag = true;
}
} catch (Exception e) {
Log.i("xxxxx","Exception ");
}
return isflag;
}
十:判断字符串是否为空
public static boolean isNull(String string) {
if (string != null) {
string = string.trim();
if (string.length() != 0) {
return false;
}
}
return true;
}
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