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文本文件读写助手：创建、追加一行、读最后一行、统计行数（附 .aia 源码）...
...样的相对路径，文件就落在 App 专属目录 /storage/emulated/0/Android/data/包名/files/notes/日记.txt：
不需要任何存储权限，Android 10 以后也能正常读写——「无法保存文件 / 无法创建文档」多半是写到了 /sdcard/xxx.txt 这种共享目录被系...
How to pop an alert message box using PHP?
...
You could use Javascript:
// This is in the PHP file and sends a Javascript alert to the client
$message = "wrong answer";
echo "<script type='text/javascript'>alert('$message');</script>";
...
What's the difference between Thread start() and Runnable run()
...ing) thread. No thread creation.
R1 r1 = new R1();
R2 r2 = new R2();
r1 and r2 are just two different objects of classes that implement the Runnable interface and thus implement the run() method. When you call r1.run() you are executing it in the current thread.
Second example: Two separate thr...
Meaning of 'const' last in a function declaration of a class?
...method the this pointer will essentially become a pointer to const object, and you cannot therefore change any member data. (Unless you use mutable, more on that later).
The const keyword is part of the functions signature which means that you can implement two similar methods, one which is called ...
How to create a drop-down list?
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Best way to do it is:
Preview:
XML:
<Spinner
android:id="@+id/spinner1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:drawable/btn_dropdown"
android:spinnerMode="dropdown"/>
Java:
//get the sp...
Printing Java Collections Nicely (toString Doesn't Return Pretty Output)
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You could convert it to an array and then print that out with Arrays.toString(Object[]):
System.out.println(Arrays.toString(stack.toArray()));
share
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imp...
How to remove all of the data in a table using Django
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While this answers the first question, it doesn't handle the second question. I would use 'DELETE FROM %s' % (table_name, ) for that bit, leaving the table empty but intact.
– user3934630
Aug 7 '15 at 21:43
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Get name of currently executing test in JUnit 4
...ly newer versions of JUnit execute @Rule before @Before - I'm new to JUnit and was depending on TestName in my @Before without any difficulties.
– MightyE
Apr 16 '10 at 11:36
9
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How to pass variable number of arguments to a PHP function
...unction that takes a variable number of arguments (using func_num_args() and func_get_args() ), but the number of arguments I want to pass the function depends on the length of an array. Is there a way to call a PHP function with a variable number of arguments?
...
How to format numbers by prepending 0 to single-digit numbers?
... store the sign, apply the formatting to the absolute value of the number, and reapply the sign after the fact. Note that this method doesn't restrict the number to 2 total digits. Instead it only restricts the number to the left of the decimal (the integer part). (The line that determines the sig...