src- Java source files associated with your project. This includes the Activity "controller" files as well as your models and helpers.res- Resource files associated with your project. All graphics, strings, layouts, and other resource files are stored in the resource file hierarchy under the res directory.res/layout- XML layout files that describe the views and layouts for each activity and for partial views such as list items.res/values- XML files which store various attribute values. These include strings.xml, dimens.xml, styles.xml, colors.xml, themes.xml, and so on.res/drawable- Here we store the various density-independent graphic assets used in our application.- The most frequently edited files are:
res/layout/activity_foo.xml- This file describes the layout of the activity's UI. This means the placement of every view object on one app screen.src/.../FooActivity.java- The Activity "controller" that constructs the activity using the view, and handles all event handling and view logic for one app screen.AndroidManifest.xml- This is the Android application definition file. It contains information about the Android application such as minimum Android version, permission to access Android device capabilities such as internet access permission, ability to use phone permission, etc.
Other less edited folders include:gen- Generated Java code files, this library is for Android internal use only.assets- Uncompiled source files associated with your project; Rarely used.bin- Resulting application package files associated with your project once it’s been built.libs- Before the introduction of Gradle build system, this directory was used for any secondary libraries (jars) you might want to link to your app.
Variables The main way to store information in the middle of a PHP program is by using a variable. Here are the most important things to know about variables in PHP. All variables in PHP are denoted with a leading dollar sign ($). The value of a variable is the value of its most recent assignment. Variables are assigned with the = operator, with the variable on the left-hand side and the expression to be evaluated on the right. Variables can, but do not need, to be declared before assignment. Variables in PHP do not have intrinsic types - a variable does not know in advance whether it will be used to store a number or a string of characters. Variables used before they are assigned have default values. PHP does a good job of automatically converting types from one to another when necessary. PHP variables are Perl-like. PHP has a total of eight data types which we use to construct our variables − Integers − are whole numbers, without a decima...
Comments
Post a Comment