Beginner Android Development

Because the company boss said he wanted to make a payment app on the POS, then the task was so enjoyable for me.

I started looking for Android development data learning, development tools just started to decide to use eclipse, a variety of configurations are blindfolded, Android SDK download, wow ...

Later decided to use Android Studio

After the installation is started, configure SDK,JDK or the new project opens, he will automatically download the SDK and download it directly to the system tray.

Android Virtual machine Notebook is not powerful to use the real machine test, the use of virtual machine too much space!

Create a new project change the name of the app

Then practice this control, it is recommended to write in text mode

Android:layout_width= "Match_parent"   represents the width of the control that fills the entire parent control (how wide the screen is and how wide it is, and the most visible control is displayed when there are multiple controls on the horizontal layout)

Android:layout_width= "Wrap_content"   represents the width of the control itself (the control has its own width, but you can also specify a width of **DP)

Android:layout_width= "0DP"  means that the control has no width, but you have a different control on the horizontal layout, his display takes up all the remaining width, and when you have a horizontal layout with two or three widths of 0DP controls, he will split the width of the entire parent control.

Android:id= "@+id/tab_bottom1"   this ID is the name of the control you want to manipulate (just like your id)

Android:background= "#aac6e3" the  background color of this control, you can use the picture when the background (android:background= "@mipmap/sk")

android:visibility= "visible"  this control is displayed on the parent control invisible The representative does not display but occupies a position gone the non-  occupied position is not displayed

android:gravity= "Center|left" means that the word in this control is centered left and right, either up or down.

android:text= "1" The  contents of this control

Android:textsize= the  size of the font inside the "20SP" control

Android:textstyle= the weight of the font inside the "bold" control

Android:clickable= "True" this control can be clicked false not clickable

app:layout_constrainttop_tobottomof= "@+id/tabe_button5"  at the top of this control at the bottom of the ID tabe_button5 control and so on top bottom bottom Right  Left

app:layout_constraintleft_toleftof= "Parent" the left part of  This control is in the left part of the parent control

Later slowly update  the above has the understanding of the wrong welcome advice

Initial Android Development