Online assignment 3 of mobile Internet technology in the 20th autumn of electronic technology [standard answer]

20 autumn 《 Mobile Internet technology 》 Online homework 3
1.[ Single topic selection ]android:completionThreshold=1 Properties of which component ？（）
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A.ImageButton
B.EditText
C.TextView
D.AutoCompleteTextView
answer :——D——
2.[ Single topic selection ] Common event descriptions about view controls , What's not right is ()
A.Click Events can only be used on buttons , Indicates the click action of the button
B. When TextView When a class view control loses focus or gains focus , Will trigger FocusChange event
C. When an option in the radio box is selected , Will trigger CheckedChange event
D. When an option in the multi selection box is selected , Will trigger CheckedChange event
answer :——A——
3.[ Single topic selection ] stay Activity In the life cycle of , When it changes from visible state to translucent state , Which method of it must be called ？（）
A.onStop（）
B.onPause（）
C.onRestart（）
D.onStart（）
answer :——B——
4.[ Single topic selection ] Which of the following options is not Activity How to start ？（）
A.goToActivity
B.startActivity
C.startActivityFromChild
D.startActivityForResult
answer :————
5.[ Single topic selection ] Which attribute in the progress bar sets the size format of the progress bar ？（）
A.android:secondaryProgress
B.android:progress
C.android:max
D.style
answer :————
6.[ Single topic selection ] Which of the following mobile devices is equipped with Android platform ？（）
A.NOKIA mobile phone
B. Mi phones
C.iPhone mobile phone
D.iPad
answer :————
7.[ Single topic selection ] The following is used to display a series of images ？（）
A.ImageView
B.Gallery
C.ImageSwitcher
D.GridView
answer :————
8.[ Single topic selection ] In the table layout ,android:collapseColumns=”1,2″ The meaning is ？（）
A. On the screen , When the columns of the table can be displayed , Show 1,2 Column
B. On the screen , When the columns of the table cannot be completely displayed , Fold
C. On the screen , Whether it can be displayed or not , Fold 1、2 Column
D. On the screen , Dynamically decide whether to display the table
answer :————
9.[ Single topic selection ] What is incorrect about threads is （）
A. stay android in , We can in the main thread , Create a new thread
B. In the new thread created , It can operate UI Components
C. New threads can work with Handler The common use
D. Created Handler object , It belongs to the thread that created it
answer :————
10.[ Single topic selection ] Which of the following options does not belong to AdapterView Class ？（）
A.ListView
B.Spinner
C.GridView
D.ScrollView
answer :————
11.[ Single topic selection ] About res/raw The correct statement in the table of contents is ？（） University of Electronic Science and technology answer q Or come in
A. The files here are intact, stored on the device and converted to binary format
B. The files here are finally stored in binary format in the specified package
C. The files here are stored intact on the device and will not be converted to binary format
D. The files here will not be stored in binary format in the specified package
answer :————
12.[ Single topic selection ] The way to create a submenu is ？（）
A.add
B.addSubMenu
C.createSubMenu
D.createMenu
answer :————
13.[ Single topic selection ] The following statement is wrong ？（）
A.Button It is a common button component , In addition, there are other button components
B.TextView Is a component that displays text ,TextView yes EditText Parent class of
C.EditText Is a component for editing text , have access to EditText Enter specific characters
D.ImageView It is a component that displays pictures , You can display partial pictures by setting
answer :————
14.[ Single topic selection ] About implicit Intent The right is ？（）
A.android Use in IntentFilter To find the implicit Intent Related objects
B. Look for and by the name of the component intent Associated objects
C. Implicit Intent More for delivering messages inside applications
D. A statement IntentFilter The component of can only respond implicitly Intent request
answer :————
15.[ Single topic selection ] About android process , What is not true is （）
A. The process in which the component runs , By androidmanifest.xml decision , It can specify which process the component runs in
B. When memory is needed ,android Will decide to shut down those idle processes first
C. The background process is invisible to the user Activity, But it may also be seen by users , So it can't be killed
D. Visual processes are generally not killed by the system
answer :————
16.[ Single topic selection ] Which of the following does not belong to Activity Life cycle approach to （）
A.onInit()
B.onStart()
C.onStop()
D.onPause()
answer :————
17.[ Single topic selection ] stay android Use in RadioButton when , The components needed to realize mutual exclusion are ？（）
A.ButtonGroup
B.RadioButtons
C.CheckBox
D.RadioGroup
answer :————
18.[ Single topic selection ] stay Activity in , How to get service object ？（）
A. It can be obtained by direct instantiation .
B. You can get by binding .
C. adopt startService()
D. adopt getService() obtain
answer :————
19.[ Multiple choice ] stay android Use in SQLiteOpenHelper This auxiliary class is , What operations might generate a database ？（）
A.getReadableDatabase()
B.getWriteableDatabase()
C.getAbleDatabase()
D.getDatabase()
answer :————
20.[ Multiple choice ] stay android Use in SQLiteOpenHelper This auxiliary class is , You can create a database , And the way to manage the database version can be ？（）
A.getDatabase()
B.getWriteableDatabase()
C.getReadableDatabase()
D.getAbleDatabase()
answer :————