How to realize Keyboard Operation in Android
This article mainly introduces the relevant knowledge of "how to achieve keyboard operation in Android". The editor shows you the operation process through an actual case. The operation method is simple, fast and practical. I hope this article "how to achieve keyboard operation in Android" can help you solve the problem.
Generally speaking, there are three functions for Android keyboard operation:
OnKeyDown, onKeyUp, on, onKeyMultiple
See the following Android keyboard operation code:
Import android.app.Activity
Import android.app.ProgressDialog
Import android.os.Bundle
Import android.view.KeyEvent
Import android.view.Menu
Import android.view.MenuItem
Import android.widget.TextView
Public class TestProgress extends Activity {
Private ProgressDialog progress = null
@ Override
Public void onCreate (Bundle savedInstanceState) {
Super.onCreate (savedInstanceState)
SetContentView (R.layout.main)
}
@ Override
Public boolean onCreateOptionsMenu (Menu menu) {
Super.onCreateOptionsMenu (menu)
Menu.add (0, Menu.FIRST+1, 1, "Open Progress")
Menu.add (0, Menu.FIRST+2, 2, "Exit")
Return true
}
@ Override
Public boolean onOptionsItemSelected (MenuItem item) {
Super.onOptionsItemSelected (item)
Switch (item.getItemId ())
{
Case Menu.FIRST + 1:
{
Progress = new ProgressDialog (this)
Progress.setTitle ("Progressgiving!")
Progress.setMessage ("Please wait for the operation...")
Progress.setCancelable (true)
Progress.show ()
/ / progress = ProgressDialog.show (this, "Progress!"
"Please wait for operation...")
Break
}
Case Menu.FIRST + 2:
{
Finish ()
Break
}
}
Return true
}
@ Override
Public boolean onKeyDown (int keyCode, KeyEvent event) {
/ / TODO Auto-generated method stub
Super.onKeyDown (keyCode, event)
SetTitle ("you pressed key:" + String.valueOf (keyCode))
Return true
}
@ Override
Public boolean onKeyMultiple (int keyCode, int repeatCount
KeyEvent event) {
/ / TODO Auto-generated method stub
Super.onKeyMultiple (keyCode, repeatCount, event)
TextView tv = (TextView) this.findViewById (R.id.mainview)
Tv.setText ("you have press key: [" + String.valueOf (keyCode) + "]
For: "+ String.valueOf (repeatCount) +" Times! ")
Return true
}
@ Override
Public boolean onKeyUp (int keyCode, KeyEvent event) {
/ / TODO Auto-generated method stub
Super.onKeyUp (keyCode, event)
SetTitle ("you release key:" + String.valueOf (keyCode))
Return true
}
}
This is the end of the introduction on "how to operate the keyboard in Android". Thank you for your reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.
