Android keyboard monitoring operation mechanism "see the nature of keyboard Monitoring" "Introductory version"

Take EditText as an example:

1.Activity itself also has the key monitoring EditText key monitoring and Activity key monitoring relationship:

activity itself also has a button to listen and tap and release two event monitoring
EditText button monitoring is not divided, and released, accurately said: It put these two events in a monitoring event.


return false, after the EditText key listener event is executed, it will go down, that is, then the activity of the key monitoring
Return true: Terminates down pass and does not perform activity's keystroke monitoring
2. Soft keyboard does not respond to keystroke monitoring (physical keyboard only)

(There is no physical button on the smartphone (except for the 3 physical keys below the back key Home key))

Set up keyboard monitoring


Username.setonkeylistener (New Onkeylistener () {


@Override
public boolean OnKey (View v, int keycode, keyevent event) {
TODO auto-generated Method Stub
Switch (keycode) {
Case Keyevent.keycode_1:
Toast.maketext (mainactivity.this, "You pressed 1", 1). Show ();


Break
Case Keyevent.keycode_button_b:
Toast.maketext (mainactivity.this, "you pressed B", 1). Show ();
Break
Default
Break
}
return false;
}
});

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Android keyboard monitoring operation mechanism "see the nature of keyboard Monitoring" "Introductory version"