I want to get a pressed character in the code without using edittext.
Simply a black screen appear if someone presses "a" or "b" etc.. I want to get this value in my code.
I have done it using editext and textwatcher but the requirement is we don't need to use them now.
Can we make character(alphabet) moving from top to bottom randomly
I have followed some links which have used marquee but it does not work.
In your Activity override the method
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_A) {
//Here your black screen if you press A
return true;
}
return super.onKeyDown(keyCode, event);
}
Check this KeyEvent ;
Related
how to know when I press the delete key from the soft keyboard in android, an event the content of the edittext is empty. I know when the content is not empty, can use TextChangeListener. Only the empty content how to listen the pressed key.
KeyEvent provides keyboard events
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
// Do Code here
}
return super.onKeyDown(keyCode, event);
}
setListener is not worked in same android system. Finally I got a smart idea, which can use a space replace by ImageSpan，and set picture size is 0*0. So there always will not be empty.
Is it possible to override all the buttons in the Android navigation bar?
Is it maybe possible to add a new button?
How can I change the appearance of the buttons? I want to set an other background bitmap.
I am using a Nexus 7.
I just know onBackPressed() but what about the other two buttons?
And how are they called?
I think that you need to override this methode !
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK){
OnClick click = new OnClick();
click.onClick(findViewById(R.id.btn_cancel));
}
return super.onKeyDown(keyCode, event);
}
I just used this methode to handle save event for my form and you can use to handle pushing other keys using KeyEvent parameters.
Good luck.
My application is set up using ViewFlipper so that I have one main View which links to three other Views, each through their own button. As I've set it up this way, when I'm on one of the three other Views if I press the back button on my android device it backs all the way out of the app. I Just wanted to know if it was possible to map it to just go back to the main View?
Override onKeyDown() :
#Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
if (keyCode == KeyEvent.KEYCODE_BACK)
{
//Place your code here!
}
return true;
}
When I press the search key on my device, I want it to show a white background. However, when I press the back button, I want the previous activity's background to be restored. ivBackground is a variable I added to my relativelayout which I turn VISIBLE to show the white background.
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_SEARCH) {
ivBackground.setVisibility(View.VISIBLE);//WHITE IMAGEVIEW
return false;
} else if (keyCode == KeyEvent.KEYCODE_BACK) {
ivBackground.setVisibility(View.GONE);
return true;
}
return super.onKeyDown(keyCode, event);
}
While the above code works, the problem is that when I press the back button, the white screen still remains. It only goes away if I press the back button once again. Any solutions?
On the relevant activity, you can get a reference to a SearchManager object. On this, you can set an OnDismissListener, which is called the when search UI is dismissed e.g.
this.searchMgr = (SearchManager)this.getSystemService(Context.SEARCH_SERVICE);
this.searchMgr.setOnDismissListener(new OnDismissListener() {
public void onDismiss() {
ivBackground.setVisibility(View.GONE);
}
});
To make the white background visible, you can override onSearchRequested inside your activity class, which is called when a user signals the desire to start a search
#Override
public boolean onSearchRequested() {
ivBackground.setVisibility(View.VISIBLE);
return super.onSearchRequested();
}
Hope this helps!
How about setting a SearchView.OnCloseListener or a SearchManager.OnDismissListener that also hides your view? This seems like the right solution anyway since the two events are logically connected. If you later dismiss the search view programmatically for example, you don't have to worry about separately dismissing the background view.
Right now when you hold down the menu button on my android device it pulls up a soft keyboard.Is there a way to override this? I would rather choose what happens on a long touch of this button.
When using onKeyLongPress it only detects when the "Back" button is held down. How can I make this work for the menu button?
For this, you can use the onKeyLongPress()-method, offered by the KeyEvent.Callback-class (can be used in Activity's too, since they are a subclass of the KeyEvent.Callback-class).
There is also a little trick to make this work: You'll have to tell Android to track a long-press click on the "Menu"-button as the onKeyLongPress()-method will not be triggered otherwise. This is done in the normal onKeyDown()-method.
So your code might look like this:
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_MENU) {
// this tells the framework to start tracking for
// a long press and eventual key up. it will only
// do so if this is the first down (not a repeat).
event.startTracking();
return true;
}
return super.onKeyDown(keyCode, event);
}
#Override
public boolean onKeyLongPress(int keyCode, KeyEvent event){
if (keyCode == KeyEvent.KEYCODE_MENU){
// Do what you want...
Toast.makeText(this, "I'm down!", Toast.LENGTH_SHORT).show();
return true;
}
return super.onKeyLongPress(keyCode,event);
}
A great article with further informations can be found on the Android Developer Blog.