Give your buttons some behavior.
change the foreground color of the Button that was clicked. Choose at random
among Color.RED, Color.BLUE, Color.YELLOW, etc. To change the color of the
Button, call setTextColor on the Button that is passed to the event handler. However, note
that although Button has a setTextColor method, View (the parent class of Button) does
not. So, you have to cast the View to Button before calling setTextColor.
cast your view by button and find its Id by using findview_by_id , then set the color...
(Button)view.findviewbyid(R.id.btn_id).setTextColor();
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_stack);
mainView=(RelativeLayout)findViewById(R.id.rel);
final Button redButton=new Button(this);
redButton.setText("Click");
redButton.setTextColor(Color.RED);
redButton.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
redButton.setTextColor(Color.GREEN);
}
});
mainView.addView(redButton);
}
Related
Well, I developed a menu with eight Buttons for an App. So, every time the user clicks on in one of the buttons, such button changes its background. And I would would like to change its color as well. But I got now idea how, since setTextColor does not work with Views.
I'm using View because its part of onClick method that I override in order to achieve what I want. So, here go the code:
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
v.setBackgroundResource(R.drawable.degrade_menu);
}
So, how could I change the text color?
Cheers,
Cast your v to TextView and then set the text color. Do not forget to read color from resourse
((TextView)v).setTextColor(getResources().getColor(R.color.errorColor));
quick solution:
final Button button = (Button) findViewById(<id>);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
button.setTextColor(<color>);
}
};
better solution: use states
Cast the view to a button. Then you can use settextcolor
I am busy creating an app. I succeeded in creating the button with a custom font and all. Now what I'd want is that when I click the button, it must disapear, the background color of the view must randomely change and text must be loaded from an database.
How does one go about this?
Matthew
Well, the disappearing can be make like this:
public class MyActivity extends Activity {
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.content_layout_id);
final Button button = (Button) findViewById(R.id.button_id);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click - Disappear in your case...
v.setVisibility(View.INVISIBLE); //can be View.GONE as well...
}
});
}
}
Then for the background I guess you can create an array with all the colors you want (or something that generates a random HEX code) and then do setBackground(X) where X is the HEX code that you just generated... You need to specify more about the database part though.
I am trying to pass an imagebutton as a reference through an indexed array.
I thought I could set the ID and then pass that ID as such:
MyButton=(ImageButton) findViewById(R.id.imageButton1);
MyButton.setId(0);
Then in my onClick I want to pass index "0":
MyButton.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
if (MyButton.isSelected()){
Switch_Ctrl(0, OFF );
}
});
index is passed to method:
boolean Switch_Ctrl(char button_num, byte state){
button_num.setImageResource(R.drawable.switch_off);
button_num.setSelected(false);
}
I get error can't resolve method setImageResource.
So I can't use the id "button_num". Not sure how I can reference the ImageButton?
You can just store a reference to the button and change it onClick. Just make it an instance variable in your Activity or Fragment. You can declare a button seperately and then initialize it onCreate or onActivityCreated (once findViewById has become available). For example
private Button myButton;
#Override
protected void onCreate(Bundle savedInstanceState){
myButton = (Button) findViewById(R.id.button);
myButton.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
changeButtonBackground(v.getId());
});
}
}
//if doing this for multiple butons, check which one
//was pressed and change the background
private void changeButtonBackground(int id){
if(id == R.id.myButton){
myButton.setBackground(R.drawable.whatever);
}
}
Also - I wouldn't set the id of my button to anything else like 0. Your button already has an id, it's the one you defined in the XML as android:id="#+id/whateveritis". Unless you are creating view's programatically that do not exist in the XML (e.g. if you were adding TextView's to some parent layout on click of this button) you don't need to define a new id.
I have this problem with my ToggleButton.
I want it to create/delete a button upon being toggled, and at the same time add content/functions to the button, like drawable and such.
This is the current code:
public class BillardScoreboardActivity extends Activity {
/** Called when the activity is first created. */
Button minuskegle, minuskugle, pluskugle, pluskegle, plusmidkegle, minusmidkegle, miss;
ToggleButton toggle;
LinearLayout bottomlayout;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
toggle = (ToggleButton) findViewById(R.id.bRedGreen);
toggle.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
pluskugle = (Button) findViewById(R.id.bBallhole);
minuskugle = (Button) findViewById(R.id.bBallhole);
pluskegle = (Button) findViewById(R.id.bKegle);
minuskegle = (Button) findViewById(R.id.bKegle);
plusmidkegle = (Button) findViewById(R.id.bKeglemid);
minusmidkegle = (Button) findViewById(R.id.bKeglemid);
bottomlayout = (LinearLayout) findViewById(R.id.bottomlayout);
miss = (Button) findViewById(R.id.bMiss);
if(toggle.isChecked())
{
minuskugle.setBackgroundResource(R.drawable.redballinhole);
minuskegle.setBackgroundResource(R.drawable.redkegle);
minusmidkegle.setBackgroundResource(R.drawable.midkegleminus);
miss.setBackgroundResource(R.drawable.missbutton);
miss.setVisibility(View.VISIBLE);
}
else
{
pluskugle.setBackgroundResource(R.drawable.whiteballinhole);
pluskegle.setBackgroundResource(R.drawable.kegleb);
plusmidkegle.setBackgroundResource(R.drawable.midkegleplus);
miss.setVisibility(View.GONE);
}
}
});
}
The current problem is that it can't find the (buttontest) in this part of the code:
else
{
pluskugle.setBackgroundResource(R.drawable.whiteballinhole);
pluskegle.setBackgroundResource(R.drawable.kegleb);
plusmidkegle.setBackgroundResource(R.drawable.midkegleplus);
bottomlayout.removeView(buttontest);
}
And as mentioned earlier, the second problem is to make the button inherit some functions/content.
for bigger version: http://i.imgur.com/KxKvh.png
Btw... Everytime i start up the application, it gives me 2 apps to choose between, whereof only the bottom one works:
I guess the problem is that the togglebutton's initial state is 'checked'. That means when you click it the first time, isChecked() will return false and the else-part of your code will be executed. But at that point, buttontest hasn't been added to bottomlayout yet.
I recommend you to have the button inside the layout by default and call buttontest.setVisibility(View.GONE) when you would like to hide it and buttontest.setVisibility(View.VISIBLE) when it needs to be shown.
As for your second question, just call setBackgroundResource/Drawable to add content (like you're already doing it with the other buttons). If you say you want to add functionality, I assume you intend to do something when the button is clicked? If yes, add a View.OnClickListener.
Hope I could help you.
I have a TextView with the android:onClick attribute. When clicked, the TextView disappears. I don't want the TextView to disappear when clicked. Any ideas?
Edit:
<TextView android:id="#+id/textView1"android:text="Click Me!"
android:layout_width="wrap_content"
android:layout_height="wrap_content" android:onClick="processClick"
android:clickable="true"/>
http://i1179.photobucket.com/albums/x386/jenningsr2006/unclicked.png
http://i1179.photobucket.com/albums/x386/jenningsr2006/clicked.png
Edit
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.example);
TextView t = (TextView)findViewById(R.id.textView1111);
t.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v)
{
// Do some job here
Toast.makeText(getApplicationContext(), "Clicked", Toast.LENGTH_SHORT).show();
}
});
Clicking it does the operation correctly, that's not the problem. When I "mousedown" on the TextView, it disappears, then reappears on "mouseup".
I thought I had the same problem but it turned out the textview was not dissapearing, rather the color was changing so that it was the same as the background color. Thus it appeared hidden but it really was there. You can set the clicked color of the text view by setting it's color state list resource
http://developer.android.com/guide/topics/resources/color-list-resource.html
Have you registered a method processClick? There is no need to do it this way. Remove the clickable property and also onClick property. More simple approach is to set onClick listener from the code, for example in onCreate method:
TextView text = (TextView) findViewById(textView1);
text.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v)
{
// Do some job here
}
});
The view becomes clickable automatically when you set an on click listener. Good luck