I am making a hangman game, in the main Activity, there is a GridLayout containing the buttons for each letter.
I would like to set a Button array in java to include all of the buttons and access them (in order to use them in java methods, as my teacher instructed us). My question is, what would be the easiest way to identify the buttons in Java, and how can I add them to said Button array?
Thanks in advance. This is my first question here.
EDIT
The letters are not English letters and in this picture you can see the design of the GridLayout.
Notice that the language direction is RTL instead of LTR which means I used a reverse order of the columns.
So, in addition to my first question, is there any way to 'reverse' the numbers' order from LTR to RTL?
You don't need an array to identify the buttons. Use an array to identify just the buttons that was pressed.
If your button contains the letter as a text...:
<Button
android:id="#+id/alef_button"
...
android:text="א" />
<Button
android:id="#+id/bet_button"
...
android:text="ב" />
Then you can use the same method as a listener for all buttons:
public void onButtonClick(View view) {
Button pressedButton = (Button) view;
if("א".equals(pressedButton.getText())) {
putOnArray("alef");
} else if("ב".equals(pressedButton.getText())) {
putOnArray("bet");
} ...
}
Related
I have developed an Health App in Android, and i have an Activity where the first question is a Yes/No answer (i make with 2 checkboxes), depending the Yes/No answer the activity shows diferents EditText to complete. I really know how to hide EditText and how to show when the user click the checkboxes, but the question is if exist a correct design pattern to do this? i read the Material Desing web , but i didnt find nothing about this. It is correct way to do? Or i must enable/disable the EditTexts.
If you only need to set a few EditText's, your way is right.
OPTION A
Imagine that "foo()" returns which is the EditText that you have to show.
In your layout:
<EditText
android:id="#+id/edit1"
android:visibility="GONE"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<EditText
android:id="#+id/edit2"
android:visibility="GONE"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
....
Now, in your code:
...
switch(foo()){
case 1: //You have to show the first EditText
EditText edit1 = (EditText)findViewById(R.id.edit1);
edit1.setVisibility(View.VISIBLE);
break;
case 2: //You have to show the second EditText
EditText edit2 = (EditText)findViewById(R.id.edit2);
edit2.setVisibility(View.VISIBLE);
break;
....
}
OPTION B
Another choice would be adding the EditText programatically, something like:
EditText editText = new EditText(context); // Pass it an Activity or Context
editText.setLayoutParams(new LayoutParams(..., ...)); // Pass two args; must be LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT, or an integer pixel value.
myLayout.addView(editText);
In this case, you dont need to add the EditText's in the layout file, you are going to add it dynamically only if you need it!
Generating Edit Text Programatically in android
Hope it helps!
New to android and programming in general. This question might sound silly but I'd appreciate the answer. The question description and reasoning is at the beginning and the question is at the end of it all.
I want to apply a listener to a button in android. The way I understood from android.googlesource.com is that there is two way to do it:
applying an OnClickListener to the button in the activity.java
or
assign a method to my button in the xml layout using this
{#link android.R.attr#onClick android:onClick}
they gave the following xml layout example:
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="selfDestruct"
android:text="#string/self_destruct" />
plus the the code in activity.java
public void selfDestruct(View view) {
// Kabloey
}
android.googlesource.com
Questions:
According to this: {#link android.R.attr#onClick android:onClick} android.R.attr in the example are the following:
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="#string/self_destruct"
?
Does this:
android:text="#string/self_destruct"
android:onClick="selfDestruct"
mean that the button called self_destruct registered as a listener?
If I want to add more than one button listener in xml form how do I write it in the java document?
Thank you in advance
Really appreciate it.
Does this:
android:text="#string/self_destruct" android:onClick="selfDestruct"
mean that the button called self_destruct registered as a listener?
The button isn't "called" anything, it just has the text of the value for #string/self_destruct defined in the strings.xml file.
But, yes, the public void selfDestruct(View view) method is the method that will be called for the listener that is setup by the XML.
If I want to add more than one button listener in xml form how do I write it in the java document?
You can only set one click listener for a View.
Yes, layout_height, layout_width and text are attributes. You
can learn more about android attributes
here.
But keep in mind, that different views can use the same attributes
in different way.
It does not. The android:text attribute in this sample just refer to a string-resource called self_destruct to decide which text should be shown within the button. To distinguish views you can use android:id.
As already mentioned by other people, you are able to specify only one onClickListener using XML.
I have the following code:
<TextView
android:text="Color Yellow"
android:textColor="#000000"
android:gravity="center_horizontal"
android:background="#aaaa00"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_weight="1"
android:clickable="True"
/>
The android:clickable="True" was added because I thought it needed to be there (please do correct me if I'm wrong). However, the answer I'm seeking right now is how do I go by making another box (filled with text) pop-up upon clicking the "yellow box".
I would be grateful if someone could provide me with ideas and/or hints regarding how to actually create this scenario.
The android:clickable element does what you think and what it name tells you. It allows you to receive click events for that view (TextView here) to act on these.
To create a popup, you have to assign something to that TextView that tells you when it actually gets clicked. That is a OnClickListener. You can do that either in code or partially in code and XML. I'll just focus on the code example, but for the record, the XML one is also pretty easy. It involves setting the android:onClick="myOnClick" attribute to a certain function name that you like ("myOnClick" here) and creating a function like public void myOnClick(View v) in your activity.
What you have to do in code is
Referencing the TextView that you have in your layout
Assign the OnClickListener
Write an action that will be executed once the click gets registered
First point: To reference your TextView you have to use findViewById
TextView myTextView = (TextView) findViewById(R.id.mytextviewid);
Note that you have to assign a ID to your TextView to identify it. You can set that id via the android:id attribute in your XML layout (e.g. android:id="#+id/mytextviewid").
Second point: Once you have the reference, use TextView.setOnClickListener() to register one.
This usually looks like this:
myTextView.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// Add an action here
}
});
Third point: All you have to do now is displaying your dialog/message insite the onClick() function. There is more than one way to display that, you may use a Toast or an AlertDialog. Check out the links, there are some examples for that.
I've got a TextView that I would like to allow the user to select a range of text from within it. The TextView takes up the entire width and height of the device (minus some padding and a title at the top). In an EditText if you long-click you get a selection overlay that allows you to set your selection left and right bounds. I'd like this functionality in a TextView. I've read that in API level 9 (2.3) (http://developer.android.com/sdk/android-2.3.html) there are new text selection controls, but I'm having difficulty implementing this. I'm doing this right now:
eic = new InputConnection( bookTextView );
eic.beginBatchEdit();
But it doesn't do anything noticable. Does anyone know how to use InputConnection correctly? Thanks.
Edit: I don't necessarily need to use what I was attempting above. I ultimately want to use either a TextView or an EditText which looks and feels like a TextView and be able to select text using a dragging cursor. Then I would like to manipulate the selected text with various context menu options (or a menu that pops up above the selected text).
Here is an idea.. Add an EditText with a TextView background, Here is an example
<EditText
android:text=" This is not an editable EditText"
android:id="#+id/EditText01"
android:layout_width="wrap_content"
android:textColor = "#android:color/white"
android:editable = "false"
android:cursorVisible="false"
android:layout_height="wrap_content"
android:background = "#android:drawable/dark_header">
</EditText>
add this to your xml in the place of TextView
You can enable the TextView's Spannable storage. See Highlight Text in TextView or WebView for an example.
See also:
http://developer.android.com/reference/android/text/Spanned.html
You could display the text in a WebView and enable text selection. If you want to only use a textview/edittext, here is an answer that might help you and here is information on the Spannable class that might help you accomplish what you want.
Actually, you do not have to develop this feature by yourself. You just need to use EditText instead TextView, while you set the android:editable of EditText to false. My idea is the same as sandy's.
My code is here, hope it may help you:
https://stackoverflow.com/a/11026292/966405
After long internet surfing to find a solution, i prefered create my own class
https://github.com/orionsource/SelectableTextViewer
Goal features:
Easy to use - only one class
Support for text and Html.fromHtml
Can be in ScrollView with correct touches
Cursors can be redefined
Color of selection can be redefined
All the above solutions either too long or not working for me.
What you need is to add just textView.setTextIsSelectable(true)
in your activity or fragment or adapter.
I have an edit text and I'd like to put the following constrains (in the XML code if possible):
Disable all the capital Letters (the inverse of android:capitalize or the same fonction than toLowerCase())
Block to EditText to 1 line max. (for instance avoid that when I press enter the editText
get bigger to create a new line)
In fact , my editText is a Search Field (but in my case I don't want to use the special Search Widget).
Thanks
To make the edittext single line add this to its tag:
android:singleLine="true"
Also android:capitalize is depreciated and the following should be used instead
android:inputType="textCapCharacters"
However there seems to be no matching lowercase inputType, so you may have to implement it manually using a setOnKeyListener.
use android:lines="1" in the android xml page and then see the layout.