Is there a way I can store/retrieve arbitrary values from a view, similar to HTML5 data attributes?
This way, I can have a view call generic onClick() methods and the method can retrieve the related data.
e.g:
<ImageView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="setCountry"
android:src="#drawable/ic_flag_germany" />
<ImageView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="setCountry"
android:src="#drawable/ic_flag_france" />
...
I would like to be able to retrieve a value from the one that got clicked.
public void setCountry(View v){
//retrieve data somehow
}
You can use the View's tag property. It is intented for that purpose.
For example:
<ImageView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="setCountry"
android:src="#drawable/ic_flag_germany"
android:tag="Germany" />
...
public void setCountry(View v) {
System.out.println(v.getTag());
}
Derive from ImageView, add a member variable "country" and accessor methods. Then you can reference your class in the layout file:
<com.foo.MyImageView ... />
Or use the tag property. It lets you attach an arbitrary object to a control, but there's no type safety, and no accessor methods with appropriate names. You can specify a string tag right there in the XML file.
Or use some kind of mapping from control ID to country.
Related
In my XML layout I have some TextView with ids like slot0, slot1...slot15.
Is there any way to generate the corresponding Id dynamically in java like the following?
findViewById(R.id.*customStringForId*)
then access each of TextView using a for loop?
I am currently unable to use findViewById(R.id.*customStringForId*) because I can't find it in the XML.
Thats a bad practice for access component from your xml
You need set manual for id with findViewById for tell java class if in your xml there existing textview with id which already you set and give you access for do whatever like implement onclick event, settext, etc.
If you cant find your id, you need check if setContentView in your java point to your xml.
there are some ways to solve your problem but you should write your layout in the question to let us know how you design the layout.
But for example if you have a list of TextViews inside layout like the following:
<LinearLayout
android:id="#+id/layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/slot0"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="example" />
<TextView
android:id="#+id/slot1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="example" />
<TextView
android:id="#+id/slot2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="example" />
</LinearLayout>
you can access the TextView Dynamically via the layout like the following:
public TextView getTextView(int index){
return ((LinearLayout) findViewById(R.id.layout)).getChildAt(index)
}
I have a button with centralized icon+text, and I need to change the app:icon and android:text properties when some event occurred. I know that there is setText() method to change the text, but is there a way to change the icon?
XML:
<Button
android:id="#+id/bottom_button"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginHorizontal="#dimen/default_margin"
android:layout_marginVertical="#dimen/bottom_bar_content_vertical_margin"
android:backgroundTint="#color/light_green"
android:text="#string/next"
android:textAllCaps="false"
app:icon="#drawable/ic_baseline_next_plan_24"
app:iconGravity="textStart" />
This is a function that is called after appropriate event, and I need to change icon in that function. icon and text are ids of desirable drawable and string:
private void setBottomButton(int icon, int text) {
button.setText(getString(text));
}
You can use the methods:
setIcon
setIconResource
Example:
button.setIcon(drawable)
button.setIconResource(iconId)
Here the doc.
If you check the docs, you'll see the code equivalent for each XML attribute.
Check this link : enter link description here
Searching for drawableLeft shows:
android:drawableLeft:
setCompoundDrawablesWithIntrinsicBounds(Drawable,Drawable,Drawable,Drawable)
I want to use a way of bindings like this:
<ImageView
android:id="#+id/play"
android:layout_width="30dp"
android:layout_height="30dp"
android:background="#{play.isEnabled() ? #drawable/round_button : #drawable/round_disable_button}"
android:src="#drawable/play" />
I want that binding get updated when I disable or enable that ImageView in Java class, how can I do this?
You can't
Practically, you can create a custom view, extended from ImageView, and do this pragmatically.
Edit: you can use MVVM third party library for android like this: https://github.com/manas-chaudhari/android-mvvm
I have 2 layouts which contain the same buttons
layout_1.xml
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:id="#+id/button_1"
android:text="button2"
android:background="#android:color/black"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
and
layout_2.xml
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:id="#+id/button_1"
android:text="button2"
android:background="#android:color/white"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
Please assume these are all valid layouts etc.(I am just adding the relevant code.).
So in my fragment ,I inflate and use layout_1.xml in onCreateView.I want to toggle between the 2 scenes using button_1.
I can set the listener for button_1 in layout_1.xml during the onCreateView().
The problem is trying to set a listener on that button in the second view.i.e. the listener does not activate for the second scene(with layout_2.xml).And hence i canot toggle between the 2 scenes.Is there a way to achieve this?
It would actually appear that a proper way to do this would be to on the second scene you define an action to be performed as such:
mSecondScene.setEnterAction(new Runnable() {
#Override
public void run() {
((Button) mSecondScene.getSceneRoot().findViewById(R.id. button_1)).setOnClickListener( ... );
}
This will allow you to set your ClickListener on the View without the data binding to a generic click listener method. Then you can perform the Transition to the second scene and viola.
In general, it is not a good idea to have multiple views with the same id. This is what caused the confusion here.
Note: Below is the solution used by OP that was suitable for their specific needs:
One simple solution is to use the onClick attribute in the XML file. You can assign the same onClick method to multiple items. Like this:
And in your activity.java add this:
public void buttonClicked(View v){
Log.d("TAG","Button clicked!!"
// do stuff here
}
2nd option:
When you set a listener for one button with the id of button_1, it does not set the listener for both buttons, it only sets it for the first one. If you want to set the same listener for both, all you need to do is to assign these button different ids and then assign them the same listener.
This is what you should do:
Listener myListener = new Listener(){.. blah blah....};
((Button) findViewById(R.id.some_id)).setListerner(myListener);
((Button) findViewById(R.id.some_other_id)).setListerner(myListener);
3rd option:
findViewById(R.id.id_of_layout1).findViewById(R.id.button_1)
findViewById(R.id.id_of_layout2).findViewById(R.id.button_1)
in this case, you need add some id to your layout files, for example: layout_1.xml:
<RelativeLayout
android:id="+id/id_of_layout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:id="#+id/button_1"
android:text="button2"
android:background="#android:color/black"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
I'm trying to program a disc golf scoring app on Eclipse for my android phone. I'd like to set it up for up to 6 players, but mostly 2 people will use it for a game. The data is being stored in a sqlite DB, and I am using a SimpleCursorAdapter to populate the data for holes that have already been scored. here is that code:
private void fillData() {
Cursor notesCursor = mDbHelper.fetchAllNotes();
startManagingCursor(notesCursor);
// Create an array to specify the fields we want to display in the list (only TITLE)
String[] from = new String[]{DiscGolfDbAdapter.KEY_HOLE,
DiscGolfDbAdapter.KEY_PAR,
DiscGolfDbAdapter.KEY_TOM_HOLE,
DiscGolfDbAdapter.KEY_TOM_GAME,
DiscGolfDbAdapter.KEY_CRAIG_HOLE,
DiscGolfDbAdapter.KEY_CRAIG_GAME,
DiscGolfDbAdapter.KEY_TOMS_POSITION,
DiscGolfDbAdapter.KEY_SKIP_PLAYER
};
// and an array of the fields we want to bind those fields to (in this case just text1)
int[] to = new int[]{R.id.schole, R.id.scpar, R.id.scth, R.id.sctg, R.id.scch, R.id.sccg, R.id.sctp,
R.id.skip};
// Now create a simple cursor adapter and set it to display
SimpleCursorAdapter notes =
new SimpleCursorAdapter(this, R.layout.hole_info, notesCursor, from, to);
setListAdapter(notes);
}
From searching the internet I've found what I think are two posibilities that SHOULD work, but do not.
First I've tried the XML Attribute: android.visibility. It looks like this in the PORTION of the view that I am trying to "test" hide:
<LinearLayout android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android.visibility="GONE">
<TextView android:id="#+id/scch"
android:layout_width="45dip"
android:gravity="right"
android:textSize="25sp"
android:layout_height="wrap_content"/>
<TextView android:id="#+id/sccg"
android:layout_width="45dip"
android:gravity="right"
android:textSize="25sp"
android:layout_height="wrap_content"/>
</LinearLayout>
I have tried it with "GONE", "Gone" and "gone". NONE of them work in the eclipse emulator OR on my actual phone. So, there is no point in trying to parameterize this attribute.
Next I've tried setting the XML attribute for android:layout_height to "0dip". This indeed works in the emulator and on my phone WHEN IT IS HARDCODED.
Then I moved to the next logical step (as I see it), storing a parameter in the DB so that I can "show" or "not show" the item DEPENDING on conditions within the record. So, I've stored a field in the DB with two values "0dip" and "wrap_content". I pass these to the layout as shown in the java above as R.id.skip. I've also added these to the output just to audit that they are really there. Here is that XML:
<LinearLayout android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="#+id/skip">
<TextView android:id="#+id/scch"
android:layout_width="45dip"
android:gravity="right"
android:textSize="25sp"
android:layout_height="wrap_content"/>
<TextView android:id="#+id/sccg"
android:layout_width="45dip"
android:gravity="right"
android:textSize="25sp"
android:layout_height="wrap_content"/>
</LinearLayout>
<TextView android:id="#+id/skip"
android:gravity="center"
android:layout_width="315dip"
android:textSize="10sp"
android:layout_height="wrap_content"/>
In the above test, both via the Eclipse emulator and my android phone, the last TextView confirms that the DB contains either "0dip" or "wrap_content", BUT the LinearLayout with:
android:layout_height="#+id/skip">
behaves as if it were "0dip" ALL of the TIME. In other words, I cannot PROGRAMMATICALLY" affect the XML attribute for android:layout_height.
If there is a better/more standard way of accomplishing what I am trying to do, please share - BUT BE CLEAR. I am new, so CODE EXAMPLES wwill work best for me.
May 29th - It seems to me (based on testing) that you cannot alter layout attributes for the layout specified in this code:
SimpleCursorAdapter notes = new SimpleCursorAdapter(this,
R.layout.hole_info,
notesCursor, from, to);
setListAdapter(notes);
Anything I try leads to some error ort another. So, I've seen examples of custom list adapters where these attributes are altered, so I'm trying to convert to a custom list adapter.
Why not do it in code?
LinearLayout ll = (LinearLayout)findViewById(R.id.your_layout_id);
ll.setVisibility(View.GONE);
Your XML layout code
android.visibility="GONE"
should be
android:visibility="GONE"
Change visible of a LinearLayout like Gabriel NeguĊ£ say:
LinearLayout ll =
(LinearLayout)findViewById(R.id.your_layout_id);
ll.setVisibility(View.GONE);
or change height of LinearLayout:
LinearLayout ll = (LinearLayout)findViewById(R.id.your_layout_id);
LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) ll.getLayoutParams();
lp.height = 0; // or lp.height = LinearLayout.LayoutParams.WRAP_CONTENT;
ll.setLayoutParams(lp);
What about this guy's solution http://enjoyandroid.wordpress.com/2012/03/12/customizing-simple-cursor-adapter/
Kind of worked for me.