I have made an component for Android, which uses two drawables. Using static values for the drawables in the code, the component works but now I want to declare the values in the properties (XML) does anyone know how to do this? Is there a way to do this without using the attrs.xml?
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We have in our project a keyboard with "Key" elements, this Key elements have attributes such as android:codes="119", android:keyLabel="w" and so on.My question is how can I include an custom attribute like a "android:alternativeKeyLabel" to do something else.
View 2 Replies View RelatedI have created a simple class named Panel which extends the SurfaceView class and does some drawing in the onDraw method. When I use it from the code it works fine. For example this works as expected:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new Panel(this)); ....
However when I try adding this component from an xml layout the program crashes:
XML file (main.xml):
<?xml version="1.0" encoding="utf-8"?> <org.anddev.Panel android:id="@+id/panel" android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android"/>
Code:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);....
Error msg: Sorry!
The application Test (process org.anddev) has stopped unexpectedly. Pleas try again.
I can not figure out why the same class works when created in one way and doesn't work when created in another.
I would like to create a widget that can reads its attributes from an XML file onCreate. I've created a Custom Button that extends Button widget. I would like to define its layout and styling in an XML, such that the widget can be reused across different views, with the same styling attributes. The notepad sample code does carry some pointers to this problem, however, it defines a XML layout with the component as View, inside LinearLayout, which is not really what I'm trying to achieve here.
View 4 Replies View RelatedI'm trying to create a component using an xml layout file. I defined a layout with some custom attributes. This layout is inflated when user add it inside another layout. My problem is I don't know the parent, so I pass null for the parent viewgroup when I call inflate method. I think that's the reason why I see anything in my view. Do you know how can I do (I don't want to redefine onDraw method because I use existing component). Below my xml layout and my custom class.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content">
<ImageView android:id="@+id/img_btn_option" android:layout_width="wrap_content" android:layout_height="wrap_content"/>
<TextView android:id="@+id/txt_btn_option" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_toRightOf="@id/img_btn_option"
android:textColor="@color/font_white" android:textStyle="bold"/>
</RelativeLayout> public class ButtonOptionsView extends View {
public ButtonOptionsView(Context context, AttributeSet attrs) {
super(context, attrs);
LayoutInflater li =(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
RelativeLayout vg =(RelativeLayout)li.inflate(R.layout.button_option, null);
TypedArray ta = getContext().obtainStyledAttributes(attrs,R.styleable.ButtonOption);
((ImageView)vg.findViewById(R.id.img_btn_option)).setImageResource(ta.getResourceId(R.styleable.ButtonOption_image,0));
((TextView)vg.findViewById(R.id.txt_btn_option)).setText(ta.getResourceId(R.styleable.ButtonOption_text,0));}
I've made a little test component that overrides ImageView, called myImageView, and prints some text and an arrayList of Doubles over whatever image is specified in the related xml. However, right now, the text and Doubles that are drawn over the image are defined within the myImageView class. Is there a way to pass the data from the main onCreate function to the myImageView class before the layout is drawn?
I'm new to OO programming, but based on my understanding of this:
http://developer.android.com/guide/topics/ui/custom-components.html
It's possible because ImageView is just like any other class. This leaves me with two initial guesses:
1. I could generate my test data in the main onCreate, and store it in the array's xml file, and then read that xml file with myImageView,
OR
2. I could extend view instead of ImageView, but because of my new- ness, then I would lose the ability to use it in an xml layout sense - and that's what I really want.
I've prepared custom component based on LinearLayout. Whole component is defined in XML. Currently to use it you have to write:
<com.xxx.android.components.TopMenu
android:layout_width="fill_parent"
android:layout_height="44dp" />
Is it possible to set width and height in the java constructor? So it would be possible to write just:
<com.xxx.android.components.TopMenu />
I've tried to modify and set LayoutParams, but it didn't work for me.
I've created custom compound component and observe very strange exception (google says nothing about it). Custom component rare exception: Parser is not a BridgeXmlBlockParser!
It is very simple:
public class MyTabber extends LinearLayout {
.. public MyTabber(Context context) { super(context);
Init(context); }
I have made a Custom Component in XML, consisting of a button with an imageview stacked on top of it:
<myapp.widget.ClearableCaptionedButton
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:id="@+id/ccbutton_button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical|left"
android:textAppearance="?android:attr/textAppearanceMedium"
android:background="@android:drawable/edit_text"/>
<ImageView
android:id="@+id/ccbutton_clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dip"
android:layout_alignRight="@id/ccbutton_button"
android:layout_alignTop="@id/ccbutton_button"
android:layout_alignBottom="@id/ccbutton_button"/>
</myapp.widget.ClearableCaptionedButton>
Extract of java source code:
public class ClearableCaptionedButton extends RelativeLayout implements OnClickListener {
...
public ClearableCaptionedButton(Context context, AttributeSet attrs) { super(context, attrs);
// some stuff that works fine
} ..
protected void onFinishInflate() { super.onFinishInflate();
mButton = (Button) findViewById(R.id.ccbutton_button);
mClear = (ImageView) findViewById(R.id.ccbutton_clear);
mButton.setText(""); // error here: mButton == null
}
My problem is similar to this one. When I try to find the views inside the custom compound, findViewById returns null. But, as you can see, i already added super(context, attrs); to the constructor. I am using the custom component directly in xml layout, like this:
<LinearLayout>
<!-- some stuff -->
<myapp.widget.ClearableCaptionedButton
android:layout_width="fill_parent"
android:layout_height="wrap_content"
app:caption="to"/>
</LinearLayout>
I'd like to create a custom component which supports voice recognition. (Custom Component which displays voice recognition button if available). It will primarily be an extended EditText which should show the microphone button for voice recognition if it is available. I wanted to to look at the search app-widget on the homescreen but I don't find it in the source. This is intended to use the voice recognition as some sort of dictation device, i.e. the user does not have to type but use his voice instead. So could anyone please point me in some direction?
View 1 Replies View RelatedI'm developing a small application in with a list view filled with a compound component. This component has two text view and one button inside. One of the text view is invisible and when the button is clicked it should appear. I can show the list but i can't make the textview visible when the button is clicked. Here is the xml of the component: And this is the ArrayAdapter that fills the list:
public class AddressAdapter extends ArrayAdapter { int resource;
RelativeLayout placeView;
EditText addressText;
public AddressAdapter(Context _context, int _resource, List _items) {
super(_context, _resource, _items);
resource = _resource;
} private OnClickListener buttonClick = new OnClickListener() {
public void onClick (View v) {
int i = placeView.findViewById(R.id.stub_import).getVisibility();
visibility(i);
} };
private void visibility(int i) {
// TODO Auto-generated method stub switch(i) {
case(View.GONE): { addressText.setVisibility(View.VISIBLE);
} case(View.VISIBLE): { addressText.setVisibility(View.GONE);
} } }
@Override public View getView(int position, View convertView, ViewGroup parent) {
Item item = getItem(position);
String name = item.getName();
String address = item.getAddress();
if (convertView == null) {
placeView = new RelativeLayout(getContext());
String inflater = Context.LAYOUT_INFLATER_SERVICE;
LayoutInflater vi = (LayoutInflater)getContext().getSystemService(inflater);
vi.inflate(resource, placeView, true);
} else { placeView = (RelativeLayout) convertView;
} TextView nameText = (TextView)placeView.findViewById(R.id.placeNamwView);
Button button = (Button)placeView.findViewById(R.id.Button01);
addressText = (EditText)placeView.findViewById(R.id.placeAddressText);
button.setOnClickListener(buttonClick);
nameText.setText(name);
addressText.setText(address);
return placeView;
} }
The app I'm working on has 4 tabs, 3 of which share many features, including a navigation bar a the bottom with Back, Edit, and Map buttons. There is exactly the same xml in all 3 layouts, so I'm trying to DRY this out by extracting that xml into a separate component, including it, and then going from there. Previously I had:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
android:layout_width="fill_parent">
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/showedit_toolbar" style="@style/showItemToolbar">
<ImageButton android:id="@+id/show_person_back_button"
style="@style/blackToolbarButton"
android:src="@drawable/left_white_arrow"
android:layout_alignParentLeft="true"/>
<Button android:id="@+id/show_person_map_button"
style="@style/blackToolbarButton"
android:text="map" android:layout_alignParentRight="true"/>
<Button android:id="@+id/show_person_edit_button"
style="@style/blackToolbarButton"
android:text="edit" android:layout_toLeftOf="@id/show_person_map_button"/>
</RelativeLayout>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:layout_above="@id/showedit_toolbar"
style="@style/CoinLightTheme">
// Lots more layout omitted
I extracted out the bit that's repeated into an xml file called show_toolbar.xml, changing the names of variables to make it more generic across the 3 views
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/show_toolbar" style="@style/showItemToolbar">
<ImageButton style="@style/blackToolbarButton"
android:src="@drawable/left_white_arrow"
android:layout_alignParentLeft="true"
android:id="@+id/show_back_button"/>
<Button android:id="@+id/show_map_button"
style="@style/blackToolbarButton"
android:text="map" android:layout_alignParentRight="true"/>
<Button android:id="@+id/show_edit_button" style="@style/blackToolbarButton"
android:text="edit" android:layout_toLeftOf="@id/show_map_button"/>
</RelativeLayout>
Then from within my original layout file, I replaced that big block of code with
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent" android:layout_width="fill_parent">
<include android:id="@+id/show_toolbar" layout="@layout/show_toolbar"/>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent" android:layout_width="fill_parent"
android:layout_above="@id/showedit_toolbar" style="@style/CoinLightTheme">
Now, the problem is that the view no longer shows up. Including Custom component causes it to be hidden behind main viewI can still click the buttons and they respond (i.e. if I click in the corner where the button should be, it still works), but I cannot see the buttons or bar onto which they were drawn. I cannot find very good documentation on how Include is supposed to work, so perhaps I am using it incorrectly.
I have a res/layout/main.xml including these elements and others:
<some.package.MyCustomView android:id="@+id/foo" (some other params) />
<TextView android:id="@+id/boring" (some other params) />
In my Activity's onCreate, I do this:
setContentView(R.layout.main);
(TextView) boring = findViewById(R.id.boring);
// ...find other elements...
MyCustomView foo = (MyCustomView) findViewById(R.id.foo);
if (foo == null) { Log.d(TAG, "epic fail"); }
The other elements are found successfully, but foo comes back null. MyCustomView has a constructor MyCustomView(Context c, AttributeSet a) and a Log.d(...) at the end of that constructor appears successfully in logcat just before the "epic fail".
findViewById() returns null for custom component in layout XML, not for other components. Why is foo null?
The Android app I'm currently developing has a main activity that has grown quite large. This is mainly because it contains a TabWidget with 3 tabs. Each tab has quite a few components. The activity has to control of all those components at once. So I think you can imagine that this Activity has like 20 fields (a field for almost every component). Also it contains a lot of logic (click listeners, logic to fill lists, etc). What I normally do in component based frameworks is to split everything up into custom components. Each custom component would then have a clear responsibility. It would contain it's own set of components and all other logic related to that component.
I tried to figure out how this can be done, and I found something in the Android documentation what they like to call a "Compound Control".
(See http://developer.android.com/guide/topics/ui/custom-components.html and scroll to the "Compound Controls" section) I would like to create such a component based on an XML file defining the view structure.
In the documentation it says:
Note that just like with an Activity, you can use either the declarative (XML-based) approach to creating the contained components, or you can nest them programmatically from your code. Well, that's good news! The XML-based approach is exactly what I want! But it doesn't say how to do it, except that it is "like with an Activity". But what I do in an Activity is call setContentView(...) to inflate the views from XML. That method is not available if you for example subclass LinearLayout. So I tried to inflate the XML manually like this:
public class MyCompoundComponent extends LinearLayout {
public MyCompoundComponent(Context context, AttributeSet attributeSet) {
super(context, attributeSet);
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
inflater.inflate(R.layout.my_layout, this);
} }
This works, except for the fact that the XML I'm loading has LinearLayout declared as the root element. This results in the inflated LinearLayout being a child of MyCompoundComponent which itself already is a LinearLayout!! So now we have a redundant LinearLayout in between MyCompoundComponent and the views it actually needs. Can somebody please provide me with a better way to approach this, avoiding having a redundant LinearLayout instantiated?
I am writing a custom component (derived from a relative layout) which has to show a dialog. Is there a way to do this using callbacks like oncreatedialog or onpreparedialog? if not: if i have to create the dialog outside oncreatedialog, i have to "attach it to an Activity with setOwnerActivity(Activity)". How can the custom component access the activity it is used in, when it is used in the activity's xml-layout and not created from code?
View 1 Replies View RelatedI'm reading the android developer docs on creating custom components and one thing that's unclear, is whether you can define the layout of your component using xml and then reuse that across class libraries. like, say for instance, I want to create a class library called myComponents, and in there i want to have myTehAwesumsWidget or whatever, and i want the layout to be defined in xml, can i include that xml in the referenced class library?
View 1 Replies View RelatedI'm building using Ant and trying to use build.properties to override some default values, and failing miserably. What am I missing?
Here's what I've tried:
1) Create a project with: > android create project --target 1 --name MyAndroidApp --path ./MyAndroidAppProject --activity MyAndroidAppActivity --package com.example.myandroid
How to get the dirty(changed) properties(any controls subclasses of view) amongst a number of properties on a layout. Does android has a dirty flag to mark if the layout has any field that has a changed content?
View 2 Replies View RelatedHow can I make my own UI defining my properties?
View 2 Replies View RelatedI'm creating an currency exchange rate application to learn Android. The app will list all exchange rate in a list, each of them has the layout like this (in essential) code...
To list exchange rate for all currencies I have the following approach:
- Design the layout for one currency (let's choose EUR as first currency)
- Generate the layout for all other currencies automatically by:
1. Copy all properties of the EUR-layout into the new currency layout
2. Modify some properties of new currency layout like: ID, Rates ...
3. Repeat steps 1,2 for all sub-layout of the new currency layout
But I don't know how to code step 1, so I did a lot of google about: "android copy view" "android copy properties" "android copy view" "android clone view" "java clone object" .... but still no solution.
So, my question is: how to copy all properties of a view ?
When I import a new existing project into Eclipse, I get the following error message when attempting to execute as an Android project..
View 1 Replies View RelatedI am modifying the Settings application, and needing to access the system properties. By using android.os.SystemProperties.get, I can read the system properties. However, I can not set the system properties back with android.os.SystemProperties.set. This function has no return and the system properties never get changed. Why? Is there any permission required?
View 6 Replies View RelatedI'm using BaseExpandableListAdapter, and there is a drop-down button (looks like an arrow) on the left side for each parent item to indicate that you can expand that item to view child items. The question is: How can I change the properties of that drop-down button such as its position? I basically want to move it a bit lower in each parent item.
View 2 Replies View RelatedI have an activity with a ListView which is populated through a custom ArrayAdapter. There is an array of objects which have a Boolean property called 'isRead'. Based on the value of this property, I want to set the typeface of one of the TextViews in the row to either 'normal' or 'bold'. I also set the color of the text to either 'gray' or 'black When the Activity initially starts up, everything works as expected. If isRead is true, the text is gray with a normal font. Once I scroll down the list and then scroll up again, the text of an object where isRead is true is colored gray, but the font is bold. Code...
View 1 Replies View RelatedI am wondering if anyone else is encountering this issue (or if its just me). I converted an app I have been working on from using a regular view to using SurfaceView. The app accesses listviews to change properties of the elements I am drawing on a canvas. The listviews called from the SurfaceView version draw over themselves mis-registered when I scroll long lists quickly. If anyone out there has had a similar problem and/or has an idea what might be going on and/or has a suggestion as to how to fix this.
View 2 Replies View RelatedHow can I find hardware properties at runtime? I want to be able to know if the device has a physical keyboard, d-pad, trackball, etc.
View 1 Replies View RelatedI would like to retrieve the properties that describe an mp3 file's properties (ie: author, album, title).I was not able to use javax.sound.sampled.AudioFileFormat to do this.
View 2 Replies View RelatedI want to center the application title/label in my android app but I can't find a lot of documentation on how to set that property. I have found a couple of posts saying that I can create a custom title bar and change the theme in my manifest but I just can help think there is a simpler way to just center the title.
Where is the right place to specify general user-defined properties, like a host address or a service mail address ? The properties should be accessible from my activities.
I would like to specify such attributes within the AndroidManifest.xml, but there seems to be no elements available for user-defined properties. So the only way may be to put such properties into a resource file as strings or to hide them into the source code...
I'm looking for a way to dynamically change an elements properties.
For example I want the user of my app to be able to enter a value within my program that will change android:layout_marginTop="blabla" to whatever I want. It doesn't specifically have to be that property, I want to be able to change any property of any element. Is there a way to do this?