Android : Put Custom View Above Built In Views In Droid?
Mar 11, 2010
I am developing a small app for Android. I am creating my own view.
I am planning to design the layout to be:
<LinearLayout>
<MyView>
<Button><Button>
</LinearLayout>
But when I run my program, my custom view will cover the whole screen. Is there anyway to avoid this?
I have already tried to add android:layout_width, layout_height to be wrap_content, fill_partent, but no luck.
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May 14, 2009
Is it possible to clone a view. If no, how to support clone of a view in custom views. If yes.. which api should we use. clone method seems to be protected for view.
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Jan 6, 2010
I have a simple ListView and on that ListView I have placed a number of custom defined Views. The CustomView has ImageView and two TextViews.
The CustomView also has a "stateful drawable" as background, so that the background image (a 9-patch) changes if you press the Row in the ListView. When pressing the Row, the background image changes to a Red-ish thing.
The problem is that when the background changes from the default greyish, all the Views in the CustomView (ImageView and TextViews) still have their greyish background and thus creates very ugly greay boxes on top of the now redish background.
What is the best way to solve that problem? I hoped that such things were handled automatically (as it is done in for example .NET), but I was wrong it seems.
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May 25, 2009
I have a remove assistant app, which allows customers to perform a subset of functions of a desktop application, untethered. Results are communicated back & forth via messages left at a license server. In order to have a single source for the logic of the assistant, yet run on multiple platforms (Swing, MIDP, & Android), I write a driver composed of Database, Network, & Display pieces.
The Android driver is nearly complete, but I run into a brick wall when it comes to Tabs. All views are instanced calling code, not XML defined. I already have the view before I try to add it.
I tried sub- classing TabHost:
CODE:.................
As is shown in the code, it errors in setup. Looking further down in setup() I will also get this exception too: Your TabHost must have a FrameLayout whose id attribute is 'android.R.id.tabcontent
Is there a way to trick setup() into instancing me mTabWidget & mTabContent members?
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Jan 1, 2010
How can I do it?
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Aug 16, 2010
im having a problem getting a custom view that i created on the xml layout file. i have a class named DrawingLayout which extends FrameLayout. it is found in the package Drawing
as stated on this page http://developer.android.com/guide/topics/ui/custom-components.html i used the following decleration in xml
<Drawing.DrawingLayout ... />
but whenever i run the program with that decleration i get a runtime exception error on SetContentView( ... )
is there something im not doing well? If you need any more details please tell me because i cant seem to figure this one out.
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Nov 10, 2010
Is it possible to nest one custom views within another Custom view?
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Feb 9, 2010
I'm still trying to figure out how best to layer views on top of other views. I want to do something like the ZoomButtons on top of a custom view. I tried getting the ZoomButtonsController's parent and then adding views, but I didn't have enough control and they ended up on top of the buttons. I've gotten close by using a FrameLayout and some gravity on the top two views. But this has some interesting effects. Since this is contained with a tab, these two top views appear on top of all four of the tab pages. I want them on top of one of those pages only. Apparently, nested FrameLayouts don't mix well. What is the proper and expected way to do this? Here is more or less my complete layout....................
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Oct 9, 2010
Is there a possibility to add a view or derivative (button, textview, imageview etc...) to another view without having to go through layouts?
I have a class called ScreenView, it derives from View (e.g. public class ScreenView extends View).
I wanted to display text into it, labels, images etc..
On an iPhone it's trivial, simply create my objects and use addSubview method ; you can embed any UI objects into another. Most UI toolkits work that way too.
Problem with layouts is that I haven't found an easy way to properly position a subview (say a text view) in a given location of the enclosing View. I want one to contain the other...
I was hoping I had missed something in the documentation (which is far from being intuitive that's for sure) and I could do something like myView.addView(subview). But it ain't so :)
As a side question, what is the closest to iPhone's UILabel in the Android world?
A UILabel can contain a text or a graphic. Right now I've been using TextView and ImageView but they aren't anywhere as flexible when it comes to layout as a UILabel
Edit: Making my View inherit from ViewGoup instead, let me add subview..
However, I want to draw in my view. I found that when ScreenView extends ViewGroup, the onDraw function is never called then.
Something like:
CODE:..........
Would paint in yellow my view if ScreenView extends View ; but not if it extends ViewGroup.
How do you draw directly in the view then?
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Apr 26, 2012
I'm trying to make a custom kernel for the Samsung Gravity SMART using sources from the unofficial CM9 port for the Gio/Ace (which both use very similar hardware to the Gravity Smart). What I've succeeded at so far:
1) Acquiring the source, both for the CM9 kernel and for the stock Froyo kernel
2) Searching for the device-dependent references in the stock kernel
3) Porting those changes over to the CM9 kernel
4) Getting everything to actually compile
5) Acquiring the stock CM7.2 source
6) Creating device makefiles (i.e. BoardConfig.mk, etc)
7) Building CM7.2 using kernel built in step #4
8) Putting the various img files into an Odin-compatible .tar.md5
9) Actually flashing to the phone.
And for all that work, I got.. a soft-bricked phone (fortunately, I have an Odin file for stock firmware). The phone boots to a SAMSUNG logo (not flashing/throbbing). how the heck do I figure out what's actually failing? Is there a bootloader to unlock, and if so how do I unlock it?
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Aug 13, 2009
*I have used three custom views... playpanel works fine.. but drawHeaderpanel does not workk..*
public class MainPanel extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);...................
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Aug 30, 2009
Does anybody knows if (and how ) I can write a custom view/widget and then use it in resources in layout defintions?
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Oct 2, 2010
I am parsing the url to display the contents in it, my requirement i have to display the each content in separate textviews.
For Instance: Let us assume the contents in that url are FootBall, Carom , chess, VolleyBall and so on . I want to display FootBall as a individual textview similarly others. so i cannot declare the textviews in xml what i usually do.
CODE:................
So i planned to create textview via java code
This is my parsing code which parse the url contents and store the result in a string array namely san_tagname; depending upon the length of this variable i want to create number of textviews.
CODE:..................
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Mar 25, 2010
The reason for me to do this, I have created these 2 views in the beginning of the app. SO they are always present. But in some cases where i want only 1 view(which is surfaceview) and if i dont need the 2nd view(i.e, videoview), i am still getting a black patch at the palce where i have defned a videoview. want to get rid of this. Can anyone please tell me if it is possible to disable views/surfaces corresponding to them? If so how can we do this?
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Oct 23, 2010
I am trying to figure out how to add a child view to a parent view so I can use the MotionEvent.ACTION_MOVE feature to move from one child view to the next. Is this possible?
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Jun 12, 2010
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>
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Jun 12, 2009
I created a custom SurfaceView called CaptureView and tried to add it into main.xml file.The application seems to work fine but if I switch from main.xml tab to Layout in Eclipse the text NullPointerException appears instead of layout preview.Does anyone know how this issue could be solved?
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May 31, 2010
I have a set of custom views that I would like to add to a LinearLayout object. However, the first object I add to the layout (I do this dynamically, during runtime) has a OnMeasure method that tries to get as much space as possible resulting in that it get's all the space LinearLayout object. This is correct behavior, but when I then add more objects following that I want the allocated area for the first object to decrease so the others will fit. As it is now, each following object will get zero space, and hence won't be visible.
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Dec 22, 2009
I have a requirement to create a control similar to UITabBar in iPhone, which is to be present on every activity of my application. UITabBar essentially is a battery of buttons exhibiting a TAB like behavior: every button maps to an activity. I have two solutions for this: 1. In the layout XML for every activity, I insert a <LinearLayout><Button/><Button/><Button/></LinearLayout> element. And then have a common listener class that will handle the button clicks. So, every activity will have an instance of this listener. 2. To create a custom Widget extending LinearLayout class, put all the buttons as its static members and let it handle the button clicks. Include this custom control in every screen.
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Apr 26, 2010
While researching how to create custom compound views in Android, I have come across this pattern a lot (example comes from the Jteam blog)I mostly understand how this is working, except for the part where inflate() is called. The documentation says that this method returns a View object, but in this example the author does not store the result anywhere. After inflation, how is the new View created fromt eh XML associated with this class? I thought about assigning it to "this", but that seems very wrong.
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Nov 11, 2010
I have an List Activity with a Base Adapter where the contents have changed (example - the rows are reordered). I have tried invalidate.
Code...
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Apr 19, 2009
Is it possible to add a view dynamically that overlaps other views in the layout. I have Linear Layout defined for the activity. As part of the Layout I have a custom View. The content changes dynamically and sizes appropriately based on the content size, with fill_parent for width and wrap_content for height. But what I want is, dynamically take over the full screen and then based on a click go back to the normal mode. Is there a mode to display a view where - in it can overlap all other views in the layout?
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Feb 12, 2009
I'm looking for a way to iterate a viewgroup to retrieve all child views without calling findViewById(). Does view count and view position line up? So can I get the view count and then use that as a counter to call getChildAt(int index)?
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Aug 17, 2010
I want to build my own custom view which should look like the Crysis-GUI.At first I designed a XML-based Layout and made it visible via the setContentView(int resid)-Method. Worked pretty well.But now I wan't to go a step further and draw in my Layout. So I created a new Class, let it extend View and overrode the onDraw()-Method. So far so good.But how can I still use my XML-Layout? I can't do setContentView anymore, so how could the same effect be achieved?
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Aug 30, 2010
I am generating a custom View that contains a number of drawables that are added to the View dynamically. This means the View's size could be anything, and is likely to stretch off the screen. Where it does stretch off the screen I want scrolling to be enabled.
So far I have tried:
adding the custom view directly to my Activity - this displays the drawables ok, but with no scrolling
adding the custom view as a child to a ScrollView and setting the ScrollView as the content in the Activity - this doesn't display anything.
How do I generate a custom view of arbitrary size, display it and have scrolling where it is too big for the screen?
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Oct 18, 2010
I was wondering if there is a way for placing a view to the right side of another view and centering it vertically on the second views height. In know this can be done using a LinearLayout, but for other reasons the 2 views must be part of the same RelativeLayout.
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Jan 20, 2010
I have an activity defined as:
CODE:...................
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Aug 22, 2010
I've successfully implemented onRetainNonConfigurationInstance() for my main activity to save and restore certain critical components across screen orientation changes.
But it seems, my custom views are being re-created from scratch when the orientation changes. This makes sense, although in my case it's inconvenient because the custom view in question is an X/Y plot and the plotted points are stored in the custom view.
Is there a crafty way to implement something similar to onRetainNonConfigurationInstance() for a custom view, or do I need to just implement methods in the custom view which allow me to get and set its "state"?
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Sep 15, 2010
can any body give example of multicolumn custom list view in android..
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May 26, 2010
I have a custom view that works fine and I'm trying to get gestures into it. The most common technique I see is to add XML, such as this (from Android docs.Can someone point out my errors, suggest a better way that will allow me to get gesture callbacks and/or suggest diagnostic approaches?
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