Android : Clear Contents Of A RelativeLayout Programmatically - Droid Java
Aug 19, 2010
I am dynamically adding ImageViews to a RelativeLayout depending on user input. I have also created a button that when pressed, should clear all of the content of that RelativeLayout (remove all children). I was hoping for a .clear() method, but no such luck.
can someone point me in the right direction here?
RelativeLayout rel = (RelativeLayout) findViewById(R.id.iv_section);
rel.SomethingToRemoveAllChildren();
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Nov 9, 2010
I have ScrollView with RelativeLayout as a child of ScrollView. I am trying through JAVA code to set Layout_Gravity to CENTER so my RelativeLayout is centered (horizontally and vertically) in the middle of ScrollView (that covers whole screen).This works fine in XML and produces desired result, but when I try to do this programmatically, it seems there is no way to set Layout_Gravity of RelativeLayout. I tried using LayoutParams, but couldn't find anything there that would help me to center RelativeLayout in the middle. So, am I missing something or this simply can't be done?
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Jun 7, 2010
I am using 8 EditText boxes from the NewCard.xml from which i am taking the values and when the save button is pressed i am storing the values into a database, in the same process of saving i am trying to get the values and present them into 8 different TextView boxes on the main.xml file and when i press the button i get an FC from the emulator and the resulting error is java.lang.NullPointerException.
If Some 1 could help me that would be great, since i have never used databases and this is my first application for android and this is the only thing keepeng me to complete the whole thing and publish it on the market like a free app. Here's the full code from NewCard.java. Code...
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Apr 16, 2010
Does anyone know how to clear defaults of my own app by code.I know that a user can always go to Manage Applications, find my app and click the button there to clear previously assigned default actions. But for most users this isn't intuitive at all. I would like to offer my customers a solution to clear defaults within my own app if they don't like to use my app as a replacement for a specific action anymore.
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Nov 19, 2010
I want to programmatically clear the history of the android maps (and navigation) application.
I know there is a way to clear the browser history via Browser.clearSearches(getContentResolver());
And the corresponding permission: com.android.browser.permission.WRITE_HISTORY_BOOKMARKS
and this works fine (2.2.).
I couldn't find any way to clear the Maps-History though. Clearing the google/history online doesn't help either.
There are some apps in the market that promote to do that, so there must be an API for it, but i really couldn't find it yet.
I also messed around a bit with CLEAR_APP_CACHE and CLEAR_APP_USER_DATA but seems like they are signed/root-only permissions and delte too much anyways.
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Sep 22, 2010
During my activity I'm sending an intent to the browser in order to display a webpage :
Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse("http://ww.mywebpage.com"); startActivity(i);
I need to make sure that before sending the intent the browser cache and history are cleared so that the page get loaded from server directly and not from phone.
So far I've found the 2 following but I'm not sure they are used correctly :
Browser.clearHistory(getContentResolver());
Browser.clearSearches(getContentResolver());
Also with that cache is not cleared.
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Aug 31, 2010
I have set of images fetched from internet and set it on gridview,here i have option to click here to view more,below the grid view and it fetches images and set it on grid with prevoius set of images,when i exit the application and run it again,the previous set of images remain in cache and grid shows images from cache,here i need to clear my application cache memory,when i exited my application.how can i get it.
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Apr 13, 2010
I have a RelativeLayout defined in xml and I call the setContentView(R.layout.relativeLAyout) for displaying in Activity. Now, if I want to resize this RelativeLayout then can it be done and if yes, then can someone let me know how? The inner components can be resized relatively to the parent.
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Jan 16, 2010
I'm new to android and I'm trying to figure out how to get the contents of a URL as a String. For example if my URL is http://www.google.com/ I want to get the HTML for the page as a String. Could anyone help me with this?
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Dec 2, 2009
I feel a bit blind developing on an emulator for Android and not being able to see the file system on the AVD (.img). Is there a way to mount it in Windows or Linux, so that I could at least see the file listing and maybe contents?
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Aug 7, 2010
I'm creating an Android app, where the user starts out seeing a list of questions. When the user clicks a question, I would like to show him a new clickable list, containing that question and its answer alternatives.
My questions reside in rows in the database. The questions live in the first column, while the answer alternatives live in the following columns.
I've managed to display any single element from the row when I click a question in the list, but how to display more than one completely eludes me.
This is the relevant source code in the intent entered when the user clicks a question:
private void fillData() {
Bundle extras = getIntent().getExtras();
Long id = extras != null ? extras.getLong(QuestionsDbAdapter.KEY_ROWID) : null;
Cursor questionsCursor = mDbHelper.fetchQuestion(id);
startManagingCursor(questionsCursor);
String[] from = new String[]{mDbHelper.KEY_QUESTION,
mDbHelper.KEY_ALT1,mDbHelper.KEY_ALT2};
int[] to = new int[]{R.id.text1};
SimpleCursorAdapter questions =
new SimpleCursorAdapter(this, R.layout.questions_one_row,
questionsCursor, from,to);
setListAdapter(questions);}
This displays only the question. If I put one of the answer alternatives first in the 'String[] from ...' statement, that gets displayed instead.
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Jun 24, 2010
What exactly does HTC Sense Clear Data actually clear? That may be a solution to reverting back to 5 homescreen pages instead of 7 without having to do a factory reset. Just curious as to what I am going to mess up? Will i just have to personalize the homescreen again, put widgets up, reconnect to fb, twitter, myfaves, etc. It's not going remove any 3rd party apps, just make me create new widgets, etc..?
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Sep 2, 2010
Following is my html content which i want to show in the webview using android sdk. It will displays only.
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Jun 22, 2010
i want to display a dialog in my android application where certain TextViews in the layout need to have content set during runtime. while showing the dialog itself is no problem at all, accessing the TextViews via TextView.setText(String) crashes the application.
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Dec 26, 2009
I've read the answer to a question as to how to access the contents of the databases, however I cannot seem to get it to work on my machine. Here is the shell log:
C:android-sdk-windows ools>adb -s emulator-5554 shell
# sqlite3 /data/data/com.android.demo.notepad2/databases/notes
sqlite3 /data/data/com.android.demo.notepad2/databases/notes
SQLite version 3.5.9
Enter ".help" for instructions
sqlite> .tables
.tables
sqlite> ^C
C:android-sdk-windows ools>
SQLite simply echos my commands back to me, even although the Eclipse file browser tells me it exists. If I use the sqlite3 tool and use ".tables" the commands are accepted.
Is the SQLite syntax different through the emulator is am I missing something?
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Feb 8, 2010
Is there a simple way to change the contents of a dialog box in Android without having to re-create the dialog box? I know that Activity.onCreateDialog() is only called once when the dialog first needs to be created, and this is where you initially set the dialog's contents. I need to change the dialog's contents later, so I'm wondering what is the proper way to do this.
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Oct 18, 2010
Can anybody help me about how to change the contents of spinner on run time in android.
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May 16, 2010
I've been progressively expanding my UI, and I want to add a ListView in the middle of my UI. When I add it and change the activity to extend a ListActivity instead of just an Activity, I'm getting a Force Close. Using 1.5. Does a ListView not work embedded in a RelativeLayout?
CODE:.........
XML looks like this:
CODE:..........
And the listrow.xml:
CODE:.............
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May 6, 2010
I have a Relative Layout.
Which has 2 buttons, side by side and it is right-aligned.
So this is my layout xml file. My question is there are no spacing between the right-most button and the right border of the RelativeLayout and between the 2 buttons. How can I add that? I play with android:paddingRight, but nothing helps. code...
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Jan 22, 2009
There is an repeating background attribute like in css for layout on Android API?
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Jul 15, 2009
I know my original post (at http://groups.google.com/group/android-developers/browse_thread/threa..., I could not find a way to perform a reply, maybe it's too old) is not sexy, but I'm now facing that problem in many situations. Let me please rephrase what I attempt to do, and what my problem is.
I have a RelativeLayout made of three widgets (named 1, 2 and 3 on the illustrations below): one attached to its parent left border (labelled 1), one to its parent right border (labelled 2) and the third (labelled 3) inserted between the 2 previous ones (its left border is attached to the first widget right border, and its right border is attached to the second widget left border). The third widget (the middle/central one laballed "3") is far taller than the two others, and I would like the first and second items (1 and 2) to be vertically centered with the middle widget.
I have resorted to the "android:layout_centerVertical" attribute for both the first and second widget, but I do not get the expected result. See at the bottom the various layouts I'm mentionning. Could someone please help me, and tell me whether what I intend to do is feasible, and how? Thank you for your time.
Layout with no "android:layout_centerVertical" specified: ------- |1|3|2| --|3|-- |3| ---
Layout with "android:layout_centerVertical" set to "true":
--- |3| |3| |3| ------- |1| |2| --- ---
What I'd like: --- --|3|-- |1|3|2| --|3|-- ---
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Nov 1, 2010
I've always been using RelativeLayout everytime I needed a View container, because of it's flexibility, even if I just wanted to display something really simple.Is it ok to do so, or should I try using a LinearLayout when I can, from a performance/good practices standpoint?
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Oct 27, 2010
I want a RelativeLayout to have a rounded corner just like we have it in the Iphone.Please let me know how can we do this in Android.
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Sep 20, 2010
I'm trying to center a button in relative layout, is this possible? I've tried the Gravity and Orientation functions but they don't do anything.
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Oct 13, 2010
Can anyone point me to a good one?
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Mar 17, 2010
I have a problem with two Textviews on the same height in a RelativeLayout running into each other.
I use the following Layout.
CODE:...........
This gives me this view:
Everything is as I need it except the two textviews name and information are displayed on the same screen space with the one on top of the other.
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Nov 24, 2010
Since I'm still just learning Android (and it appears Amazon says it'll be 2 months till I get the Hello, Android book) I'm still playing around with doing simple things. I have no problem getting an icon to display with the click of a button on my RelativeLayout using ImageView. The code for creating it is as follows:
private int mIconIdCounter = 1;
private ImageView addIcon(){
ImageView item = new ImageView(this);
item.setImageResource( R.drawable.tiles );
item.setAdjustViewBounds(true);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT );
if( mIconIdCounter != 1 ){
params.addRule(RelativeLayout.RIGHT_OF, 1 );
}
item.setLayoutParams( params );
item.setId( mIconIdCounter );
++m_IconIdCounter;.......................
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Jul 27, 2010
Can anyone tell me how can i do this using Java code or in activity class? I do not know how to set android: layout_alignParentBottom="true".I want to implement whole view via java code.
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Apr 28, 2010
I'm trying to build an android application that features a graphical display drawn within a RelativeLayout. I want to place "+" and "-" buttons next to several of the parameters, which are drawn at various points on the canvas. The positions are free-form don't seem to conform to any of the standard XML layouts.I know how to create the buttons programmatically, but I don't know how to place them over the canvas where I need them to be. I'm assuming that this would be done in the view thread's doDraw() method, after all the graphics have been drawn, but how?
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Apr 23, 2010
I have the following structure defined in an xml layout file.
<RelativeLayout android:id="@+id/mainLayout"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content" android:layout_height="wrap_content">
<FrameLayout android:id="@+id/frame" android:layout_centerInParent="true" android:layout_width="wrap_content" android:layout_height="wrap_content" ></FrameLayout>
<Button android:id="@+id/button" android:layout_below="@id/frame" android:layout_width="wrap_content" android:layout_height="wrap_content" />
</RelativeLayout>
The FrameLayout is positioned correctly in the center of its parent. But the Button isn't getting positioned under it. Instead it's displaying in the top left corner. Am I doing something incorrectly or is this a bug with RelativeLayout?
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