Android :: Adding Scroll Bar To A Custom ViewGroup ?
Aug 2, 2010
I've got the following node in my XML layout:
CODE:.................
TagLayout is a class that extends ViewGroup, and basically holds a bunch of buttons with text (a custom object that act as tags, but that's neither here or there).
The problem is that when there are too many buttons, the view no longer scrolls. I can confirm that I am adding tags but I can't see anything.
If I wrap the above within a ScrollView, the layout never renders. I tried adding the attributes android:isScrollContainer and android:scrollbars, but that doesn't change anything. Is there something I'm missing here?
I should also add that TagLayout is overriding the onMeasure() event. I guess I need to implement a scrolling mechanism there...?
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May 24, 2010
I am trying to create a ListView and add it to a custom ViewGroup.
Here is my code:
CODE:.................
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Nov 17, 2010
I have a custom ViewGroup that I wrote, and have been able to use it to lay out child elements in code just fine. However, now I'd like to be able to use it for layout in XML. I would also like to be able to add some custom attributes to the XML file to better control my layout. How do I set up, both in XML and in code, a set of custom attributes? Bonus if it can be used with the built in designer in Eclipse.
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Oct 19, 2010
I've extended ViewGroup to achieve something like a FlowLayout.I put my custom ViewGroup into a ScrollView, dynamically add a bunch of content and it doesn't scroll.The content that flows off the screen is not viewable.What am I missing, how can I allow my ViewGroup to be compatible with ScrollView?
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Nov 25, 2009
I am trying to add a view to a viewgroup but I am getting the following error when I run the application
Error: E/AndroidRuntime( 570): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. Code: public class ExampleApp extends ViewGroup{
private LayoutParams mLAyoutParams; AlbumArtImageView mAlbumArtThumnail;
static final String TAG = "ExampleApp";......................
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May 19, 2010
I am new to Android, and I am trying to understand how to create a custom ViewGroup. I created MyViewGroup as follows: Code...
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Jun 17, 2009
I want to have a ViewGroup with another View in it. The user should be able to move the other View around the ViewGroup, and fling it away. However, the inner View shouldnt only move, it should also scale and so on (so we dont restrain ourselves to just movements). I don't really know the best way to implement it.
First I though about using a ViewGroup pretty much as it is (i.e. take advantage of the already-written methods). Then I could do the flinging with an Animation. However, when I move the View around with my finger, wouldnt I have to do a requestLayout, since the View changes size when I move it? Or could I just set a transform?
The other alternative would be to override the draw-method and do most of the work myself. For instance, when the user moves his/her finger, I could get a cache of the View and just paint it on the Canvas (with some transform). However, how would I do the flinging then, without an Animation? I could use a Scroller/VelocityTracker, but What would "drive" the repaints? Which is the best way to do this? Also, I won't have just one View, but a couple of them, so I'd like the solution to be effective.
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Sep 26, 2010
I have a custom ViewGroup. The idea is to be able to place controls at absolute positions and then have the ViewGroup scale those controls based on the difference in the screen dimensions with respect to the original design dimensions. I am using the code below. In response to the 'onMeasure' message, I am storing the width and height of the view. Then on the 'onLayout' message I am computing new dimensions for the child controls and adjusting their sizes proportionally. This all works to some degree. However for certain controls (e.g. button controls), the control resizes, but the text inside does not remain centered within the control. I am thinking that there is some other call I need to make to update the child controls after I change their size.
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Nov 8, 2010
I asked about adding images and text and I was told to put it in to a xml. Now my text goes farther than the xml. Is there a way I can add a scroll to it or will I have to go about another route to get the effects I need.
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Jun 11, 2009
<LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/Layoutbuttons"> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/Bsave" android:text="Save"></Button> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Clear" android:id="@ +id/Beditclear"></Button> </LinearLayout>
<LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/Ledititems" android:orientation="vertical" android:scrollbars="vertical" android:scrollbarStyle="insideInset" android:scrollbarAlwaysDrawVerticalTrack="true" android:fadingEdge="vertical" android:fadingEdgeLength="8px"></ LinearLayout>
</LinearLayout>
I am adding dynamicly created EditTexts to the last vertical LinearLayout:
ArrayList<EditText> arrayedititems; edititems = (LinearLayout) findViewById(R.id.Ledititems);
arrayedititems.add( new EditText(globalcontext) ); //multiple times to add many EditTexts .... edititems.addView(arrayedititems.get(lastindex) );
Now all the edittexts are being added fine and show up on the linearlayout, the problem is I get no vertical scrollbar and can not scroll the linearlayout (you can a see large number of failed attemptes in the xml entry to enable this scrolling, such as forcing scrollbars or setting to vertical) Do I need to call some sort of invalidate() or notifyDataSetChanged() like with an arrayadapter to update the LinearLayout into checking if it needs to enable scrolling?
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Oct 7, 2010
Is there any chance of making Scroll bar like this by using existing android's Scroll view s .
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May 3, 2010
How can I set custom thumb for fast scroll in listview.
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Mar 10, 2010
So my layout looks basically like this:
<ScrollView>
<RelativeLayout>
<BunchOfViews/>
<ImageView android:layout_alignParentBottom="true"/>
</RelativeLayout>
</ScrollView>
I have the ScrollView so all of the layout always is visible no matter the height of the screen. The problem is that on a very high screen, I still want my imageview to be at the bottom. However, a child of a ScrollView dont seem to have a defined bottom. The View is placed at the top of the layout. How can I solve this problem in a neat way?
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Aug 4, 2010
I have a listview with a custom arrayadapter that handles about 15 strings. The style of each row alternates (between labels and values for those labels--for example row 1 could be "email address" and row 2 would be the actual email address). I'm changing the style of each row to alternate like this in the arrayadapter's getView() method. So if the item at the current position is a label, I'll change the styling from the default row style (which is what the values have applied to them). When the listview first loads, the styling is perfect and just how I want it to be. If I scroll the list slowly up or down, it stays that way. However, if I scroll the list fast up and down, the styling of the value rows starts changing to that of the label ones until all of the rows have the styling of a label row. I've used custom adapters on other listviews in the app with no problems like this. Found out that it also changes all of the rows to the label styling on portrait->landscape orientation changes. Doesn't do this on landscape->portrait changes. Below is the adapter I'm using.
public class DetailsAdapter extends ArrayAdapter<String> { private TextView text = null; private String item = null;
public DetailsAdapter(Context context, int resource, int textViewResourceId, String[] objects) { super(context, resource, textViewResourceId, objects);
} @Override public View getView(int position, View convertView, ViewGroup parent) { text = (TextView) super.getView(position, convertView, parent); item = getItem(position);
if (item.equals("Name") || item.equals("Mobile") || item.equals("Home") || item.equals("Email") || item.equals("Address")) { text.setBackgroundColor(0xFF575757); text.setTextSize(15);
text.setTypeface(null, Typeface.BOLD); text.setPadding(8, 5, 0, 5);
} else { text.setPadding(15, 15, 0, 15); } return text;
} @Override public boolean isEnabled(int position) { item = getItem(position);
if (item.equals("Name") || item.equals("Mobile") || item.equals("Home") || item.equals("Email") || item.equals("Address")) { return false;
} else { return true; } } }
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Apr 22, 2010
I was attempting to add a custom view in XML, but I kept getting force closes. It works fine when I just find the parent and use addView() so it isn't the code. I'm pretty sure I'm just getting the constructors wrong. Does anyone have any experience with this?
Here's what I've got:
CODE:................
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Mar 5, 2010
I am working on adding vertical and horizontal scrollbars in a custom drawn View. I have overridden the compute*ScrollOffset, compute*ScrollRange, etc methods and have enabled the scrollbars by called set*ScrollBarEnabled. However, I do not see the scrollbars in my View, even after a call to scrollBy, which according to the documentation calls awakenScrollbars (I assumed awakenScrollbars is not required as the scrollbars do not auto-fade - isScrollbarFadingEnabled returns false).
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Jul 31, 2010
I am trying to add a custom data field to a contact, its UID is known.
I have not yet understood what exactly I should do. I saw and tried other code , but to no success.
CODE:..........
And "mod" is always 0.
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Jul 5, 2010
Is there any way to add custom fonts to handcent? I have all the 5 font packs but wanted to add my own.
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Sep 15, 2010
I was looking over this code about extending an ImageView: http://marakana.com/forums/android/examples/98.html
And i was wondering how can i add the new View to an existing xml layout file, along with some other views.
Already i did this inside my main linear layout:
CODE:..........
But the problem is that this way the onDraw method doesn't get called.
Maybe some examples where you combine CustomViews with xml layout.
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Aug 19, 2010
I have a widget that displays a set of information. What I would like to do is to give the user the opportunity to choose the background color/image. I would like to have a popup when the user is selecting the widget to choose the background. So how would I make the popup? And how would I apply the background dynamically?
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May 11, 2013
is there any method to add widget into custom roms.I want to add HTC clock and calendar widget into cyanogen mod 10.1 rom for huawei ascend p1.
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Jul 6, 2010
I know this exists, but I'm not quite understanding what step two means when it says mount my system partition. Any help would be greatly appreciated.droidsp0t - The Incredible Resource Want Facebook Sync back on your custom ROMs?
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Jun 15, 2010
I followed all the instructions on the other really long thread. I am having one issue though. I installed SDK and the drivers, that all went perfect. The only issue I am having is with the actual bootanimation.zip. I am thoroughly stuck. After I download a bootanimation.zip it shows up in winrar with 4 files (loading, eye, android, and the desc.txt) I know it has to go in tools. I am just not sure how? Do I add each folder or is there a way to add them all? I also know the name has to be bootanimation.zip. I tried a few different ways and pushed it to my Inc. But I cant get it to boot with the animation.
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Jul 19, 2010
I've been getting annoyed at being unable to assign my ringtones to my gmail synced contacts. Something that was a non issue on my old faithful G1.Samsung, it seems, has seen fit to screw with the contact management making it necessary to have a contact in the phone memory proper to assign a custom ringtone.I have found a simple solution. Download Ringo Lite from the market place. It will allow you to assign ringtones to any contact on the phone in a really simple manner and the app is free. It has other features like assigning rings to sms messages and stuff but I don't care about that or need that. But for setting ringtones it works just dandy.
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Apr 19, 2010
I have text area and and down to that "ok" and "cancel" button. when i click on text area keyboard appear and focus on the text area and buttons get hide behind the keyboard.
I want when text area get focus scroll a little bit and also display the bottom buttons while text area id selected.
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Jun 24, 2010
I've got this odd problem which is happening on 1.6, 2.2, and a MyTouch 3G Slide (which is API #7, and listed as "2.1-Update1" in the Android Device Chooser). If anyone can explain what I'm doing wrong & how to fix it (or possibly confirm that this is an Android bug)The basic idea for my app is to make a stopwatch-sort of thing, in that the user can tap a button to start a timer, then tap it again to stop (pause) the timer; further taps alternate between resuming the timer and pausing the timer.I've got a top-level ScrollView which contains a RelativelLayout, which contains a bunch of widgets. The first widget is a HUGE button (so that it's easy to press), which pushes all my other widgets below the bottom of the screen. This is intentional, as I want to rely on the ScrollView (and an on-screen reminder to the user) to make the rest of the input options available.I've got a simple state-machine type setup, where mState is the current mode (STATE_ TIMER_ NOT_ STARTED before the user presses any buttons, RUNNING after the first press, and then PAUSED after the second, back to RUNNING after the third, etc, etc).
All this works great EXCEPT that when the timer is running, and the user presses the start/stop/resume button again, the ScrollView will scroll down a ways. I am NOT issuing this command (I don't even have a reference to ScrollView object), and I'm not sure why it's doing this.
REPRO:Compile + run the below samples. When the app starts, press the 'Start Timing' button. Use your thumb (or the mouse) to touch-drag the screen upwards (so you can see the RatingBar), then drag it back downwards (so the button is again completely on-screen). Tap the button (which now reads 'PauseTiming') again, and it'll jump down a bit. It should NOT be jumping/scrolling down, since there's no statement (that I can see) that tells it to scroll down. As near as I can tell, it's the setText that causes the scrolling ( when I comment those lines out, no scrolling occurs).WHAT I'M ASKING FOR:if I'm doing something dumb & you could point out what it is, I'd really appreciate it! I wonder if 'touch mode' might have something to do with this, since it does NOT appear to happen (in the emulator) when I use the mouse's scroll wheel to move the panel upwards (i.e.,instead of the simulated finger-dragging). I can't find a whole lot on touch-mode, and nothing specific on focus/selection in touch mode within a ScrollView if you can confirm that this error occurs for you too, that would be ok, too (since misery loves company.AHEM I mean, since it might help confirm that it's not just me MyTestApp.java package bug.android.scrollview;
import android.app.Activity;
import android.os.Bundle;
import android.text.format.Time;
import android.view.Display;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.TextView;
public class MyTestApp extends Activity {
public final static int STATE_TIMER_NOT_STARTED = 1;
public final static int STATE_TIMER_RUNNING = 2;
public final static int STATE_TIMER_PAUSED = 3;
private int mState;
Time t = new Time();
private Time data = new Time();
private Button btnStartStopResume;
private TextView lblSpacer;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.new_time_entry);
btnStartStopResume = (Button) findViewById(R.id.btnStartStopResume);
// Set the button's size so that the other info will also be visible
Display display = ((WindowManager) getSystemService(WINDOW_SERVICE))
.getDefaultDisplay();
// This is such a hack, but the windowScroller doesn't appear to
// have a height at this point in the lifecycle (nor in 'onResume' :( )
btnStartStopResume.setHeight(display.getHeight() - 200);
lblSpacer = (TextView) findViewById(R.id.lblSpacer);
reset();
} public void doStartStopResume(View v) {
if (mState == MyTestApp.STATE_TIMER_NOT_STARTED) {
mState = MyTestApp.STATE_TIMER_RUNNING;
data.setToNow();
} else if (mState == MyTestApp.STATE_TIMER_RUNNING) {
mState = MyTestApp.STATE_TIMER_PAUSED;
String s = getString(R.string.add_scroll_down_to_add);
lblSpacer.setText(s);
} else if (mState == MyTestApp.STATE_TIMER_PAUSED) {
mState = MyTestApp.STATE_TIMER_RUNNING;
public void doReset(View v) {
}public void doNewRunClick(View v) {
public void doAddTiming(View v) {
public void reset() {
mState = STATE_TIMER_NOT_STARTED;
new_time_entry.xml
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/windowScroller"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
> <RelativeLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
> <Button
android:id="@+id/btnStartStopResume"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dip"
android:text="Start Timing"
android:textSize="40dp"
android:height="290dp"
android:onClick="doStartStopResume" />
<TextView
android:id="@+id/lblSpacer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/btnStartStopResume"
android:layout_centerHorizontal="true"
android:text="@string/add_scroll_down_for_more" />
<TextView
android:id="@+id/lblTimeStartLabel"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/lblSpacer"
android:layout_alignParentLeft="true"
android:clickable="true"
android:onClick="adjustStartTime"
android:text="Start of this run:"
android:textSize="8dp" />
<TextView
android:id="@+id/lblTimeStart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/lblTimeStartLabel"
android:layout_alignParentLeft="true"
android:clickable="true"
android:onClick="adjustStartTime"
android:text="--:--:-- --"
android:textColor="#FFFFFF"
android:textSize="26dp" />
<TextView
android:id="@+id/lblElapsedLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/lblSpacer"
android:layout_alignRight="@id/lblSpacer"
android:layout_marginRight="5dp"
android:text="Elapsed Time:"
android:textSize="8dp" />
<TextView
android:id="@+id/lblTimeElapsed"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/lblElapsedLabel"
android:layout_alignRight="@id/lblSpacer"
android:layout_marginRight="5dp"
android:textColor="#99ff66"
android:text="-- m -- sec"
android:textSize="26dp"
android:layout_marginBottom="10dip"/>
<CheckBox
android:id="@+id/chkNewRun"
android:onClick="doNewRunClick"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/lblTimeElapsed"
android:text="This is a new run of timings"
android:layout_marginBottom="10dip" />
<TextView
android:id="@+id/lblIntensity"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Intensity (1 = none 5 = max)"
android:layout_below="@id/chkNewRun" />
<RatingBar
android:id="@+id/rbIntensity"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/lblIntensity"
android:numStars="5"
android:rating="2"
android:layout_marginBottom="5dip" />
<TextView
android:id="@+id/lblNotes"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Notes:"
android:layout_below="@id/rbIntensity" />
<EditText
android:id="@+id/txtNotes"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@android:drawable/editbox_background"
android:layout_below="@id/lblNotes"
android:layout_marginBottom="10dip" />
<Button
android:id="@+id/btnReset"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/txtNotes"
android:layout_alignParentLeft="true"
android:layout_marginLeft="10dip"
android:layout_marginRight="10dip"
android:text="Reset"
android:onClick="doReset" />
<Button
android:id="@+id/btnOk"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/txtNotes"
android:layout_toRightOf="@id/btnReset"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dip"
android:layout_marginRight="10dip"
android:text="Add Timing To List"
android:onClick="doAddTiming" />
</RelativeLayout>
</ScrollView>
strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">Timer</string>
<string name="dlg_edit_timing_title">Edit A Timing</string>
<string name="add_scroll_down_for_more">< Scroll down for more options! ></string>
<string name="add_scroll_down_to_add">< Scroll down to save this timing! ></string>
<string name="start_timing">Start Timing
</string>
<string name="stop_timing">Pause Timing
</string>
<string name="resume_timing">Resume Timing
</string>
</resources>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="bug.android.scrollview"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".MyTestApp"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-sdk android:minSdkVersion="5" />
</manifest>
UPDATE 1: Adding if( btnStartStopResume.isInTouchMode() )
Toast.makeText(this, "TOUCH MODE", 2000);
elseToast.makeText(this, "NOT touch mode", 2000);
then setting breakpoints in the debugger confirms that the button is always in touch mode (regardless of whether I finger-drag the panel up/down, or mouse-wheel it up/down). So it's a combination of being in touch-mode AND finger-dragging the panel after the 2nd button-press (i.e, when the app is in 'stopped/paused timing' mode) that's causing the odd extra-timing in subsequent pauses.
UPDATE 2:
I just noticed that it's scrolling down to the EditText, and no further. It looks like when you move the panel down the EditText gets the selection, and after the click event the ScrollView scrolls back to the thing that has the selection. Seems to explain why the mouse-wheel approach doesn't have this problem (it moves the selection/focus back up to the button).
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Jun 21, 2010
I want to have a dynamic table, with rows added over time as a result of user interaction, using a TableLayout inside a ScrollView. This works fine, but when I want to scroll to the end of the table using fullScroll(), it always leaves out the last line; that is, it scrolls so that the one before the last one is visible. The last line is visible when scrolling manually, and the scrollbar is correct too.I'm of course open to suggestions as to how to make a better layout out of this; but I'm specifically interested in understanding why fullScroll() behaves that way. Should I give it a different parameter, or use something else altogether? Or does it do that because the newly added line isn't yet visible somehow? (if so, how can I solve that?) Or did I miss some other obvious thing?The following code replicates the problem: TestActivity.java:
package com.example.android.tests;
import java.util.Random;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ScrollView;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;
public class TestActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
((Button) findViewById(R.id.AddRow)).setOnClickListener(new View.OnClickListener() { public void onClick(View v) {
Random rnd = new Random();
TableRow nr = new TableRow(v.getContext());
for (int c=0; c<3; c++) {
TextView nv = new TextView(v.getContext());
nv.setText(Integer.toString(rnd.nextInt(20)-10));
nr.addView(nv);
}((TableLayout) findViewById(R.id.Table)).addView(nr);
// Scrolls to line before last - why?
((ScrollView) findViewById(R.id.TableScroller)).fullScroll(View.FOCUS_DOWN);
}main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button
android:text="Add Row"
android:id="@+id/AddRow"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true" />
<ScrollView
android:id="@+id/TableScroller"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_above="@id/AddRow"
android:layout_alignParentTop="true" >
<TableLayout
android:id="@+id/Table"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:stretchColumns="0,1,2" />
</ScrollView>
</RelativeLayout>
Edit: for reference, I implemented Romain Guy's solution as follows:In TestActivity.java, replace:
// Scrolls to line before last - why?
((ScrollView) findViewById(R.id.TableScroller)).fullScroll(View.FOCUS_DOWN);
// Enqueue the scrolling to happen after the new row has been layout
((ScrollView) findViewById(R.id.TableScroller)).post(new Runnable() {
public void run() {
((ScrollView) findViewById(R.id.TableScroller)).fullScroll(View.FOCUS_DOWN);
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Mar 12, 2009
It looks like the standard ScrollView does not support horizontal scroll. Has anyone implement a ScrollView with horizontal scroll support? It would be appreciated if you can share it.
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Oct 16, 2010
I have 2 ScrollViews in my android layout. How can I synchronise their scroll positions?
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Nov 20, 2009
is there no way to change the timeout to scroll in ScrollView? In the source, it's set to: static final int ANIMATED_SCROLL_GAP = 250; so any drags will be blocked for 250ms. This has the appearance of the ScrollView being stuck for a bit before it moves. This makes small scroll gestures difficult to work with. There's no way around this?
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