Develop Reference

Android make continues scrolling text within single view in repeat mode

I am trying to implement ticker board where you can see all ticker in scrolling mode check below image,
now I want continue scrolling for example
in #user5 after some space and start again with this same value no blank area like in init space
I want like this
scrolling text from one user 3 hours #user3 <some space> scrolling text from...
sorry for bad english
here is my code
View view = parent_layout.getChildAt(index);
// measures the unconstrained size of the view
// before it is drawn in the layout
view.measure(View.MeasureSpec.UNSPECIFIED,
View.MeasureSpec.UNSPECIFIED);
// takes the unconstrained width of the view
float width = view.getMeasuredWidth();
float height = view.getMeasuredHeight();
// gets the screen width
view.setLayoutParams(new LinearLayout.LayoutParams((int) width,
(int)height));
Log.e("contact details","width and screenwidth are" + width + "/"
+ screenWidth + "///" + view.getMeasuredWidth());
// performs the calculation
toXDelta = width - (screenWidth - 0);
// sets toXDelta to -300 if the text width is smaller that the
// screen size
if (toXDelta < 0) {
toXDelta = 0 - screenWidth;// -300;
} else {
toXDelta = 0 - screenWidth - toXDelta;// -300 - toXDelta;
}
// tickerList.add(view);
// animList.add(mAnimation);
// Animation parameters
mAnimation = new TranslateAnimation(screenWidth,
toXDelta, 0, 0);
mAnimation.setDuration(15000);
// mAnimation.setRepeatMode(Animation.RESTART);
mAnimation.setRepeatCount(Animation.INFINITE);
view.setAnimation(mAnimation);

My solution is just create double of string means appending current string with itself if the length is lower then screen width and using marquee feature in Textview.
private float screenWidth;
onCreate(){
TextView tv = (TextView)findViewById(R.id.textview);
Point outSize = new Point();
getWindowManager().getDefaultDisplay().getSize(outSize);
screenWidth = outSize.x;
StringBuilder ticker = new StringBuilder("This is my String");
do{
tv.setText(Html.fromHtml(ticker.toString()));
int w = ticker.length();
if(screenWidth>w){
ticker.append(" ");
ticker.append(tickerList.get(index));
tv.setText(Html.fromHtml(ticker.toString()));
}else
break;
}while(true);
}
xml code
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:ellipsize="marquee"
android:focusable="true"
android:focusableInTouchMode="true"
android:scrollHorizontally="true"
android:singleLine="true"
android:textSize="18sp"
android:padding="5dp"
android:id="#+id/textView1">
</TextView>

Android how to programmatically create scrollview and add programmatically created views into it

Alright I'm trying to build an activity that has a horizontal scrollview, that the user can swipe through, to view different "pages". My train of thought is these "pages" will be views. The following is a mockup of my idea (to mess around to see if it works)
I've experimented with this as follows:
My content view is set to the the scrollview. (unsure if this is an incorrect approach)
I create the scrollview, and place a view into it as follows:
private void setupScrollView()
{
Display display = getWindowManager().getDefaultDisplay();
DisplayMetrics outMetrics = new DisplayMetrics ();
display.getMetrics(outMetrics);
float density = getResources().getDisplayMetrics().density;
float dpHeight = outMetrics.heightPixels / density;
float dpWidth = outMetrics.widthPixels / density;
int width = (int)MeasureUtils.convertDpToPixel(dpWidth, getApplicationContext());
int height = (int)MeasureUtils.convertDpToPixel(dpHeight, getApplicationContext());
_scrollView = new HorizontalScrollView(getApplicationContext());
_scrollView.setBackgroundColor(Color.CYAN);
_scrollView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
Log.i("DEBUG", "Screen dp width = " + dpWidth + " screen dp height = " + dpHeight);
TextView view = new TextView(getApplicationContext());
view.setBackgroundColor(Color.RED);
view.setText("TEST");
view.setX(0); // Start at the left of the scrollview.
view.setWidth(width); // Size it so that it fills to the right of the scrollview.
TextView view2 = new TextView(getApplicationContext());
view2.setBackgroundColor(Color.GREEN);
view2.setText("TEST2");
view2.setX(width); // Start the second "page/view" offscreen to the right where i can scroll to it
view.setWidth(width); // Fill the screen width
LinearLayout layout = new LinearLayout(getApplicationContext());
layout.setBackgroundColor(Color.MAGENTA);
layout.addView(view);
layout.addView(view2);
_scrollView.addView(layout);
}
The idea above is that I will see a view, that takes up the screen, representing a page. This view should be "RED" in color. I can then scroll horizontally to the right and see the second view (view2) representing the next page. This view should be "GREEN" in color. This does not happen. I end up seeing what looks like 1/3rd or 1/2 of my screen being view1, the linearlayout taking up almost the whole screen (a bit of a gap to the right edge where the CYAN from the scrollview bleeds through).
Am I approaching this the wrong way, and/or is it possible to make this work the way I'm going at it?

You probably do not want to use a horizontalscroll view to create "pages".
Try looking at PageViewer
This automatically builds in all the sywpe and inflating logic for you.
Basically you will get a call to inflate a certain page. There you can then create your view (dynamically if you wish) and then just return the root to be rendered.

Alright I've figured out what I was doing wrong, and it turned out to be something very small...
The complete code is here:
private void setupScrollView()
{
Display display = getWindowManager().getDefaultDisplay();
DisplayMetrics outMetrics = new DisplayMetrics ();
display.getMetrics(outMetrics);
float density = getResources().getDisplayMetrics().density;
float dpHeight = outMetrics.heightPixels / density;
float dpWidth = outMetrics.widthPixels / density;
int width = (int)MeasureUtils.convertDpToPixel(dpWidth, getApplicationContext());
int height = (int)MeasureUtils.convertDpToPixel(dpHeight, getApplicationContext());
_scrollView = new HorizontalScrollView(getApplicationContext());
_scrollView.setBackgroundColor(Color.CYAN);
_scrollView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
Log.i("DEBUG", "Screen dp width = " + dpWidth + " screen dp height = " + dpHeight);
TextView view = new TextView(getApplicationContext());
view.setBackgroundColor(Color.RED);
view.setText("TEST");
view.setX(0);
view.setWidth(width);
view.setHeight(height - 50);
TextView view2 = new TextView(getApplicationContext());
view2.setBackgroundColor(Color.GREEN);
view2.setText("TEST2");
view2.setX(0);
view2.setWidth(width);
view2.setHeight(height - 50);
LinearLayout layout = new LinearLayout(getApplicationContext());
layout.setBackgroundColor(Color.MAGENTA);
layout.addView(view);
layout.addView(view2);
_scrollView.addView(layout);
}
This creates a horizontal scrollview programmatically, as I had, but the problem was that I was setting the second view to be "width" away, when it should be set to "0"as can be seen by:
view2.setX(0);
With that, I get 2 "views" that resemble pages in my scrollview that I can swipe through. Each taking up the whole page.
Hate having the code close and it being a simple fix that I missed :|
Hope this helps anyone else that tries to do it this way. I'm going to look into the PageViewer as Frank suggested.

Android place TextView depends on its center

How to place TextViews on layout depends on TextView's center from code?By default we can create it depends on its top left angle. Method setGravity(Gravity.CENTER_HORIZONTAL) doesn't help.
EDIT
I want to place TextViews in circle. For what I use RelativeLayout. Within layot TextViews place in for-loop with some angle step. Here some code
for (int i = 0; i < 62; i++) {
TextView word = new TextView(context);
word.setTextSize(13);
// word.setGravity(Gravity.CENTER_HORIZONTAL);
word.setTextColor(Color.BLACK);
RotateAnimation rotateAnimation = new RotateAnimation(0,
angle.get(i), 0, (float) (textHeight * 0.9 + rotateCircle));
rotateAnimation.setFillAfter(true);
rotateAnimation.setDuration(100);
rotateAnimation.setStartOffset(100);
word.setAnimation(rotateAnimation);
word.setGravity(Gravity.CENTER);
word.setPadding(10, 10, 10, 10);
RelativeLayout.LayoutParams layoutparams = new RelativeLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
layoutparams.leftMargin = Math.round(x_coords.get(i));
layoutparams.topMargin = (int) (Math.round(y_coords.get(i)
- textHeight * 0.9 - rotateCircle));
textviews.add(word);
words_layout.addView(word, layoutparams);
}

The gravity of a TextView controls how its content is aligned (the text), not how the view itself is aligned in the layout. To control how the View is aligned in the layout use the android::layout_gravity attribute instead, or the gravity field in the LayoutParams.

Use the android:layout_gravity = CENTER_HORIZONTAL to make text view in center.

Android button not resizing when put in table programmatically

I need to change the size (specifically the height) of a button in an Android app where the button resides in a table and is created programmatically. I have tried about 20 different approaches and failed miserably. If I create a button outside the table, I can change the size without a problem, but as soon as it goes in a table, the height stays fixed even though I can change the width.
I have tried creating and using, LinearLayout params, ViewGroup layout params, TableLayout params, etc. and setting their heights either via that constructor (e.g WRAP_CONTENT) or using setHeight(). I have also tried simply calling button.setHeight(). I have changed settings in my xml manifest for the table as well. I have used pixel values and Dpi values. All of this has failed. Here is the basics of what I have so far (just showing a call to b.setHeight()):
TableRow row = new TableRow(getApplicationContext());
row.setId(counter);
TextView t = new TextView(getApplicationContext());
t.setText("BLH " + counter);
t.setTextColor(Color.BLACK);
//I have also tried table.getContext() in this constructor...
Button b = new Button(getApplicationContext());
b.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v)
{
//blah blah blah
});
//Convert from pixels to Dpi
final float scale = getResources().getDisplayMetrics().density;
int heightDp = (int) (33 * scale + 0.5f);
int widthDp = (int) (60 * scale + 0.5f);
b.setText(R.string.removeButtonText);
b.setTextSize(12);
b.setTag(counter);
b.setHeight(heightDp);
b.setWidth(widthDp);
b.setId(counter);
counter++;
row.addView(t);
row.addView(b);
// add the TableRow to the TableLayout
table.addView(row,new TableLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
This correctly results in a button being placed in the table, but the height does not change no matter what values I use. In my xml file, here is what the table declaration looks like:
<TableLayout
android:id="#+id/myTable"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="20dp"
android:stretchColumns="0">
</TableLayout>
I have tried messing with stretchColumns and other settings here; again, to no avail. Does anyone have any idea why I can't change the height of a button added to my table programmatically, but have no problems doing so outside the table? I am sure it is some setting or adjustment that I just haven't found. Any help is appreciated as I am at my wits end. Thanks in advance.

I fixed my problem. Turns out it was an ordering issue. The problem is that I was setting the height before adding the button to the table. This caused the button's LayoutParams to not have any parent as explained here: ViewGroup.getLayoutParams(). Here is what I needed to do (basically, change height after adding the button to the table):
table.addView(row,new TableLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
//now change the height so the buttons aren't so big...
final float scale = getResources().getDisplayMetrics().density;
int heightDp = (int) (33 * scale + 0.5f);
ViewGroup.LayoutParams params = b.getLayoutParams();
params.height = heightDp;
b.setLayoutParams(params);
b.requestLayout();
table.requestLayout();
The last two lines were suggested above by Lawrence. The table and button seemed to update without these. However, it seemed to me to be a good idea to update just in case.

Try this
int heightDp = (int) (33 * scale + 0.5f);
int widthDp = (int) (60 * scale + 0.5f);
ViewGroup.LayoutParams bLp = new ViewGroup.LayoutParams(widthDp,heightDp);
b.setLayoutParams(bLp);
instead of
b.setHeight(heightDp);
b.setWidth(widthDp);

I think you need to call View.requestLayout, this is not done automatically every time you add/remove child views.

Android, programmatically layout a button view?

I am trying to programmatically define my program layout and add a button to it at a certain position. I am not using the layout xml as the content view.
RelativeLayout mainLayout;
mainLayout = new RelativeLayout(this);
mainLayout.setLayoutParams(new
LayoutParams(LayoutParams.FILL_PARENT,android.view.ViewGroup.LayoutParams.FILL_PARENT));
I have then added a button that I want to apply the properties
layout align center
parent align left
height 60px
width 60px
here is the button so far
Button BtnNext = new Button(this);
BtnNext.setWidth(60);
BtnNext.setHeight(60);
BtnNext.setFocusable(true);
BtnNext.setId(idBtnNext);
BtnNext.setText("Next");
mainLayout.addView(BtnNext, 1);
Height and width DON'T work correctly.

Hi you can try by setting layout params
RelativeLayout.LayoutParams rel_btn = new RelativeLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
rel_btn.height = 60;
rel_btn.width = 60;
BtnNext.setLayoutParams(rel_btn);
You can also add rules and set margins for Button by setting relative layout params like
rel_btn.addRule(RelativeLayout.CENTER_VERTICAL);
rel_btn.leftMargin = 220;

Height and width will not be as u wished because your are not using Density-independent pixel (dip)
The value you set here is in pixel
You can convert the pixel into dip by
final float scale = getResources().getDisplayMetrics().density;
int dip = (int) (60 * scale + 0.5f);
You will get more accurate result