Develop Reference

Have an ImageView with a default height, change height when an image is put into it

So I am making an app that holds multiple user-chosen pictures. I have default ImageViews with pre-set heights of 300dp. I want this height to change to wrap_content once an image has been placed into the ImageView. The only way I know to do this is to remove the image from the layout and then re-add it with a new LayoutParams, but this messes up the order of the other views in my layout. Can I change the height without removing it?
Essentially:
LinearLayout mainLayout = (LinearLayout) findViewById(R.id.mainLayout);
final float scale = getResources().getDisplayMetrics().density;
LinearLayout.LayoutParams mTestImgParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
(int) Math.ceil(scale * 300)
);
final ImageView createdView = new ImageView(this);
mainLayout.addView(createdView, mTestImgParams);
//onLongClick listener, get picture, set the picture into the imageview, etc.
I somehow want to change the
(int) Math.ceil(scale*300)
to
LinearLayout.LayoutParams.WRAP_CONTENT
without removing and re-adding the ImageView, and only after the image has been placed. Help please.

You could try to get the current layout params and change it.
LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) createdView.getLayoutParams();
params.height = LayoutParams.WRAP_CONTENT;
createdView.setLayoutParams(params);

How to programmatically set the width of the LinearLayout?

Is the source of the slider and the lesson link:
http://www.oodlestechnologies.com/blogs/Facebook-Style-Slide-Menu-In-Android
In this case, the width of the file "left_menu.xml" determined TextView (android:layout_width="260dp")
How do I set the width to "LinearLayout" file "left_menu.xml" depending on the device screen? For example, I want the width of the "LinearLayout" was always 1/3 of the screen device? Or any way to set the width of the TextView 1/3 of the width of the device screen.

To set the LinearLayout or TextView width to 1/3 of the device screen:
first of all get the device screen width:
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
try {
display.getRealSize(size);
} catch (NoSuchMethodError err) {
display.getSize(size);
}
int width = size.x;
int height = size.y;
now just create a LayoutParams and set it to the Text:
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams((int)(width/3),
LinearLayout.LayoutParams.WRAP_CONTENT); // or set height to any fixed value you want
your_layout.setLayoutParams(lp);
// OR
your_textView.setLayoutParams(lp);

LinearLayout linear = (LinearLayout) findViewById(R.id.ll);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
linear.setLayoutParams(params);
As you can see, you can set Integer values for the LinearLayout.LayoutParams() constructor, like this:
LinearLayout.LayoutParams cellParams = new LinearLayout.LayoutParams(0, 100);
The costructor wants pixels and not dp(Density Pixels), here's a formula to convert PXs from DPs:
(int) (<numberOfDPs> * getContext().getResources().getDisplayMetrics().density + 0.5f)

LinearLayout layout = (LinearLayout)findViewById(R.id.ll);
LayoutParams params = (LayoutParams) layout.getLayoutParams();
params.height = 100;
params.width = 100;

The above answers are correct. I'll just suggest future readers to take a look at their xml layout file and be sure that the LinearLayout element is not using weight attribute. If so, consider updating weight in your LayoutParams object.
Another good practice is to retrieve the layout params object from the view you're trying to adjust, instead of creating one from scratch and having to set all the values.

LinearLayout YOUR_LinearLayout =(LinearLayout)findViewById(R.id.YOUR_LinearLayout)
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(
/*width*/ ViewGroup.LayoutParams.MATCH_PARENT,
/*height*/ 100,
/*weight*/ 1.0f
);
YOUR_LinearLayout.setLayoutParams(param);

The easy way to do that, set value of layoutParams, and please notice this size is not in DP.
view.layoutParams.width = 400;
view.layoutParams.height = 150;
view.requestLayout();

Fill the layout with variable count of TextViews

I need to show the TextViews based on the info received from a server. E.g. I got 7 words from the server . I need to put every word in a different TextView to make it clickable. The textviews should fill the screen of the device from left to right in the lines. When the right border is reached then the next TextViews should be placed on the next line and so on.
The quantity of TextViews is variable and the words in the Textviews is different as well.

Create new textView instance and setLayoutparams to them.
Example,
TextView[] tx = new TextView[10];
TableRow[] tr = new TableRow[10];
for(i=0; i<10; i++) {
tx[i] = new TextView(this);
tx[i].setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
tx[i].setText("Data")
tr[i] = new TableRow(this);
tr[i].setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
tr[i].addView(tx[i]);
// and then adding table row in tablelayout
}

For your problem you can use single textview and set spannable string to the textview.
Within that string you can provide clicks you want.

I found the solution.
I won't put the whole code here. Only main parts.
There is vertical LinearLayout.
We need to calculate the width of the layout. I couldn't do it because I do all calculations before it is drawed.
I'm getting the screen width in dips:
Display display = ((Activity) context).getWindowManager().getDefaultDisplay();
DisplayMetrics outMetrics = new DisplayMetrics();
display.getMetrics(outMetrics);
float density = getResources().getDisplayMetrics().density;
float dpWidth = outMetrics.widthPixels / density;
int displayWidth = (int) dpWidth;
This is the free space available to put the Textviews.
Add LinearLayout to parent. Create a Textview and calculate the width:
// Calculate size of the button
Rect bounds = new Rect();
Paint textPaint = menuCategoryTV.getPaint();
textPaint.getTextBounds(text, 0, text.length(), bounds);
int width = bounds.width();
Then check if there is a room to place the Textview in the layout. To get it deduct TextView's width from available free space on the screen. Of course there is a space for the first textView. Until your TextView is not very long. But after filling up the layout by TextViews there will be no room for new elements. Create new LinearLayout, add it to parent and reset availble room to initial value.

How to set a desired layout for an animating fragment?

I have a fragment which is animating from right to left. I want to set it to stop at like 100 units from the left part of the screen. This is what i did so far.
RelativeLayout tempLi;
Display display = MyActivity.context.getWindowManager().getDefaultDisplay();
final int width = display.getWidth();
tempLi.setLayoutParams(new LayoutParams(width-100, LayoutParams.FILL_PARENT));
This line of code is getting the layout 100 units short from the right side. I tried doing -width + 100 , it didn't work.
Any suggestions will be appreciated. TIA

You can set the left-margin to the layout as follows:
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
layoutParams.setMargins(100, 0, 0, 0);
tempLi.setLayoutParams(layoutParams);

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