I want to create a function that takes in an array of text and creates buttons and adds them to the view.
This is my code.
It is working and creating the buttons but when i call the function twice it doesn't create two linear layouts it just shows the last one called as if it is deleting the first one.
How can i make it to create a new linear layout and add it to the View?
// Create a view
protected boolean CreateTheButtons(String[] names)
{
try
{
LinearLayout linLayout = new LinearLayout(this);
linLayout.setOrientation(LinearLayout.HORIZONTAL);
LayoutParams linLayoutParam = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
// set LinearLayout as a root element of the screen
linLayout.setWeightSum(names.length);
setContentView(linLayout, linLayoutParam);
LayoutParams lpView = new LayoutParams(0, LayoutParams.WRAP_CONTENT);
lpView.weight = 1;
for (int i = 0; i < names.length; i++) {
Button btn = new Button(this);
btn.setText(names[i]);
linLayout.addView(btn, lpView);
}
return true;
}
catch(Exception ex)
{
return false;
}
}
It is working and creating the buttons but when i call the function
twice it doesn't create two linear layouts it just shows the last one
called as if it is deleting the first one.
Your code removes the first LinearLayout resulted from calling the method because you use setContentView()(which will replace the current view of the activity(if any is found) with the view that you pass as a parameter). Instead you should remove the call to setContentView() and insert a holder ViewGroup for the LinearLayouts that you plan to add through that method.
<!-- This will be the content view of the activity -->
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="#+id/parent" />
Set the layout above as the content view for the activity, in the onCreate() method:
setContentView(R.layout.the_layout_above);
In the method you'll then have:
protected boolean CreateTheButtons(String[] names) {
try {
LinearLayout linLayout = new LinearLayout(this);
linLayout.setOrientation(LinearLayout.HORIZONTAL);
LinearLayout.LayoutParams linLayoutParam = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
linLayout.setWeightSum(names.length);
// assuming this method is in an Activity
LinearLayout parent = (LinearLayout) findViewById(R.id.parent);
parent.addView(linLayout, linLayoutParam);
LayoutParams lpView = new LayoutParams(0, LayoutParams.WRAP_CONTENT);
lpView.weight = 1;
for (int i = 0; i < names.length; i++) {
Button btn = new Button(this);
btn.setText(names[i]);
linLayout.addView(btn, lpView);
}
return true;
} catch(Exception ex) {
return false;
}
}
Related
I have created multiple button in a layout dynamically.Now,how can i remove this layout after used.
for example:-
LinearLayout parent = new LinearLayout(this);
parent.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
parent.setOrientation(LinearLayout.HORIZONTAL);
for (int i = 0; i < 10; i++) {
Button b = new Button(this);
b.setText("Primary");
Drawable image = ContextCompat.getDrawable(
getApplicationContext(),
R.drawable.your_image);
image.setBounds(0, 0, 60, 60);
b.setCompoundDrawables(null, null, image, null);
parent.addView(b);
}
If you still have the instance of the linear layout, just call removeView(...) as you did for the addView(...).
you can set visibility of linearLayout to gone by parent.setVisibility(View.GONE);
or remove all the views from the linearLayout by parent.removeAllViews().
You'll have to use removeView(View) or removeViewAt(position) from the parent, depending on if you keep track of the indexes or the objects.
parent.removeView(button);
parent.removeViewAt(buttonIndex);
get the parent of the view and remove that view from its parent
((ViewGroup) parent.getParent()).removeView(parent);
Try this:
View button = view.findViewById(R.id.buttonid);
((ViewGroup) button.getParent()).removeView(button);
I had removed ParentView from its child (Textview's) click.
tvClose.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (llContainer.getChildCount() > 1) {
((LinearLayout) view.getParent()).removeView(view);
}
}
});
I want to parse text, and create for each word - button, but i don't know how to arrange them one after the other
String s = "Alice was beginning to get very tired of sitting";
String[] q = s.split(" ");
for (int i = 0; i < q.length; i++) {
Button myButton = new Button(this);
myButton.setText(q[i]);
RelativeLayout layout = (RelativeLayout) findViewById(R.id.layout1);
layout.addView(myButton, params);
}
See this custom library: FlowLayout
While you're adding views inside FlowLayout, it automatically wraps when there is no space for the next item.
There's not much wrong about your approach, it's only that relative layout as name suggests requires child views to have some parameters to align the views relative to them e.g. above, below etc. As a result you are getting views overlapping each other and hence only the last added view is visible being on top.
Use FlowLayout instead and you'll be fine.
You need to define RelativeLayout parameters as in example below
Heres an example to get you started, fill in the rest as applicable:
TextView tv = new TextView(mContext);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.TRUE);
params.leftMargin = 107
...
mRelativeLayout.addView(tv, params);
The docs for RelativeLayout.LayoutParams and the constructors are
here
From: How to add a view programmattically to RelativeLayout?
Check the link below to get more useful informations.
Hope it will help
In the following code, you should change the upper limits of the for, to a variable.
public class MainActivity
extends Activity
implements View.OnClickListener {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TableLayout layout = new TableLayout (this);
layout.setLayoutParams( new TableLayout.LayoutParams(4,5) );
layout.setPadding(1,1,1,1);
for (int f=0; f<=13; f++) {
TableRow tr = new TableRow(this);
for (int c=0; c<=9; c++) {
Button b = new Button (this);
b.setText(""+f+c);
b.setTextSize(10.0f);
b.setTextColor(Color.rgb( 100, 200, 200));
b.setOnClickListener(this);
tr.addView(b, 30,30);
} // for
layout.addView(tr);
} // for
super.setContentView(layout);
} // ()
public void onClick(View view) {
((Button) view).setText("*");
((Button) view).setEnabled(false);
}
} // class
When creating dynamic buttons I would like them to stack one under the other vertically. I am not sure how to create this effect.
for(int i = 0; i <notificationArrayList.size(); i++)
{
if(i == 0)
{lp.addRule(RelativeLayout.BELOW, R.id.searchButton);}
else
{} //maybe tell the code here to stack under the lastID?
Notification oNote = notificationArrayList.get(i);
Button btn = new Button(this);
btn.setId(i);
final int id_ = btn.getId();
btn.setText(oNote.NotificationText);
btn.setBackgroundColor(Color.rgb(70, 80, 90));
rl.setLayoutParams(lp);
rl.addView(btn, lp);
}
Maybe in the else statement have it get the last id and add RelativeLayout that way?
The easiest way would be to put all the buttons in a LinearLayout and just add the LinearLayout beneath the search button. This produces easier code, but slightly worse drawing performance. Pseudocode would be like:
LinearLayout ll = new LinearLayout(context);
for(i=0; i<numButtons; i++) {
ll.addView(new Button(context));
}
RelativeLayout.LayoutParam lp = new RelativeLayout.LayoutParam();
lp.addRule(RelativeLayout.BELOW, R.id.searchButton);
relativeLayout.addView(ll,lp);
This example should give you an idea:
public class MyActivity extends Activity {
private RelativeLayout rel;
private EditText editText;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mine);
rel = (RelativeLayout) findViewById(R.id.main_rel);
editText = (EditText) findViewById(R.id.pref_edit_text);
Button button = new Button(this);
button.setText("Delete");
// create the layout params that will be used to define how your
// button will be displayed
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
// add the rule that places your button below your object (here a editText)
params.addRule(RelativeLayout.BELOW, editText.getId());
// set the layoutParams on the button
button.setLayoutParams(params);
// add button to your RelativeLayout
rel.addView(button);
}
}
When the user inputs a word, he creates a number of Buttons equal to the length of the word. For example: if user inputs "aaaa" he will create 4 Buttons, side by side, in the first row. Then if the user enters "bb" he will create 2 Buttons, side by side, in the second row. And "ccc" he creates 3 Buttons...
Image to demonstrate:
I dynamically create a RelativeLayout, then dynamically add Buttons to that layout. And finally I add the RelativeLayout to my existing LinearLayout. But the problem is, only one Button is added per row. And my program currently looks like this:
Can someone please me fix this problem?
CODE:
final LinearLayout linearLayout = (LinearLayout) findViewById(R.id.ll_bttn_words);
final LinearLayout.LayoutParams llp = new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
button_test.setOnClickListener(
new View.OnClickListener()
{
public void onClick(View view)
{
RelativeLayout relativeLayout = new RelativeLayout(view.getContext());
RelativeLayout.LayoutParams rlp = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
int size = enter_txt.getText().toString().length(); //the user input number of buttons
int id = 1;
for (int i=0; i<size; i++)
{
Button myButton = new Button(view.getContext());
myButton.setBackgroundResource(R.drawable.button);
myButton.setId(id);
rlp.addRule(RelativeLayout.RIGHT_OF, myButton.getId());
relativeLayout.addView(myButton, rlp);
id++;
}
linearLayout.addView(relativeLayout, llp);
rlp.addRule(RelativeLayout.RIGHT_OF, myButton.getId());
This line says that myButton should be added to right of myButton, which doesn't make any sense.
simple way to resolve this is to use the following line instead
rlp.addRule(RelativeLayout.RIGHT_OF, myButton.getId()-1);
But this isn't the best way to do this, you should use LinearLayout with horizontal orientation instead.
The structure should be simple
Just need to add your buttons in 3 different linear layout with orientation horizontal.
Like
<Relative layout>{
<LinearLayout global container with vertical orientation >{
<LinearLayout for 'a' type buttons container with horizontal orientation>
<LinearLayout for 'b' type buttons container with horizontal orientation>
<LinearLayout for 'c' type buttons container with horizontal orientation>
}
}
You guys are right. It is much easier using a LinearLayout. For those interested
final LinearLayout linearLayout = (LinearLayout) findViewById(R.id.ll_bttn_words);
final LinearLayout.LayoutParams llp = new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
button_test.setOnClickListener(
new View.OnClickListener()
{
public void onClick(View view)
{
LinearLayout linearLayout2 = new LinearLayout(view.getContext());
linearLayout2.setOrientation(LinearLayout.HORIZONTAL);
LinearLayout.LayoutParams rlp = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
int size = enter_txt.getText().toString().length();
for (int i=0; i<size; i++)
{
Button myButton = new Button(view.getContext());
myButton.setBackgroundResource(R.drawable.button);
linearLayout2.addView(myButton, rlp);
}
linearLayout.addView(linearLayout2, llp);
I have a function that loops over a list and returns the row elements.
I want to add these rows to an empty RelativeLayout one by one, so that all the rows are displayed sequentially vertically.
But the code below is not working.
void setRows(RelativeLayout rowContainer, ViewHolder viewHolder,
List<RowCollection> rowCollection) {
for (int i = 0; i < rowCollection.size(); i++) {
MyRow row = new MyRow(rowCollection.get(i));
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM, row.getId());
rowContainer.addView(row, params);
}
}
Only the last row element is displayed.
I guess but am not sure, that the rows are overlapping each other.
You are placing all your Views to the Bottom of the RelativeLayout, so they are always on top of the other. So there is always only the last one visible because the other ones are blow it.
Change your Code to this:
params.addRule(RelativeLayout.BELOW, iDFromPreviousView);
change to:
void setRows(RelativeLayout rowContainer, ViewHolder viewHolder,
List<RowCollection> rowCollection) {
MyRow lat_row=null;
for (int i = 0; i < rowCollection.size(); i++) {
MyRow row = new MyRow(rowCollection.get(i));
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
if (i == 0) {
params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
}else{
//<---get the id of previous row not sure what RowCollection contains
params.addRule(RelativeLayout.ABOVE,lat_row.getId());
}
lat_row=row;
rowContainer.addView(row, params);
}
}
this will stack all the view from bottom to top.