I am trying to create a horizontalscrollview in the onCreate() method of my first activity, since I want to make a large number of textviews to scroll through. Here is what I have so far:
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.ViewGroup.LayoutParams;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends Activity {
LinearLayout linscrollview;
HorizontalScrollView scrollview;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
scrollview = (HorizontalScrollView) findViewById(R.id.scrollview_layout);
linscrollview = new LinearLayout(this);
for(int i=0; i<5; i++) {
TextView tv = new TextView(this);
tv.setWidth(LayoutParams.WRAP_CONTENT);
tv.setHeight(LayoutParams.WRAP_CONTENT);
tv.setText("" + i);
tv.setTextSize(20);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
params.setMargins(10, 0, 10, 0);
tv.setLayoutParams(params);
tv.setId(i);
linscrollview.addView(tv);
}
scrollview.addView(linscrollview);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
I am not getting any errors, however no textviews are showing up.
Your problem is likely to do with the setWidth and setHeight methods. They set the exact value of the TextView width and height in pixels as described in the documentation:
Makes the TextView exactly this many pixels wide. You could do the
same thing by specifying this number in the LayoutParams.
http://developer.android.com/reference/android/widget/TextView.html#setWidth(int)
What you want to do is set the LayoutParams for the TextView as you are already going slightly further down your code. So just get rid of those two method calls and it should work.
this s a chunk of code to implement horizontal scrolling for textview, modify the same according to requirements.
textView.setHorizontallyScrolling(true);
textView.setSingleLine(true);
textView.setMovementMethod(new ScrollingMovementMethod());
textView.setHorizontalScrollBarEnabled(true);
textView.setSelected(true);
Please do like this
linscrollview .setOrientation(LinearLayout.HORIZONTAL);
and ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(FILL_PARENT, WRAP_CONTENT);
My coding here. it will gives you list like horizonatal listview
String[] name={"PRASHANT","PRASHANT","PRASHANT","PRASHANT","PRASHANT","PRASHANT","PRASHANT"} ;
myLInearLayoutmain =(LinearLayout) findViewById(R.id.linearLayoutmain);
for(int i =0;i<6;i++)
{
LinearLayout li=new LinearLayout(getApplicationContext());
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
li.setOrientation(LinearLayout.VERTICAL);
LinearLayout.LayoutParams params1 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
LinearLayout.LayoutParams paramsnew = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);
params1.setMargins(30, 20, 30, 0);
//add textView
valueTV = new TextView(this);
valueTV.setText(""+name[i]);
valueTV.setId(5);
valueTV.setLayoutParams(paramsnew);
valueTV.setGravity(Gravity.CENTER);
// adding Button to linear
valueB = new Button(this);
valueB.setText(""+name[i]);
valueB.setId(i);
valueB.setLayoutParams(params);
valueB.setOnClickListener(this);
valueB.setGravity(Gravity.CENTER);
//add the textView and the Button to LinearLayout
li.addView(valueTV);
li.addView(valueB);
li.addView(img);
li.setLayoutParams(params1);
myLInearLayoutmain.addView(li);
}
Related
i've created an android application which creates 50 button dynamically,which works perfectly, but the problem is i'm getting bad view when i put some background color for these buttons dynamically using code given below
buttons[i][j].setTextColor(Color.BLACK);
buttons[i][j].setBackgroundColor(Color.GREEN);
my code is as given below, can anyone please tell me some solution for this
my Android Platform is 2.3.3
import android.app.Activity;
import android.os.Bundle;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.LinearLayout;
public class MyMain extends Activity {
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.mymain);
createCalender();
}
public void createCalender()
{
LinearLayout layoutVertical = (LinearLayout) findViewById(R.id.liVLayout);
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(
LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT, 1.0f);
LinearLayout rowLayout=null;
Button[][] buttons = new Button[10][5];
int count=51;
int tab=1;
for (int i = 0; i<10; i++)
{
if(count%5==1)
{
rowLayout = new LinearLayout(this);
rowLayout.setWeightSum(5);
layoutVertical.addView(rowLayout,param);
count=count-5;
}
for(int j=0;j<5;j++)
{
buttons[i][j]=new Button(this);
buttons[i][j].setText(""+tab);
buttons[i][j].setHeight(35);
buttons[i][j].setWidth(75);
buttons[i][j].setTextColor(Color.BLACK);
buttons[i][j].setBackgroundColor(Color.GREEN);
tab++;
rowLayout.addView(buttons[i][j],param);
}
}
}
}
You should add some margin to leave these buttons some breathing room.
// First try with WRAP_CONTENT
LinearLayout.LayoutParams paramForButtons = new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT, 1.0f);
// If the buttons look too small using WRAP_CONTENT, change to MATCH_PARENT
// Set the margins in this case
LinearLayout.LayoutParams paramForButtons = new LinearLayout.LayoutParams(
LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT, 1.0f);
paramForButtons.setMargins(10, 10, 10, 10);
Replace the last line of your for loop with:
rowLayout.addView(buttons[i][j],paramForButtons);
I have an activity that makes a layout programmatically from a Shared Preference using a for loop. The text views and buttons are enclosed in a linear layout. The user can input as many views as he wants. Now, the button will be a delete button. When pressed, I want to delete the linear layout the button and the other textviews are contained. How do I do this?
HERE IS MY CODE:
package com.dirkjan.myschools;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.graphics.Typeface;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
public class MainActivity extends Activity {
LinearLayout subjectLeft, subjectRight;
Button addSubj;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
subjectLeft = (LinearLayout) findViewById(R.id.llSubjectLeft);
subjectRight = (LinearLayout) findViewById(R.id.llSubjectRight);
//Load the saved subjects
SharedPreferences getSubjects = getSharedPreferences("SubjectInfo_Prefs", MODE_PRIVATE);
SharedPreferences.Editor editor = getSubjects.edit();
int subjectCount = getSubjects.getInt("count", 0);
if (subjectCount > 0 ){
for (int i = 1; i <= subjectCount; i++){
//Set the linear layout for each subject
LinearLayout ll = new LinearLayout(this);
ll.setOrientation(LinearLayout.VERTICAL);
LinearLayout.LayoutParams llParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
float scale = getResources().getDisplayMetrics().density;
//SET BOTTOM MARGIN
float margin = 5; //RESIZE MARGIN HERE!
int margs = (int) (margin * scale + 0.5f);
//SET PADDING IN DP
float padding = 5; //RESIZE PADDING HERE!
int pads = (int) (padding * scale +0.5f);
llParams.setMargins(0,0,0,margs);
//SETTING THE LINEARLAYOUT PARAMS
ll.setLayoutParams(llParams);
ll.setPadding(pads, pads, pads, pads);
//SETTING THE BACKGROUND COLOR OF THE LINEAR LAYOUT
String chosenColor = getSubjects.getString("chosenColor" + i, "BLUE");
if (chosenColor.equals("Green")){
ll.setBackgroundResource(R.color.HoloGreen);
}else if (chosenColor.equals("Blue")){
ll.setBackgroundResource(R.color.HoloBlue);
}else if (chosenColor.equals("Gray")){
ll.setBackgroundResource(R.color.HoloGray);
}else if (chosenColor.equals("Orange")){
ll.setBackgroundResource(R.color.HoloOrange);
}else {
ll.setBackgroundResource(R.color.HoloYellow);
}
//ADDING THE LAYOUT TO THE APPROPRIATE CONTAINER (LEFT OR RIGHT)
if (i % 2 == 1){
subjectLeft.addView(ll);
} else {
subjectRight.addView(ll);
}
//SETTING THE SUBJECT NAME TEXTVIEW
TextView SubjectName = new TextView(this);
SubjectName.setText(getSubjects.getString("subjectName" + i, "Error"));
SubjectName.setLayoutParams(new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
SubjectName.setTextSize(22);
SubjectName.setTypeface(Typeface.DEFAULT_BOLD);
//SETTING THE SUBJECT NUMB TEXT VIEW
TextView SubjectNumber = new TextView(this);
SubjectNumber.setText(getSubjects.getString("subjectNumb" + i, "Error"));
SubjectNumber.setLayoutParams(new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT));
SubjectNumber.setTextSize(16);
//Creating the divider line
ImageView divider = new ImageView(this);
LinearLayout.LayoutParams dividerParams = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, 2);
divider.setLayoutParams(dividerParams);
divider.setBackgroundResource(R.color.Black);
//Add Views into the Layout
ll.addView(SubjectNumber);
ll.addView(SubjectName);
ll.addView(divider);
}
}
addSubj = (Button) findViewById(R.id.buttonPlusSubject);
addSubj.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent toAddSubj = new Intent(MainActivity.this,
AddSubjectActivity.class);
startActivity(toAddSubj);
finish();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
Please do take note that no id is assigned for each layout. It would help if there is a code to identify the parent of the parent of the button (The button is in a relative layout, which is in a linear layout where the linear layout must be removed by clicking the button.
First find your parent layout using
ll = (LinearLayout) findViewById(R.id.main_linearlayout);
get the child layout using
final LinearLayout child = (LinearLayout) ll.findViewById(count);
now to remove the whole layout you can use removeview() method as below
ll.removeView(child);
to only remove all views from the particular layout(here for eg. child) you can use
child.removeAllViews();
You can call view.setVisiblility(View.GONE) if you want to remove it from the layout, or view.setVisibility(View.INVISIBLE) if you just want to hide it.
You can remove a Child View from a parent by calling removeView(View view), for example like this :
parent.removeView(child);
Supposing that your LinearLayout ID is my_linear_layout, just do this in your onClickListener:
findViewById(R.id.my_linear_layout).setVisibility(View.GONE);
In your XML, be sure to put the ID:
<LinearLayout
android:id="#+id/my_linear_layout"
...>
</LinearLayout>
you can do this like get the id of the currently clicked item
and assigned in root layout
LinearLayout layout = (LinearLayout) v.getParent();
And remove using this code given below:
linearLayout.removeView(layout);
I need to overlap an image view with textview. And this combined view will be repeated 100 times in a LinearLayout. I was thinking of using FrameLayout in LinearLayout and Repeating the FrameLayout in LinearLayout 100 times when FrameLayout holds the imageview and textview overlapped.
Need to do this programatically not from xml file.
I added the image and textview to framelayout first then tried to add the framelayout to linearlayout. But it says : the specified child has already a parent.. so not working. Can you please show me in code? Thanks for your help.
it is going to be like this, but need to be done programmaticaly
---linear layout--------------
------------------------------
|frame layout----------------|
||txt view on top of img view|
------------------------------
frame layout will be repeated|
---/end of linear layout------
Also here is the separated code:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
LinearLayout dynamicview = (LinearLayout) findViewById(R.id.main_layout);
FrameLayout barFrameLayout = new FrameLayout(this);
FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(
LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT,
Gravity.CENTER);
barFrameLayout.setLayoutParams(params);
LinearLayout.LayoutParams slparams1 = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
for (int i = 65; i <= 75; i++) {
TextView catTV = new TextView(this);
catTV.setLayoutParams(slparams1);
catTV.setText("===" + Character.toString((char) i) + "===");
catTV.setTextSize(32);
ImageView iv = new ImageView(this);
iv.setImageResource(R.drawable.ic_launcher);
iv.setLayoutParams(slparams1);
barFrameLayout.addView(catTV);
barFrameLayout.addView(iv);
dynamicview.addView(barFrameLayout);
}
}
Here is the code to demonstrate what you are trying to achieve. I have used RelativeLayout, which is very flexible, you can position the elements easily relative to others.( if you need to change to FrameLayout you can change ).
import android.content.Context;
import android.util.AttributeSet;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class ExampleLayout extends LinearLayout{
public ExampleLayout(Context context,AttributeSet attrs){
super(context,attrs);
for(int i =0; i< 100; i++){
RelativeLayout childLayout = new RelativeLayout(context);
ImageView img = new ImageView(context);
TextView text = new TextView(context);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
childLayout.addView(img, params);
params = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
childLayout.addView(text, params);
LinearLayout.LayoutParams parentParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
this.addView(childLayout,parentParams);
}
}
}
You can then use the ExampleLayout class to add it to any of the layout.xml file.
FrameLayout is designed to block out an area on the screen to display
a single item
(source: http://developer.android.com/reference/android/widget/FrameLayout.html).
Anyway, you have to create new FrameLayouts not use the same.
When you're doing:
barFrameLayout.addView(catTV);
barFrameLayout.addView(iv);
dynamicview.addView(barFrameLayout);
you're always adding these new objects (catTV and iv) to the same instance of a FrameLayout (barFrameLayout).
I don't think that's what you wanted to do.
I beg some leniency here, I'm just starting with the Android SDK tutorials and I'm attempting something out of interest that's not in the tutorial itself, but I would hope would be easy.
I am trying to center a TextView item via code horizontally and vertically (I can do it in XML just fine). I've seen several examples of how to do this when the parent is a table or some other object, but I hope this would be easier for me to grasp. (p.s. Feel free to correct my terminology).
Here is the example code from the tutorial / my working model:
package com.example.myfirstapp;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.ViewGroup.LayoutParams;
import android.widget.TextView;
public class DisplayMessageActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
textView.setGravity(View.TEXT_ALIGNMENT_GRAVITY);
setContentView(textView);
}
}
I've managed to locate the setGravity method, and I've tried to dabble in the setLayoutParams for it, but I'm not sure what the scope is for it as I can't locate what I should be importing to get the WRAP_CONTENT constant to resolve. From what I understood, centering and content_wrapping+gravity are two separate things. I'd like an example of how to do both in this case and maybe how/where I would have found the answer in the API documentation?
yourTextView.setGravity(Gravity.CENTER);
For dynamically center
textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.CENTER_HORIZONTAL);
this will work for sure..
RelativeLayout layout = new RelativeLayout(R.layout.your_layour);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.CENTER_IN_PARENT);
textView.setLayoutParams(params);
textView.setGravity(Gravity.CENTER);
layout.addView(textView);
setcontentView(layout);
TextView text = new TextView(this);
text.setGravity(Gravity.CENTER);
and
text.setGravity(Gravity.TOP);
and
text.setGravity(Gravity.BOTTOM);
and
text.setGravity(Gravity.LEFT);
and
text.setGravity(Gravity.RIGHT);
and
text.setGravity(Gravity.CENTER_VERTICAL);
and
text.setGravity(Gravity.CENTER_HORIZONTAL);
And More Also Avaliable
Try adding the following code for applying the layout params to the TextView
LayoutParams lp = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
lp.addRule(LinearLayout.CENTER_IN_PARENT);
textView.setLayoutParams(lp);
if your text size is small, you should make the width of your text view to be "fill_parent". After that, you can set your TextView Gravity to center :
TextView textView = new TextView(this);
textView.setText(message);
textView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
textView.setGravity(Gravity.CENTER);
You can use the following to programmatically center TextView text in Kotlin:
textview.gravity = Gravity.CENTER
try this method
public void centerTextView(LinearLayout linearLayout) {
TextView textView = new TextView(context);
textView.setText(context.getString(R.string.no_records));
textView.setTypeface(Typeface.DEFAULT_BOLD);
textView.setGravity(Gravity.CENTER);
textView.setTextSize(18.0f);
textView.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT));
linearLayout.addView(textView);
}
These two need to go together for it to work.
Been scratching my head for a while.
numberView.textAlignment = View.TEXT_ALIGNMENT_CENTER
numberView.layoutParams = ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT)
I want to show two scrollView in one LinearLayout or RelativeLayout.
Which property should is set to show first Scrollview on the top of screen and second scrollview just below the first Scrollview ?
I have tried but in linearlayout it shows me only first scrollview and in relativelayout it shows me only second scrollView.
Yes, I want to do all this dynamically without using xml file.
Here is my code
import android.app.Activity;
import android.os.Bundle;
import android.widget.*;
import android.widget.TableLayout.LayoutParams;
public class TableFinal extends Activity {
LinearLayout linearMain, linearScrollView, linearTextview;
RelativeLayout relativeMain;
ScrollView scrollview;
HorizontalScrollView Hscrollview;
TableLayout tablelayout;
TableRow tablerow;
TextView textview;
LinearLayout.LayoutParams linearparmas;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
linearparmas=new LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);
relativeMain = new RelativeLayout(this);
// First Table
linearScrollView = new LinearLayout(this);
scrollview = new ScrollView(this);
Hscrollview = new HorizontalScrollView(this);
tablelayout = new TableLayout(this);
// First Table's First Row
tablerow = new TableRow(this);
linearTextview = new LinearLayout(this);
textview = new TextView(this);
textview.setText("11");
linearTextview.addView(textview);
tablerow.addView(linearTextview);
linearTextview = new LinearLayout(this);
textview = new TextView(this);
textview.setText("12");
linearTextview.addView(textview);
tablerow.addView(linearTextview);
tablelayout.addView(tablerow);
Hscrollview.addView(tablelayout);
scrollview.addView(Hscrollview);
linearScrollView.addView(scrollview);
relativeMain.addView(linearScrollView);
// first table complete
// second tabler start
linearScrollView = new LinearLayout(this);
scrollview = new ScrollView(this);
Hscrollview = new HorizontalScrollView(this);
tablelayout = new TableLayout(this);
// second Table's First Row
tablerow = new TableRow(this);
linearTextview = new LinearLayout(this);
textview = new TextView(this);
textview.setText("21");
linearTextview.addView(textview);
tablerow.addView(linearTextview);
linearTextview = new LinearLayout(this);
textview = new TextView(this);
textview.setText("22");
linearTextview.addView(textview);
tablerow.addView(linearTextview);
tablelayout.addView(tablerow);
Hscrollview.addView(tablelayout);
scrollview.addView(Hscrollview);
linearScrollView.addView(scrollview);
relativeMain.addView(linearScrollView);
// second tabler complete
setContentView(relativeMain);
}
}
Thank you.
You can use LinearLayout or RelativeLayout.
For all layouts you need to get displayHeight.
Display display = ((WindowManager) getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
int displayHeight = display.getHeight();
Then for all layouts set layoutParams to fill parent.
Now for scrollViews differences begin.
In LinearLayout for both scrollViews set the same layoutParams (LinearLayout.layoutParams)
scrollView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, displayHeight/2));
And add both to linearLayout
In RelativeLayout set layoutParams like in my example (RelativeLayout.layoutParams)
RelativeLayout.LayoutParams lp1 = new LayoutParams(LayoutParams.FILL_PARENT, displayHeight);
lp1.addRule(ALIGN_PARENT_TOP);
scrollView1.setLayoutParams(lp1);
RelativeLayout.LayoutParams lp2 = new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
lp2.addRule(BELOW, scrollView1.getId());
scrollView2.setLayoutParams(lp2);
And add both to layout.
Should work in all display resolution if I did not messed up.