Develop Reference

Read More button in android

I have looked through few read more button questions but I didnot get a kind of solution that I was looking more. I want to display only certain part of layout and only when user presses the Read more button would display the rest of the layout with drop down animation. Something of this sort:

I cant give you the exact code u desires, but i can help u by giving a sample code that meets your requirement,
Here I am only describe that how more/less button functionality are work.
first of all in your activity_main.xml file paste below code.
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/description_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:maxLines="5"
android:text="#string/desc_content" />
<ImageButton
android:id="#+id/show"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="#+id/description_text"
android:background="#drawable/arrow_down"
android:clickable="true" />
<View
android:id="#+id/view1"
android:layout_width="wrap_content"
android:layout_height="2dp"
android:layout_below="#+id/description_text"
android:layout_marginTop="5dp"
android:layout_toLeftOf="#+id/show"
android:background="#000" />
<ImageButton
android:id="#+id/hide"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="#+id/description_text"
android:background="#drawable/arrow_up"
android:clickable="true"
android:visibility="invisible" />
</RelativeLayout>
</ScrollView>
MainActivity.java
package com.example.expand.textview;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView descText;
ImageButton show, hide;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
descText = (TextView) findViewById(R.id.description_text);
show = (ImageButton) findViewById(R.id.show);
show.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
System.out.println("Show button");
show.setVisibility(View.INVISIBLE);
hide.setVisibility(View.VISIBLE);
descText.setMaxLines(Integer.MAX_VALUE);
}
});
hide = (ImageButton) findViewById(R.id.hide);
hide.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
System.out.println("Hide button");
hide.setVisibility(View.INVISIBLE);
show.setVisibility(View.VISIBLE);
descText.setMaxLines(5);
}
});
}
}
and finally change your string.xml file
string.xml
<resources>
<string name="app_name">Expand TextView</string>
<string name="hello_world">Hello world!</string>
<string name="menu_settings">Settings</string>
<string name="title_activity_main">MainActivity</string>
<string name="desc_content"> Android powers hundreds of millions of mobile devices in more than 190 countries around the world. It\'s the largest installed base of any mobile platform and growing fast—every day another million users power up their Android devices for the first time and start looking for apps, games, and other digital content.
Android gives you a world-class platform for creating apps and games for Android users everywhere, as well as an open marketplace for distributing to them instantly.
</string>
</resources>
and run your Project It will give you below output.

ListView using array adapter and customizing xml file

I am trying to show a simple listView with an image, a large text and a small text in each list item. I have coded the following but when I run the app, it gives a NullPointerException. For the method i have used, I do not need to findviewbyid so I'm not sure what I am doing to give this error. Anyone know?
This is my MenuPage.java file
import android.app.Activity;
import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
public class MenuPage extends ListActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String[]values=new String[]{"Coffee","Steak","Ice Cream"};
String[]prices=new String[]{"$4.99","$21.99","$12.99"};
setListAdapter(new ArrayAdapter<String>(this,R.layout.activity_main,R.id.values, values));
setListAdapter(new ArrayAdapter<String>(this,R.layout.activity_main,R.id.prices, prices));
}
}
this is my menu.xml for the java file above:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<ImageView
android:id="#+id/ic_launcher_movies"
android:layout_width="50px"
android:layout_height="50px"
android:layout_marginLeft="4dp"
android:layout_marginRight="10px"
android:layout_marginTop="2dp"
android:src="#drawable/items"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true">
</ImageView>
<TextView
android:id="#+id/values"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#+id/values"
android:textSize="25sp"
android:layout_alignParentLeft="true"
android:layout_marginLeft="64dp"
android:layout_alignParentTop="true"
android:layout_marginTop="0dp"
android:minHeight="120dp">
</TextView>
<TextView
android:id="#+id/prices"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#+id/prices"
android:textSize="10sp"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginTop="120dp"
android:layout_marginLeft="65dp">
</TextView>
also, I created an xml with the drawables for the images i want to use;
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:duration="30"
android:drawable="#drawable/coffee"/>
<item
android:duration="30"
android:drawable="#drawable/steak"/>
<item
android:duration="30"
android:drawable="#drawable/icecream"/>
and my logcat gives this error
any help would be appreciated! thank you

I think the problem in the menu layout file
android:text="#+id/values"
try to write some text or specify link to string resource like
android:text="#string/my_button_text"
And when you call setListAdpate two times you ovirwrite first adapter with new. Have a look to example here
ListActivity

The spinner menu shows very long text, but not the triangle image

When I make the spinner with very long text, the spinner button (not drop down menu), which usually shows the selected text and the triangle image(▼), doesn't show the triangle image.
I tested with normal (android.R.layout.simple_spinner_item) layout and multiline layout.
But neither did.
The right side of spinner button is the outside of the window.
(Sorry, I can't attach the image because I'm a new user.)
The sources are following;
SpinnerTestActivity.java
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
public class SpinnerTestActivity extends Activity {
String[] mStrings = {"verrrrrrrrrry looooooooooooooong",
"abc loooooooooooooooooooooooooong",
"xyz"
};
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Spinner spinner = (Spinner)findViewById(R.id.spinner1);
// ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, mStrings);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,R.layout.multiline_spinner_item, mStrings);
spinner.setAdapter(adapter);
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/TableLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:stretchColumns="1" >
<TableRow
android:id="#+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
<Spinner
android:id="#+id/spinner1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</TableRow>
</TableLayout>
multiline_spinner_item.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#android:id/text1"
style="?android:attr/spinnerItemStyle"
android:singleLine="false"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:ellipsize="marquee" />

Thank you for your observations on my question.
I found the answer.
add
spinner.getLayoutParams().width = spinner.getWidth();
after
spinner.setAdapter(adapter);

Have you defined the android:prompt attribute in your Android Spinner controller?
It will help you. Please see the following code:
<Spinner
android:id="#+id/spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:prompt="#string/planet_prompt"
/>
You can refer to the following link: Can an Android AsyncTask doInBackground be synchronized to serialize the task execution?

Android XML Layout Problems

I was trying to create a row layout where each of my list item will have a template to follow. Currently I have this, which allows me to display a single line text in each list.
<?xml version="1.0" encoding="utf-8"?>
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:textSize="20sp"
android:padding="100dp" >
</TextView>
However, when I try to change it to allow me to add more items such as image buttons and more text field, it always doesn't allow me to compile.
I tried taking a piece of xml from a tutorial on developer.android's website,
<?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="wrap_content"
android:orientation="vertical">
<TextView android:id="#+id/text1"
android:textSize="16sp"
android:textStyle="bold"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<TextView android:id="#+id/text2"
android:textSize="16sp"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
But it throws me an error stating - The processing instruction target matching "[xX][mM][lL]" is not
allowed.
- error: Error parsing XML: XML or text declaration not at start of entity
Can someone help me with this? I am not too sure what this error means.
UPDATE:
what i am trying to do is to have a fragment like a side bar on the right which shows a list of items, with the first xml that i posted, i'm able to get the results i want, but i couldn't make any changes to it.
package com.project.test;
import android.app.ListFragment;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class TestListFragment extends ListFragment {
String [] Items = {"Item A", "Item B", "Item C"};
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setListAdapter(new ArrayAdapter<String>(getActivity(),
R.layout.listtemplate, Items));
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
Log.i("FragmentList", "Item clicked: " + id);
}
}

You would not believe the solution to this... I had the same issue and the answer was "remove all the white spaces before start the xml first line"

Might be because you are missing the starting tag of the LinearLayout?
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView android:id="#+id/text1"
android:textSize="16sp"
android:textStyle="bold"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<TextView android:id="#+id/text2"
android:textSize="16sp"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>

Android dynamically change checkbox problem

I'm trying to change my checkbox dynamically.
for some reason the app throw my an exception.
what am I doing wrong?
this is my java code:
package com.school.commtest;
import android.app.Activity;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.TableLayout;
import android.widget.TableRow;
public class OtherPlacesMenu extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
CheckBox c1 = (CheckBox)this.findViewById(R.id.schools);
c1.setChecked(true);
setContentView(R.layout.otherplacesmenu);
}
}
and this is the xml:
<?xml version="1.0" encoding="utf-8"?>
<TableLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/table">
<TableRow android:layout_height="fill_parent" android:layout_width="wrap_content" android:id="#+id/tableRow1">
<CheckBox android:text="School" android:id="#+id/schools" android:layout_width="wrap_content" android:layout_height="wrap_content"></CheckBox>
</TableRow>
<TableRow android:layout_height="fill_parent" android:layout_width="wrap_content" android:id="#+id/tableRow2">
<CheckBox android:text="Supermaker" android:layout_height="wrap_content" android:id="#+id/supermarkets" android:layout_width="wrap_content"></CheckBox>
</TableRow>
<TableRow android:layout_height="fill_parent" android:layout_width="wrap_content" android:id="#+id/tableRow3">
<CheckBox android:text="Gardens" android:layout_height="wrap_content" android:id="#+id/gardens" android:layout_width="wrap_content"></CheckBox>
</TableRow>
</TableLayout>
I'm sure its a simple question, but I cannot find the answer anywhere.
p.s.
I can't set the value of the checkbox to be true at the xml because I would later want to change the checkbox from the user setting.
10x!

Usually you should post the exception message when asking a question like this, but it looks like your problem is that you're trying to findViewById before you setContentView. Your view doesn't exist to be found when you look for it.