I have written a ListView with a text and image clubbed together in a row.
I wanted to add a button on top of listview, then the entire content of listview should be seen. Button is named as "More", when someone clicks it i will be updating the listcontent. That is the main theme.
Can anyone suggest how to do it?
My java file.
package com.example.firstandroid;
import org.json.JSONArray;
import org.json.JSONObject;
import android.app.ListActivity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
public class Screen2 extends ListActivity {
String result="";
private static String DATA[];
/**
* Demonstrates how to write an efficient list adapter. The adapter used in this example binds
* to an ImageView and to a TextView for each row in the list.
*
* To work efficiently the adapter implemented here uses two techniques:
* - It reuses the convertView passed to getView() to avoid inflating View when it is not necessary
* - It uses the ViewHolder pattern to avoid calling findViewById() when it is not necessary
*
* The ViewHolder pattern consists in storing a data structure in the tag of the view returned by
* getView(). This data structures contains references to the views we want to bind data to, thus
* avoiding calls to findViewById() every time getView() is invoked.
*/
private static class EfficientAdapter extends BaseAdapter {
private LayoutInflater mInflater;
private Bitmap mIcon1;
private Bitmap mIcon2;
public EfficientAdapter(Context context) {
// Cache the LayoutInflate to avoid asking for a new one each time.
mInflater = LayoutInflater.from(context);
// Icons bound to the rows.
mIcon1 = BitmapFactory.decodeResource(context.getResources(), R.drawable.next_arrow);
mIcon2 = BitmapFactory.decodeResource(context.getResources(), R.drawable.next_arrow);
}
/**
* The number of items in the list is determined by the number of speeches
* in our array.
*
* @see android.widget.ListAdapter#getCount()
*/
public int getCount() {
return DATA.length+1;
}
/**
* Since the data comes from an array, just returning the index is
* sufficent to get at the data. If we were using a more complex data
* structure, we would return whatever object represents one row in the
* list.
*
* @see android.widget.ListAdapter#getItem(int)
*/
public Object getItem(int position) {
return position;
}
/**
* Use the array index as a unique id.
*
* @see android.widget.ListAdapter#getItemId(int)
*/
public long getItemId(int position) {
return position;
}
/**
* Make a view to hold each row.
*
* @see android.widget.ListAdapter#getView(int, android.view.View,
* android.view.ViewGroup)
*/
public View getView(int position, View convertView, ViewGroup parent) {
// A ViewHolder keeps references to children views to avoid unneccessary calls
// to findViewById() on each row.
ViewHolder holder;
// When convertView is not null, we can reuse it directly, there is no need
// to reinflate it. We only inflate a new View when the convertView supplied
// by ListView is null.
if(position ==0)
{
convertView = mInflater.inflate(R.layout.main2, null);
}
else
{
if (convertView == null) {
convertView = mInflater.inflate(R.layout.main1, null);
// Creates a ViewHolder and store references to the two children views
// we want to bind data to.
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.text);
holder.icon = (ImageView) convertView.findViewById(R.id.icon);
convertView.setTag(holder);
} else {
// Get the ViewHolder back to get fast access to the TextView
// and the ImageView.
holder = (ViewHolder) convertView.getTag();
}
// Bind the data efficiently with the holder.
holder.text.setText(DATA[position]);
holder.icon.setImageBitmap((position & 1) == 1 ? mIcon1 : mIcon2);
}
return convertView;
}
static class ViewHolder {
TextView text;
ImageView icon;
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent myIntent = new Intent(this , firstandroid.class);
//startActivityForResult(myIntent, 0);
Bundle bun = getIntent().getExtras();
result = bun.getString("mani");
try
{
JSONObject json=new JSONObject(result);
JSONArray ja;
json = json.getJSONObject("responseData");
ja = json.getJSONArray("results");
int resultCount = ja.length();
DATA = new String[resultCount];
for (int i = 0; i < resultCount; i++)
{
JSONObject resultObject = ja.getJSONObject(i);
DATA[i]=resultObject.get("titleNoFormatting").toString();
DATA[i]+="\n";
JSONArray addr;
addr = resultObject.getJSONArray("addressLines");
int count = addr.length();
for(int j=0;j<count;j++)
{
// JSONObject resultObject1 = ja.getJSONObject(j);
DATA[i]+=addr.getString(j);
}
}
}
catch(Exception e)
{
}
setListAdapter(new EfficientAdapter(this));
}
}
My xml file. /res/layout
<?xml version="1.0" encoding="utf-8" ?>
LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
TextView android:id="@+id/text"
android:layout_gravity="center_vertical"
android:layout_width="0dip"
android:layout_weight="1.0"
android:layout_height="wrap_content" />
ImageView android:id="@+id/icon"
android:layout_width="30dip"
android:layout_height="30dip" />
</LinearLayout>