dynamic | Tech Tips & Tricks

How To Dynamically Add Items To Ext.carousel.Carousel In Sencha Touch

September 14, 2012 by blogmeister·0 Comments

Suppose your code for adding items to a Ext.carousel.Carousel in Sencha Touch looks like this

Ext.create('Ext.Carousel', {
    fullscreen: true,
    items: [
        {
            html : 'Item 1',
        },
        {
            html : 'Item 2',
        },
        {
            html : 'Item 3'
        }
    ]
});

Ext.create('Ext.Carousel', {

fullscreen: true,

items: [

{

html : 'Item 1',

{

html : 'Item 2',

{

html : 'Item 3'

}

]

});

To add these same data dynamically, place the code within its initialize function and do your looping there. Check out this sample code.

Ext.create('Ext.Carousel', {
    fullscreen: true,
    initialize: function() {
        for (i=1; i<=3; i++) {
            this.add({ html : 'Item ' + i });
        }
    }
});

Ext.create('Ext.Carousel', {

fullscreen: true,

initialize: function() {

for (i=1; i<=3; i++) {

this.add({ html : 'Item ' + i });

}

});

How To Get Resource Id Dynamically In Android

July 11, 2012 by blogmeister·0 Comments

In Android, we normally use the R class in order to gain access to the drawable, layout, string (and others) variables.

I made this helper method to get a resource id dynamically. However, if you have no need for this, it is a better option to use the R class directly as the search operation is quicker compared to this.

public static int getResId(String variableName, Context context, Class<?> c) {
    try {
        Field idField = c.getDeclaredField(variableName);
        return idField.getInt(idField);
    } catch (Exception e) {
        e.printStackTrace();
        return -1;
    } 
}

public static int getResId(String variableName, Context context, Class<?> c) {

try {

Field idField = c.getDeclaredField(variableName);

return idField.getInt(idField);

} catch (Exception e) {

e.printStackTrace();

return -1;

}

Let us say, you have an XML file named help.xml in your res/layout/ folder. To use the method, do it like this.

getRestId("help", this, R.layout.class);

1	getRestId("help", this, R.layout.class);

Android: How to load layout xml files dynamically during runtime

March 19, 2008 by blogmeister·4 Comments

Here is a sample code to load XML layout files at runtime within your Android application. Basically, you have to have a Layout tag within your main XML file so that we get to have a placeholder to where we want to store our content.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/content1"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:background="#ff99ccff"
/>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/content1"

android:orientation="vertical"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:background="#ff99ccff"

Then in your code, follow this:

LinearLayout ll = (LinearLayout) a.findViewById(R.id.content2);
ViewInflate vi = (ViewInflate) a.getSystemService(Context.INFLATE_SERVICE); 
View vv = vi.inflate(R.layout.mynewxmllayout, null, null); 
ll.addView(vv, new LinearLayout.LayoutParams(ll.getLayoutParams().width, ll.getLayoutParams().height));

LinearLayout ll = (LinearLayout) a.findViewById(R.id.content2);

ViewInflate vi = (ViewInflate) a.getSystemService(Context.INFLATE_SERVICE);

View vv = vi.inflate(R.layout.mynewxmllayout, null, null);

ll.addView(vv, new LinearLayout.LayoutParams(ll.getLayoutParams().width, ll.getLayoutParams().height));

where a is the class that extends Activity. If you are going to place this code within your class that extends Activity, you don’t need to include the a. in the code. Of course, this does not restrict to LinearLayout alone. You can use all other layouts to add new Views as its content.

Tech Tips & Tricks

tech tips gadgets programming software

Tag: dynamic

How To Dynamically Add Items To Ext.carousel.Carousel In Sencha Touch

How To Get Resource Id Dynamically In Android

Android: How to load layout xml files dynamically during runtime