Apps Highlight the selected item background after click the backbutton

[krishnaveni]

I have to develop one android application.

Here is the scenario:There are many images in a linearlayout. When selected, the layout should be displayed with another(gradient_bg_hover.xml) background. This works well now.

Now, I would like that when I open a new activity and come back to this one, the last selected layout should still be the highlighted one (with the (gradient_bg_hover.xml) background).

How can this be done ???

Now i have used below code for highlighting the image when pressed:

[HIGH]
LinearLayout ar = new LinearLayout(this);
ar.setOrientation(LinearLayout.VERTICAL);
ar.setPadding(3, 3, 3, 3);
ar.setLayoutParams(artiLayoutParams);
ar.setGravity(Gravity.CENTER);
ar.setBackgroundColor(Color.parseColor("#666666"));
ar.setBackgroundDrawable(getResources().getDrawable(R.drawable.list_selector));
ar.setId(position);
position++;
ar.setOnClickListener(mArticleClick);

LinearLayout ly = new LinearLayout(this);
ly.setOrientation(LinearLayout.VERTICAL);
ly.setBackgroundColor(Color.parseColor("#666666"));
ly.setLayoutParams(articleLayoutParams);
ly.setPadding(1, 1, 1, 1);


ImageView im = new ImageView(this);
im.setPadding(2, 0, 2, 0);
im.setLayoutParams(imageLayoutParams);
imageViewsHashMap.put(Appscontent.Sub_arraylistimagesub.get(j));
im.setBackgroundColor(Color.parseColor("#302c2d"));

[/HIGH]


list_selector.xml:

[HIGH]
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Selector style for listrow -->
<item

android:state_pressed="false"
android:drawable="@drawable/gradient_bg" />
<item android:state_pressed="true"
android:drawable="@drawable/gradient_bg_hover" />

</selector>

[/HIGH]

In OnClick function i have wrote the below code:

[HIGH]
private OnClickListener mArticleClick = new OnClickListener()
{

@Override
public void onClick ( View v )
{
int object = v.getId();
v.setSelected(true);

String articletitle = Appscontent.Sub_arraylist.get(object).toString();
Intent in = new Intent(MainActivity.this, SubCate.class);
in.putExtra("Title", articletitle);
startActivity(in);
}
};

[/HIGH]

Here i have to clicked one item means it is go to next activity.afterthat i have clicked back button means the selected item is stay on highlighted with another background.afterthat i have selected another item means its go to next activity.now i have to click back button means these item only highlight with background....but the pervious item also highlighted....

I wish to need the o/p like :

The last selected item only highlighted after click the back button...please help me...how can i do ..

So i have used sharedpreferences :

I have declared int prevPosition = -1; globally...

[HIGH]
ar = new LinearLayout(this);
ar.setOrientation(LinearLayout.VERTICAL);
ar.setPadding(3, 3, 3, 3);
ar.setLayoutParams(artiLayoutParams);
ar.setGravity(Gravity.CENTER);
ar.setBackgroundColor(Color.parseColor("#666666"));
ar.setBackgroundDrawable(getResources().getDrawable(R.drawable.list_selector));
ar.setId(position);
position++;
ar.setOnClickListener(mArticleClick);
SharedPreferences preferences = getSharedPreferences(SPF_NAME, android.content.Context.MODE_PRIVATE);
SharedPreferences.Editor editor = preferences.edit();
editor.putLong("POSITION", prevPosition);
editor.commit();

[/HIGH]

In Onclick method:

[HIGH]
private OnClickListener mArticleClick = new OnClickListener()
{

@Override
public void onClick ( View v )
{

int object = v.getId();

SharedPreferences preferences = getSharedPreferences(SPF_NAME, android.content.Context.MODE_PRIVATE);
SharedPreferences.Editor editor = preferences.edit();
editor.putLong("POSITION", -1);
editor.commit();

[/HIGH]

But my background color is not staying after press the back button...

pls give me any ideas...

 

[out of ideas]

are you using "Bundle" and "saveInstanceState" somewhere in there?