Question

i have a listview which has an adapter, which worked properly, but then i added some code because i wanted the rows to be different colors, after that, the onclick color doesnt show up.

Here is the code i added:

if (position % 2 == 0)
            vi.findViewById(R.id.parentL).setBackgroundColor(ctx.getResources().getColor(R.color.row1));
        else
            vi.findViewById(R.id.parentL).setBackgroundColor(ctx.getResources().getColor(R.color.row2));

Answer 1

TL:DR

• Use selectors for listview items
• You need to set your overall listview background to be to transparent.

Instructions

First, you need to set your ListView to to be transparent

Inside your Adapter’s onCreate() method, set:

 ((ListView) findViewById(R.id.main_list)).setBackgroundColor(0);

Next, inside Adapter‘s getView() include the following code

if (position%2 == 0) {
    view.setBackgroundResource(R.drawable.selector);
} else {
    view.setBackgroundResource(R.drawable.selector2);
}

where selector.xml is

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:state_pressed="false" android:state_focused="false"
        android:drawable="@color/blue" />
    <item android:state_enabled="false" android:state_focused="true"
        android:drawable="@color/translucent_red" />
    <item android:state_enabled="true" 
     android:state_pressed="true" android:drawable="@color/translucent_red" />
    <item android:state_enabled="true"
     android:state_focused="true" android:drawable="@color/translucent_red" />
    <item
     android:drawable="@color/android:transparent" />
</selector>

and selector2.xml is

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:state_pressed="false" android:state_focused="false"
        android:drawable="@color/green" />
    <item android:state_enabled="false" android:state_focused="true"
        android:drawable="@color/opaque_red" />
    <item android:state_enabled="true" 
     android:state_pressed="true" android:drawable="@color/opaque_red" />
    <item android:state_enabled="true"
     android:state_focused="true" android:drawable="@color/opaque_red" />
    <item
     android:drawable="@color/android:transparent" />
</selector>

don’t forget to include a colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
   <color name="opaque_red">#f00</color>
   <color name="translucent_red">#80ff0000</color>
   <color name="blue">#00f</color>
   <color name="green">#0f0</color>
</resources>

Sample Project

here are the files for a sample project I configured for you. You probably want to do a Project > Clean before anything else.

Some files can be ignored in this app, since I modified an existing sample that did something very different.

Screenshot

here is what my example app looked like