How does the background color change when a button is pressed in android api 4.1 in android?

Question

I want to know that on the button click how the background color has changed here, and this takes place more than the size of the button. Can someone tell e where the background color comes from? inside android api 4.1, along the way: The Android-res-layout-log_text_box_1.xml API file looks like this.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:id="@+id/add" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/log_text_box_1_add_text"/> <com.example.android.apis.text.LogTextBox android:id="@+id/text" android:background="@drawable/box" android:layout_width="match_parent" android:layout_height="0dip" android:layout_weight="1" android:scrollbars="vertical"/> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/log_text_box_1_do_nothing_text"/> </LinearLayout> 

Answer 1

This behavior is the default style button for the Holo theme, using the selector for such buttons is located in the Path folder of your sdk \ platform \ android-16 \ data \ res \ drawable with names such as: btn_default_holo_dark.xml and btn_default_holo_light.xml

used for the first selector are:

 btn_default_normal_holo_dark.9 

 btn_default_disabled_holo_dark.9 

 btn_default_disabled_focused_holo_dark.9 

 btn_default_focused_holo_dark.9 

 btn_default_pressed_holo_dark.9 

The last 9-patch image is the one that is responsible for the effect of exceeding the borders of the buttons, I hope that what you are looking for.