Typical examples of android development ---- (1) Custom button implementation, android ----

Typical examples of android development ---- (1) Custom button implementation, android ----
Typical examples of android development ---- (1) Custom button implementation
I. Activity

MainActivity. java source code:

public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}}

Ii. xml layout File

Activity_main.xml source code:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:background="@drawable/bg_button"/></LinearLayout>

Iii. Related Resources

Files under res/drawable:

Bg_button.xml source code:

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android" >    <item android:state_focused="true" android:drawable="@drawable/bg_button_pressed"></item><item android:state_pressed="true" android:drawable="@drawable/bg_button_pressed"></item><item  android:drawable="@drawable/bg_button_normal"></item></selector>

In addition to styles in state_focused and state_pressed statuses, you can also set state_checked and state_selected statuses.
Bg_button_normal.png:

Bg_button_pressed.png:

Iv. Effect

(1) buttons in the natural state:

(2) buttons in the pressing status: