seletor android

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本例使用selector实现点击切换图片效果

public class MainActivity extends Activity {private Button bt;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);bt = (Button) findViewById(R.id.bt);}}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/container"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.example.expandablelist_test.MainActivity"     android:orientation="vertical">    <Button         android:id="@+id/bt"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:background="@drawable/imgselector"       /></LinearLayout>

selector中

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

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