Android UI设计系列之自定义SwitchButton开关实现类似IOS中UISwitch的动画效果（2）

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 
 xmlns:android="http://schemas.android.com/apk/res/android" 
 android:id="@+id/switch_parent" 
 android:layout_width="wrap_content" 
 android:layout_height="wrap_content" 
 android:background="@drawable/switch_bg"> 
 
 <ImageView 
 android:id="@+id/switch_button" 
 android:layout_width="wrap_content" 
 android:layout_height="wrap_content" 
 android:src="@drawable/switch_btn" /> 
 
</LinearLayout> 

public class SwitchButton extends LinearLayout { 
 
 /** 
 * 开关图片 
 */ 
 private LinearLayout switchParent; 
 /** 
 * 滑块图片 
 */ 
 private ImageView switchButton; 
 /** 
 * 按钮状态，默认关闭 
 */ 
 private boolean isOn = false; 
 /** 
 * 滑块需要滑动的距离 
 */ 
 private int scrollDistance; 
 /** 
 * 开关按钮监听器 
 */ 
 private SwitchChangedListner listner; 
 
 public SwitchButton(Context context) { 
 super(context); 
 initWedgits(context); 
 } 
 
 public SwitchButton(Context context, AttributeSet attrs) { 
 super(context, attrs); 
 initWedgits(context); 
 } 
 
 /** 
 * 初始化组件 
 * 
 * @param context 
 *  上下文环境 
 */ 
 private void initWedgits(Context context) { 
 try { 
  View view = LayoutInflater.from(context).inflate( 
   R.layout.switch_button, this); 
  switchParent = (LinearLayout) view.findViewById(R.id.switch_parent); 
  switchButton = (ImageView) view.findViewById(R.id.switch_button); 
  addListeners(); 
 } catch (Exception e) { 
  e.printStackTrace(); 
 } 
 } 
 
 /** 
 * 添加事件监听器 
 */ 
 private void addListeners() { 
 try { 
  switchParent.setOnClickListener(new OnClickListener() { 
  @Override 
  public void onClick(View v) { 
   isOn = !isOn; 
   scrollSwitch(); 
   if (null != listner) { 
   // 开关开发或者关闭的回调方法 
   listner.switchChanged(getId(), isOn); 
   } 
  } 
  }); 
 } catch (Exception e) { 
  e.printStackTrace(); 
 } 
 } 
 
 /** 
 * 滑动开关 
 */ 
 private void scrollSwitch() { 
 // 获取滑块需要滑动的距离，滑动距离等于父组建的宽度减去滑块的宽度 
 scrollDistance = switchParent.getWidth() - switchButton.getWidth(); 
 // 初始化滑动事件 
 Animation animation = null; 
 if (isOn) { 
  animation = new TranslateAnimation(0, scrollDistance, 0, 0); 
 } else { 
  animation = new TranslateAnimation(scrollDistance, 0, 0, 0); 
 } 
 // 设置滑动时间 
 animation.setDuration(200); 
 // 滑动之后保持状态 
 animation.setFillAfter(true); 
 // 开始滑动 
 switchButton.startAnimation(animation); 
 } 
 
 /** 
 * 获取开关状态 
 * 
 * @return 【true:打开】【false:关闭】 
 */ 
 public boolean isOn() { 
 return isOn; 
 } 
 
 /** 
 * 设置开关状态 
 * 
 * @param isOn 
 *  开关状态【true:打开】【false:关闭】 
 */ 
 public void setOn(boolean isOn) { 
 if (this.isOn == isOn) { 
  return; 
 } 
 this.isOn = isOn; 
 post(new Runnable() { 
  @Override 
  public void run() { 
  scrollSwitch(); 
  } 
 }); 
 } 
 
 /** 
 * 设置开关状态监听器 
 * 
 * @param listner 
 *  开关状态监听器 
 */ 
 public void setOnSwitchListner(SwitchChangedListner listner) { 
 this.listner = listner; 
 } 
 
 /** 
 * 开关状态监听器 
 * 
 * @author llew 
 * 
 */ 
 public interface SwitchChangedListner { 
 /** 
  * 开关状态改变 
  * 
  * @param viewId 
  *  当前开关ID 
  * @param isOn 
  *  开关是否打开【true:打开】【false:关闭】 
  */ 
 public void switchChanged(Integer viewId, boolean isOn); 
 } 
} 

public class MainActivity extends Activity { 
 
 private SwitchButton switchButton; 
 
 /** Called when the activity is first created. */ 
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.main); 
 initWedgits(); 
 } 
 
 /** 
 * 初始化各组件 
 */ 
 private void initWedgits() { 
 try { 
  switchButton = (SwitchButton) findViewById(R.id.switchButton); 
  // switchButton.setOn(false); 
  switchButton.setOn(true); 
  addListeners(); 
 } catch (Exception e) { 
  e.printStackTrace(); 
 } 
 } 
 
 /** 
 * 添加事件监听器 
 */ 
 private void addListeners() { 
 try { 
  switchButton.setOnSwitchListner(new SwitchChangedListner() { 
  @Override 
  public void switchChanged(Integer viewId, boolean isOn) { 
   if(isOn) { 
   Toast.makeText(getApplicationContext(), "开关打开了", Toast.LENGTH_LONG).show(); 
   } else { 
   Toast.makeText(getApplicationContext(), "开关关闭了", Toast.LENGTH_LONG).show(); 
   } 
  } 
  }); 
 } catch (Exception e) { 
  e.printStackTrace(); 
 } 
 } 
}