相信大家经常在应用中会看到卫星菜单，那么这篇文章就来介绍在Android中如何实现自定义的卫星式菜单(弧形菜单)，有需要的可以参考学习。
一、前言
Android 实现卫星式菜单也叫弧形菜单，主要要做的工作如下：
1.动画的处理
2.自定义ViewGroup来实现卫星式菜单View
（1）自定义属性
a. 在attrs.xml中定义属性
b. 在布局中使用自定义属性
c. 在自定义View中读取布局文件中的自定义属性
（2）onMeasure 测量 child 即测量主按钮以及菜单项
（3）onLayout 布局 child 即布局主按钮以及菜单项
（4）设置主按钮的选择动画
a.为菜单项menuItem添加平移动画和旋转动画
b.实现菜单项menuItem的点击动画
卫星式菜单效果截图：
二、实现
上面介绍了原理和效果图，下面来看看卫星菜单类的实现：
1.布局文件的实现
2.卫星菜单类的实现
package com.xc.xcskin.view; import com.xc.xcskin.R; import android.content.Context; import android.content.res.TypedArray; import android.util.AttributeSet; import android.util.Log; import android.util.TypedValue; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.view.animation.AlphaAnimation; import android.view.animation.Animation; import android.view.animation.Animation.AnimationListener; import android.view.animation.AnimationSet; import android.view.animation.RotateAnimation; import android.view.animation.ScaleAnimation; import android.view.animation.TranslateAnimation; /** * 卫星式菜单View * @author caizhiming * */ public class XCArcMenuView extends ViewGroup implements OnClickListener{ private static final int POS_LEFT_TOP = 0; private static final int POS_LEFT_BOTTOM = 1; private static final int POS_RIGHT_TOP = 2; private static final int POS_RIGHT_BOTTOM = 3; private Position mPosition = Position.RIGHT_BOTTOM; private int mRadius; private Status mStatus = Status.CLOSE; //主菜的单按钮 private View mCButton; private OnMenuItemClickListener mOnMenuItemClickListener; /** * 菜单的状态枚举类 * @author caizhiming * */ public enum Status{ OPEN,CLOSE } /** * 菜单的位置枚举类 * @author caizhiming * */ public enum Position{ LEFT_TOP,LEFT_BOTTOM, RIGHT_TOP,RIGHT_BOTTOM } /** * 点击子菜单项的回调接口 * @author caizhiming * */ public interface OnMenuItemClickListener { void onClick(View view, int pos); } public void setOnMenuItemClickListener( OnMenuItemClickListener onMenuItemClickListener) { this.mOnMenuItemClickListener = onMenuItemClickListener; } public XCArcMenuView(Context context) { this(context, null); // TODO Auto-generated constructor stub } public XCArcMenuView(Context context, AttributeSet attrs) { this(context, attrs, 0); // TODO Auto-generated constructor stub } public XCArcMenuView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub //获取自定义属性 TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.XCArcMenuView,defStyle,0); int pos = a.getInt(R.styleable.XCArcMenuView_position , POS_RIGHT_BOTTOM); switch (pos) { case POS_LEFT_TOP: mPosition = Position.LEFT_TOP; break; case POS_LEFT_BOTTOM: mPosition = Position.LEFT_BOTTOM; break; case POS_RIGHT_TOP: mPosition = Position.RIGHT_TOP; break; case POS_RIGHT_BOTTOM: mPosition = Position.RIGHT_BOTTOM; break; } mRadius = (int) a.getDimension(R.styleable.XCArcMenuView_radius, (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 150, getResources().getDisplayMetrics())); Log.v("czm", "mPosition = " + mPosition + ",mRadius = "+mRadius); a.recycle(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // TODO Auto-generated method stub int count = getChildCount(); for(int i = 0; i 3.使用卫星式菜单类
package com.xc.xcskin; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Toast; import com.xc.xcskin.view.XCArcMenuView; import com.xc.xcskin.view.XCArcMenuView.OnMenuItemClickListener; import com.xc.xcskin.view.XCGuaguakaView; import com.xc.xcskin.view.XCGuaguakaView.OnCompleteListener; /** * 使用并测试自定义卫星式菜单View * @author caizhiming * */ public class XCArcMenuViewDemo extends Activity{ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.xc_arcmenu_view_demo); XCArcMenuView view = (XCArcMenuView) findViewById(R.id.arcmenu); view.setOnMenuItemClickListener(new OnMenuItemClickListener() { @Override public void onClick(View view, int pos) { // TODO Auto-generated method stub String tag = (String) view.getTag(); Toast.makeText(XCArcMenuViewDemo.this, tag, Toast.LENGTH_SHORT).show(); } }); } }三、总结
Android实现自定义的卫星式菜单(弧形菜单)的内容到这就基本结束了，感兴趣的朋友们可以动手操作起来，只有自己实践了才能更深的理解，希望本文对大家能有所帮助。
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