在Android项目中使用View实现一个侧滑菜单

//侧滑方向-从哪侧滑出
 public static enum Positon {
 LEFT, RIGHT
 }
 private Context mContext;
 private Activity mActivity;
 private Scroller mScroller = null;
 //侧滑菜单布局View
 private View mMenuView;
 //底部蒙层View
 private View mMaskView;
 private int mMenuWidth = 0;
 //屏幕宽度
 private int mScreenWidth = 0;
 //是否在滑动中
 private boolean mIsMoving = false;
 //显示登录界面与否
 private boolean mShow = false;
 //滑动动画时间
 private int mDuration = 600;
 //缺省侧滑方向为左
 private Positon mPositon = Positon.LEFT;

**
 * 创建侧滑菜单View
 */
 public static XCSlideView create(Activity activity) {
 XCSlideView view = new XCSlideView(activity);
 return view;
 }
 /**
 * 创建侧滑菜单View
 */
 public static XCSlideView create(Activity activity, Positon positon) {
 XCSlideView view = new XCSlideView(activity);
 view.mPositon = positon;
 return view;
 }

/**
 * 创建 蒙层View并添加到contentView中
 */
 private void attachToContentView(Activity activity, Positon positon) {
 mPositon = positon;
 ViewGroup contentFrameLayout = (ViewGroup) activity.findViewById(android.R.id.content);
 ViewGroup contentView = ((ViewGroup) contentFrameLayout.getChildAt(0));
 mMaskView = new View(activity);
 mMaskView.setBackgroundColor(mContext.getResources().getColor(R.color.mask_color));
 contentView.addView(mMaskView, contentView.getLayoutParams());
 mMaskView.setVisibility(View.GONE);
 mMaskView.setClickable(true);
 mMaskView.setOnClickListener(new OnClickListener() {
 @Override
 public void onClick(View view) {
 if (isShow()) {
  dismiss();
 }
 }
 });
 }

/**
 * 设置侧滑菜单View，并添加到DectorView->LinearLayout->内容显示区域View中
 */
 public void setMenuView(Activity activity, View view) {
 mActivity = activity;
 mMenuView = view;
 LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
 addView(mMenuView, params);
 mMenuView.post(new Runnable() {
 @Override
 public void run() {
 // TODO Auto-generated method stub
 mMenuWidth = mMenuView.getWidth();
 switch (mPositon) {
  case LEFT:
  XCSlideView.this.scrollTo(mScreenWidth, 0);
  break;
  case RIGHT:
  XCSlideView.this.scrollTo(-mScreenWidth, 0);
  break;
 }

 }
 });
 ViewGroup contentFrameLayout = (ViewGroup) activity.findViewById(android.R.id.content);
 ViewGroup contentView = contentFrameLayout;
 contentView.addView(this);
 FrameLayout.LayoutParams layoutParams = (FrameLayout.LayoutParams) this.getLayoutParams();
 switch (mPositon) {
 case LEFT:
 layoutParams.gravity = Gravity.LEFT;
 layoutParams.leftMargin = 0;
 break;
 case RIGHT:
 layoutParams.gravity = Gravity.RIGHT;
 layoutParams.rightMargin = 0;
 break;
 }
 TextView titleFrameLayout = (TextView) activity.findViewById(android.R.id.title);
 if( titleFrameLayout != null){
 layoutParams.topMargin = DensityUtil.getStatusBarHeight(mContext);
 }
 int flags = mActivity.getWindow().getAttributes().flags;
 int flag = (flags & WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
 if(flag == WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS){
 //说明状态栏使用沉浸式
 layoutParams.topMargin = DensityUtil.getStatusBarHeight(mContext);
 }
 this.setLayoutParams(layoutParams);
 }

/**
 * 显示侧滑菜单View
 */
 public void show(){
 if(isShow() && !mIsMoving)
 return;
 switch (mPositon) {
 case LEFT:
 startScroll(mMenuWidth, -mMenuWidth, mDuration);
 break;
 case RIGHT:
 startScroll(-mMenuWidth, mMenuWidth, mDuration);
 break;
 }
 switchMaskView(true);
 mShow = true;
 }
 /**
 * 蒙层显示开关
 */
 private void switchMaskView(boolean bShow){
 if(bShow){
 mMaskView.setVisibility(View.VISIBLE);
 Animation animation = new AlphaAnimation(0.0f, 1.0f);
 animation.setDuration(mDuration);
 mMaskView.startAnimation(animation);
 }else{
 mMaskView.setVisibility(View.GONE);
 }
 }
 /**
 * 关闭侧滑菜单View
 */
 public void dismiss() {
 // TODO Auto-generated method stub
 if(!isShow() && !mIsMoving)
 return;
 switch (mPositon) {
 case LEFT:
 startScroll(XCSlideView.this.getScrollX(), mMenuWidth, mDuration);
 break;
 case RIGHT:
 startScroll(XCSlideView.this.getScrollX(), -mMenuWidth, mDuration);
 break;
 }
 switchMaskView(false);
 mShow = false;
 }
 public boolean isShow(){
 return mShow;
 }
 @Override
 public void computeScroll() {
 // TODO Auto-generated method stub
 if (mScroller.computeScrollOffset()) {
 scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
 // 更新界面
 postInvalidate();
 mIsMoving = true; 
 } else {
 mIsMoving = false;
 }
 super.computeScroll();
 }
 /**
 * 拖动移动
 */
 public void startScroll(int startX, int dx,int duration){
 mIsMoving = true;
 mScroller.startScroll(startX,0,dx,0,duration);
 invalidate();
 }

private XCSlideView mSlideViewLeft;
//屏幕宽度
private int mScreenWidth = 0;
View menuViewLeft = LayoutInflater.from(mContext).inflate(R.layout.layout_slideview,null);
mSlideViewLeft = XCSlideView.create(this, XCSlideView.Positon.LEFT);
mSlideViewLeft.setMenuView(MainActivity.this, menuViewLeft);
mSlideViewLeft.setMenuWidth(mScreenWidth * 7 / 9);
Button left = (Button)findViewById(R.id.btn_left);
 left.setOnClickListener(new View.OnClickListener() {

 @Override
 public void onClick(View v) {
 // TODO Auto-generated method stub
 if (!mSlideViewLeft.isShow())
  mSlideViewLeft.show();
 }
 });