上一篇为大家介绍了关于自定义属性设置方法,本篇我将为大家介绍一下如何通过按钮来控制Menu的显示和隐藏,为了达到这个效果我们需要在SlidingMenu中添加三个方法,用来达到实现上述效果的目的。
我们的SlidingMenu代码:
public class SlidingMenu extends HorizontalScrollView { private LinearLayout mWapper; private ViewGroup mMenu; private ViewGroup mContent; private int mScreenWidth;//屏幕的宽度 private int mMenuWidth;//设置Menu的宽度 //dp private int mMenuRightPadding; private boolean once = false; private boolean isOpen = false;//标示菜单的状态:隐藏 or 显示 public SlidingMenu(Context context) { this(context, null); } /** * 未使用自定义属性时调用此方法 * @param context * @param attrs */ public SlidingMenu(Context context, AttributeSet attrs) { this(context, attrs, 0); } /** * 当使用了自定义的样式时调用 * @param context * @param attrs * @param defStyle */ public SlidingMenu(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); //获取我们定义的属性 TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.SlidingMenu, defStyle, 0); int n = a.getIndexCount();//获得设置的自定义属性个数 for(int i=0; i<n; i++){ int attr = a.getIndex(i); switch (attr) { case R.styleable.SlidingMenu_rightPadding: mMenuRightPadding = a.getDimensionPixelSize(attr, (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50, context.getResources().getDisplayMetrics())); break; } } a.recycle(); WindowManager wm = (WindowManager) context.getSystemService(context.WINDOW_SERVICE); DisplayMetrics outMetrics = new DisplayMetrics(); wm.getDefaultDisplay().getMetrics(outMetrics ); mScreenWidth = outMetrics.widthPixels; } /** * 设置内部View的宽和高,以及自己的宽和高 */ @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); if(!once){ mWapper = (LinearLayout) getChildAt(0); mMenu = (ViewGroup) mWapper.getChildAt(0); mContent = (ViewGroup) mWapper.getChildAt(1); mMenuWidth = mMenu.getLayoutParams().width = mScreenWidth - mMenuRightPadding; mContent.getLayoutParams().width = mScreenWidth; once = true; } } /** * 设置子View的放置位置 * 通过设置偏移量来隐藏Menu */ @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); if(changed){ this.scrollTo(mMenuWidth, 0); } } /** * 控制手指的滑动效果 */ @Override public boolean onTouchEvent(MotionEvent ev) { int action = ev.getAction(); switch (action) { case MotionEvent.ACTION_UP: int scrollx = getScrollX();//Menu左侧隐藏的区域宽度 if(scrollx >= mMenuWidth/2){ this.smoothScrollTo(mMenuWidth, 0); isOpen = false; }else{ this.smoothScrollTo(0, 0); isOpen = true; } return true; } return super.onTouchEvent(ev); } /** * 打开菜单 */ public void OpenMenu(){ if(isOpen){ return; }else{ this.smoothScrollTo(0, 0); isOpen = true; } } /** * 关闭菜单 */ public void CloseMenu(){ if(isOpen){ this.smoothScrollTo(mMenuWidth, 0); isOpen = false; }else{ return; } } /** * 切换菜单 */ public void Toggle(){ if(isOpen){ CloseMenu(); }else{ OpenMenu(); } } }
与之前代码不同的地方我已经为大家特别标注,相信大家不难理解。
我们布局文件代码:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:hyman="http://schemas.android.com/apk/res/com.example.android_qq_view" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <com.example.menu.SlidingMenu android:id="@+id/slidingMenu" android:layout_width="match_parent" android:layout_height="match_parent" hyman:rightPadding="100dp" > <LinearLayout android:layout_width="wrap_content" android:layout_height="match_parent" android:orientation="horizontal" > <include layout="@layout/left_menu"/> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/qq" > <Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="切换按钮" /> </LinearLayout> </LinearLayout> </com.example.menu.SlidingMenu> </RelativeLayout>
我们的MainActivity:
public class MainActivity extends Activity { private Button button; private SlidingMenu sm ; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); sm = (SlidingMenu) findViewById(R.id.slidingMenu); button = (Button) findViewById(R.id.button); button.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { sm.Toggle(); } }); } }
到这里我们的切换效果就已经实现了。