Android小白第一次寫博客，心情無比激動(dòng)。下面給大家展示一下衛(wèi)星菜單的實(shí)現(xiàn)。
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1.簡單介紹衛(wèi)星菜單
在應(yīng)用程序中，有很多展示菜單的方式，但其功能都是大同小異，這樣一來，菜單的美觀以及展示方式就顯的尤為重要，衛(wèi)星菜單就是很不錯(cuò)的一種。下面是本案例的gif圖：
2.學(xué)習(xí)本案例需要的知識點(diǎn)
（1）動(dòng)畫
（2）自定義ViewGroup
（3）自定義屬性
a、attr.xml
b、在布局中使用自定義屬性
c、在代碼中獲取自定義屬性值
3.首先分析我們的衛(wèi)星菜單需要那些自定義屬性并書寫代碼
首先，菜單可以顯示在屏幕的四個(gè)角，所以我們需要一個(gè)屬性來確定它的位置，菜單在屏幕的四個(gè)角比較美觀，在這里用到枚舉。
其次，我們還需要一個(gè)展開半徑，因此還需要自定義半徑。
下面是attr.xml
<?xml version="1.0" encoding="utf-8"?>
4.自定義ViewGroup
–繼承ViewGroup 以相關(guān)屬性
重慶分公司
重慶分公司
public class SateMenu extends ViewGroup implements View.OnClickListener {
private int animationTime; //動(dòng)畫時(shí)間
private int radius; //展開半徑
private int pos; //從自定義屬性中獲取的菜單位置
private State state; //菜單狀態(tài)
private int l = 0, t = 0; //左上值
private View centerBtn = null; //展開按鈕
private MenuItemListener menuItemListener; //菜單項(xiàng)點(diǎn)擊監(jiān)聽
private Position position; //枚舉型菜單位置
private enum Position { //位置枚舉
LEFT_TOP, LEFT_BOTTOM, RIGHT_TOP, RIGHT_BOTTOM
}
private enum State { //菜單狀態(tài)枚舉
OPEN, COLSE
}–構(gòu)造方法
public SateMenu(Context context) {
//一個(gè)參數(shù)構(gòu)造方法調(diào)用兩個(gè)參數(shù)構(gòu)造方法
this(context, null);
}
public SateMenu(Context context, AttributeSet attrs) {
//兩個(gè)參數(shù)構(gòu)造方法調(diào)用三個(gè)個(gè)參數(shù)構(gòu)造方法
this(context, attrs, 0);
}
public SateMenu(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
animationTime = 500; //設(shè)置動(dòng)畫展開時(shí)間
TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.SateMenu, defStyleAttr, 0); //獲取自定義屬性值集合
radius = (int) a.getDimension(R.styleable.SateMenu_radius,
TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 100, getResources().getDisplayMetrics())); //獲取半徑并轉(zhuǎn)化為像素值
state = State.COLSE; //設(shè)置菜單默認(rèn)關(guān)閉
pos = a.getInt(R.styleable.SateMenu_position, 0); //獲取位置
//將位置轉(zhuǎn)化為枚舉值 （這樣就把無意義的int轉(zhuǎn)化為有意義的枚舉值）
switch (pos) {
case 0:
position = Position.LEFT_TOP;
break;
case 1:
position = Position.LEFT_BOTTOM;
break;
case 2:
position = Position.RIGHT_TOP;
break;
case 3:
position = Position.RIGHT_BOTTOM;
break;
}
}–重寫onMeasure方法
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int count = getChildCount();
//測量子view
for (int i = 0; i < count; i++) {
measureChild(getChildAt(i), widthMeasureSpec, heightMeasureSpec);
}
}–重寫onLayout方法
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
if (changed)
btnLayout();
}
private void btnLayout() {
centerBtn = getChildAt(0);
if (position == Position.RIGHT_BOTTOM || position == Position.RIGHT_TOP) {
//如果菜單設(shè)置在屏幕的右側(cè)，那么展開按鈕的l值=ViewGroup寬度-按鈕寬度
l = getMeasuredWidth() - centerBtn.getMeasuredWidth();
}
if (position == Position.LEFT_BOTTOM || position == Position.RIGHT_BOTTOM) {
//如果菜單設(shè)置在屏幕的下邊，那么展開按鈕的t值=ViewGroup高度-按鈕高度
t = getMeasuredHeight() - centerBtn.getMeasuredHeight();
}
//設(shè)置展開按鈕位置
centerBtn.layout(l, t, l + centerBtn.getMeasuredWidth(), t + centerBtn.getMeasuredHeight());
childBtnlayout(); //設(shè)置子按鈕位置
centerBtn.setOnClickListener(this);
}–設(shè)置子按鈕位置需要一點(diǎn)點(diǎn)數(shù)學(xué)知識，下面我以主菜單在右下角為例，畫一個(gè)簡圖，圖片對應(yīng)右側(cè)第一個(gè)公式
private void childBtnlayout() {
int childMuneCount = getChildCount() - 1;
//角度等于90度/子按鈕個(gè)數(shù)-1
float a = (float) (Math.PI / 2 / (childMuneCount - 1));
int cl, ct; //分別是子按鈕的 左 上
for (int i = 0; i < childMuneCount; i++) {
if (position == Position.RIGHT_BOTTOM || position == Position.RIGHT_TOP) {
cl = (int) (l - radius * Math.cos(i * a));
} else {
cl = (int) (l + radius * Math.cos(i * a));
}
if (position == Position.LEFT_TOP || position == Position.RIGHT_TOP) {
ct = (int) (t + radius * Math.sin(i * a));
} else {
ct = (int) (t - radius * Math.sin(i * a));
}
View childView = getChildAt(i + 1);
childView.layout(cl, ct, cl + childView.getMeasuredWidth(), ct + childView.getMeasuredHeight());
childView.setOnClickListener(this);
childView.setTag(i);
childView.setVisibility(View.GONE);
}
}–動(dòng)畫的展開與關(guān)閉，這里沒有用屬性動(dòng)畫，原理是：當(dāng)用戶關(guān)閉菜單的時(shí)候，將子按鈕隱藏，打開才打的時(shí)候在把子按鈕顯示出來
private void changeState() {
int childMuneCount = getChildCount() - 1;
//設(shè)置展開按鈕旋轉(zhuǎn)動(dòng)畫
Animation animation = new RotateAnimation(0, 360, centerBtn.getMeasuredWidth() / 2, centerBtn.getMeasuredHeight() / 2);
animation.setDuration(animationTime);
centerBtn.setAnimation(animation);
animation.start();
View childView;
//子按鈕有兩個(gè)動(dòng)畫（位移、旋轉(zhuǎn)），所以這里用到動(dòng)畫集，這里也涉及到一些數(shù)學(xué)知識，和之前設(shè)置子按鈕位置差不多
AnimationSet animationSet;
Animation translateAnimation;
Animation rotateAnimation;
int cl, ct;
float a = (float) (Math.PI / 2 / (childMuneCount - 1));
if (state == State.OPEN) {
state = State.COLSE;
for (int i = 0; i < childMuneCount; i++) {
if (position == Position.RIGHT_BOTTOM || position == Position.RIGHT_TOP)
cl = (int) (radius * Math.cos(i * a));
else
cl = (int) (-radius * Math.cos(i * a));
if (position == Position.LEFT_TOP || position == Position.RIGHT_TOP)
ct = (int) (-radius * Math.sin(i * a));
else
ct = (int) (radius * Math.sin(i * a));
childView = getChildAt(i + 1);
childView.setVisibility(View.GONE);
translateAnimation = new TranslateAnimation(0, cl, 0, ct);
translateAnimation.setDuration(animationTime);
rotateAnimation = new RotateAnimation(0, 360, childView.getMeasuredHeight() / 2, childView.getMeasuredHeight() / 2);
rotateAnimation.setDuration(animationTime);
animationSet = new AnimationSet(true);
animationSet.addAnimation(rotateAnimation);
animationSet.addAnimation(translateAnimation);
childView.setAnimation(animationSet);
animationSet.start();
childView.setVisibility(View.GONE);
}
} else {
state = State.OPEN;
for (int i = 0; i < childMuneCount; i++) {
if (position == Position.RIGHT_BOTTOM || position == Position.RIGHT_TOP)
cl = (int) (radius * Math.cos(i * a));
else
cl = (int) (-radius * Math.cos(i * a));
if (position == Position.LEFT_TOP || position == Position.RIGHT_TOP)
ct = (int) (-radius * Math.sin(i * a));
else
ct = (int) (radius * Math.sin(i * a));
childView = getChildAt(i + 1);
childView.setVisibility(View.GONE);
translateAnimation = new TranslateAnimation(cl, 0, ct, 0);
translateAnimation.setDuration(animationTime);
rotateAnimation = new RotateAnimation(360, 0, childView.getMeasuredHeight() / 2, childView.getMeasuredHeight() / 2);
rotateAnimation.setDuration(animationTime);
animationSet = new AnimationSet(true);
animationSet.addAnimation(rotateAnimation);
animationSet.addAnimation(translateAnimation);
childView.setAnimation(animationSet);
animationSet.start();
childView.setVisibility(View.VISIBLE);
}
}
}–寫到這里我們的衛(wèi)星菜單已經(jīng)可以展現(xiàn)出來的，運(yùn)行一下，效果還是不錯(cuò)的。美中不足的是，子按鈕還沒有點(diǎn)擊事件，下面我們就將這個(gè)小小的不足補(bǔ)充一下。我們可以通過給子按鈕添加點(diǎn)擊事件來監(jiān)聽它，但點(diǎn)擊之后要做的事情不可能寫在ViewGroup中，這就需要用接口進(jìn)行回調(diào)。大家看一下在設(shè)置子按鈕位置的時(shí)候有這樣一句代碼 childView.setTag(i); 它的目的就是給子按鈕添加索引，接下來看一下具體怎樣實(shí)現(xiàn)的。
@Override
public void onClick(View v) {
if (v.getId() == centerBtn.getId()) {
changeState();
} else {
if (menuItemListener != null) {
menuItemListener.onclick((Integer) v.getTag());
}
}
}
public interface MenuItemListener {
void onclick(int position);
}
public void setMenuItemListener(MenuItemListener menuItemListener) {
this.menuItemListener = menuItemListener;
}–到這里我們已經(jīng)完全實(shí)現(xiàn)了衛(wèi)星菜單的所有功能，但大家有沒有發(fā)現(xiàn)，一些菜單在展開之后，我們點(diǎn)擊其他區(qū)域，菜單會(huì)自動(dòng)收起來，所以我們還要給我們的ViewGroup添加onTouchEvent事件，在菜單展開的時(shí)候，他把菜單收起來，并將此次點(diǎn)擊攔截。
@Override
public boolean onTouchEvent(MotionEvent event) {
if (state == State.OPEN) {
changeState();
return true; //攔截
}
return super.onTouchEvent(event);
}5.下面試用一下我們編寫的衛(wèi)星菜單，看一下成果。
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
MainActivity.java
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SateMenu sateMenu = (SateMenu) findViewById(R.id.menu_id);
sateMenu.setMenuItemListener(new SateMenu.MenuItemListener() {
@Override
public void onclick(int position) {
Toast.makeText(MainActivity.this, "-- "+position, Toast.LENGTH_SHORT).show();
}
});
}
}以上所述是小編給大家介紹的Android衛(wèi)星菜單效果的實(shí)現(xiàn)方法，希望對大家有所幫助，如果大家有任何疑問歡迎給我留言，小編會(huì)及時(shí)回復(fù)大家的！
