大家好，我有一个扩展RelativeLayout的类，它接收和添加以编程方式创建的ImageView与上下文，但添加的图像总是在中心，而我需要它们在父母顶部对齐，我有试图添加规则，但它返回null，这是我的代码：
public class ArcMenu extends RelativeLayout {
private static ArcLayout mArcLayout;
private static ImageView mHintView;
private static ViewGroup controlLayout;
private static boolean shouldDisapear = false;
Animation animation;
public ArcMenu(Context context) {
super(context);
init(context);
}
public ArcMenu(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
applyAttrs(attrs);
}
public void shouldDisapear(boolean should){
shouldDisapear = should;
postDelayed(new Runnable() {
@Override
public void run() {
mArcLayout.setVisibility(View.GONE);
controlLayout.setVisibility(View.GONE);
mHintView.setVisibility(View.GONE);
}
}, 400);
}
private void init(Context context) {
LayoutInflater li = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
li.inflate(R.layout.arc_menu, this);
mArcLayout = (ArcLayout) findViewById(R.id.item_layout);
controlLayout = (ViewGroup) findViewById(R.id.control_layout);
controlLayout.setClickable(true);
controlLayout.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
mHintView.startAnimation(createHintSwitchAnimation(mArcLayout.isExpanded()));
if(!shouldDisapear){
mArcLayout.switchState(true);
}
}
return false;
}
});
mHintView = (ImageView) findViewById(R.id.control_hint);
}
public void setAngle(int from, int to){
mArcLayout.setArc(from,to);
}
public void setChildSize(int size){
mArcLayout.setChildSize(size);
}
public void setControlHintBackGround(Drawable drawable){
mHintView.setImageDrawable(drawable);
}
public void setControlHintBackGround(int resource){
mHintView.setImageResource(resource);
}
@SuppressLint("NewApi")
@SuppressWarnings("deprecation")
public void setControlLayoutBackground(Drawable drawable){
if(android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.JELLY_BEAN) {
controlLayout.setBackgroundDrawable(drawable);
}else{
controlLayout.setBackground(drawable);
}
}
public void setControlLayoutBackground(int resource){
controlLayout.setBackgroundResource(resource);
}
public void Expand(){
if(mArcLayout.getVisibility() == View.GONE){
mArcLayout.setVisibility(View.VISIBLE);
controlLayout.setVisibility(View.VISIBLE);
mHintView.setVisibility(View.VISIBLE);
}
postDelayed(new Runnable() {
@Override
public void run() {
mHintView.startAnimation(createHintSwitchAnimation(mArcLayout.isExpanded()));
}
}, 50);
}
public boolean isExpanded(){
return mArcLayout.isExpanded();
}
private void applyAttrs(AttributeSet attrs) {
if (attrs != null) {
TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.ArcLayout, 0, 0);
float fromDegrees = a.getFloat(R.styleable.ArcLayout_fromDegrees, ArcLayout.DEFAULT_FROM_DEGREES);
float toDegrees = a.getFloat(R.styleable.ArcLayout_toDegrees, ArcLayout.DEFAULT_TO_DEGREES);
mArcLayout.setArc(90,180);
int defaultChildSize = mArcLayout.getChildSize();
int newChildSize = a.getDimensionPixelSize(R.styleable.ArcLayout_childSize, defaultChildSize);
mArcLayout.setChildSize(newChildSize);
a.recycle();
}
}
public void addItem(View item, OnClickListener listener) {
mArcLayout.addView(item);
item.setOnClickListener(getItemClickListener(listener));
}
private OnClickListener getItemClickListener(final OnClickListener listener) {
return new OnClickListener() {
@Override
public void onClick(final View viewClicked) {
Animation animation = bindItemAnimation(viewClicked, true, 400);
animation.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationRepeat(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
postDelayed(new Runnable() {
@Override
public void run() {
itemDidDisappear();
if(shouldDisapear){
mArcLayout.setVisibility(View.GONE);
controlLayout.setVisibility(View.GONE);
mHintView.setVisibility(View.GONE);
}
}
}, 0);
}
});
final int itemCount = mArcLayout.getChildCount();
for (int i = 0; i < itemCount; i++) {
View item = mArcLayout.getChildAt(i);
if (viewClicked != item) {
bindItemAnimation(item, false, 300);
}
}
mArcLayout.invalidate();
mHintView.startAnimation(createHintSwitchAnimation(true));
if (listener != null) {
listener.onClick(viewClicked);
}
}
};
}
private Animation bindItemAnimation(final View child, final boolean isClicked, final long duration) {
Animation animation = createItemDisapperAnimation(duration, isClicked);
child.setAnimation(animation);
return animation;
}
private void itemDidDisappear() {
final int itemCount = mArcLayout.getChildCount();
for (int i = 0; i < itemCount; i++) {
View item = mArcLayout.getChildAt(i);
item.clearAnimation();
}
if(!shouldDisapear){
mArcLayout.switchState(false);
}
}
private static Animation createItemDisapperAnimation(final long duration, final boolean isClicked) {
AnimationSet animationSet = new AnimationSet(true);
animationSet.addAnimation(new ScaleAnimation(1.0f, isClicked ? 2.0f : 0.0f, 1.0f, isClicked ? 2.0f : 0.0f,
Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f));
animationSet.addAnimation(new AlphaAnimation(1.0f, 0.0f));
animationSet.setDuration(duration);
animationSet.setInterpolator(new DecelerateInterpolator());
animationSet.setFillAfter(true);
return animationSet;
}
private static Animation createHintSwitchAnimation(final boolean expanded) {
Animation animation = new RotateAnimation(expanded ? 45 : 0, expanded ? 0 : 45, Animation.RELATIVE_TO_SELF,
0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
mArcLayout.switchState(true);
animation.setStartOffset(0);
animation.setDuration(500);
animation.setInterpolator(new DecelerateInterpolator());
animation.setFillAfter(true);
animation.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
// TODO Auto-generated method stub
}
@Override
public void onAnimationRepeat(Animation animation) {
// TODO Auto-generated method stub
}
@Override
public void onAnimationEnd(Animation animation) {
if(shouldDisapear && expanded){
mArcLayout.setVisibility(View.GONE);
controlLayout.setVisibility(View.GONE);
mHintView.setVisibility(View.GONE);
}
}
});
return animation;
}
}
，这是xml：
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
>
<com.capricorn.ArcLayout
xmlns:custom="http://schemas.android.com/apk/res-auto"
android:id="@+id/item_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
custom:childSize="44dp"
custom:fromDegrees="270.0"
custom:toDegrees="360.0" />
<FrameLayout
android:id="@+id/control_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
>
<ImageView
android:id="@+id/control_hint"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:duplicateParentState="true"
/>
</FrameLayout>
请帮忙吗？
答案 0 :(得分：0)
我无法在您的班级中查看您在哪里使用规则，但您可以使用addItem()方法执行此操作：
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams)item.getLayoutParams();
params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
params.addRule(RelativeLayout.ALIGN_PARENT_TOP);
item.setLayoutParams(params);