ArcMenu mainImage我需要在屏幕的底部。 OnMeasure不會讓它進入屏幕底部

Question

我正在嘗試將mainImg帶到屏幕的底部。

/* 
* Copyright (C) 2012 Capricorn 
* 
* Licensed under the Apache License, Version 2.0 (the "License"); 
* you may not use this file except in compliance with the License. 
* You may obtain a copy of the License at 
* 
*  http://www.apache.org/licenses/LICENSE-2.0 
* 
* Unless required by applicable law or agreed to in writing, software 
* distributed under the License is distributed on an "AS IS" BASIS, 
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
* See the License for the specific language governing permissions and 
* limitations under the License. 
*/ 

在ArcLayoutOnMeasure如果我改變大小爲0它的到來了，但動畫會消失。 如何更改OnMeasure使img降到屏幕的底部並且高度應該向上？請幫忙！

package com.example.splashscreen; 

import android.content.Context; 
import android.content.res.TypedArray; 
import android.graphics.Rect; 
import android.util.AttributeSet; 
import android.view.View; 
import android.view.ViewGroup; 
import android.view.animation.AccelerateInterpolator; 
import android.view.animation.Animation; 
import android.view.animation.AnimationSet; 
import android.view.animation.Interpolator; 
import android.view.animation.LinearInterpolator; 
import android.view.animation.OvershootInterpolator; 
import android.view.animation.RotateAnimation; 
import android.view.animation.Animation.AnimationListener; 

/** 
* A Layout that arranges its children around its center. The arc can be set by 
* calling {@link #setArc(float, float) setArc()}. You can override the method 
* {@link #onMeasure(int, int) onMeasure()}, otherwise it is always 
* WRAP_CONTENT. 
* 
* @author Capricorn 
* 
*/ 
public class ArcLayout extends ViewGroup { 
    /** 
    * children will be set the same size. 
    */ 
    private int mChildSize; 

    private int mChildPadding = 5; 

    private int mLayoutPadding = 10; 

    public static final float DEFAULT_FROM_DEGREES = 270.0f; 

    public static final float DEFAULT_TO_DEGREES = 360.0f; 

    private float mFromDegrees = DEFAULT_FROM_DEGREES; 

    private float mToDegrees = DEFAULT_TO_DEGREES; 

    private static final int MIN_RADIUS = 150; 

    /* the distance between the layout's center and any child's center */ 
    private int mRadius; 

    private boolean mExpanded = false; 

    public ArcLayout(Context context) { 
     super(context); 
    } 

    public ArcLayout(Context context, AttributeSet attrs) { 
     super(context, attrs); 

     if (attrs != null) { 
      TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.ArcLayout, 0, 0); 
      mFromDegrees = a.getFloat(R.styleable.ArcLayout_fromDegrees, DEFAULT_FROM_DEGREES); 
      mToDegrees = a.getFloat(R.styleable.ArcLayout_toDegrees, DEFAULT_TO_DEGREES); 
      mChildSize = Math.max(a.getDimensionPixelSize(R.styleable.ArcLayout_childSize, 0), 0); 

      a.recycle(); 
     } 
    } 

    private static int computeRadius(final float arcDegrees, final int childCount, final int childSize, 
      final int childPadding, final int minRadius) { 
     if (childCount < 2) { 
      return minRadius; 
     } 

     final float perDegrees = arcDegrees/(childCount - 1); 
     final float perHalfDegrees = perDegrees/2; 
     final int perSize = childSize + childPadding; 

     final int radius = (int) ((perSize/2)/Math.sin(Math.toRadians(perHalfDegrees))); 

     return Math.max(radius, minRadius); 
    } 

    private static Rect computeChildFrame(final int centerX, final int centerY, final int radius, final float degrees, 
      final int size) { 

     final double childCenterX = centerX + radius * Math.cos(Math.toRadians(degrees)); 
     final double childCenterY = centerY + radius * Math.sin(Math.toRadians(degrees)); 

     return new Rect((int) (childCenterX - size/2), (int) (childCenterY), 
       (int) (childCenterX + size/2), (int) (childCenterY + size)); 
    } 

    @Override 
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
     final int radius = mRadius = computeRadius(Math.abs(mToDegrees - mFromDegrees), getChildCount(), mChildSize, 
       mChildPadding, MIN_RADIUS); 
     final int size = radius * 2 + mChildSize + mChildPadding + mLayoutPadding * 2; 

     setMeasuredDimension(size, size); 

     final int count = getChildCount(); 
     for (int i = 0; i < count; i++) { 
      getChildAt(i).measure(MeasureSpec.makeMeasureSpec(mChildSize, MeasureSpec.EXACTLY), 
        MeasureSpec.makeMeasureSpec(mChildSize, MeasureSpec.EXACTLY)); 
     } 
    } 

    @Override 
    protected void onLayout(boolean changed, int l, int t, int r, int b) { 
     final int centerX = getWidth()/2; 
     final int centerY = getHeight()/2; 
     final int radius = mExpanded ? mRadius : 0; 

     final int childCount = getChildCount(); 
     final float perDegrees = (mToDegrees - mFromDegrees)/(childCount - 1); 

     float degrees = mFromDegrees; 
     for (int i = 0; i < childCount; i++) { 
      Rect frame = computeChildFrame(centerX, centerY, radius, degrees, mChildSize); 
      degrees += perDegrees; 
      getChildAt(i).layout(frame.left, frame.top, frame.right, frame.bottom); 
     } 
    } 

    /** 
    * refers to {@link LayoutAnimationController#getDelayForView(View view)} 
    */ 
    private static long computeStartOffset(final int childCount, final boolean expanded, final int index, 
      final float delayPercent, final long duration, Interpolator interpolator) { 
     final float delay = delayPercent * duration; 
     final long viewDelay = (long) (getTransformedIndex(expanded, childCount, index) * delay); 
     final float totalDelay = delay * childCount; 

     float normalizedDelay = viewDelay/totalDelay; 
     normalizedDelay = interpolator.getInterpolation(normalizedDelay); 

     return (long) (normalizedDelay * totalDelay); 
    } 

    private static int getTransformedIndex(final boolean expanded, final int count, final int index) { 
     if (expanded) { 
      return count - 1 - index; 
     } 

     return index; 
    } 

    private static Animation createExpandAnimation(float fromXDelta, float toXDelta, float fromYDelta, float toYDelta, 
      long startOffset, long duration, Interpolator interpolator) { 
     Animation animation = new RotateAndTranslateAnimation(0, toXDelta, 0, toYDelta, 0, 720); 
     animation.setStartOffset(startOffset); 
     animation.setDuration(duration); 
     animation.setInterpolator(interpolator); 
     animation.setFillAfter(true); 

     return animation; 
    } 

    private static Animation createShrinkAnimation(float fromXDelta, float toXDelta, float fromYDelta, float toYDelta, 
      long startOffset, long duration, Interpolator interpolator) { 
     AnimationSet animationSet = new AnimationSet(false); 
     animationSet.setFillAfter(true); 

     final long preDuration = duration/2; 
     Animation rotateAnimation = new RotateAnimation(0, 360, Animation.RELATIVE_TO_SELF, 0.5f, 
       Animation.RELATIVE_TO_SELF, 0.5f); 
     rotateAnimation.setStartOffset(startOffset); 
     rotateAnimation.setDuration(preDuration); 
     rotateAnimation.setInterpolator(new LinearInterpolator()); 
     rotateAnimation.setFillAfter(true); 

     animationSet.addAnimation(rotateAnimation); 

     Animation translateAnimation = new RotateAndTranslateAnimation(0, toXDelta, 0, toYDelta, 360, 720); 
     translateAnimation.setStartOffset(startOffset + preDuration); 
     translateAnimation.setDuration(duration - preDuration); 
     translateAnimation.setInterpolator(interpolator); 
     translateAnimation.setFillAfter(true); 

     animationSet.addAnimation(translateAnimation); 

     return animationSet; 
    } 

    private void bindChildAnimation(final View child, final int index, final long duration) { 
     final boolean expanded = mExpanded; 
     final int centerX = getWidth()/2; 
     final int centerY = getHeight()/2; 
     final int radius = expanded ? 0 : mRadius; 

     final int childCount = getChildCount(); 
     final float perDegrees = (mToDegrees - mFromDegrees)/(childCount - 1); 
     Rect frame = computeChildFrame(centerX, centerY, radius, mFromDegrees + index * perDegrees, mChildSize); 

     final int toXDelta = frame.left - child.getLeft(); 
     final int toYDelta = frame.top - child.getTop(); 

     Interpolator interpolator = mExpanded ? new AccelerateInterpolator() : new OvershootInterpolator(1.5f); 
     final long startOffset = computeStartOffset(childCount, mExpanded, index, 0.1f, duration, interpolator); 

     Animation animation = mExpanded ? createShrinkAnimation(0, toXDelta, 0, toYDelta, startOffset, duration, 
       interpolator) : createExpandAnimation(0, toXDelta, 0, toYDelta, startOffset, duration, interpolator); 

     final boolean isLast = getTransformedIndex(expanded, childCount, index) == childCount - 1; 
     animation.setAnimationListener(new AnimationListener() { 

      @Override 
      public void onAnimationStart(Animation animation) { 

      } 

      @Override 
      public void onAnimationRepeat(Animation animation) { 

      } 

      @Override 
      public void onAnimationEnd(Animation animation) { 
       if (isLast) { 
        postDelayed(new Runnable() { 

         @Override 
         public void run() { 
          onAllAnimationsEnd(); 
         } 
        }, 0); 
       } 
      } 
     }); 

     child.setAnimation(animation); 
    } 

    public boolean isExpanded() { 
     return mExpanded; 
    } 

    public void setArc(float fromDegrees, float toDegrees) { 
     if (mFromDegrees == fromDegrees && mToDegrees == toDegrees) { 
      return; 
     } 

     mFromDegrees = fromDegrees; 
     mToDegrees = toDegrees; 

     requestLayout(); 
    } 

    public void setChildSize(int size) { 
     if (mChildSize == size || size < 0) { 
      return; 
     } 

     mChildSize = size; 

     requestLayout(); 
    } 

    /** 
    * switch between expansion and shrinkage 
    * 
    * @param showAnimation 
    */ 
    public void switchState(final boolean showAnimation) { 
     if (showAnimation) { 
      final int childCount = getChildCount(); 
      for (int i = 0; i < childCount; i++) { 
       bindChildAnimation(getChildAt(i), i, 300); 
      } 
     } 

     mExpanded = !mExpanded; 

     if (!showAnimation) { 
      requestLayout(); 
     } 

     invalidate(); 
    } 

    private void onAllAnimationsEnd() { 
     final int childCount = getChildCount(); 
     for (int i = 0; i < childCount; i++) { 
      getChildAt(i).clearAnimation(); 
     } 

     requestLayout(); 
    } 
} 

Answer 1

正如您在以下daCapricorn comment中看到的類似問題所報告的。

他給了有關可能的解決方案的詳細信息：

設置機器人：layout_alignParentBottom = 「真」 和android：在XML layout_alignParentLeft = 「true」，並計算marginBottom和marginLeft（他們應該負）編程。 marginBottom =（ArcMenu的高度centerIcon的高度）/ 2，marginLeft =（ArcMenu的寬度 - centerIcon的寬度）/ 2。

這裏的主要想法是將所需的邊距設置爲負值（我的情況是右下角）。 我已經設法通過計算所需的邊距來解決這個問題。marginBottom = - （（ArcMenu's height centerIcon's height）/ 2），marginRight = - （（ArcMenu's width - centerIcon's width）/ 2）。

我沒有在庫代碼的ArcLayout.java中的onMeasure中執行此操作，我在我的活動中執行了以下操作。

在我的活動的佈局設置layout_alignParent根據需要：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:arc="http://schemas.android.com/apk/res-auto" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" > 

    <com.capricorn.ArcMenu 
     android:layout_alignParentBottom="true" 
     android:layout_alignParentRight="true" 
     android:id="@+id/arc_menu" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     arc:childSize="@dimen/menuChildSize" 
     arc:fromDegrees="180" 
     arc:toDegrees="270" /> 

</RelativeLayout> 

在我的活動：

ArcMenu arcMenu; // the arc menu 
FrameLayout controlLayout; // the frame layout of the control from library 
int arcWidth, arcHeight; // arc menu measurments to be calculated , required for margins 
int controlLayoutWidth, controlLayoutHeight; // controlLayout measurments to be calculated , required for margins 
boolean isArcMeasureReady, isControlLayoutMeasureReady; // determine if measurements are ready if so apply the margins with the following runnable 
Runnable runnable = new Runnable() { 

    @Override 
    public void run() { 
     if (isArcMeasureReady && isControlLayoutMeasureReady) { 
      RelativeLayout.LayoutParams params = (LayoutParams) arcMenu // your container LayoutParmas , mine is RelativeLayout 
        .getLayoutParams(); 
      int rightMargin = -((arcWidth - crossWidth)/2); 
      int bottomMargin = -((arcHeight - crossHeight)/2); 
      params.setMargins(0, 0, rightMargin, bottomMargin); 
      arcMenu.setLayoutParams(params); 
     } 
    } 
}; 

我的onCreate：

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    isArcMeasureReady = isControlLayoutMeasureReady = false; 
    controlLayout = (FrameLayout) findViewById(com.capricorn.R.id.control_layout); 
    ... 

    ViewTreeObserver viewTreeObserverControlLayout = controlLayout.getViewTreeObserver(); 
    if (viewTreeObserverControlLayout.isAlive()) { 
     viewTreeObserverControlLayout 
       .addOnGlobalLayoutListener(new OnGlobalLayoutListener() { 
        @Override 
        public void onGlobalLayout() { 
         controlLayout.getViewTreeObserver() 
           .removeGlobalOnLayoutListener(this); 
         controlLayoutWidth = controlLayout.getWidth(); 
         controlLayoutHeight = controlLayout.getHeight(); 
         isControlLayoutMeasureReady = true; 

         runOnUiThread(runnable); 

        } 
       }); 
    } 

    ViewTreeObserver viewTreeObserver = arcMenu.getViewTreeObserver(); 
    if (viewTreeObserver.isAlive()) { 
     viewTreeObserver 
       .addOnGlobalLayoutListener(new OnGlobalLayoutListener() { 
        @Override 
        public void onGlobalLayout() { 
         arcMenu.getViewTreeObserver() 
           .removeGlobalOnLayoutListener(this); 
         arcWidth = arcMenu.getWidth(); 
         arcHeight = arcMenu.getHeight(); 
         isArcMeasureReady = true; 

         runOnUiThread(runnable); 
        } 
       }); 
    } 

我測試了多臺設備上，它因爲計算是動態的，所以效果很好。

希望這有助於從這個傢伙daCapricorn