TV焦點

1.自定義屬性

<!--焦點邊框控件屬性--><declare-styleable name="EdgeView">    <attr name="scale" format="float"/>    <attr name="shadow" format="reference"/>    <attr name="border" format="reference"/>    <attr name="host" format="reference"/></declare-styleable>
2.源碼
package com.coship.homefinance.ui;import com.coship.homefinance.R;import android.animation.Animator;import android.animation.AnimatorSet;import android.animation.ObjectAnimator;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Rect;import android.graphics.RectF;import android.graphics.drawable.Drawable;import android.util.AttributeSet;import android.view.View;import android.view.ViewGroup;import android.view.ViewTreeObserver;import android.view.animation.DecelerateInterpolator;/** * EdgeView can make the focus of the more obvious */public class EdgeView extends View implements ViewTreeObserver.OnGlobalFocusChangeListener {    PRivate static final int DEFAULT_TRAN_DUR_ANIM = 200;    private static final float DEFUALT_SCALE = 1.0f;    private View mFocusContent;    private float mScale = 1.05f;    private View mOldFocusView;    private boolean mAnimEnabled = true;    private Drawable mDrawableShadow;    private Drawable mDrawableBorder;    private int mHostViewId;    public EdgeView(Context context) {        this(context, null, 0);    }    public EdgeView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public EdgeView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        TypedArray tArray = context.obtainStyledAttributes(attrs, R.styleable.EdgeView);// 獲取配置屬性        mDrawableBorder = tArray.getDrawable(R.styleable.EdgeView_border);        mDrawableShadow = tArray.getDrawable(R.styleable.EdgeView_shadow);        mScale = tArray.getFloat(R.styleable.EdgeView_scale, 1.1f);        mHostViewId = tArray.getResourceId(R.styleable.EdgeView_host, android.R.id.content);        tArray.recycle();        setFocusable(false);    }    @Override    protected void onFinishInflate() {        super.onFinishInflate();    }    @Override    protected void onAttachedToWindow() {        super.onAttachedToWindow();        ViewGroup viewGroup = (ViewGroup) getParent();        if (viewGroup != null) {            this.mFocusContent = viewGroup.findViewById(mHostViewId);            if (this.mFocusContent != null) {                mFocusContent.getViewTreeObserver().addOnGlobalFocusChangeListener(this);            }        }    }    @Override    protected void onDetachedFromWindow() {        super.onDetachedFromWindow();        if (this.mFocusContent != null) {            this.mFocusContent.getViewTreeObserver().removeOnGlobalFocusChangeListener(this);        }    }    @Override    protected void onDraw(Canvas canvas) {        canvas.save();        drawShadow(canvas);        drawBorder(canvas);        canvas.restore();        super.onDraw(canvas);    }    //draw shadow    protected void drawShadow(Canvas canvas) {        if (mDrawableShadow != null) {            RectF shadowPaddingRect = new RectF(10, 10, 10, -55);            int width = getWidth();            int height = getHeight();            Rect padding = new Rect();            mDrawableShadow.getPadding(padding);            //            int left = (int) Math.rint(shadowPaddingRect.left);            int right = (int) Math.rint(shadowPaddingRect.right);            int bottom = (int) Math.rint(shadowPaddingRect.bottom);            int top = (int) Math.rint(shadowPaddingRect.top);            //            mDrawableShadow.setBounds(-padding.left - (left), -padding.top - (top),                    width + padding.right + (right),                    height + padding.bottom + (bottom));            mDrawableShadow.draw(canvas);        }    }    //draw Border    protected void drawBorder(Canvas canvas) {        if (mDrawableBorder != null) {            RectF paddingRect = new RectF(0, 0, 0, 0);            int width = getWidth();            int height = getHeight();            Rect padding = new Rect();            // 邊框的繪制.            mDrawableBorder.getPadding(padding);            //            int left = (int) Math.rint(paddingRect.left);            int right = (int) Math.rint(paddingRect.right);            int bottom = (int) Math.rint(paddingRect.bottom);            int top = (int) Math.rint(paddingRect.top);            //            mDrawableBorder.setBounds(-padding.left - (left), -padding.top - (top),                    width + padding.right + (right), height + padding.bottom + (bottom));            mDrawableBorder.draw(canvas);        }    }    public void flyWhiteBorder(final View focusView) {        flyWhiteBorder(focusView, EdgeView.this, mScale, mScale);    }    private void flyWhiteBorder(final View focusView, View oldFocus, float scaleX, float scaleY) {        int newWidth;        int newHeight;        float oldTranslationX,oldTranslationY;        float newTranslationX,newTranslationY;        if (focusView != null) {            int[] rectNew = new int[2];     //新焦點框在屏幕的位置            focusView.getLocationOnScreen(rectNew);            oldTranslationX = oldFocus.getTranslationX();            oldTranslationY = oldFocus.getTranslationY();            newTranslationX = rectNew[0];            newTranslationY = rectNew[1];            newWidth = (int) (Math.rint(focusView.getWidth() * scaleX));            newHeight = (int) (Math.rint(focusView.getHeight() * scaleY));            ViewGroup.LayoutParams params = getLayoutParams();            params.width = newWidth;            params.height = newHeight;            setLayoutParams(params);            ObjectAnimator transAnimatorX = ObjectAnimator.ofFloat(oldFocus, "translationX", oldTranslationX, newTranslationX);            ObjectAnimator transAnimatorY = ObjectAnimator.ofFloat(oldFocus, "translationY", oldTranslationY, newTranslationY);            AnimatorSet mAnimatorSet = new AnimatorSet();            mAnimatorSet.playTogether(transAnimatorX, transAnimatorY);            mAnimatorSet.setInterpolator(new DecelerateInterpolator(1));            mAnimatorSet.setDuration(DEFAULT_TRAN_DUR_ANIM);            //添加動畫監聽            mAnimatorSet.addListener(new Animator.AnimatorListener() {                @Override                public void onAnimationStart(Animator animation) {                    if (getVisibility() != VISIBLE) {                        setVisibility(VISIBLE);                    }                }                @Override                public void onAnimationEnd(Animator animation) {                }                @Override                public void onAnimationCancel(Animator animation) {                }                @Override                public void onAnimationRepeat(Animator animation) {                }            });            mAnimatorSet.start();        }    }    @Override    public void onGlobalFocusChanged(final View oldFocus, final View newFocus) {        if (!mAnimEnabled)            return;        if (mOldFocusView != null) {            mOldFocusView.animate().scaleX(DEFUALT_SCALE).scaleY(DEFUALT_SCALE).setDuration(DEFAULT_TRAN_DUR_ANIM).start();        }        if(!isContain(mFocusContent, newFocus)){            setVisibility(GONE);            return;        }        if (newFocus != null ) {            mOldFocusView = newFocus; // 4.3以下需要自己保存.            newFocus.bringToFront();            newFocus.animate().scaleX(mScale).scaleY(mScale).setDuration(DEFAULT_TRAN_DUR_ANIM).start();            postDelayed(new Runnable() {                @Override                public void run() {                    flyWhiteBorder(newFocus);//頁面切換時view的位置更新慢導致計算不正確                }            },DEFAULT_TRAN_DUR_ANIM);        }    }    private boolean isContain(View view, View viewChild){        if(view == viewChild){            return true;        } else if(view instanceof ViewGroup){            ViewGroup viewGroup = (ViewGroup)view;            int count = viewGroup.getChildCount();            for (int i = 0; i < count; i++) {                View v = viewGroup.getChildAt(i);                if(isContain(v, viewChild)){                    return true;                }            }        }        return false;    }}