5

我正在尝试编辑这些源代码以创建一个适用于我所有视图的简单函数。

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

RelativeLayout mLayout1 = (RelativeLayout) findViewById(R.id.layout1);
RelativeLayout mLayoutToBeExpanded1 = (RelativeLayout) findViewById(R.id.layout_exp_1);
addAction(mLayout, mLayoutToBeExpanded);

RelativeLayout mLayout2 = (RelativeLayout) findViewById(R.id.layout2);
RelativeLayout mLayoutToBeExpanded2 = (RelativeLayout) findViewById(R.id.layout_exp_2);
addAction(mLayout2, mLayoutToBeExpanded2);

RelativeLayout mLayout3 = (RelativeLayout) findViewById(R.id.layout3);
RelativeLayout mLayoutToBeExpanded3 = (RelativeLayout) findViewById(R.id.layout_exp_3);
addAction(mLayout3, mLayoutToBeExpanded3);

}

    public void addAction(final View layout, final View summary) {

    summary.getViewTreeObserver().addOnPreDrawListener(
            new ViewTreeObserver.OnPreDrawListener() {

                @Override
                public boolean onPreDraw() {
                    summary.getViewTreeObserver().removeOnPreDrawListener(this);
                    summary.setVisibility(View.GONE);

                    final int widthSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
                    final int heightSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
                    summary.measure(widthSpec, heightSpec);

                    mAnimator = slideAnimator(0, summary.getMeasuredHeight(), summary);
                    return true;
                }
            });

    layout.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            if (summary.getVisibility() == View.GONE) {
                expand(summary);
            } else {
                collapse(summary);
            }
        }
    });
}

private void expand(View summary) {
    //set Visible
    summary.setVisibility(View.VISIBLE);

            /* Remove and used in preDrawListener
            final int widthSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
            final int heightSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
            mLinearLayout.measure(widthSpec, heightSpec);

            mAnimator = slideAnimator(0, mLinearLayout.getMeasuredHeight());
            */

    mAnimator.start();
}

private void collapse(final View summary) {
    int finalHeight = summary.getHeight();

    ValueAnimator mAnimator = slideAnimator(finalHeight, 0, summary);

    mAnimator.addListener(new Animator.AnimatorListener() {
        @Override
        public void onAnimationEnd(Animator animator) {
            //Height=0, but it set visibility to GONE
            summary.setVisibility(View.GONE);
        }

        @Override
        public void onAnimationStart(Animator animator) {
        }

        @Override
        public void onAnimationCancel(Animator animator) {
        }

        @Override
        public void onAnimationRepeat(Animator animator) {
        }
    });
    mAnimator.start();
}


private ValueAnimator slideAnimator(int start, int end, final View summary) {

    ValueAnimator animator = ValueAnimator.ofInt(start, end);


    animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator valueAnimator) {
            //Update Height
            int value = (Integer) valueAnimator.getAnimatedValue();

            ViewGroup.LayoutParams layoutParams = summary.getLayoutParams();
            layoutParams.height = value;
            summary.setLayoutParams(layoutParams);
        }
    });
    return animator;
}

问题：前 2 个布局只工作一次。第一次展开 -> 折叠后，onClickFunction 不起作用。第三种布局工作正常，我可以多次展开/折叠。有什么解决办法吗？

4

4 回答 4

17

我自己解决了，这是可扩展布局的工作解决方案。

利用：

addAction(YourLayout, LayoutToBeExpanded)

功能：

    public void addAction(final View layout, final View summary) {



    layout.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            if (summary.getVisibility() == View.GONE) {
                expand(summary);
            } else {
                collapse(summary);
            }
        }
    });
}

private void expand(View summary) {
    //set Visible
    summary.setVisibility(View.VISIBLE);

            final int widthSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
            summary.measure(widthSpec, 300);

            mAnimator = slideAnimator(0, 300, summary);

    mAnimator.start();
}

private void collapse(final View summary) {
    int finalHeight = summary.getHeight();

    ValueAnimator mAnimator = slideAnimator(finalHeight, 0, summary);

    mAnimator.addListener(new Animator.AnimatorListener() {
        @Override
        public void onAnimationEnd(Animator animator) {
            //Height=0, but it set visibility to GONE
            summary.setVisibility(View.GONE);
        }

        @Override
        public void onAnimationStart(Animator animator) {
        }

        @Override
        public void onAnimationCancel(Animator animator) {
        }

        @Override
        public void onAnimationRepeat(Animator animator) {
        }
    });
    mAnimator.start();
}


private ValueAnimator slideAnimator(int start, int end, final View summary) {

    ValueAnimator animator = ValueAnimator.ofInt(start, end);


    animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(ValueAnimator valueAnimator) {
            //Update Height
            int value = (Integer) valueAnimator.getAnimatedValue();

            ViewGroup.LayoutParams layoutParams = summary.getLayoutParams();
            layoutParams.height = value;
            summary.setLayoutParams(layoutParams);
        }
    });
    return animator;
}

如果您还想在单击时折叠“mLayoutToBeExpanded”，请使用：

    public void addAction(final View layout, final View summary) {
    layout.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (summary.getVisibility() == View.GONE) {
                expand(summary);
            } else {
                collapse(summary);
            }
        }
    });

    summary.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            if (summary.getVisibility() == View.VISIBLE) {
                collapse(summary);
            } else {
                //nothing
            }
        }
    });
}
于 2013-11-08T20:14:13.757 回答
2

使用此方法实现折叠和展开动画：

       public void expandOrCollapse(final View v,String exp_or_colpse) {
    TranslateAnimation anim = null;
    if(exp_or_colpse.equals("expand"))
    {
        anim = new TranslateAnimation(0.0f, 0.0f, -v.getHeight(), 0.0f);
        v.setVisibility(View.VISIBLE);  
    }
    else{
        anim = new TranslateAnimation(0.0f, 0.0f, 0.0f, -v.getHeight());
        AnimationListener collapselistener= new AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {
            }

            @Override
            public void onAnimationRepeat(Animation animation) {
            }

            @Override
            public void onAnimationEnd(Animation animation) {
            v.setVisibility(View.GONE);
            }
        };

        anim.setAnimationListener(collapselistener);
    }

     // To Collapse
        //

    anim.setDuration(300);
    anim.setInterpolator(new AccelerateInterpolator(0.5f));
    v.startAnimation(anim);
}

并在您的代码中调用此方法：

        //For Expand View
       expandOrCollapse(YourView,"expand");

      //For Collapse View
       expandOrCollapse(yourView,"collapse");
于 2014-05-29T12:04:56.600 回答
0

只是一种替代方案，易于使用。用动画扩展视图：

view.setPivotY(0);
ObjectAnimator.ofFloat(view, "scaleY", 0f, 1f).setDuration(300).start();
于 2016-06-02T12:31:47.107 回答
0 
    ValueAnimator expandAnimation = ValueAnimator.ofInt(mainView.getHeight(), 400);
    expandAnimation.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
        @Override
        public void onAnimationUpdate(final ValueAnimator animation) {
            int height = (Integer) animation.getAnimatedValue();
            RelativeLayout.LayoutParams lp = (LayoutParams) mainView.getLayoutParams();
            lp.height = height;
        }
    });


    expandAnimation.setDuration(500);
    expandAnimation.start();
于 2016-04-20T11:12:15.717 回答