如何为Android上的图像按钮设置setVisibility动画？

Question

我有一个包含listview和imagebutton的布局:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:paddingTop="4px"
    android:background="@color/bgColor">

    <ImageButton
    android:id="@+id/imageButton"
    android:src="@drawable/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginRight="0dp"
    android:layout_alignParentBottom="true"/>

    <ListView
    android:layout_above="@+id/imageButton" 
    android:id="@android:id/list"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:drawSelectorOnTop="false"
    android:background = "@drawable/list_bg"
    android:divider="@drawable/grade"
    android:dividerHeight ="1px"
    android:cacheColorHint="#00000000"
    android:fastScrollEnabled= "true"
    android:scrollingCache ="true"
    android:smoothScrollbar="false"
    >
   </ListView>
</RelativeLayout>

根据用户选择我使用它来隐藏或显示图像按钮:

       ImageButton myButton = (ImageButton) findViewById(R.id.imageButton);
        myButton.setVisibility(View.GONE);

代码工作正常,但我想设置hide/show进程的动画.我该如何达到这个效果？

Answer 1

您可以使用系统动画淡入和淡出.

 Animation animFadeOut = AnimationUtils.loadAnimation(getApplicationContext(), android.R.anim.fade_out);
 Animation animFadeIn = AnimationUtils.loadAnimation(getApplicationContext(), android.R.anim.fade_in);
myButton.setAnimation(animFadeOut)
//if necessary then call:
myButton.setVisibility(View.GONE);

应该工作

如果你想制作自己的动画: 看看Android Res ,这是一个非常好的动画教程.

Answer 2

要显示按钮,请调用此方法

AlphaAnimation fade_in = new AlphaAnimation(0.0f, 1.0f);
fade_in.setDuration(500);
fade_in.setAnimationListener(new AnimationListener()
{
    public void onAnimationStart(Animation arg0)
    {
    }
    public void onAnimationRepeat(Animation arg0)
    {
    }

    public void onAnimationEnd(Animation arg0)
    {
        myButton.setVisibility(View.VISIBLE);
    }
});
myButton.startAnimation(fade_in);

然后隐藏按钮:

AlphaAnimation fade_out = new AlphaAnimation(1.0f, 0.0f);
fade_out.setDuration(upcoming_animation_time);
fade_out.setAnimationListener(new AnimationListener()
{
    public void onAnimationStart(Animation arg0)
    {
    }
    public void onAnimationRepeat(Animation arg0)
    {
    }

    public void onAnimationEnd(Animation arg0)
    {
        myButton.setVisibility(View.GONE);
    }
});
myButton.startAnimation(fade_out);

Answer 3

是编写自己的动画侦听器并将其设置为动画,如下所示:

public class MyAnimationListener implements AnimationListener {
    private ImageButton mImgButton;

    public MyAnimationListener(ImageButton imgButton) {
        mImgButton = imgButton;
    }

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

    }

    @Override
    public void onAnimationRepeat(Animation animation) {
        // TODO Auto - generated method stub

    }

    @Override
    public void onAnimationStart(Animation animation) {
        // TODO Auto - generated method stub

    }

}

然后将其设置为动画:

animation.setAnimationListener(new MyAnimationListener(myButton);

而已.