Question

我设法在10秒后使imageView消失（我的mainActivity上的教程图像）。但是我希望能够顺利淡出，因为这样看起来不太好，任何人都可以向我推荐任何好的教程

     img=(ImageView)findViewById(R.id.ImageTutorial);
    if(getIntent()!=null)
    {

        Bundle extras = getIntent().getExtras();
        String TutorialDemo=extras !=null? extras.getString("TutorialDemo"):"false";

        if(TutorialDemo.equals("true"))
        {
            Runnable mRunnable;
            Handler mHandler=new Handler();

            mRunnable=new Runnable() {

                        @Override
                        public void run() {

                            img.setVisibility(View.GONE); //This will remove the View. and free s the space occupied by the View    
                        }
                    };
                    mHandler.postDelayed(mRunnable,10*900);
        }
        else
        {
            img.setVisibility(View.GONE);
        }
         }

这是图像视图xml

  <?xml version="1.0" encoding="utf-8"?>
  <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
 android:layout_height="match_parent" 
 android:id="@+id/fullview"
>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="10dp"
    android:orientation="vertical" >

      .
      .
      .
      .

    <ImageView
        android:contentDescription="tutorial"
        android:id="@+id/ImageTutorial"
        android:layout_width="match_parent"
        android:layout_height="120dp"
        android:layout_alignParentBottom="true"
        android:background="@drawable/tutorial"
        android:layout_marginTop="40dp"
        android:gravity="center"
        />

</LinearLayout>

Answer 1

通过调用fadeOutAndHideImage（img）替换代码中的img.setVisibility（View.GONE），其定义如下：

  private void fadeOutAndHideImage(final ImageView img)
  {
    Animation fadeOut = new AlphaAnimation(1, 0);
    fadeOut.setInterpolator(new AccelerateInterpolator());
    fadeOut.setDuration(1000);

    fadeOut.setAnimationListener(new AnimationListener()
    {
            public void onAnimationEnd(Animation animation) 
            {
                  img.setVisibility(View.GONE);
            }
            public void onAnimationRepeat(Animation animation) {}
            public void onAnimationStart(Animation animation) {}
    });

    img.startAnimation(fadeOut);
}

首先应用淡出动画，然后隐藏图像视图。

Answer 2

从此代码段中获取提示。所需的代码是这样的 -

Animation fadeOut = new AlphaAnimation(1, 0);  // the 1, 0 here notifies that we want the opacity to go from opaque (1) to transparent (0)
fadeOut.setInterpolator(new AccelerateInterpolator());
fadeOut.setStartOffset(500); // Start fading out after 500 milli seconds
fadeOut.setDuration(1000); // Fadeout duration should be 1000 milli seconds

现在将其设置为元素，例如图像视图 -

myImageView.setAnimation(fadeOut);

在android中为imageview做出平滑的淡出

2 个答案: