ObjectAnimator causes ImageView to disappear

问题

I'm working on animating an ImageView in Android (API 19), using ObjectAnimator. I've got everything working well, and it displays perfectly on a Galaxy S3, but on my Nexus 7 (2013 WiFi model) it's causing issues.

The goal is to have an image do a full 360° rotation around its Y-axis using rotateY. However, on the Nexus 7, between 75° and 105°, the image disappears. My drawable was created from a PNG, and the relevant code is below.

View:

<ImageView
    android:id="@+id/login_logo"
    android:layout_width="match_parent"
    android:layout_height="120dp"
    android:layout_marginTop="30dp"
    android:src="@drawable/mimo_logo"/>

Starting the animation:

ImageView image = (ImageView) findViewById(R.id.login_logo);
Animator anim = AnimatorInflater.loadAnimator(context, R.animator.flipping);
anim.setTarget(image);
anim.start();

And the animation itself:

<?xml version="1.0" encoding="utf-8"?>
<objectAnimator xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="3000"
    android:propertyName="rotationY"
    android:repeatCount="-1"
    android:valueFrom="0"
    android:valueTo="360" />

I'll work on getting a GIF of the actual issue, but does anyone have any thoughts why the Nexus 7 would be having issues?

EDIT: Here's what it looks like (recording using adb shell screenrecord):

回答1:

Try to use: image.setCameraDistance(float) method.

From documentation:

The camera's distance affects 3D transformations, for instance rotations around the X and Y axis. If the rotationX or rotationY properties are changed and this view is large (more than half the size of the screen), it is recommended to always use a camera distance that's greater than the height (X axis rotation) or the width (Y axis rotation) of this view.

If you want to specify a distance that leads to visually consistent results across various densities, use the following formula:

float scale = context.getResources().getDisplayMetrics().density;
 view.setCameraDistance(distance * scale);

来源：https://stackoverflow.com/questions/27474467/objectanimator-causes-imageview-to-disappear

标签

android

imageview

objectanimator