1

我正在尝试进行淡入淡出，Android Developers 上的教程使用“animationDuration”作为动画的持续时间。是否应该检索这个“animationDuration”，以便褪色动画的持续时间取决于处理器的速度？我是android编程的新手，所以像这样简单的事情对我来说仍然很陌生。

这是代码：

公共类 CrossfadeActivity 扩展 Activity {

private View mContentView;
private View mLoadingView;
private int AnimationDuration;

...

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_crossfade);

    mContentView = findViewById(R.id.content);
    mLoadingView = findViewById(R.id.loading_spinner);

    // Initially hide the content view.
    mContentView.setVisibility(View.GONE);

    // Retrieve and cache the system's default "short" animation time.
    AnimationDuration = getResources().getInteger(
            android.R.integer.config_shortAnimTime);
}

这是动画类：

私人无效交叉淡入淡出（）{

// Set the content view to 0% opacity but visible, so that it is visible
// (but fully transparent) during the animation.
mContentView.setAlpha(0f);
mContentView.setVisibility(View.VISIBLE);

// Animate the content view to 100% opacity, and clear any animation
// listener set on the view.
mContentView.animate()
        .alpha(1f)
        .setDuration(AnimationDuration)
        .setListener(null);

// Animate the loading view to 0% opacity. After the animation ends,
// set its visibility to GONE as an optimization step (it won't
// participate in layout passes, etc.)
mLoadingView.animate()
        .alpha(0f)
        .setDuration(mShortAnimationDuration)   //???
        .setListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                mLoadingView.setVisibility(View.GONE);
            }
        });

}

4

1 回答 1

0

使用android.R.integer.config_shortAnimTime 常量。

int time = getResources().getInteger(android.R.integer.config_shortAnimTime);

还有availbale config_longAnimTime，config_mediumAnimTime常量。

于 2016-05-23T14:24:03.107 回答