Question

我正在尝试进行交叉淡入淡出，Android开发者的教程使用“animationDuration” 作为动画的持续时间。应该检索这个“animationDuration”，以便衰落动画的持续时间根据处理器的速度而定吗？我是android编程的新手，所以我这个简单的东西对我来说还是很陌生。

以下是代码：

公共类CrossfadeActivity扩展了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：

private void crossfade（）{

// 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);
            }
        });

}

Answer 1

使用android.R.integer.config_shortAnimTime constant。

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

还有config_longAnimTime，config_mediumAnimTime常量。

什么是检索和缓存系统的默认＆＃34;短＆＃34;动画时间？

1 个答案: