什麼是檢索並緩存系統的默認「短」動畫時間？

我想做一個交叉淡入淡出，Android開發者教程使用「animationDuration」作爲動畫的持續時間。是否應該檢索「animationDuration」，以便根據處理器的速度確定淡入淡出動畫的持續時間？我對android編程很陌生，所以這樣簡單的事情對我來說還是很陌生。什麼是檢索並緩存系統的默認「短」動畫時間？

下面的代碼：

公共類CrossfadeActivity延伸活動{

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); 
}

這裏的動畫類：

私人無效交叉淡入淡出（）{

// 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); 
      } 
     });

}

來源

2014-02-13 user3306652

使用android.R.integer.config_shortAnimTimeconstant。

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

還有availbale config_longAnimTime，config_mediumAnimTime常數。

來源

2016-05-23 14:24:03

什麼是檢索並緩存系統的默認「短」動畫時間？

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