标签：android style blog io ar color os 使用 sp
淡出淡入动画就是我们常说的渐隐动画，一个界面逐渐消失的时候另一个逐渐显现。当你需要在应用中切换两个视图的时候这个动画效果就显得非常实用了。 这个动画短小但很精致，巧妙的衔接了视图的切换。如果你不使用这种动画会让整个切换过程显得生硬且急促。
public class CrossfadeActivity extends Activity {
private View mContentView;
private View mLoadingView;
private int mShortAnimationDuration;
...
@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.
mShortAnimationDuration = getResources().getInteger(
android.R.integer.config_shortAnimTime);
}
private View mContentView;
private View mLoadingView;
private int mShortAnimationDuration;
...
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(mShortAnimationDuration)
.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);
}
});
}Android Crossfading animation 淡出淡入动画
标签：android style blog io ar color os 使用 sp
原文地址：http://blog.csdn.net/h3c4lenovo/article/details/41379387
