问题
I have an app that is launched by clicking a link in a webpage.
No problem, that works fine.
However, the app main screen just sort of bumps away the browser. I'd like to add a little animation. Maybe it can fade-in or something. I have done tween animations on ImageView but not sure how to do it for the full layout screen. Any ideas?
回答1:
i think you can simply use the AlphaAnimation , and apply it to the layout of your Activity like this , in the onCreate method :
super.onCreate(savedInstace);
this.setContentView(R.layout.main);
LinearLayout layout = (LinearLayout) findViewById(R.id.idLayout);
AlphaAnimation animation = new AlphaAnimation(0.0f , 1.0f ) ;
animation.setFillAfter(true);
animation.setDuration(1200);
//apply the animation ( fade In ) to your LAyout
layout.startAnimation(animation);
回答2:
This code comes from one of my projects. Feel free to use it in yours. Your activity should extend it, and do as described in HOWTO.
/**
* FadedActivity is a subclass of Activity. The difference with a
* standard activity is the fade in/out animation launched when
* the activity begins/ends.
*
* <p>
* HOWTO:
* <ul>
* <li>layout's main layer must have android:id="root"
* <li>derived class must call FadedActivity's super.onCreate() instead of Activity's
* <li>use finishFade() instead of finish()
* </ul>
*
* @author Joel
* @version 1.0
* @since 1.0
*/
public static class FadedActivity extends Activity {
private static final int FADEIN_DELAY_MS = 1000;
private static final int FADEOUT_DELAY_MS = 500;
private View root;
private void runFadeAnimationOn(Activity ctx, View target, boolean in, int delay) {
int start, finish;
if (in) {
start = 0;
finish = 1;
} else {
start = 1;
finish = 0;
}
AlphaAnimation fade = new AlphaAnimation(start, finish);
fade.setDuration(delay);
fade.setFillAfter(true);
target.startAnimation(fade);
}
public void onCreate(Bundle savedInstanceState, int layoutId) {
super.onCreate(savedInstanceState);
setContentView(layoutId);
root = (View)findViewById(R.id.root);
runFadeAnimationOn(this, root, true, FADEIN_DELAY_MS);
}
public void finishFade() {
final int delay = FADEOUT_DELAY_MS;
runFadeAnimationOn(this, root, false, delay);
new Thread(new Runnable() {
@Override
public void run() {
try {
Thread.sleep(delay);
} catch (InterruptedException e) {
e.printStackTrace();
}
FadedActivity.super.finish();
}
}).start();
}
}
来源:https://stackoverflow.com/questions/6101578/android-start-the-app-with-animation