动画问题

Question

我对Interpolator有些麻烦......     我试图制作fadeIN / OUT但这个功能不起作用。我设置了延迟1000毫秒，但没有显示淡入淡出效果。你能救我吗？我检查了一些教程，除了布局宽度/高度之外，所有都应该正确设置，不应该用XML表示。当我删除它们时，会显示这些字段是必填字段的消息：（

XMLs:
FADEIN
<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/accelerate_interpolator"
    android:duration="1000"
    android:fromAlpha="0.0"
    android:toAlpha="1.0"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    />

---------------------

FADEOUT
<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:interpolator="@android:anim/decelerate_interpolator"
    android:duration="1000"
    android:fromAlpha="1.0"
    android:toAlpha="0.0">

</alpha>

---------
Main Activity
public class WelcomePage extends Activity {

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

        new Handler().postDelayed(new Thread(){  
            public void run(){
                Intent mainMenu = new Intent(WelcomePage.this,mainMenu.class);
                WelcomePage.this.startActivity(mainMenu); 
                WelcomePage.this.finish(); 
                overridePendingTransition(R.layout.fadein,R.layout.fadeout); 
            }

        },GCEngine.GAME_THREAD_DELAY);

    }

}

Answer 1

将此设置为fade_out：

android:fillAfter="true"

使用此代码：

new Handler().postDelayed(new Thread(){  
        public void run(){
            Intent mainMenu = new Intent(WelcomePage.this,mainMenu.class);
            WelcomePage.this.startActivity(mainMenu); 
            overridePendingTransition(R.layout.fadein,R.layout.fadeout); 
            WelcomePage.this.finish(); 
        }

},GCEngine.GAME_THREAD_DELAY);