淡入Android启动活动

Question

寻找帮助在我的发布活动中消失.我发现了许多关于在使用意图启动的活动之间淡出的帖子,但没有关于如何淡化你的启动活动的帖子.我尝试过,overridePendingTransition(int animationIn, int animationOut)但这对我没用.我把它放在onCreate(..)方法和onStart(..)方法中,但都没有成功.任何帮助或方向将不胜感激.

谢谢.

Answer 1

我为你做了一些事,但它排除了动作栏.我为一个简单的例子稍微修改了hello world演示:

1. 将半透明主题设置为您的启动器活动,我称之为Translucy:

   /res/values/style.xml

   <style name="Theme.Translucy" parent="android:style/Theme.Translucent">
       <item name="android:windowNoTitle">true</item>
       <item name="android:background">@android:color/transparent</item>
   </style>
   

   AndroidManifest.xml:

   <activity
       android:name=".MainActivity"
       android:theme="@style/Theme.Translucy"
       android:label="@string/app_name">
       <intent-filter>
           <action android:name="android.intent.action.MAIN" />
   
           <category android:name="android.intent.category.LAUNCHER" />
       </intent-filter>
   </activity>
   

2. 为您的主xml布局创建一个id,我称之为rlayout_main,并将其设置为不可见:

   <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:tools="http://schemas.android.com/tools"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:paddingLeft="@dimen/activity_horizontal_margin"
       android:paddingRight="@dimen/activity_horizontal_margin"
       android:paddingTop="@dimen/activity_vertical_margin"
       android:paddingBottom="@dimen/activity_vertical_margin"
   
       android:id="@+id/rlayout_main"
       android:visibility="invisible"
       android:background="@android:color/holo_blue_dark"
   
       tools:context=".MainActivity">
   
         <TextView
             android:textSize="50sp"
             android:text="@string/hello_world"
             android:layout_centerInParent="true"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content" />
   
   </RelativeLayout>
   

3. 创建AlphaAnimation并为主要父布局设置动画:

    public class MainActivity extends Activity {
   
        @Override
        protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
   
        RelativeLayout relativeLayoutMain = (RelativeLayout) findViewById(R.id.rlayout_main);
        AlphaAnimation alphaAnimation = new AlphaAnimation(0, 1);
        alphaAnimation.setDuration(3000);
        alphaAnimation.setFillAfter(true);
        relativeLayoutMain.startAnimation(alphaAnimation);
        }
    }
   

   (编辑):要保存一些代码,您还可以使用ViewPropertyAnimator为布局设置动画,而不是创建AlphaAnimation:

   public class MainActivity extends Activity {
   
       @Override
       protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
   
       RelativeLayout relativeLayoutMain = (RelativeLayout)  findViewById(R.id.rlayout_main);
       relativeLayoutMain.animate().alpha(1).setDuration(3000);
       }
   }
   

希望这有帮助,就像我说它不完美,因为它排除了ActionBar,但它可能是一个开始的东西.