android动画—alpha

ゞ浴缸里的玫瑰 2022-06-13 13:58 151阅读 0赞

我们可以通过alpha动画达到透明度变化的动画效果，它会在指定时间内进行透明度的变化，以下为效果对比图：

![Image 1][]![Center][]

以下为代码示例：

![Center 1][]

anim部分xml代码：

![Image 1][]

<?xml version="1.0" encoding="utf-8"?>
    <alpha xmlns:android="http://schemas.android.com/apk/res/android"
        android:fromAlpha="0"
        android:toAlpha="1.0"
        android:duration="2000"
        android:fillAfter="true"
        >
        
        
        
        
    </alpha>

Java部分：

public class YindaoActivity extends AppCompatActivity {
    
        private ImageView iv;
        private TextView tv1;
        private TextView tv2;
        private FrameLayout fl;
        private ImageView iv2;
        private Animation animation2;
        private Animation animation1;
        private Animation animation5;
        private Animation animation;
    
        @Override
        protected void onCreate(@Nullable Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_yindao);
            a();
            getHomeActivity();
        }
    }

Layout的xml部分代码：

<?xml version="1.0" encoding="utf-8"?>
    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical" android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/i1"
        android:id="@+id/ll"
        >
    
    
    
        <ImageView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:src="@drawable/ren1"
            android:alpha="0.9"
            android:id="@+id/iv"
            android:layout_marginTop="50dp"
            />
    
        <ImageView
            android:id="@+id/imageView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="0dp"
            android:layout_marginLeft="70dp"
            android:src="@drawable/i6" />
    
    </FrameLayout>

[Image 1]: 
[Center]: /images/20220613/3cd4915c631a470598b66a3acab03513.png
[Center 1]: /images/20220613/a24476ba0ce248629846ee6634207e9e.png