1.啟動頁延時跳轉+沉浸狀態列+啟動頁圖片全屏

public class SplashActivity extends AppCompatActivity {
    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

/*沉浸狀態列，即使狀態列顏色透明*/

       /* View decorView = getWindow().getDecorView();
        decorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
        getWindow().setStatusBarColor(Color.TRANSPARENT);*/

/**************************************/

 //去除標題欄  
     //  requestWindowFeature(Window.FEATURE_NO_TITLE);  
        //去掉Activity上面的狀態列
       getWindow().setFlags(WindowManager.LayoutParams. FLAG_FULLSCREEN ,  
                      WindowManager.LayoutParams. FLAG_FULLSCREEN);  

/**************************************/

        setContentView(R.layout.activity_splash);

//延時2秒跳轉MainActivity
        new Handler().postDelayed(new Runnable() {
            public void run() {
                Intent intent = new Intent(SplashActivity.this, MainActivity.class);
                startActivity(intent);
            }
        }, 2000);   //2秒
    }
}
 

activity_splash.xml: (主要程式碼是android:scaleType="fitXY"，x軸，y軸分別拉伸圖片)

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
    <ImageView
        android:id="@+id/splash_bg_img"
        android:src="@mipmap/splash"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="fitXY"
        />
</RelativeLayout>
 

 2.解決啟動白屏問題：

再values/color中新增#90FFFFFF透明色

<color name="transparent">#90FFFFFF</color>

在style中新增主題

</style>
    <style name="AppTransparentTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:windowBackground">@android:color/transparent</item>
    </style>

在Androidmainfest.xml設定：

<activity android:name=".SplashActivity" android:theme="@style/AppTransparentTheme">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />

        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>