Question

我正在使用Flutter创建一个新应用，并希望在初始启动屏幕上添加自定义图像。

该图像出现在初始屏幕上，但是大约半秒钟，它似乎被拉伸了，效果不太好。

我一直在搜索，但是一直很难找到遇到相同问题的任何人。

有什么想法吗？

我尝试使用mipmap给出可变大小的图像，但产生相同的结果。

launch_background.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@color/green" />
    <item>
        <bitmap
            android:gravity="center_horizontal"
            android:src="@drawable/ic_logo"
            android:tileMode="disabled"/>
    </item>
</layer-list>

style.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
        <item name="android:windowBackground">@drawable/launch_background</item>
        <item name="android:windowFullscreen">false</item>
    </style>
    <color name="green">#b7dd05</color>
</resources>

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.flutter_app">

    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
         calls FlutterMain.startInitialization(this); in its onCreate method.
         In most cases you can leave this as-is, but you if you want to provide
         additional functionality it is fine to subclass or reimplement
         FlutterApplication and put your custom class here. -->
    <application
        android:name="io.flutter.app.FlutterApplication"
        android:label="flutter_app"
        android:icon="@mipmap/ic_launcher">
        <activity
            android:name=".MainActivity"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize"
            android:screenOrientation="portrait">
            <!-- This keeps the window background of the activity showing
                 until Flutter renders its first frame. It can be removed if
                 there is no splash screen (such as the default splash screen
                 defined in @style/LaunchTheme). -->
            <meta-data
                android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
                android:value="true" />
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>
</manifest>

我不介意图像花费一秒钟的渲染时间，但是先拉伸它并不理想。

Answer 1

您需要提供具有所有可能尺寸（mdpi，hdpi，xhdpi等）的图像，以使每种屏幕尺寸都具有正确的尺寸，并使用以下可绘制对象：

<?xml version="1.0" encoding="utf-8" ?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle">
            <solid android:color="@android:color/holo_green_dark" />
            <padding
                android:left="0dp"
                android:top="0dp"
                android:right="0dp"
                android:bottom="0dp" />
        </shape>
    </item>
    <item
        android:gravity="center"
        android:drawable="@drawable/logo_splash">
    </item>
</layer-list>

这将是我的风格：

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

    <style name="SplashScreen" parent="AppTheme">
        <item name="android:windowBackground">@drawable/splash</item>
        <item name="android:windowFullscreen">false</item>
    </style>

</resources>

最终，这将是我的AndroidManifest.xml：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.example.marianozorrilla">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        tools:ignore="GoogleAppIndexingWarning">

        <activity
            android:name=".MainActivity"
            android:theme="@style/SplashScreen">
            <intent-filter>
                <category android:name="android.intent.category.LAUNCHER" />
                <action android:name="android.intent.action.MAIN" />
            </intent-filter>
        </activity>

    </application>

</manifest>

所有这些的结果如下：

就我而言，logo_splash.png的大小为 200px-200px 。如果您真的想在 DP 中处理大小，则需要至少具有 API 23 ：

<?xml version="1.0" encoding="utf-8" ?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle">
            <solid android:color="@android:color/holo_green_dark" />
            <padding
                android:left="0dp"
                android:top="0dp"
                android:right="0dp"
                android:bottom="0dp" />
        </shape>
    </item>
    <item
        android:gravity="center"
        android:drawable="@drawable/logo_splash"
        android:width="100dp"
        android:height="100dp">
    </item>
</layer-list>

这看起来像这样：

Flutter初始屏幕在加载时可拉伸图像一秒钟

1 个答案: