Flutter踩坑记（Android篇）

1. mac 无法打开“idevice_id”。
解决办法：系统偏好设置-安全性与隐私-信任。

2. Could not find an option named "androidx"
AS 创建Flutter项目报上面错误信息，可能因为flutter sdk 版本过低。
FlutterSDK下载地址
https://flutter.dev/docs/development/tools/sdk/releases?tab=macos

3. Mac环境下Android Studio 无法连接iOS模拟器
在mac环境下用Android Studio 写Flutter，可以启动iOS 模拟器，但是在设备列表里找不到模拟器时
打开终端并输入下面命令：
sudo xcode-select --switch/Applications/Xcode.app/Contents/Developer
之后回车，输入本机密码，就可以了

4. Your app isn’t using AndroidX
android gradle.properties下添加

android.enableJetifier=true
android.useAndroidX=true

5. bottom overflowed by 94 pixels
Scaffold下添加如下配置：resizeToAvoidBottomInset: false
原因：防止软键盘弹出时遮挡页面的东西。当设置为 true 的时候，软键盘弹出页面会自动调整尺寸避免遮挡； 当为 false 的时候则软键盘弹出不会自动调整尺寸。该属性值默认为 true。

6. 启动黑屏
Flutter项目启动过程：
1、显示android启动项activity
2、flutter启动项activity
3、进入flutter项目的第一个页面
黑屏对应的是flutter启动项activity
解决方案：
AndroidManifest.xml中目标activity下加入

    <application
        android:name="io.flutter.app.FlutterApplication"
        android:label="swift_rabbit"
        android:icon="@mipmap/ic_launcher">
        <activity
            android:name=".MainActivity"
            android:launchMode="singleTop"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>

            <!--Flutter 闪屏页-->
            <meta-data
                android:name="io.flutter.embedding.android.SplashScreenDrawable"
                android:resource="@drawable/launch_background" />
            <!--闪屏页结束后的Theme-->
            <meta-data
                android:name="io.flutter.embedding.android.NormalTheme"
                android:resource="@style/NormalTheme" />
        </activity>

        <!-- Don't delete the meta-data below.
             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
    </application>

style.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
        <!-- Show a splash screen on the activity. Automatically removed when
             Flutter draws its first frame -->
        <item name="android:windowBackground">@drawable/launch_background</item>
    </style>
    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
        <item name="android:windowBackground">@drawable/normal_background</item>
    </style>
</resources>

normal_background.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Modify this file to customize your launch splash screen -->
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@android:color/white" />

    <!-- You can insert your own image assets here -->
    <item>
        <bitmap
            android:gravity="center"
            android:src="@mipmap/naruto" />
    </item>
</layer-list>

7. Flutter: Exception in thread “main” java.util.zip.ZipException:
error in opening zip file
修改android gradle版本build.gradle / gradle-wrapper.properties