flutter 升级到 1.12.x android 启动时会黑屏解决办法

  1. 直接用flutter 1.12.x SDK创建的项目

    需要修改AndroidManifest.xml文件，修改如下：

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    <application
            android:name="io.flutter.app.FlutterApplication"
            android:label="ifeiyv"
            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">
                  //
                <meta-data
                    android:name="io.flutter.embedding.android.SplashScreenDrawable"
                    android:resource="@drawable/launch_background"
                    />
                <meta-data
                    android:name="io.flutter.embedding.android.NormalTheme"
                    android:resource="@drawable/launch_background"
                    />
                <intent-filter>
                    <action android:name="android.intent.action.MAIN"/>
                    <category android:name="android.intent.category.LAUNCHER"/>
                </intent-filter>
            </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>

    如果存在meta-data 的 android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"，删除此meta-data，添加如下代码：

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    <meta-data
         android:name="io.flutter.embedding.android.SplashScreenDrawable"
         android:resource="@drawable/launch_background"
     />
     <meta-data
         android:name="io.flutter.embedding.android.NormalTheme"
         android:resource="@drawable/launch_background"
      />

    修改launch_background.xml，这个要根据需求添加开屏视图

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    <?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:left="0dp"
             android:top="0dp"
             android:bottom="0dp"
             android:right="0dp"
            android:drawable="@drawable/pic_bg" />
        <!-- You can insert your own image assets here -->  
    </layer-list>

    在<application>标签下添加新的 <meta-data> ,一旦您在AndroidManifest中进行了声明并使用了插件，能够使用使用了新的Android的插件（将插件注册为，FlutterEngine而不是PluginRegistry.Registrar

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    < meta-data 
        android ：name = “flutterEmbedding”
        android ：value = “2” />

  1. 如果是低版本创建的项目升级,除了以上修改外还需要修改以下内容：

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    //FlutterActivity包路径修改
    //把
    import io.flutter.app.FlutterActivity;
    //修改为
    import io.flutter.embedding.android.FlutterActivity;

以前 

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import io.flutter.app.FlutterActivity;
import io.flutter.plugins.GeneratedPluginRegistrant;

public class MainActivity extends FlutterActivity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    GeneratedPluginRegistrant.registerWith(this);
  }

  // ...some amount of custom code for your app is here.
}

现在

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import androidx.annotation.NonNull;
import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.plugins.GeneratedPluginRegistrant;

public class MainActivity extends FlutterActivity {
  @Override
  public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
    GeneratedPluginRegistrant.registerWith(flutterEngine);
  }
}
  1. 这里仅有修复黑屏的问题，更多升级详细信息请前往 官方升级指南 -》 前往