[Part 29 of the Flutter Problem Series] MainActivity cannot be converted to FlutterEngine, GeneratedPluginRegistrant.r

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This is the [29th article of the Flutter problem series]. If you find it useful, please pay attention to the column.

One: problem description

When using Flutter and Android mixed development, I need to get the current battery of the mobile phone. When the MainActivity class rewrites the onCreate method of the FlutterActivity class, I wrote it like this (irrelevant code has been omitted)

 @Override
 public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   GeneratedPluginRegistrant.registerWith(this);
}
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After the program starts, an error is reported, as shown in the following figure

It means that there is an incompatible type, MainActivity cannot be converted to FlutterEngine.

Two: Solutions

At this time, this refers to MainActivity, and what we need is FlutterEngine, so we can't directly pass this as a parameter to the method, we should instantiate a FlutterEngine, and then pass this in, as shown in the following code.

 @Override
 public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   GeneratedPluginRegistrant.registerWith(new FlutterEngine(this));
}
复制代码

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concluding remarks

Google's Flutter is getting more and more popular. As of July 11, 2021, the GitHub star has reached 124K. Flutter is resolutely a trend, so as a front-end developer, there is no reason not to learn as soon as possible.

Whether you are a Flutter novice or have already started, you might as well pay attention first. I will write about the common components in Flutter (including source code analysis, component usage and precautions) and possible problems in the rare earth nuggets blog. , I hope that while learning by myself, I can also help more people.