flutter安卓端热更新详细教程-附源码 超简单

flutter 安卓端热更新详细教程 附源码 一个类搞定

• flutter版本 stable 1.17.5

1. 新建文件夹HotFlutter , 在这目录下新建一个flutter项目:

flutter create HotFlutter 

因为flutter项目的安卓端默认用的是kt , 我比较熟悉java , 所以先删除项目下的android 文件夹, 重新生成java 的安卓代码

flutter create -a java . 

准备工作做完了!

2. 在android -> app -> src -> main-> java-> com.example.HotFlutter 下新建类MyFlutterActivity,如图:

3. MyFlutterActivity 类继承 FlutterActivity ,重写getFlutterShellArgs() 方法,将我们需要热更新的文件配置进去,有注释 , 直接贴代码:

package com.example.HotFlutter;

import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.engine.FlutterShellArgs;

public class MyFlutterActivity extends FlutterActivity {
    
    

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
    
        super.onCreate(savedInstanceState);
        //申请权限
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    
    
            if (ContextCompat.checkSelfPermission(MyFlutterActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
    
    
                ActivityCompat.requestPermissions(MyFlutterActivity.this, new String[]{
    
    Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
            }
            if (ContextCompat.checkSelfPermission(MyFlutterActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
    
    
                ActivityCompat.requestPermissions(MyFlutterActivity.this, new String[]{
    
    Manifest.permission.READ_EXTERNAL_STORAGE}, 1);
            }
        }
    }


    @Override
    public FlutterShellArgs getFlutterShellArgs() {
    
    
        copyLibAndWrite(this, "hotlibapp.so");
        FlutterShellArgs supFA = super.getFlutterShellArgs();
        File dir = this.getDir("libs", Activity.MODE_PRIVATE);
        String libPath = dir.getAbsolutePath() + File.separator + "hotlibapp.so";
        File libFile = new File(libPath);
        if (libFile.exists()) {
    
    
            supFA.add("--aot-shared-library-name=" + libPath);   //如果有hotlibapp文件 ,配置进去,没有则作用默认的
        }
        return supFA;
    }

    // 作用:  在手机根目录找 hotlibapp.so 文件 , 如果有则复制到 app libs 文件下, 没有则不做操作
    public static void copyLibAndWrite(Context context, String fileName) {
    
    
        try {
    
    
            String path = Environment.getExternalStorageDirectory().toString();
            File destFile2 = new File(path + "/" + fileName);
            if (destFile2.exists()) {
    
    
                File dir = context.getDir("libs", Activity.MODE_PRIVATE);
                File destFile = new File(dir.getAbsolutePath() + File.separator + fileName);
                if (destFile.exists()) {
    
    
                    destFile.delete();
                }
                destFile.createNewFile();
                FileInputStream is = new FileInputStream(destFile2);
                FileOutputStream fos = new FileOutputStream(destFile);
                byte[] buffer = new byte[is.available()];
                int byteCount;
                while ((byteCount = is.read(buffer)) != -1) {
    
    
                    fos.write(buffer, 0, byteCount);
                }
                fos.flush();
                is.close();
                fos.close();
                destFile2.delete();   //复制完后删除这个文件
            }
        } catch (IOException e) {
    
    
        }

    }
}

原模原样复制进去就行 , 建议用as 打开 , 避免导包出错,代码不用变

4. 打开MainActivity类 , 继承自己写的MyFlutterActivity类

package com.example.HotFlutter;
public class MainActivity extends MyFlutterActivity {
    
    
}

5. 在AndroidManifest中添加

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

并注册我们自己写的类

 <activity android:name=".MyFlutterActivity"></activity>

6. 为了展示效果 , 把main.dart 简化了一下 :

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
    
    
  @override
  Widget build(BuildContext context) {
    
    
    return MaterialApp(
      title: 'Flutter Demo',
      home: Scaffold(
        body: Center(child: Text("初始化项目")),
      ),
    );
  }
}

打包:

flutter build apk --target-platform android-arm  --split-per-abi

运行效果:
把 Text(“初始化项目”)改成Text(“热更新”), 重新打包一份,然后解压
将app-armeabi-v7a-release\lib\armeabi-v7a\libapp.so 重命名成 hotlibapp.so,放到手机根目录

重启app , 发现首页已经变成 热更新了! 目录下的文件也会被删除 , 重启之后也是用的新包
大功告成!!!

第一次 写文章 , 转载请注明出处.
附上github地址
https://gitee.com/yangruishan666/hot-flutter