[移动开发]flutter热更新安卓端详细教程-附源码-超简单，android开发文档英文

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 .

![](https://upload-images.jianshu.io/upload_images/24099992-f4eedeb

《Android学习笔记总结+最新移动架构视频+大厂安卓面试真题+项目实战源码讲义》

开源分享完整内容戳这里

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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

并注册我们自己写的类

6. 为了展示效果 , 把main.dart 简化了一下 :
   中…(img-s0WYwU7X-1637310784731)]

6. 为了展示效果 , 把main.dart 简化了一下 :