flutter create HotFlutter
因為flutter專案的安卓端預設用的是kt , 我比較熟悉java , 所以先刪除專案下的android 資料夾, 重新生成java 的安卓程式碼
flutter create -a java .
準備工作做完了!
在android -> app -> src -> main-> java-> com.example.HotFlutter 下新建類MyFlutterActivity,如圖:
MyFlutterActivity 類繼承 FlutterActivity ,重寫getFlutterShellArgs() 方法,將我們需要熱更新的檔案設定進去,有註釋 , 直接貼程式碼:
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);
//申請許可權
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檔案 ,設定進去,沒有則作用預設的
}
return supFA;
}
// 作用: 在手機根目錄找 hotlibapp.so 檔案 , 如果有則複製到 app libs 檔案下, 沒有則不做操作
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(); //複製完後刪除這個檔案
}
} catch (IOException e) {
}
}
}
原模原樣複製進去就行 , 建議用as 開啟 , 避免導包出錯,程式碼不用變
package com.example.HotFlutter;
public class MainActivity extends MyFlutterActivity {
}
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
並註冊我們自己寫的類
<activity android:name=".MyFlutterActivity"></activity>
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("初始化專案")),
),
);
}
}
打包:
flutter build apk --target-platform android-arm --split-per-abi
執行效果:
把 Text(「初始化專案」)改成Text(「熱更新」), 重新打包一份,然後解壓
將app-armeabi-v7a-release\lib\armeabi-v7a\libapp.so 重新命名成 hotlibapp.so,放到手機根目錄
重新啟動app , 發現首頁已經變成 熱更新了! 目錄下的檔案也會被刪除 , 重新啟動之後也是用的新包
大功告成!!!
第一次 寫文章 , 轉載請註明出處.
附上github地址
https://gitee.com/yangruishan666/hot-flutter