termux-x11/starter/src/main/java/com/termux/x11/starter/IActivityManager.java

package com.termux.x11.starter;

import android.annotation.SuppressLint;
import android.app.PendingIntent;
import android.content.ComponentName;
import android.content.IIntentReceiver;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.IBinder;

import java.lang.reflect.InvocationTargetException;

/**
 * Wrapper around android.app.IActivityManager internal interface
 */
@SuppressLint("PrivateApi")
class IActivityManager {

    private Object mAm;
    private CrossVersionReflectedMethod mGetProviderMimeType;
    private CrossVersionReflectedMethod mStartActivity;
    /*
    private CrossVersionReflectedMethod mBroadcastIntent;
    */
    private CrossVersionReflectedMethod mStartServiceMethod;
    private CrossVersionReflectedMethod mStopServiceMethod;
    private CrossVersionReflectedMethod mGetIntentSenderMethod;
    private CrossVersionReflectedMethod mIntentSenderSendMethod;

    IActivityManager() throws Exception {
        this("com.termux");
    }

    IActivityManager(String callingAppName) throws Exception {
        try {
            try {
                mAm = android.app.ActivityManager.class
                        .getMethod("getService")
                        .invoke(null);
            } catch (Exception e) {
                mAm = Class.forName("android.app.ActivityManagerNative")
                        .getMethod("getDefault")
                        .invoke(null);
            }
            Class<?> amClass = mAm.getClass();
            mGetProviderMimeType =
                    new CrossVersionReflectedMethod(amClass)
                            .tryMethodVariantInexact(
                                    "getProviderMimeType",
                                    Uri.class, "uri",
                                    int.class, "userId"
                            );
            mStartActivity =
                    new CrossVersionReflectedMethod(amClass)
                    .tryMethodVariantInexact(
                            "startActivityAsUser",
                            "android.app.IApplicationThread",  "caller", null,
                            String.class, "callingPackage", callingAppName,
                            Intent.class, "intent", null,
                            String.class, "resolvedType", null,
                            IBinder.class, "resultTo", null,
                            String.class, "resultWho", null,
                            int.class, "requestCode", -1,
                            int.class, "flags", 0,
                            //ProfilerInfo profilerInfo, - let's autodetect
                            Bundle.class, "options", null,
                            int.class, "userId", 0
                    );
            /*
            mBroadcastIntent =
                    new CrossVersionReflectedMethod(amClass)
                    .tryMethodVariantInexact(
                            "broadcastIntent",
                            "android.app.IApplicationThread", "caller", null,
                            Intent.class, "intent", null,
                            String.class, "resolvedType", null,
                            IIntentReceiver.class, "resultTo", null,
                            int.class, "resultCode", -1,
                            String.class, "resultData", null,
                            Bundle.class, "map", null,
                            String[].class, "requiredPermissions", null,
                            int.class, "appOp", 0,
                            Bundle.class, "options", null,
                            boolean.class, "serialized", false,
                            boolean.class, "sticky", false,
                            int.class, "userId", 0
                    );
            */
            mStartServiceMethod =
                    new CrossVersionReflectedMethod(amClass)
                    .tryMethodVariantInexact(
                            "startService",
                            "android.app.IApplicationThread", "caller", null,
                            Intent.class, "service", null,
                            String.class, "resolvedType", null,
                            boolean.class, "requireForeground", false,
                            String.class, "callingPackage", callingAppName,
                            int.class, "userId", 0
                    ).tryMethodVariantInexact(
                            "startService",
                            "android.app.IApplicationThread", "caller", null,
                            Intent.class, "service", null,
                            String.class, "resolvedType", null,
                            String.class, "callingPackage", callingAppName,
                            int.class, "userId", 0
                    ).tryMethodVariantInexact( // Pre frameworks/base 99b6043
                            "startService",
                            "android.app.IApplicationThread", "caller", null,
                            Intent.class, "service", null,
                            String.class, "resolvedType", null,
                            int.class, "userId", 0
                    );
            mStopServiceMethod =
                    new CrossVersionReflectedMethod(amClass)
                            .tryMethodVariantInexact(
                                    "stopService",
                                    "android.app.IApplicationThread", "caller", null,
                                    Intent.class, "service", null,
                                    String.class, "resolvedType", null,
                                    int.class, "userId", 0
                            );
            mGetIntentSenderMethod =
                    new CrossVersionReflectedMethod(amClass)
                    .tryMethodVariantInexact(
                            "getIntentSender",
                            int.class, "type", 0,
                            String.class, "packageName", callingAppName,
                            IBinder.class, "token", null,
                            String.class, "resultWho", null,
                            int.class, "requestCode", 0,
                            Intent[].class, "intents", null,
                            String[].class, "resolvedTypes", null,
                            int.class, "flags", 0,
                            Bundle.class, "options", null,
                            int.class, "userId", 0
                    );
            mIntentSenderSendMethod =
                    new CrossVersionReflectedMethod(Class.forName("android.content.IIntentSender"))
                    .tryMethodVariantInexact(
                            "send",
                            int.class, "code", 0,
                            Intent.class, "intent", null,
                            String.class, "resolvedType", null,
                            //IBinder.class, "android.os.IBinder whitelistToken", null,
                            "android.content.IIntentReceiver", "finishedReceiver", null,
                            String.class, "requiredPermission", null,
                            Bundle.class, "options", null
                    ).tryMethodVariantInexact( // Pre frameworks/base a750a63
                            "send",
                            int.class, "code", 0,
                            Intent.class, "intent", null,
                            String.class, "resolvedType", null,
                            "android.content.IIntentReceiver", "finishedReceiver", null,
                            String.class, "requiredPermission", null
                    );


        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    int startActivityAsUser(Intent intent, String resolvedType, int flags, Bundle options, int userId) throws InvocationTargetException {
        return (Integer) mStartActivity.invoke(
                mAm,
                "intent", intent,
                "resolvedType", resolvedType,
                "flags", flags,
                "options", options,
                "userId", userId
        );
    }

    void broadcastIntent(Intent intent, IIntentReceiver resultTo, String[] requiredPermissions, boolean serialized, boolean sticky, int userId) throws InvocationTargetException {
        /*
        mBroadcastIntent.invoke(
                mAm,
                "intent", intent,
                "resultTo", resultTo,
                "requiredPermissions", requiredPermissions,
                "serialized", serialized,
                "sticky", sticky,
                "userId", userId
        );
        */
        Object pendingIntent = mGetIntentSenderMethod.invoke(
                mAm,
                "type", 1 /*ActivityManager.INTENT_SENDER_BROADCAST*/,
                "intents", new Intent[] { intent },
                "flags", PendingIntent.FLAG_CANCEL_CURRENT | PendingIntent.FLAG_ONE_SHOT,
                "userId", userId
        );
        mIntentSenderSendMethod.invoke(
                pendingIntent,
                "requiredPermission", (requiredPermissions == null || requiredPermissions.length == 0) ? null : requiredPermissions[0],
                "finishedReceiver", resultTo
        );
    }

    String getProviderMimeType(Uri uri, int userId) throws InvocationTargetException {
        return (String) mGetProviderMimeType.invoke(
                mAm,
                "uri", uri,
                "userId", userId
        );
    }

    ComponentName startService(Intent service, String resolvedType, int userId) throws InvocationTargetException {
        return (ComponentName) mStartServiceMethod.invoke(
                mAm,
                "service", service,
                "resolvedType", resolvedType,
                "userId", userId
        );
    }

    int stopService(Intent service, String resolvedType, int userId) throws InvocationTargetException {
        return (Integer) mStopServiceMethod.invoke(
                mAm,
                "service", service,
                "resolvedType", resolvedType,
                "userId", userId
        );
    }
}