Java 我可以使用易访问性服务（android）从主屏幕接收信息吗？

首先，如果我没有按照这里的规则正确书写，我想道歉，我是个新手。 我需要一些帮助。 我正在尝试为我的项目构建一个应用程序，我正在尝试先做基本的工作。 我需要从用户与他的手机的交互中获取一些参数，我需要在用户退出应用程序时（在主屏幕中）实现这一点。 我一直在寻找方法，发现无障碍服务应该是有效的（我希望我没有错）。我创建了一个应用程序，但它不工作，什么也没发生。我在网上到处找，什么也找不到。这是我的密码：

package com.example.AccessibilityService;

import android.accessibilityservice.AccessibilityService;
import android.accessibilityservice.FingerprintGestureController;

import android.os.Build;

import android.util.Log;
import android.view.accessibility.AccessibilityEvent;
import android.widget.Toast;

import androidx.annotation.RequiresApi;

public class MyAccessibilityService extends AccessibilityService {

    private FingerprintGestureController gestureController;
    private FingerprintGestureController
            .FingerprintGestureCallback fingerprintGestureCallback;
    private boolean mIsGestureDetectionAvailable;
    @RequiresApi(api = Build.VERSION_CODES.O)
    @Override
    public void onAccessibilityEvent(AccessibilityEvent event) {
        if (fingerprintGestureCallback != null
                || !mIsGestureDetectionAvailable) {
            return;
        }

        fingerprintGestureCallback =
                new FingerprintGestureController.FingerprintGestureCallback() {
                    @Override
                    public void onGestureDetected(int gesture) {
                        switch (gesture) {
                            case GESTURE_SWIPE_DOWN:
                                Toast.makeText(MyAccessibilityService.this,"swipe down occurred",Toast.LENGTH_LONG).show();
                                break;
                            case GESTURE_SWIPE_LEFT:
                                Toast.makeText(MyAccessibilityService.this,"swipe left occurred",Toast.LENGTH_LONG).show();
                                break;
                            case GESTURE_SWIPE_RIGHT:
                                Toast.makeText(MyAccessibilityService.this,"swipe right occurred",Toast.LENGTH_LONG).show();
                                break;
                            case GESTURE_SWIPE_UP:
                                Toast.makeText(MyAccessibilityService.this,"swipe up occurred",Toast.LENGTH_LONG).show();
                                break;
                            default:

                                break;
                        }
                    }

                    @Override
                    public void onGestureDetectionAvailabilityChanged(boolean available) {
                        mIsGestureDetectionAvailable = available;
                    }
                };

        if (fingerprintGestureCallback != null) {
            gestureController.registerFingerprintGestureCallback(
                    fingerprintGestureCallback, null);
        }
    }

    @RequiresApi(api = Build.VERSION_CODES.O)
    @Override
    public void onCreate() {
        gestureController = getFingerprintGestureController();
        mIsGestureDetectionAvailable =
                gestureController.isGestureDetectionAvailable();
        if(mIsGestureDetectionAvailable == true)
            Toast.makeText(MyAccessibilityService.this,"working",Toast.LENGTH_LONG).show();
        else
         Toast.makeText(MyAccessibilityService.this,"Not working",Toast.LENGTH_LONG).show();
    }

    @Override
    public void onInterrupt() {

    }

    @RequiresApi(api = Build.VERSION_CODES.O)
    @Override
    protected void onServiceConnected() {
       Log.d("MY_APP_TAG", "hi1234124");
    }
}

清单文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.AccessibilityService">
    <uses-permission android:name="android.permission.USE_FINGERPRINT"></uses-permission>
    <application
        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>


    </activity>
        <service
            android:name=".MyAccessibilityService"
            android:enabled="true"
            android:exported="true"
            android:label="My application"
            android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE">
            <intent-filter>
                <action android:name="android.accessibilityservice.AccessibilityService" />
            </intent-filter>

            <meta-data
                android:name="android.accessibility"
                android:resource="@layout/service_config" />
        </service>
    </application>

</manifest>

---

大家好，欢迎来到SO。我们需要更多的信息来帮助你。应用程序是否会进入黑屏？它会崩溃吗？谢谢你的欢迎：-）它不会崩溃，也不会出现在黑屏上。我有一个main（它是项目创建时的基本main，我没有在这里发布）。您还需要其他相关信息吗？感谢您的回复：-）代码中没有显示，但在我的代码中显示我授予的“使用指纹”权限已被否决。此问题包含太多信息。尝试并创建一个最小的可复制示例，如下所述

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <accessibility-service
        android:accessibilityEventTypes="typeAllMask"
        android:accessibilityFeedbackType="feedbackAllMask"
        android:accessibilityFlags="flagDefault"
        android:canRequestEnhancedWebAccessibility="true"
        android:canRequestTouchExplorationMode="true"
        android:canRetrieveWindowContent="true"
        android:notificationTimeout="100"
        android:packageNames="@null"

        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

11/14/2020
9:15 PM * daemon not running; starting now at tcp:5037

9:15 PM * daemon started successfully

9:16 PM Gradle sync started

9:16 PM Gradle sync finished in 7 s 808 ms (from cached state)

9:16 PM Android Studio 4.1.1 available
                Update...

9:17 PM Executing tasks: [:app:assembleDebug] in project C:\Users\rami\AndroidStudioProjects\AccessibilityService

9:18 PM Gradle build finished in 1 m 10 s 421 ms

9:19 PM Install successfully finished in 17 s 624 ms.

9:19 PM Emulator: [6172:6468:1114/211932.545:ERROR:block_files.cc(111)] Failing CreateMapBlock

9:19 PM Emulator: [6172:6468:1114/211932.545:ERROR:entry_impl.cc(985)] Failed to save user data

9:19 PM Emulator: [6172:6468:1114/211933.355:ERROR:backend_impl.cc(1065)] Critical error found -8

9:19 PM Emulator: [6172:6468:1114/211933.356:ERROR:entry_impl.cc(1062)] No file for c1030182

9:19 PM Emulator: [6172:6468:1114/211933.386:ERROR:entry_impl.cc(1062)] No file for b102001e

9:19 PM Emulator: [6172:6468:1114/211933.387:ERROR:entry_impl.cc(1062)] No file for b302002c