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app/src/main/java/com/example/ueberwachungssystem/PermissionRequest.java

+package com.example.ueberwachungssystem;
+
+import static android.Manifest.permission.INTERNET;
+import static android.Manifest.permission.CAMERA;
+import static android.Manifest.permission.RECORD_AUDIO;
+
+import android.content.DialogInterface;
+import android.content.pm.PackageManager;
+import android.os.Bundle;
+import android.os.Handler;
+import android.view.View;
+import android.widget.Toast;
+
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.content.ContextCompat;
+
+public class PermissionRequest extends AppCompatActivity{
+    private static final int PERMISSION_REQUEST_CODE = 123;
+    private final MainActivity mainActivity;
+
+    boolean prüfen= false;
+
+    Handler handler = new Handler();
+
+    public PermissionRequest(MainActivity mainActivity) {
+        this.mainActivity = mainActivity;
+    }
+
+    public StringBuilder rechtePruefen() {
+        boolean rechtKamera = ContextCompat.checkSelfPermission(mainActivity, CAMERA) == PackageManager.PERMISSION_GRANTED;
+        boolean rechtMikrofon = ContextCompat.checkSelfPermission(mainActivity, RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED;
+        boolean rechtInternet = ContextCompat.checkSelfPermission(mainActivity, INTERNET) == PackageManager.PERMISSION_GRANTED;
+        StringBuilder sb = new StringBuilder();
+        sb.append("Rechte prüfen:")
+                .append("\nKamera: ").append(rechtKamera)
+                .append("\nMikrofon: ").append(rechtMikrofon)
+                .append("\nInternet: ").append(rechtInternet);
+        //mainActivity.runOnUiThread(() -> mainActivity.tvMessages.setText(sb));
+        if (!(rechtKamera && rechtMikrofon && rechtInternet)){
+            handler.post(new Runnable() {
+                @Override
+                public void run() {
+                    Toast.makeText(mainActivity.getApplicationContext(),"Es werden Rechte benötigt", Toast.LENGTH_LONG).show();
+                }
+            });
+        }
+        return sb;
+    }
+
+    public void rechteAnfordern() {
+        /*handler.post(new Runnable() {
+            @Override
+            public void run() {
+                Toast.makeText(mainActivity.getApplicationContext(),"Fordere Rechte an", Toast.LENGTH_LONG).show();
+            }
+        });*/
+        mainActivity.requestPermissions(new String[]{CAMERA, RECORD_AUDIO, INTERNET}, PERMISSION_REQUEST_CODE);
+    }
+
+    @Override
+    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
+        if (requestCode == PERMISSION_REQUEST_CODE && grantResults.length > 0) {
+            boolean rechtKamera = grantResults[0] == PackageManager.PERMISSION_GRANTED;
+            boolean rechtMikrofon = grantResults[1] == PackageManager.PERMISSION_GRANTED;
+            boolean rechtInternet = grantResults[2] == PackageManager.PERMISSION_GRANTED;
+
+            if (rechtKamera && rechtMikrofon && rechtInternet)
+                handler.post(new Runnable() {
+                    @Override
+                    public void run() {
+                        Toast.makeText(mainActivity.getApplicationContext(),"Alle benötigten Rechte sind gewährt.", Toast.LENGTH_LONG).show();
+                    }
+                });
+            else {
+                if (!rechtKamera) {
+                    handler.post(new Runnable() {
+                        @Override
+                        public void run() {
+                            Toast.makeText(mainActivity.getApplicationContext(),"Kein Recht auf Kamera gewährt.", Toast.LENGTH_SHORT).show();
+                        }
+                    });
+                    if (shouldShowRequestPermissionRationale(CAMERA)) {
+                        zeigeDialog("Du musst uns Zugriff auf deine Kamera gestatten, damit wir dich besser sehen können.");
+                    }
+                }
+                if (!rechtMikrofon) {
+                    handler.post(new Runnable() {
+                        @Override
+                        public void run() {
+                            Toast.makeText(mainActivity.getApplicationContext(),"Kein Recht auf Mikrofon gewährt.", Toast.LENGTH_SHORT).show();
+                        }
+                    });
+                    if (shouldShowRequestPermissionRationale(RECORD_AUDIO)) {
+                        zeigeDialog("Du musst uns Zugriff auf dein Mikrofon gestatten, damit wir dich besser hören können.");
+                    }
+                }
+                if (!rechtInternet) {
+                    handler.post(new Runnable() {
+                        @Override
+                        public void run() {
+                            Toast.makeText(mainActivity.getApplicationContext(),"Kein Recht auf Ortung gewährt.", Toast.LENGTH_SHORT).show();
+                        }
+                    });
+                    if (shouldShowRequestPermissionRationale(INTERNET)) {
+                        zeigeDialog("Du musst uns Zugriff auf dein Internet gestatten, damit wir eine Verbindung aufbauen können.");
+                    }
+                }
+            }
+        }
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+    }
+
+    private void zeigeDialog(String begruendung) {
+        new AlertDialog.Builder(mainActivity.getApplicationContext())
+                .setMessage(begruendung)
+                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+                        requestPermissions(new String[]{CAMERA, RECORD_AUDIO, INTERNET}, PERMISSION_REQUEST_CODE);
+                    }
+                })
+                .setNegativeButton("Abbruch", null)
+                .create()
+                .show();
+    }
+}

app/src/main/java/com/example/ueberwachungssystem/PopUpClass.java

+package com.example.ueberwachungssystem;
+
+import android.view.Gravity;
+import android.view.LayoutInflater;
+import android.view.MotionEvent;
+import android.view.View;
+import android.widget.Button;
+import android.widget.LinearLayout;
+import android.widget.PopupWindow;
+import android.widget.TextView;
+
+public class PopUpClass {
+    private final MainActivity mainActivity;
+
+    PermissionRequest permission;
+    TextView PopUpText;
+
+
+    public PopUpClass(MainActivity mainActivity) {
+        this.mainActivity = mainActivity;
+        permission = new PermissionRequest(mainActivity);
+    }
+
+    //PopupWindow display method
+
+    public void showPopupWindow(final View view) {
+
+
+        //Create a View object yourself through inflater
+        LayoutInflater inflater = (LayoutInflater) view.getContext().getSystemService(view.getContext().LAYOUT_INFLATER_SERVICE);
+        View popupView = inflater.inflate(R.layout.popup_window, null);
+
+        //Specify the length and width through constants
+        int width = LinearLayout.LayoutParams.WRAP_CONTENT;
+        int height = LinearLayout.LayoutParams.WRAP_CONTENT;
+
+        //Make Inactive Items Outside Of PopupWindow
+        boolean focusable = true;
+
+        //Create a window with our parameters
+        final PopupWindow popupWindow = new PopupWindow(popupView,width*1, height*1, focusable);
+
+        //Set the location of the window on the screen
+        popupWindow.showAtLocation(view, Gravity.CENTER, 0, 0);
+
+        //Initialize the elements of our window, install the handler
+
+        PopUpText = popupView.findViewById(R.id.titleText);
+
+        Button buttonEdit = popupView.findViewById(R.id.RechteAnfordern);
+        buttonEdit.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                RechteAnfordern();
+            }
+        });
+
+        //Handler for clicking on the inactive zone of the window
+
+        popupView.setOnTouchListener(new View.OnTouchListener() {
+            @Override
+            public boolean onTouch(View v, MotionEvent event) {
+
+                //Close the window when clicked
+                popupWindow.dismiss();
+                return true;
+            }
+        });
+    }
+    public void RechtePrüfen(){
+        StringBuilder Text = permission.rechtePruefen();
+        PopUpText.setText(Text);
+    }
+    public void RechteAnfordern(){
+        permission.rechteAnfordern();
+        StringBuilder Text = permission.rechtePruefen();
+        PopUpText.setText(Text);
+    }
+    public void Sensoren(){
+        PopUpText.setText("Es können 3 verschiedene Sensoren verwendet werden \n -1. Beschleunigungssensor\n -2. Mikrofon\n -3. Kamera");
+    }
+    public void Impressum(){
+        PopUpText.setText("Die Ueberwachungsapp wurde im Rahmen eines Praktikums der TH-Nürnberg programmiert");
+    }
+
+}

app/src/main/res/layout/popup_window.xml

+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:paddingLeft="10dp"
+    android:paddingRight="10dp"
+    android:gravity="center"
+    android:background="#A5ACB2">
+
+    <TextView
+        android:id="@+id/titleText"
+        android:layout_gravity="center"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Aktualisieren"
+        android:textSize="20sp"
+        android:textStyle="italic"
+        android:padding="10dp"/>
+
+    <Button
+        android:id="@+id/RechteAnfordern"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:text="Rechte Anfordern" />
+
+
+
+</LinearLayout>

app/src/main/res/menu/options_menu.xml

+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android" >
+    <item android:id="@+id/Rechteverwaltung"
+        android:title="Rechteverwaltung" />
+    <item android:id="@+id/Sensoren"
+        android:title="Sensoren" />
+    <item android:id="@+id/Impressum"
+        android:title="Impressum" />
+</menu>