Shake Detection added.

.idea/compiler.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="CompilerConfiguration">
-    <bytecodeTargetLevel target="1.8" />
+    <bytecodeTargetLevel target="11" />
   </component>
 </project>

.idea/misc.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">

.idea/runConfigurations.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RunConfigurationProducerService">
+    <option name="ignoredProducers">
+      <set>
+        <option value="com.android.tools.idea.compose.preview.runconfiguration.ComposePreviewRunConfigurationProducer" />
+      </set>
+    </option>
+  </component>
+</project>

app/src/main/java/de/edotzlaff/schockwelle/EarthquakeMapsActivity.java

 package de.edotzlaff.schockwelle;
 
 import android.Manifest;
+import android.content.Context;
 import android.content.pm.PackageManager;
 import android.location.Location;
 import android.os.Bundle;
+import android.os.CountDownTimer;
 import android.os.SystemClock;
 import android.util.Log;
+import android.widget.Button;
+import android.widget.TextView;
 import android.widget.Toast;
 
+import android.hardware.Sensor;
+import android.hardware.SensorEvent;
+import android.hardware.SensorEventListener;
+import android.hardware.SensorManager;
+
 import androidx.annotation.NonNull;
 import androidx.core.app.ActivityCompat;
 import androidx.core.content.ContextCompat;
 import com.google.firebase.database.ValueEventListener;
 import java.util.Calendar;
 import java.util.Date;
+import java.util.Objects;
 
 public class EarthquakeMapsActivity extends FragmentActivity implements OnMapReadyCallback {
 
     private double breitengrad;
     private double laengengrad;
 
+    //Shake Sensor
+    private SensorManager mSensorManager;
+    private static final float mUpperThreshold = 10.5f; // für Emulator auf 1.5 setzen
+    private static final float mLowerThreshold = 5.5f; // für Emulator auf 0.5 setzen
+    private static final long mShakeDetectionLockTimeMicroSeconds = 10000;
+    private float mAccel;
+    private float mAccelCurrent;
+    private float mAccelLast;
+    private boolean mShakeDetectionIsActive = false;
+    private boolean mShakeDetected = false;
+    private CountDownTimer  mLockTimer = new CountDownTimer(mShakeDetectionLockTimeMicroSeconds, 1000) {
+        public void onTick(long millisUntilFinished) {
+            ((TextView)   findViewById(R.id.txtEarthquake)).setText("Earthquake started! Detection locked for " + millisUntilFinished / 1000 + " s");
+        }
+
+        public void onFinish() {
+            mShakeDetectionIsActive = true;
+            mShakeDetected = false;
+            Toast.makeText(getApplicationContext(), "Shake Detection unlocked", Toast.LENGTH_SHORT).show();
+            ( (TextView)   findViewById(R.id.txtEarthquake)).setText("Shake your Smartphone for an Earthquake");
+        }
+    };
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_earthquake_maps);
+        TextView txtEarthquake =  (TextView) findViewById(R.id.txtEarthquake);
+        mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
+        Objects.requireNonNull(mSensorManager).registerListener(mSensorListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
+        mAccel = 1f;
+        mAccelCurrent = SensorManager.GRAVITY_EARTH;
+        mAccelLast = SensorManager.GRAVITY_EARTH;
+        mShakeDetectionIsActive = true;
+        mShakeDetected = false;
 
         getDataBaseValues();    //TODO Edward: Nur als Anmerkung, diese Methode erfolgt damit deine Methode getDeviceLocation rechtzeitig Koordinaten aus der DB bekommt
                                 //TODO Hast schon echt viel erledigt :D Ich habe gedacht das die Class EarthquakeMapsActivity Daten an die DB schickt und die SensorMapsActivity die Daten bekommt, ich glaub die Funktion muss in die andere Class
         getLocationPermission();
+
+
+
+    }
+
+    private final SensorEventListener mSensorListener = new SensorEventListener() {
+        @Override
+        public void onSensorChanged(SensorEvent event) {
+            float x = event.values[0];
+            float y = event.values[1];
+            float z = event.values[2];
+            mAccelLast = mAccelCurrent;
+            mAccelCurrent = (float) Math.sqrt((double) (x * x + y * y + z * z));
+            float delta = mAccelCurrent - mAccelLast;
+            mAccel = mAccel * 0.9f + delta;
+          //  Log.d(TAG,"mAccel: "+ mAccel);
+            if (mShakeDetectionIsActive) {
+                if(Math.abs(mAccel) > mUpperThreshold) {
+                    new CountDownTimer(50, 10) {
+
+                        public void onTick(long millisUntilFinished) {
+                            if (Math.abs(mAccel) > mUpperThreshold) {
+                                mShakeDetectionIsActive = false;
+                            } else if (Math.abs(mAccel) < mLowerThreshold) {
+                                mShakeDetectionIsActive = true;
+                                this.cancel();
+                            }
+
+                        }
+
+                        public void onFinish() {
+                            if (Math.abs(mAccel) > mUpperThreshold) {
+                                mShakeDetectionIsActive = false;
+                                mShakeDetected = true;
+                                Toast.makeText(getApplicationContext(), "Shake event detected", Toast.LENGTH_SHORT).show();
+                                writeEarthquakeToDatabase();
+                                mLockTimer.start();
+                            } else {
+                                mShakeDetectionIsActive = true;
+                                mShakeDetected = false;
+                            }
+                        }
+                    }.start();
+                }
+            }
+        }
+        @Override
+        public void onAccuracyChanged(Sensor sensor, int accuracy) {
+        }
+    };
+
+    private void writeEarthquakeToDatabase()
+    {
+        //TODO Erdbeben + Erzeugerparameter in Datenbank schreiben
+    }
+    @Override
+    protected void onResume() {
+        mSensorManager.registerListener(mSensorListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
+                SensorManager.SENSOR_DELAY_NORMAL);
+        super.onResume();
+    }
+    @Override
+    protected void onPause() {
+        mSensorManager.unregisterListener(mSensorListener);
+        super.onPause();
     }
 
     private void getLocationPermission() {

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

     tools:context=".EarthquakeMapsActivity">
 
     <TextView
+        android:id="@+id/txtEarthquake"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Shake your Smartphone for a Earthquake"
         android:layout_centerHorizontal="true"
-        android:id="@+id/txtEarthquake"/>
+        android:text="Shake your Smartphone for an Earthquake" />
 
 
 <fragment xmlns:android="http://schemas.android.com/apk/res/android"

build.gradle

         jcenter()
     }
     dependencies {
-        classpath "com.android.tools.build:gradle:4.1.3"
+        classpath 'com.android.tools.build:gradle:4.2.1'
         classpath 'com.google.gms:google-services:4.3.8'
 
         // NOTE: Do not place your application dependencies here; they belong

gradle/wrapper/gradle-wrapper.properties

 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-all.zip