jjoe64/android-motion-detection

Camera motion detector example

Download

Step 1. Add the JitPack repository to your build file

Add it in your root settings.gradle at the end of repositories:

	dependencyResolutionManagement {
		repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
		repositories {
			mavenCentral()
			maven { url 'https://jitpack.io' }
		}
	}

Add it in your settings.gradle.kts at the end of repositories:

	dependencyResolutionManagement {
		repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
		repositories {
			mavenCentral()
			maven { url = uri("https://jitpack.io") }
		}
	}

Add to pom.xml

	<repositories>
		<repository>
		    <id>jitpack.io</id>
		    <url>https://jitpack.io</url>
		</repository>
	</repositories>

Add it in your build.sbt at the end of resolvers:

 
    resolvers += "jitpack" at "https://jitpack.io"

Add it in your project.clj at the end of repositories:

 
    :repositories [["jitpack" "https://jitpack.io"]]

Step 2. Add the dependency

	dependencies {
		implementation 'com.github.appsthatmatter:android-motion-detection:'
	}
	dependencies {
		implementation("com.github.appsthatmatter:android-motion-detection:")
	}
	<dependency>
	    <groupId>com.github.appsthatmatter</groupId>
	    <artifactId>android-motion-detection</artifactId>
	    <version></version>
	</dependency>

                            
    libraryDependencies += "com.github.appsthatmatter" % "android-motion-detection" % ""
        
        

                            
    :dependencies [[com.github.appsthatmatter/android-motion-detection ""]]

Readme

Android Motion Detector

functional description

The preview of the camera will be drawn on a 1x1 pixel surface. At this point the preview input of the camera will be analysed at a given interval. To detect a movement the picture will be dived into tiles. For each tile the average brightness will be calculated. If a average value of a single tile differs from the previous value, a motion is registered.

integration

  1. Copy all classes of the subpackge motiondetection into your project. Adapt the package names.
  2. There must be a SurfaceView in your layout:
<SurfaceView
    android:layout_width="1dp"
    android:layout_height="1dp"
    android:id="@+id/surfaceView" />
  1. create instance of MotionDetector
motionDetector = new MotionDetector(this, (SurfaceView) findViewById(R.id.surfaceView));
  1. call lifecycle methods: motionDetector.onResume() and .onPause()
  2. register callbacks
motionDetector.setMotionDetectorCallback(new MotionDetectorCallback() {
    @Override
    public void onMotionDetected() {
        txtStatus.setText("Bewegung erkannt");
    }

    @Override
    public void onTooDark() {
        txtStatus.setText("Zu dunkel hier");
    }
});

customize parameters

there are some important parameters that can be adjusted at runtime.

| Method | Description | Default | | --- | --- | --- | | motionDetector.setCheckInterval(500); | milliseconds between pictures to compare. less = less energy cos t | 500 | | motionDetector.setLeniency(20); | maximal tolerence of difference in pictures. less = more sensible | 20 | | motionDetector.setMinLuma(1000); | minimum brightness. if lower the callback onTooDark is called | 1000 |

notice

  1. Permissions must be given in the AndroidManifest.xml
<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.CAMERA"/>
  1. if targetSdkVersion is greater than 21 you have to implement Runtime Permissions
  2. the detection is only running while the activity is active. It may make sense to build in a Wake-Lock.
  3. Parts of the code is taken from https://github.com/phishman3579/android-motion-detection

license

Jonas Gehring Apache license 2.0