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DraggableView

DraggableView is an Android library to make floating draggable view easy.

This library basically wrap your view into DraggableView object, overriding it's onTouchListener and adds some extra utilities

Preview

Setup

In your root gradle add dependency to Jitpack:

// project build.gradle
allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

In you module gradle add dependency to library:

// module / app build.gradle
dependencies {
    ...
    implementation 'com.github.hyuwah:DraggableView:LatestVersion'
}

Contributors

Documentation

Basic Usage

// Need to declare draggable view in your activity / fragment
private lateinit var someDraggableView: DraggableView<ImageView> // can be other type of View or ViewGroup

// ... When setting up the view (i.e. onCreate) ...

// assign via DraggableView class
someDraggableView = DraggableView.Builder(someView).build()

// or assign via extensions
someDraggableView = someView.setupDraggable().build() // setupDraggable() returns DraggableView.Builder

// Above code will make `someView` draggable with default settings (Non-sticky / floating)

Builder options

private lateinit var someDraggableView: DraggableView<ImageView> // can be other View or ViewGroup

// ... inside onCreate
// via DraggableView class with builder options
someDraggableView = DraggableView.Builder(someView)
                        .setStickyMode(DraggableView.Mode.NON_STICKY)
                        .setListener(this)
                        .build()
// or via extensions with builder options
someDraggableView = someView.setupDraggable()
                        .setStickyMode(DraggableView.Mode.STICKY_X)
                        .setAnimated(true)
                        .build()

Methods

You can still add click listener to your view as usual with originalView.setOnClickListener directly to your original view or via wrappedDraggableView.getView().setOnClickListener

But for long click listener, you have to use the DraggableListener interface, as setting setOnLongClickListener directly on the view will interfere / might not be working well with the draggable view behavior

Listener

private var someDraggableListener = object: DraggableListener {
    override fun onPositionChanged(view: View) {
        // Here you can access x & y of the view while moving
        Log.d(TAG, "X: ${view.x.toString()}, Y: ${view.y.toString()}")
    }
    override fun onLongPress(view: View) {
        // Handle on long click
    }
}


// set the listener when creating the draggable view
someDraggableView = DraggableView.Builder(someView)
    .setListener(someDraggableListener)
    .build()

// or to existing one
anotherDraggableView.listener = someDraggableListener

Check example module for actual implementation

• Basic Example (Kotlin)
• Basic Example (Java)
• Scrolling Activity (Kotlin)

Draggable view over other App (Overlay)

Tested working on API 25, 28 & 29 Not working as of now on API 19 (on investigation)

This is the simplest way to setup an overlay draggable view, assuming it will be started from an activity.

It's best to use foreground service for the overlay draggable view

Some notes:

• On the service, implement OverlayDraggableListener
• We need to make the view programmatically, here i'm creating a TextView, you can also inflate a layout

class OverlayService : Service(), OverlayDraggableListener {

    private lateinit var overlayView: TextView
    private var isOverlayOn = false
    private var params: WindowManager.LayoutParams? = null
    private lateinit var windowManager: WindowManager

    override fun onBind(intent: Intent): IBinder? {
        return null
    }

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        isOverlayOn = if(isOverlayOn){
            windowManager.removeViewImmediate(overlayView)
            false
        } else {
            windowManager.addView(overlayView, params)
            true
        }
        return START_NOT_STICKY
    }

    override fun onCreate() {
        super.onCreate()
        windowManager = getSystemService(WINDOW_SERVICE) as WindowManager
        initOverlayView()
    }

    override fun onDestroy() {
        super.onDestroy()
        if(isOverlayOn){
            windowManager.removeViewImmediate(overlayView)
        }
        isOverlayOn = false
    }

    override fun onParamsChanged(updatedParams: WindowManager.LayoutParams) {
        windowManager.updateViewLayout(overlayView, updatedParams)
    }

    private fun initOverlayView() {
        overlayView = TextView(this)
        overlayView.text = "Overlay Text View"
        overlayView.textSize = 32f
        overlayView.setTextColor(Color.rgb(255, 255, 0))
        overlayView.setShadowLayer(10f, 5f, 5f, Color.rgb(56, 56, 56))
        overlayView.setOnClickListener {
            Toast.makeText(this, "Overlay view clicked", Toast.LENGTH_SHORT).show()
        }

        params = overlayView.makeOverlayDraggable(this)

    }

You also need to add some permission and define your service in manifest

<manifest>
    ...
    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
    <uses-permission android:name="android.permission.ACTION_MANAGE_OVERLAY_PERMISSION" />
    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
    ...
    <application>
        ...
        <service
            android:name=".overlay.OverlayService"
            android:enabled="true"
            android:exported="false"></service>
        ...
    </application>
</manifest>

Also, before starting the service, you need to check if the device support overlay and required permission

// in Activity

private var isOverlayOn = false // Global flag to toggle start / stop service

// Check draw over other app permission before starting the service
private fun toggleOverlay() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M &&
            !Settings.canDrawOverlays(this)
        ) {
            // Get permission first on Android M & above
            val intent = Intent(
                Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                Uri.parse("package:$packageName")
            )
            startActivityForResult(intent, 1234)
        } else {
            val i = Intent(this, OverlayService::class.java)
            if (!isOverlayOn) {
                // Show
                startService(i)
            } else {
                // Hide
                stopService(i)
            }
            isOverlayOn = !isOverlayOn
        }
    }

Check the example here

• Activity (Kotlin)
• Service (Kotlin)

Related Article

• Implementasi DraggableView di Android (Bahasa)

License

DraggableView is available under the MIT license. See the LICENSE file for more info.