Code examples to implement floating windows and add edge-sucking effects in Android

1. Add permissions

First, make sure your app has permission to display the floating window. existAdd the following permissions to the file:

<uses-permission android:name=".SYSTEM_ALERT_WINDOW"/>

2. Request floating window permissions

In Android 6.0 (API level 23) and later, you need to request floating window permissions at runtime:

import ;

import ;

import ;

import ;

import ;

import ;

import ;

public class MainActivity extends AppCompatActivity {

    private static final int REQUEST_CODE_OVERLAY_PERMISSION = 1001;

    @Override

    protected void onCreate(@Nullable Bundle savedInstanceState) {

        (savedInstanceState);

        if (.SDK_INT &gt;= Build.VERSION_CODES.M) {

            if (!(this)) {

                Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,

                        ("package:" + getPackageName()));

                startActivityForResult(intent, REQUEST_CODE_OVERLAY_PERMISSION);

            } else {

                // Permission has been obtained, displaying floating window
                showFloatingWindow();

            }

        } else {

            // Below Android 6.0, directly display floating window
            showFloatingWindow();

        }

    }

    @Override

    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {

        (requestCode, resultCode, data);

        if (requestCode == REQUEST_CODE_OVERLAY_PERMISSION) {

            if (.SDK_INT &gt;= Build.VERSION_CODES.M) {

                if ((this)) {

                    // Permission has been obtained, displaying floating window
                    showFloatingWindow();

                }

            }

        }

    }

    private void showFloatingWindow() {

        // Code to display floating window
    }

}

3. Create floating windows and achieve edge-absorbing effect

Here is a complete example of how to create a floating window and achieve edge-absorbing effect:

import ;

import ;

import ;

import ;

import ;

import ;

import ;

import ;

import ;

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public class MainActivity extends AppCompatActivity {

    private WindowManager windowManager;

    private  layoutParams;

    private ImageView floatingView;

    @Override

    protected void onCreate(@Nullable Bundle savedInstanceState) {

        (savedInstanceState);

        if (.SDK_INT &gt;= Build.VERSION_CODES.M) {

            if (!(this)) {

                Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,

                        ("package:" + getPackageName()));

                startActivityForResult(intent, 1001);

            } else {

                showFloatingWindow();

            }

        } else {

            showFloatingWindow();

        }

    }

    @Override

    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {

        (requestCode, resultCode, data);

        if (requestCode == 1001) {

            if (.SDK_INT &gt;= Build.VERSION_CODES.M) {

                if ((this)) {

                    showFloatingWindow();

                }

            }

        }

    }

    private void showFloatingWindow() {

        windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);

        floatingView = new ImageView(this);

        (.ic_launcher_foreground); // Replace with your icon
        layoutParams = new (

                .WRAP_CONTENT,

                .WRAP_CONTENT,

                .SDK_INT &gt;= Build.VERSION_CODES.O ?

                        .TYPE_APPLICATION_OVERLAY :

                        .TYPE_PHONE,

                .FLAG_NOT_FOCUSABLE,

                

        );

         =  | ;

         = 0;

         = 100;

        (floatingView, layoutParams);

        (new () {

            private int initialX;

            private int initialY;

            private float initialTouchX;

            private float initialTouchY;

            @Override

            public boolean onTouch(View v, MotionEvent event) {

                switch (()) {

                    case MotionEvent.ACTION_DOWN:

                        initialX = ;

                        initialY = ;

                        initialTouchX = ();

                        initialTouchY = ();

                        return true;

                    case MotionEvent.ACTION_MOVE:

                         = initialX + (int) (() - initialTouchX);

                         = initialY + (int) (() - initialTouchY);

                        (floatingView, layoutParams);

                        return true;

                    case MotionEvent.ACTION_UP:

                        int screenWidth = getResources().getDisplayMetrics().widthPixels;

                        if ( &lt; screenWidth / 2) {

                             = 0;

                        } else {

                             = screenWidth;

                        }

                        (floatingView, layoutParams);

                        return true;

                }

                return false;

            }

        });

    }

    @Override

    protected void onDestroy() {

        ();

        if (floatingView != null) {

            (floatingView);

        }

    }

}

explain

Request floating window permissions:existonCreateCheck and request floating window permissions in the method.
Create a floating window:useWindowManagerCreate a floating window and set。
Achieving edge-absorbing effect:passsetOnTouchListenerMethod to monitor the touch event of the floating window, inACTION_UPAchieving edge-absorbing effect during events.

Things to note

Permission Management: Ensure that floating window permissions are requested correctly in Android 6.0 and later.
Floating window type: In Android 8.0 and later, use.TYPE_APPLICATION_OVERLAYtype.
Resource Management:existonDestroyThe floating window view is removed in the method to avoid memory leakage.

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