package dongzhong.testforfloatingwindow;

import android.app.Service;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.os.Build;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.provider.Settings;
import android.support.annotation.Nullable;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageView;

/**

• Created by dongzhong on 2018/5/30.
  */

public class FloatingImageDisplayService extends Service {
public static boolean isStarted = false;

private WindowManager windowManager;
private WindowManager.LayoutParams layoutParams;

private View displayView;

private int[] images;
private int imageIndex = 0;

private Handler changeImageHandler;

@Override
public void onCreate() {
    super.onCreate();
    isStarted = true;
    windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
    layoutParams = new WindowManager.LayoutParams();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
    } else {
        layoutParams.type = WindowManager.LayoutParams.TYPE_PHONE;
    }
    layoutParams.format = PixelFormat.RGBA_8888;
    layoutParams.gravity = Gravity.LEFT | Gravity.TOP;
    layoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
    layoutParams.width = 500;
    layoutParams.height = 500;
    layoutParams.x = 300;
    layoutParams.y = 300;

    images = new int[] {
            R.drawable.image_01,
            R.drawable.image_02,
            R.drawable.image_03,
            R.drawable.image_04,
            R.drawable.image_05,
    };

    changeImageHandler = new Handler(this.getMainLooper(), changeImageCallback);
}

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    showFloatingWindow();
    return super.onStartCommand(intent, flags, startId);
}

private void showFloatingWindow() {
    if (Settings.canDrawOverlays(this)) {
        LayoutInflater layoutInflater = LayoutInflater.from(this);
        displayView = layoutInflater.inflate(R.layout.image_display, null);
        displayView.setOnTouchListener(new FloatingOnTouchListener());
        ImageView imageView = displayView.findViewById(R.id.image_display_imageview);
        imageView.setImageResource(images[imageIndex]);
        windowManager.addView(displayView, layoutParams);

        changeImageHandler.sendEmptyMessageDelayed(0, 2000);
    }
}

private Handler.Callback changeImageCallback = new Handler.Callback() {
    @Override
    public boolean handleMessage(Message msg) {
        if (msg.what == 0) {
            imageIndex++;
            if (imageIndex >= 5) {
                imageIndex = 0;
            }
            if (displayView != null) {
                ((ImageView) displayView.findViewById(R.id.image_display_imageview)).setImageResource(images[imageIndex]);
            }

            changeImageHandler.sendEmptyMessageDelayed(0, 2000);
        }
        return false;
    }
};

private class FloatingOnTouchListener implements View.OnTouchListener {
    private int x;
    private int y;

    @Override
    public boolean onTouch(View view, MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                x = (int) event.getRawX();
                y = (int) event.getRawY();
                break;
            case MotionEvent.ACTION_MOVE:
                int nowX = (int) event.getRawX();
                int nowY = (int) event.getRawY();
                int movedX = nowX - x;
                int movedY = nowY - y;
                x = nowX;
                y = nowY;
                layoutParams.x = layoutParams.x + movedX;
                layoutParams.y = layoutParams.y + movedY;
                windowManager.updateViewLayout(view, layoutParams);
                break;
            default:
                break;
        }
        return false;
    }
}

}

package dongzhong.testforfloatingwindow;

import android.app.Service;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.PixelFormat;
import android.os.Build;
import android.os.IBinder;
import android.provider.Settings;
import android.support.annotation.Nullable;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;

/**

• Created by dongzhong on 2018/5/30.
  */

public class FloatingButtonService extends Service {
public static boolean isStarted = false;

private WindowManager windowManager;
private WindowManager.LayoutParams layoutParams;

private Button button;

@Override
public void onCreate() {
    super.onCreate();
    isStarted = true;
    windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
    layoutParams = new WindowManager.LayoutParams();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
    } else {
        layoutParams.type = WindowManager.LayoutParams.TYPE_PHONE;
    }
    layoutParams.format = PixelFormat.RGBA_8888;
    layoutParams.gravity = Gravity.LEFT | Gravity.TOP;
    layoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
    layoutParams.width = 500;
    layoutParams.height = 100;
    layoutParams.x = 300;
    layoutParams.y = 300;
}

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    showFloatingWindow();
    return super.onStartCommand(intent, flags, startId);
}

private void showFloatingWindow() {
    if (Settings.canDrawOverlays(this)) {
        button = new Button(getApplicationContext());
        button.setText("Floating Window");
        button.setBackgroundColor(Color.BLUE);
        windowManager.addView(button, layoutParams);

        button.setOnTouchListener(new FloatingOnTouchListener());
    }
}

private class FloatingOnTouchListener implements View.OnTouchListener {
    private int x;
    private int y;

    @Override
    public boolean onTouch(View view, MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                x = (int) event.getRawX();
                y = (int) event.getRawY();
                break;
            case MotionEvent.ACTION_MOVE:
                int nowX = (int) event.getRawX();
                int nowY = (int) event.getRawY();
                int movedX = nowX - x;
                int movedY = nowY - y;
                x = nowX;
                y = nowY;
                layoutParams.x = layoutParams.x + movedX;
                layoutParams.y = layoutParams.y + movedY;
                windowManager.updateViewLayout(view, layoutParams);
                break;
            default:
                break;
        }
        return false;
    }
}

}