android studio悬浮窗

在Android Studio中实现悬浮窗可以通过创建一个Service来实现。下面是一个简单的示例代码：

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.util.Log;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.LinearLayout;

public class FloatingWindowService extends Service {
    private WindowManager windowManager;
    private LinearLayout floatingLayout;

    @Override
    public void onCreate() {
        super.onCreate();

        // 创建悬浮窗布局
        floatingLayout = new LinearLayout(this);
        floatingLayout.setBackgroundColor(Color.TRANSPARENT);
        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
                LinearLayout.LayoutParams.WRAP_CONTENT,
                LinearLayout.LayoutParams.WRAP_CONTENT
        );
        floatingLayout.setLayoutParams(layoutParams);

        // 创建悬浮窗按钮
        Button floatingButton = new Button(this);
        floatingButton.setText("悬浮按钮");
        floatingButton.setBackgroundColor(Color.BLUE);
        floatingButton.setTextColor(Color.WHITE);
        floatingButton.setAlpha(0.7f);
        floatingButton.setOnTouchListener(new FloatingOnTouchListener());
        floatingLayout.addView(floatingButton);

        // 设置悬浮窗参数
        WindowManager.LayoutParams params;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            params = new WindowManager.LayoutParams(
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                    PixelFormat.TRANSLUCENT
            );
        } else {
            params = new WindowManager.LayoutParams(
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.TYPE_PHONE,
                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                    PixelFormat.TRANSLUCENT
            );
        }
        params.gravity = Gravity.TOP | Gravity.START;
        params.x = 0;
        params.y = 100;

        // 添加悬浮窗到窗口管理器
        windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        windowManager.addView(floatingLayout, params);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (floatingLayout != null) {
            windowManager.removeView(floatingLayout);
        }
    }

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

    private class FloatingOnTouchListener implements View.OnTouchListener {
        private int initialX;
        private int initialY;
        private float initialTouchX;
        private float initialTouchY;

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    initialX = windowManagerParams.x;
                    initialY = windowManagerParams.y;
                    initialTouchX = event.getRawX();
                    initialTouchY = event.getRawY();
                    return true;
                case MotionEvent.ACTION_MOVE:
                    int newX = initialX + (int) (event.getRawX() - initialTouchX);
                    int newY = initialY + (int) (event.getRawY() - initialTouchY);
                    windowManagerParams.x = newX;
                    windowManagerParams.y = newY;
                    windowManager.updateViewLayout(floatingLayout, windowManagerParams);
                    return true;
            }
            return false;
        }
    }
}

请注意，为了在Android 8.0及更高版本上正常工作，需要在AndroidManifest.xml文件中添加以下权限：

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

此外，还需要在AndroidManifest.xml文件中注册Service：

<service android:name=".FloatingWindowService" />

请确保在使用悬浮窗时遵守相关的隐私和安全规定。