Android Studio实现自定义全局悬浮按钮的示例代码

public class FloatingButtonService extends Service {
    private WindowManager windowManager;
    private View floatingButton;

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

    @Override
    public void onCreate() {
        super.onCreate();
        
        // 创建悬浮按钮视图
        floatingButton = LayoutInflater.from(this).inflate(R.layout.floating_button, null);
        
        // 设置按钮点击事件
        floatingButton.findViewById(R.id.float_button).setOnClickListener(v -> {
            // 处理点击事件
            Toast.makeText(this, "悬浮按钮被点击", Toast.LENGTH_SHORT).show();
        });

        // 设置窗口参数
        WindowManager.LayoutParams params = new WindowManager.LayoutParams(
            WindowManager.LayoutParams.WRAP_CONTENT,
            WindowManager.LayoutParams.WRAP_CONTENT,
            Build.VERSION.SDK_INT >= Build.VERSION_CODES.O ?
                WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY :
                WindowManager.LayoutParams.TYPE_PHONE,
            WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
            PixelFormat.TRANSLUCENT);
        
        // 设置初始位置
        params.gravity = Gravity.TOP | Gravity.START;
        params.x = 0;
        params.y = 100;
        
        // 获取WindowManager并添加视图
        windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        windowManager.addView(floatingButton, params);
        
        // 添加拖拽功能
        addDragFeature();
    }

    private void addDragFeature() {
        floatingButton.setOnTouchListener(new 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 = params.x;
                        initialY = params.y;
                        initialTouchX = event.getRawX();
                        initialTouchY = event.getRawY();
                        return true;
                    case MotionEvent.ACTION_MOVE:
                        params.x = initialX + (int) (event.getRawX() - initialTouchX);
                        params.y = initialY + (int) (event.getRawY() - initialTouchY);
                        windowManager.updateViewLayout(floatingButton, params);
                        return true;
                }
                return false;
            }
        });
    }

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

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <ImageButton
        android:id="@+id/float_button"
        android:layout_width="56dp"
        android:layout_height="56dp"
        android:background="@drawable/circle_background"
        android:src="@drawable/ic_float_button"
        android:elevation="8dp"
        android:layout_margin="16dp" />

</FrameLayout>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <solid android:color="@color/colorPrimary" />
</shape>

// 在需要显示悬浮按钮的地方启动服务
startService(new Intent(context, FloatingButtonService.class));

// 停止服务
stopService(new Intent(context, FloatingButtonService.class));

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

// 检查悬浮窗权限
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    if (!Settings.canDrawOverlays(this)) {
        Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
                Uri.parse("package:" + getPackageName()));
        startActivityForResult(intent, OVERLAY_PERMISSION_REQ);
    } else {
        // 已经有权限，启动服务
        startService(new Intent(this, FloatingButtonService.class));
    }
} else {
    // 6.0以下直接启动
    startService(new Intent(this, FloatingButtonService.class));
}

// 在按钮点击时添加动画
floatingButton.setOnClickListener(v -> {
    // 缩放动画
    ObjectAnimator scaleX = ObjectAnimator.ofFloat(v, "scaleX", 1f, 0.8f, 1f);
    ObjectAnimator scaleY = ObjectAnimator.ofFloat(v, "scaleY", 1f, 0.8f, 1f);
    
    AnimatorSet animatorSet = new AnimatorSet();
    animatorSet.playTogether(scaleX, scaleY);
    animatorSet.setDuration(200);
    animatorSet.start();
    
    // 执行点击操作
    performButtonAction();
});

private void autoAttachToEdge() {
    int screenWidth = getResources().getDisplayMetrics().widthPixels;
    int buttonWidth = floatingButton.getWidth();
    
    if (params.x < screenWidth / 2 - buttonWidth / 2) {
        // 吸附到左边
        params.x = 0;
    } else {
        // 吸附到右边
        params.x = screenWidth - buttonWidth;
    }
    
    windowManager.updateViewLayout(floatingButton, params);
}

public void hideButton() {
    floatingButton.animate()
        .translationY(floatingButton.getHeight())
        .setDuration(300)
        .start();
}

public void showButton() {
    floatingButton.animate()
        .translationY(0)
        .setDuration(300)
        .start();
}

<androidx.coordinatorlayout.widget.CoordinatorLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- 其他内容 -->

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="16dp"
        android:src="@drawable/ic_add" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>