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>