安卓16王炸更新!四角圆角终于能“各玩各的”

背景

在马哥讲解三分屏实战适配aosp 16时候，最后三分屏运行效果如下：

学员疑问如下：简单说我们原来设置的圆角，其实都是整个Task四个角都进行设置圆角，这里明显看到Task的左边没有任何圆角，但是右边都是圆角。

那么大家是否有思考过这个是如何实现的么？如果让你去实现你会去如何设计呢？

新api接口讲解：

老版本aosp14上设置圆角接口只有一个

/**
         * Sets the corner radius of a {@link SurfaceControl}.
         * @param sc SurfaceControl
         * @param cornerRadius Corner radius in pixels.
         * @return Itself.
         * @hide
         */
        @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
public Transaction setCornerRadius(SurfaceControl sc, float cornerRadius){
            checkPreconditions(sc);
            nativeSetCornerRadius(mNativeObject, sc.mNativeObject, cornerRadius);

returnthis;
        }

传递参数也只要核心的一个cornerRadius参数既可以。

但是经过调查发现新版本aosp16上发现一个新的

aosp16版本上 frameworks/base/core/java/android/view/SurfaceControl.java

/**
         * Sets the corner radius of a {@link SurfaceControl}. This corner radius is applied to the
         * SurfaceControl and its children. The API expects a crop to be set on the SurfaceControl
         * to ensure that the corner radius is applied to the correct region. If the crop does not
         * intersect with the SurfaceControl's visible content, the corner radius will not be
         * applied.
         *
         * @param sc SurfaceControl
         * @param cornerRadius Corner radius in pixels.
         * @return Itself.
         * @hide
         */
        @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
public Transaction setCornerRadius(SurfaceControl sc, float cornerRadius){
            checkPreconditions(sc);
if (SurfaceControlRegistry.sCallStackDebuggingEnabled) {
                SurfaceControlRegistry.getProcessInstance().checkCallStackDebugging(
"setCornerRadius", this, sc, "cornerRadius=" + cornerRadius);
            }
            nativeSetCornerRadius(mNativeObject, sc.mNativeObject, cornerRadius);

returnthis;
        }

/**
         * Sets the corner radius for each corner of a {@link SurfaceControl}. This is applied to
         * the SurfaceControl and its children. The API expects a crop to be set on the
         * SurfaceControl to ensure that the corner radius is applied to the correct region. If the
         * crop does not intersect with the SurfaceControl's visible content, the corner radius will
         * not be applied.
         *
         * @param sc SurfaceControl
         * @hide
         */
        @NonNull
public Transaction setCornerRadius(
                SurfaceControl sc, float topLeft, float topRight,
float bottomLeft, float bottomRight){
            checkPreconditions(sc);
if (SurfaceControlRegistry.sCallStackDebuggingEnabled) {
                SurfaceControlRegistry.getProcessInstance()
                        .checkCallStackDebugging(
"setCornerRadius",
this,
                                sc,
"topLeft=" + topLeft
                                + " , topRight=" + topRight
                                + ", bottomLeft=" + bottomLeft
                                + " , bottomRight=" + bottomRight);
            }

if (!com.android.graphics.surfaceflinger.flags.Flags.setClientDrawnCornerRadii()) {
                Log.w(TAG, "setCornerRadius was called but"
                           + "set_client_drawn_corner_radii flag is disabled");
returnthis;
            }
            nativeSetCornerRadius(mNativeObject, sc.mNativeObject,
                                        topLeft, topRight, bottomLeft, bottomRight);

returnthis;
        }

上面可以看出在aosp16明显就有多出一个setCornerRadius接口，可以设置四个角的圆角弧度：

 setCornerRadius(
                SurfaceControl sc, float topLeft, float topRight,
float bottomLeft, float bottomRight)

这样有了这个接口后，就可以轻易实现对四个圆角轻易控制。

实现源码：

为了简单测试一下这个接口是否生效，看看效果如何，那就对所有的窗口都进行相关的圆角测试：

frameworks/base/services/core/java/com/android/server/wm/WindowStateAnimator.java

    private void showRobustly(SurfaceControl.Transaction t) {

        //省略部分
        //左边的圆角弧度都是50，右边圆角弧度150
        t.setCornerRadius(mSurfaceControl,50,150,50,100);
        t.setWindowCrop(mSurfaceControl,mWin.mRequestedWidth,mWin.mRequestedHeight);
          //省略部分
    }