我們先放一張Hierarchy?Viewer的圖：（模擬器Android4.4）

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看到數字6了嗎，那個RelativeLayout是MainActivity的根ViewGroup,?而在RelativeLayout之前還有5層，?即系統默認的界面DecorView(FrameLayout) --> LinearLayout --> FramelLayout-- >ActionBarOverlayLayout --> ContentFrameLayout.

?直接說結果吧，用模擬器在API19? 也就是Android4.4?上最大可以嵌套39層，包含系統默認的5層，也就說我們最大可以寫34層的嵌套。

當嵌套層數達到40層時報如下異常，

10-27 11:38:53.901 25582-25582/com.aquarius.customview E/AndroidRuntime: FATAL EXCEPTION: mainProcess: com.aquarius.customview, PID: 25582java.lang.StackOverflowErrorat android.util.Pools$SynchronizedPool.acquire(Pools.java:154)at android.view.GLES20RecordingCanvas.obtain(GLES20RecordingCanvas.java:43)at android.view.GLES20DisplayList.start(GLES20DisplayList.java:61)at android.view.View.getDisplayList(View.java:13323)at android.view.View.getDisplayList(View.java:13404)at android.view.View.draw(View.java:14182)at android.view.ViewGroup.drawChild(ViewGroup.java:3103)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)at android.view.View.getDisplayList(View.java:13357)at android.view.View.getDisplayList(View.java:13404)at android.view.View.draw(View.java:14182)at android.view.ViewGroup.drawChild(ViewGroup.java:3103)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)at android.view.View.getDisplayList(View.java:13357)at android.view.View.getDisplayList(View.java:13404)at android.view.View.draw(View.java:14182)at android.view.ViewGroup.drawChild(ViewGroup.java:3103)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)at android.view.View.getDisplayList(View.java:13357)at android.view.View.getDisplayList(View.java:13404)at android.view.View.draw(View.java:14182)at android.view.ViewGroup.drawChild(ViewGroup.java:3103)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)at android.view.View.getDisplayList(View.java:13357)at android.view.View.getDisplayList(View.java:13404)at android.view.View.draw(View.java:14182)at android.view.ViewGroup.drawChild(ViewGroup.java:3103)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)at android.view.View.getDisplayList(View.java:13357)at android.view.View.getDisplayList(View.java:13404)at android.view.View.draw(View.java:14182)at android.view.ViewGroup.drawChild(ViewGroup.java:3103)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)at android.view.View.getDisplayList(View.java:13357)at android.view.View.getDisplayList(View.java:13404)at android.view.View.draw(View.java:14182)at android.view.ViewGroup.drawChild(ViewGroup.java:3103)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)at android.view.View.getDisplayList(View.java:13357)at android.view.View.getDisplayList(View.java:13404)at android.view.View.draw(View.java:14182)at android.view.ViewGroup.drawChild(ViewGroup.java:3103)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)at android.view.View.getDisplayList(View.java:13357)at android.view.View.getDisplayList(View.java:13404)at android.view.View.draw(View.java:14182)at android.view.ViewGroup.drawChild(ViewGroup.java:3103)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)at android.view.View.getDisplayList(View.java:13357)at android.view.View.getDisplayList(View.java:13404)at android.view.View.draw(View.java:14182)at android.view.ViewGroup.drawChild(ViewGroup.java:3103)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)at android.view.View.getDisplayList(View.java:13357)at android.view.View.getDisplayList(View.java:13404)at android.view.View.draw(View.java:14182)at android.view.ViewGroup.drawChild(ViewGroup.java:3103)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)at android.view.View.getDisplayList(View.java:13357)at android.view.View.getDisplayList(View.java:13404)at android.view.View.draw(View.java:14182)at android.view.ViewGroup.drawChild(ViewGroup.java:3103)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)at android.view.View.getDisplayList(View.java:13357)at android.view.View.getDisplayList(View.java:13404)at android.view.View.draw(View.java:14182)at android.view.ViewGroup.drawChild(ViewGroup.java:3103)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2940)at android.view.View.getDisplayList(View.java:13357)at android.view.View.getDisplayList(View.java:13404)at android.view.View.draw(View.java:14182)at android.view.ViewGroup.drawChild(ViewGroup.java:3103)at android.view.View

View Code

在API23?Android6.0上嵌套層數可以更多，實驗了四十多層還依舊沒有crash

至于具體低于4.4的版本是什么樣的結果，我并沒有測試，且Android開源各大手機廠商可能會修改邏輯。不過考慮到向下兼容的問題，還是不應該嵌套太多層數，

當自己寫的布局層級超過10層的時候就該考慮優化布局了，因為即使應用不因為嵌套的太多而crash，也會造成渲染時間過長等問題，影響UI流暢度。

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轉載于:https://www.cnblogs.com/sphere/p/7745687.html

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