Android -- setWillNotDraw()

標籤：

乾貨                                                                                   

處理onDraw()方法不被執行的解決方案：

setWillNotDraw(false);

官方文檔的解釋：

If this view doesn‘t do any drawing on its own, set this flag to allow further optimizations. By default, this flag is not set on View, but could be set on some View subclasses such as ViewGroup. Typically, if you override onDraw(Canvas) you should clear this flag.

用法                                                                                   

public class LayoutLayout extends LinearLayout {            public LayoutLayout (Context context, intposition) {                  super(context);                  setWillNotDraw(false);          }            @Override          protected void onDraw(Canvas canvas) {                   super.onDraw(canvas);                  }          }  }

總結                                                                                   

設定view是否更改，如果用自訂的view，重寫ondraw()應該將調用此方法設定為false，這樣程式會調用自訂的布局。

我是天王蓋地虎的分割線                                                             

Android -- setWillNotDraw()