Android 为什么 Activity 没有 getContentView() 方法？
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Why isn't there a getContentView() method for Activity?
提问by kencorbin
The Activityclass has a setContentView()method. The PopupWindowClass has a getContentView()method but nothing else does. Is there another way to get the main content view for an activity?
这个Activity类有一个setContentView()方法。该PopupWindow班有一个getContentView()方法，但没有别的一样。是否有另一种方法可以获取活动的主要内容视图？
回答by mikeplate
I was able to get to the contents of an Activity with this call:
通过此调用，我能够访问 Activity 的内容：
ViewGroup view = (ViewGroup)getWindow().getDecorView();
You should probably check that getDecorView returns an instanceof ViewGroup for all cases, but with a LinearLayout in the Activity the code above runs fine. To get to the LinearLayout you could then just:
您可能应该检查 getDecorView 是否在所有情况下都返回 ViewGroup 的实例，但是在 Activity 中使用 LinearLayout 时，上面的代码运行良好。要进入 LinearLayout，您可以：
LinearLayout content = (LinearLayout)view.getChildAt(0);
And if you have a function like this:
如果你有这样的功能：
void logContentView(View parent, String indent) {
Log.i("test", indent + parent.getClass().getName());
if (parent instanceof ViewGroup) {
ViewGroup group = (ViewGroup)parent;
for (int i = 0; i < group.getChildCount(); i++)
logContentView(group.getChildAt(i), indent + " ");
}
}
You could iterate through all views and log their class names with the following call inside your Activity:
您可以遍历所有视图并在您的 Activity 中使用以下调用记录它们的类名：
logContentView(getWindow().getDecorView(), "");
回答by moonlightdock
Following line will do the trick:
以下行可以解决问题：
findViewById(android.R.id.content);
it is essentially same as (it needs to be called on the context of an Activity)
它本质上与（需要在活动的上下文中调用）相同
this.findViewById(android.R.id.content);
回答by bibby
I'm looking for this as well, but I just thought that it might be easier to add an id to the outermost ViewGroup.
我也在寻找这个，但我只是认为将 id 添加到最外面的 ViewGroup 可能更容易。
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/outer">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent">
I'll keep looking for a few more minutes, though. I'm into it so that I can use findViewWithTagfrom the outermost layout.
不过，我会继续寻找几分钟。我很喜欢它，以便我可以从最外面的布局中使用findViewWithTag。
