Question

我想做的是:

创建自定义提醒对话框。按钮与任何提醒对话框一样, 上面的按钮是两个文本编辑输入框。我不想创建自定义对话框, 而是定制的提醒对话框

Here is what I am trying #3: http://developer.android.com/guide/topics/ui/dialogs.html

上面写道:

AlertDialog.Builder builder;
AlertDialog alertDialog;

Context mContext = getApplicationContext();
LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(LAYOUT_INFLATER_SERVICE);
View layout = inflater.inflate(R.layout.custom_dialog,
                           (ViewGroup) findViewById(R.id.layout_root));
TextView text = (TextView) layout.findViewById(R.id.text);
text.setText("Hello, this is a custom dialog!");


builder = new AlertDialog.Builder(mContext);
builder.setView(layout);
alertDialog = builder.create();

文件指出:

View layout = inflater.inflate(R.layout.custom_dialog,
                           (ViewGroup) findViewById(R.id.layout_root));

第一个参数是布局资源代号,第二个参数是根视图的代号。

问题是我不知道布局 root 是什么? 这是一个对话框, 我要在活动中踢。如果活动, 我是否应该使用布局代号? 布局 root 是从帽子里拔出来的吗?

还尝试:

  View layout = inflater.inflate(R.layout.my_custom_layout,
                                   (ViewGroup)   findViewById(android.R.id.content).getRootView());

结果无效指针。

Answer 1

虽然这是一个老问题,但这一条对于寻找这一答案的其他人可能有用:

If you’ve ever written something like the following code using LayoutInflater in your Android application:

inflater.inflate(R.layout.my_layout, null);

PLEASE read on, because you’re doing it wrong and I want to explain to you why.

... <% 1 > BUT ...

Every Rule Has An Exception

There are of course instances where you can truly justify a null parent during inflation, but they are few. One such instance occurs when you are inflating a custom layout to be attached to an AlertDialog. Consider the following example where we want to use our same XML layout but set it as the dialog view:
AlertDialog.Builder builder = new AlertDialog.Builder(context);
View content = LayoutInflater.from(context).inflate(R.layout.item_row, null);

builder.setTitle("My Dialog");
builder.setView(content);
builder.setPositiveButton("OK", null);
builder.show();
The issue here is that AlertDialog.Builder supports a custom view, but does not provide an implementation of setView() that takes a layout resource; so you must inflate the XML manually. However, because the result will go into the dialog, which does not expose its root view (in fact, it doesn’t exist yet), we do not have access to the eventual parent of the layout, so we cannot use it for inflation. It turns out, this is irrelevant, because AlertDialog will erase any LayoutParams on the layout anyway and replace them with match_parent.

文章解释了为什么您应该提供父号 ViewGroup 在对话框大楼以外的大多数情况下。

Answer 2

Ok 。文档中的根视图指的是自定义布局中的元素。因此, 自定义布局将有一个叫作根视图的最外部视图。您需要给此一个标识, 而不是您能够按显示的方式通过它。因此, 第一个参数是自定义视图 id, 第二个参数是自定义布局元素在自定义视图中的代号。

 View layout = inflater.inflate(R.layout.custom_dialog,
                       (ViewGroup) findViewById(R.id.layout_root));

因此,在以上文档中的示例中, R.id.layout_root 引用您给定的 id, 例如在自定义对话框布局内最外端线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性线性

Answer 3

你试过这个吗?

View layout = inflater.inflate(R.layout.custom_dialog,null);

Answer 4

builder.setView(layout);
layout.getRootView();

应该给 LinearLayout 提供 LinearLayout 。

Every Rule Has An Exception

友情链接