[英]Difference between android.R.layout.simple_spinner_dropdown_item and android.R.layout.simple_spinner_item
Here's a sample code of using spinner in android :这是在 android 中使用 spinner 的示例代码:
Spinner spinner = (Spinner) findViewById(R.id.spinner);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.gender_array, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
I have understood that we need to specify a layout for the datarows in the adapter我知道我们需要为适配器中的数据行指定布局
But why again using setDropDownViewResource()
method.但是为什么再次使用
setDropDownViewResource()
方法。 I mean what does this function do and also tell me how it is different from the constructor of the ArrayAdapter
.我的意思是这个函数做了什么,还告诉我它与
ArrayAdapter
的构造函数有何不同。
I have gone through the documentation, but didn't understand completely.我已经阅读了文档,但没有完全理解。
Here's is the difference - See below images这就是区别 - 见下图
If you're using your spinner with spinner.setAdapter(adapter);
如果您将微调器与
spinner.setAdapter(adapter);
directly in your code, your spinner will looks like above image.直接在您的代码中,您的微调器将类似于上图。
But, if you're using adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
但是,如果您使用的是
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
in your code, it'll show your spinner like below image where the spinner items will shown with radio buttons.在您的代码中,它将显示您的微调器,如下图所示,其中微调器项目将显示单选按钮。
Normally the difference between android.R.layout.simple_spinner_dropdown_item and android.R.layout.simple_spinner_item is通常 android.R.layout.simple_spinner_dropdown_item 和 android.R.layout.simple_spinner_item 之间的区别是
Simple spinner Dropdown view简单的微调器下拉视图
Simple spinner view简单的微调器视图
The difference is as below:区别如下:
use adapter1.setDropDownViewResource(android.R.layout.select_dialog_singlechoice);使用 adapter1.setDropDownViewResource(android.R.layout.select_dialog_singlechoice);
just change this setDropDownViewResource line from above choice.只需从上面的选择中更改此 setDropDownViewResource 行。
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