blocks|key|1431106|text|使用以下代码：spinnerObject.setSelection(INDEX_OF_CATEGORY2)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1431107|entityMap^0|7|1A|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Use the following:
<code>spinnerObject.setSelection(INDEX_OF_CATEGORY2)</code>.

blocks|key|1431126|text|public+static+void+selectSpinnerItemByValue(Spinner+spnr,+long+value)+{
++++SimpleCursorAdapter+adapter+=+(SimpleCursorAdapter)+spnr.getAdapter();
++++for+(int+position+=+0;+position+<+adapter.getCount();+position%2B%2B)+{
++++++++if(adapter.getItemId(position)+==+value)+{
++++++++++++spnr.setSelection(position);
++++++++++++return;
++++++++}
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1431127|您可以使用上面的如下内容：|unstyled|1431128|selectSpinnerItemByValue(spinnerObject,+desiredValue);|1431129|&当然，您也可以直接按索引选择，例如|1431130|spinnerObject.setSelection(index);|1431131|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|P|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|I|3|J|5|F|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|M|3|-4|5|F|7|T|8|@]|9|@]|A|$]]]|N|$]]

<pre><code>public static void selectSpinnerItemByValue(Spinner spnr, long value) {
 SimpleCursorAdapter adapter = (SimpleCursorAdapter) spnr.getAdapter();
 for (int position = 0; position &lt; adapter.getCount(); position++) {
 if(adapter.getItemId(position) == value) {
 spnr.setSelection(position);
 return;
 }
 }
}
</code></pre>

You can use the above like:

<pre><code>selectSpinnerItemByValue(spinnerObject, desiredValue);
</code></pre>

&amp; of course you can also select by index directly like

<pre><code>spinnerObject.setSelection(index);
</code></pre>

blocks|key|1431139|text|我有一个SimpleCursorAdapter，所以我必须复制数据，以便在这篇文章中使用这个回复。所以，我建议你这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1431140|for+(int+i+=+0;+i+<+spinnerRegion.getAdapter().getCount();+i%2B%2B)+{
++++if+(spinnerRegion.getItemIdAtPosition(i)+==+Integer
++++++++.valueOf(signal.getInt(signal
++++++++++++.getColumnIndexOrThrow("id_region"))))+{
++++++++spinnerRegion.setSelection(i);
++++++++break;
++++}
}|code-block|syntax|javascript|1431141|我认为这是一种真正的方式|1431142|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I have a SimpleCursorAdapter so I have to duplicate the data for use the respose in this post. So, I recommend you try this way:

<pre><code>for (int i = 0; i &lt; spinnerRegion.getAdapter().getCount(); i++) {
 if (spinnerRegion.getItemIdAtPosition(i) == Integer
 .valueOf(signal.getInt(signal
 .getColumnIndexOrThrow("id_region")))) {
 spinnerRegion.setSelection(i);
 break;
 }
}
</code></pre>

I think that is a real way

blocks|key|1431155|text|这些答案中没有一个给出了解决办法，只解决了这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1431156|mySpinner.post(new+Runnable()+{
++++@Override
++++public+void+run()+{
++++++++mySpinner.setSelection(position);
++++}
});|code-block|syntax|javascript|1431157|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

No one of these answers gave me the solution, only worked with this:

<pre><code>mySpinner.post(new Runnable() {
 @Override
 public void run() {
 mySpinner.setSelection(position);
 }
});
</code></pre>

blocks|key|1431196|text|如果您有一个联系人列表，您可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1431197|((Spinner)+view.findViewById(R.id.mobile)).setSelection(spinnerContactPersonDesignationAdapter.getPosition(schoolContact.get(i).getCONT_DESIGNATION()));|code-block|syntax|javascript|1431198|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you have a list of contacts the you can go for this:

<pre><code>((Spinner) view.findViewById(R.id.mobile)).setSelection(spinnerContactPersonDesignationAdapter.getPosition(schoolContact.get(i).getCONT_DESIGNATION()));
</code></pre>

blocks|key|951272|text|为什么不使用DB中的值并将它们存储在ArrayList上，然后只使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|951273|yourSpinner.setSelection(yourArrayList.indexOf("Category+1"));|code-block|syntax|javascript|951274|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Why don't you use your values from the DB and store them on an ArrayList and then just use:

<pre><code>yourSpinner.setSelection(yourArrayList.indexOf("Category 1"));
</code></pre>

blocks|key|951329|text|一些解释(至少是对碎片的解释-从未尝试过纯粹的活动)。希望它能帮助人们更好地理解Android。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|951330|阿伦·乔治最流行的答案是正确的，但在某些情况下不起作用。|offset|length|951331|马可·HC的答案是，由于额外的CPU负载，使用Runnable是最后的选择。|951332|答案是-您应该简单地选择正确的位置来调用setSelection()，例如，它为我选择了works：|style|BOLD|951333|@Override
public+void+onResume()+{
++++super.onResume();

++++yourSpinner.setSelection(pos);
+}|code-block|syntax|javascript|951334|，但是它不能在onCreateView()中工作。我怀疑这就是对这个话题感兴趣的原因。|951335|秘诀是，在Android系统中，你不能用任何方法做任何你想做的事情--哎呀：(-组件可能还没准备好。)作为另一个例子，您不能滚动ScrollView，既不能在onCreateView()中滚动，也不能在onResume()中滚动(参见答案这里)|951336|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/11072576/set-selected-item-of-spinner-programmatically/11072595#11072595|1|https://stackoverflow.com/questions/11072576/set-selected-item-of-spinner-programmatically/21972242#21972242|2|https://stackoverflow.com/questions/16635834/android-scrollto-does-not-work-in-onresume-method/25291102#25291102^0|0|0|5|0|0|0|5|1|0|F|J|18|5|0|0|0|L|0|3B|2|2|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@]|9|@$D|18|E|19|1|1A]]|A|$]]|$1|F|3|G|5|6|7|1B|8|@]|9|@$D|1C|E|1D|1|1E]]|A|$]]|$1|H|3|I|5|6|7|1F|8|@$D|1G|E|1H|J|K]|$D|1I|E|1J|J|K]]|9|@]|A|$]]|$1|L|3|M|5|N|7|1K|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|1L|8|@$D|1M|E|1N|J|K]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1O|8|@]|9|@$D|1P|E|1Q|1|1R]]|A|$]]|$1|U|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]|12|$5|X|Y|Z|A|$10|13]]|14|$5|X|Y|Z|A|$10|15]]]]

Some explanation (at least for Fragments - never tried with pure Activity). Hope it helps someone to understand Android better.
Most popular answer by <a href="https://stackoverflow.com/questions/11072576/set-selected-item-of-spinner-programmatically/11072595#11072595">Arun George</a> is correct but don't work in some cases. The answer by <a href="https://stackoverflow.com/questions/11072576/set-selected-item-of-spinner-programmatically/21972242#21972242">Marco HC</a> uses Runnable wich is a last resort due to additional CPU load. The answer is - you should simply choose correct place to call to setSelection(), for example it works for me:

<pre><code>@Override
public void onResume() {
 super.onResume();

 yourSpinner.setSelection(pos);
 }
</code></pre>

But it won't work in onCreateView(). I suspect that is the reason for the interest to this topic. 
The secret is that with Android you can't do anything you want in any method - oops:( - components may just not be ready. As another example - you can't scroll ScrollView neither in onCreateView() nor in onResume() (see the answer <a href="https://stackoverflow.com/questions/16635834/android-scrollto-does-not-work-in-onresume-method/25291102#25291102">here</a>)

blocks|key|951349|text|您可以为这类工作创建一个通用方法，就像我在我的UtilityClass中所做的那样|type|unstyled|depth|inlineStyleRanges|entityRanges|data|951350|public+void+SetSpinnerSelection(Spinner+spinner,String[]+array,String+text)+{
++++for(int+i=0;i<array.length;i%2B%2B)+{
++++++++if(array[i].equals(text))+{
++++++++++++spinner.setSelection(i);
++++++++}
++++}
}|code-block|syntax|javascript|951351|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can make a generic method for this kind of work as I do in my UtilityClass which is

<pre><code>public void SetSpinnerSelection(Spinner spinner,String[] array,String text) {
 for(int i=0;i&lt;array.length;i++) {
 if(array[i].equals(text)) {
 spinner.setSelection(i);
 }
 }
}
</code></pre>

blocks|key|707824|text|若要查找值并选择它，请执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|707825|private+void+selectValue(Spinner+spinner,+Object+value)+{
++++for+(int+i+=+0;+i+<+spinner.getCount();+i%2B%2B)+{
++++++++if+(spinner.getItemAtPosition(i).equals(value))+{
++++++++++++spinner.setSelection(i);
++++++++++++break;
++++++++}
++++}
}|code-block|syntax|javascript|707826|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

To find a value and select it:

<pre><code>private void selectValue(Spinner spinner, Object value) {
 for (int i = 0; i &lt; spinner.getCount(); i++) {
 if (spinner.getItemAtPosition(i).equals(value)) {
 spinner.setSelection(i);
 break;
 }
 }
}
</code></pre>

blocks|key|951382|text|我知道已经回答了，但是简单的代码选择一个项目，非常简单：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|951383|spGenre.setSelection(+(+(ArrayAdapter)+spGenre.getAdapter()).getPosition(client.getGenre())+);|code-block|syntax|javascript|951384|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I know that is already answered, but simple code to select one item, very simple:

<pre><code>spGenre.setSelection( ( (ArrayAdapter) spGenre.getAdapter()).getPosition(client.getGenre()) );
</code></pre>

blocks|key|951400|text|++for+(int+x+=+0;+x+<+spRaca.getAdapter().getCount();+x%2B%2B)+{
++++++++++++if+(spRaca.getItemIdAtPosition(x)+==+reprodutor.getId())+{
++++++++++++++++spRaca.setSelection(x);
++++++++++++++++break;
++++++++++++}
++++++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|951401|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> for (int x = 0; x &lt; spRaca.getAdapter().getCount(); x++) {
 if (spRaca.getItemIdAtPosition(x) == reprodutor.getId()) {
 spRaca.setSelection(x);
 break;
 }
 }
</code></pre>

blocks|key|951425|text|这是我的工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|951426|+spinner.setSelection(spinner_adapter.getPosition(selected_value)%2B1);|code-block|syntax|javascript|951427|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is work for me.

<pre><code> spinner.setSelection(spinner_adapter.getPosition(selected_value)+1);
</code></pre>

blocks|key|951441|text|在我的例子中，这段代码拯救了我的生活：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|951442|public+static+void+selectSpinnerItemByValue(Spinner+spnr,+long+value)+{
++++SpinnerAdapter+adapter+=+spnr.getAdapter();
++++for+(int+position+=+0;+position+<+adapter.getCount();+position%2B%2B)+{
++++++++if(adapter.getItemId(position)+==+value)+{
++++++++++++spnr.setSelection(position);
++++++++++++return;
++++++++}
++++}
}|code-block|syntax|javascript|951443|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In my case, this code saved my day:

<pre><code>public static void selectSpinnerItemByValue(Spinner spnr, long value) {
 SpinnerAdapter adapter = spnr.getAdapter();
 for (int position = 0; position &lt; adapter.getCount(); position++) {
 if(adapter.getItemId(position) == value) {
 spnr.setSelection(position);
 return;
 }
 }
}
</code></pre>

blocks|key|1431421|text|您可以这样轻松地设置：spinner.setSelection(1)，而不是1，您可以设置想要显示的列表的任何位置。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1431422|entityMap^0|B|N|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

You can easily set like this: <code>spinner.setSelection(1)</code>, instead of 1, you can set any position of list you would like to show.

blocks|key|951487|text|这对我起了作用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|951488|@Override
protected+void+onStart()+{
++++super.onStart();
++++mySpinner.setSelection(position);
}|code-block|syntax|javascript|951489|它类似于@sberezin的解决方案，但在onStart()中调用了onStart()。|951490|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This worked for me:

<pre><code>@Override
protected void onStart() {
 super.onStart();
 mySpinner.setSelection(position);
}
</code></pre>

It's similar to @sberezin's solution but calling setSelection() in onStart().

blocks|key|951503|text|最佳解决办法是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|951504|++++public+String[]+items=+new+String[]{"item1","item2","item3"};
++++//+here+you+can+use+array+or+list+
++++ArrayAdapter+adapter=+new+ArrayAdapter(Your_Context,+R.layout.support_simple_spinner_dropdown_item,+items);
++++final+Spinner+itemsSpinner=+(Spinner)+findViewById(R.id.itemSpinner);
itemsSpinner.setAdapter(adapter);|code-block|syntax|javascript|951505|若要获取项的位置，请自动添加以下语句|951506|itemsSpinner.setSelection(itemsSpinner.getPosition("item2"));|951507|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

The optimal solution is: 

<pre><code> public String[] items= new String[]{"item1","item2","item3"};
 // here you can use array or list 
 ArrayAdapter adapter= new ArrayAdapter(Your_Context, R.layout.support_simple_spinner_dropdown_item, items);
 final Spinner itemsSpinner= (Spinner) findViewById(R.id.itemSpinner);
itemsSpinner.setAdapter(adapter);
</code></pre>

To get the position of the item automatically add the following statement 

<pre><code>itemsSpinner.setSelection(itemsSpinner.getPosition("item2"));
</code></pre>

blocks|key|1431477|text|这一点在本页其他地方的评论中有说明，但认为把它写成一个答案是有用的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1431478|在使用适配器时，我发现spinnerObject.setSelection(INDEX_OF_CATEGORY2)需要在+setAdapter调用之后发生setAdapter；否则，第一项始终是初始选择。|offset|length|style|CODE|1431479|//+spinner+setup...
spinnerObject.setAdapter(myAdapter);
spinnerObject.setSelection(INDEX_OF_CATEGORY2);|code-block|syntax|javascript|1431480|这是通过查看AbsSpinner+代码+for+setAdapter来证实的。|1431481|entityMap|0|LINK|mutability|MUTABLE|url|https://android.googlesource.com/platform/frameworks/base/%2B/2888524e03896831f487e5dee63f18f1c33c0115/core/java/android/widget/AbsSpinner.java^0|0|B|1A|1P|A|25|A|0|0|O|A|H|2|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]|$D|10|E|11|F|G]|$D|12|E|13|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|14|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|15|8|@$D|16|E|17|F|G]]|9|@$D|18|E|19|1|1A]]|A|$]]|$1|O|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

This is stated in comments elsewhere on this page but thought it useful to pull it out into an answer:

When using an adapter, I've found that the <code>spinnerObject.setSelection(INDEX_OF_CATEGORY2)</code> needs to occur after the <code>setAdapter</code> call; otherwise, the first item is always the initial selection.

<pre><code>// spinner setup...
spinnerObject.setAdapter(myAdapter);
spinnerObject.setSelection(INDEX_OF_CATEGORY2);
</code></pre>

This is confirmed by reviewing the AbsSpinner <a href="https://android.googlesource.com/platform/frameworks/base/+/2888524e03896831f487e5dee63f18f1c33c0115/core/java/android/widget/AbsSpinner.java" rel="nofollow noreferrer">code</a> for <code>setAdapter</code>.

blocks|key|951549|text|大多数情况下，spinner.setSelection(i);+//i+is+0+to+(size-1)+of+adapter's+size无法工作。如果你打电话给spinner.setSelection(i);|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|951550|这取决于你的逻辑。|951551|如果视图已经完全加载，并且您想要从接口调用它，我建议您调用|951552|spinner.setAdapter(spinner_no_of_hospitals.getAdapter());
spinner.setSelection(i);+//+i+is+0+or+within+adapter+size|code-block|syntax|javascript|951553|或者，如果您想在活动/片段生命周期之间进行更改，请按以下方式调用|951554|spinner.post(new+Runnable()+{
++@Override+public+void+run()+{
++++spinner.setSelection(i);
++}
});|951555|entityMap^0|7|1R|2A|O|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|10|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|11|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|12|8|@]|D|@]|E|$]]|$1|Q|3|R|5|L|7|13|8|@]|D|@]|E|$M|N]]|$1|S|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|T|$]]

Most of the time <code>spinner.setSelection(i); //i is 0 to (size-1) of adapter's size</code>
doesn't work. If you just call <code>spinner.setSelection(i);</code>

It depends on your logic.

If view is fully loaded and you want to call it from interface I suggest you to call 

<pre><code>spinner.setAdapter(spinner_no_of_hospitals.getAdapter());
spinner.setSelection(i); // i is 0 or within adapter size
</code></pre>

Or if you want to change between activity/fragment lifecycle, call like this

<pre><code>spinner.post(new Runnable() {
 @Override public void run() {
 spinner.setSelection(i);
 }
});
</code></pre>

blocks|key|951568|text|这是我在Kotlin用的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|951569|spinner.setSelection(resources.getStringArray(R.array.choices).indexOf("Choice+1"))|code-block|syntax|javascript|951570|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This is what I use in Kotlin:

<pre><code>spinner.setSelection(resources.getStringArray(R.array.choices).indexOf("Choice 1"))
</code></pre>

blocks|key|951606|text|我也有同样的问题，因为yesterday.Unfortunately数组列表中的第一项在默认情况下显示为spinner宽度。一个转变是用数组列表中的每个元素查找前面选定的项，并将其位置与第一个element.Here交换为代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|951607|OnResume()
{
int+before_index+=+ShowLastSelectedElement();
if+(isFound){
++++++Collections.swap(yourArrayList,before_index,0);
+++}
adapter+=+new+ArrayAdapter<String>(CurrentActivity.this,
++++++++++++++++++++++++++++android.R.layout.simple_spinner_item,+yourArrayList);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item;++++++++++++++++++++yourListView.setAdapter(adapter);
}
...
private+int+ShowLastSelectedElement()+{
++++++++String+strName+=+"";
++++++++int+swap_index+=+0;
++++++++for+(int+i=0;i<societies.size();i%2B%2B){
++++++++++++strName+=+yourArrayList.get(i);
++++++++++++if+(strName.trim().toLowerCase().equals(lastselectedelement.trim().toLowerCase())){
++++++++++++++++swap_index+=+i;
++++++++++++++++isFound+=+true;
++++++++++++}
++++++++}
++++++++return+swap_index;
++++}|code-block|syntax|javascript|951608|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I had the same issue since yesterday.Unfortunately the first item in the array list is shown by default in spinner widget.A turnaround would be to find the previous selected item with each element in the array list and swap its position with the first element.Here is the code.

<pre><code>OnResume()
{
int before_index = ShowLastSelectedElement();
if (isFound){
 Collections.swap(yourArrayList,before_index,0);
 }
adapter = new ArrayAdapter&lt;String&gt;(CurrentActivity.this,
 android.R.layout.simple_spinner_item, yourArrayList);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item; yourListView.setAdapter(adapter);
}
...
private int ShowLastSelectedElement() {
 String strName = "";
 int swap_index = 0;
 for (int i=0;i&lt;societies.size();i++){
 strName = yourArrayList.get(i);
 if (strName.trim().toLowerCase().equals(lastselectedelement.trim().toLowerCase())){
 swap_index = i;
 isFound = true;
 }
 }
 return swap_index;
 }
</code></pre>

blocks|key|707943|text|我做了一些Spinner的扩展功能，用于加载数据和跟踪项目选择。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|707944|Spinner.kt|BOLD|707945|fun+<T>+Spinner.load(context:+Context,+items:+List<T>,+item:+T?+=+null)+{
++++adapter+=+ArrayAdapter(context,+android.R.layout.simple_spinner_item,+items).apply+{
++++++++setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
++++}

++++if+(item+!=+null+&&+items.isNotEmpty())+setSelection(items.indexOf(item))
}

inline+fun+Spinner.onItemSelected(
++++crossinline+itemSelected:+(
++++++++parent:+AdapterView<*>,
++++++++view:+View,
++++++++position:+Int,
++++++++id:+Long
++++)+->+Unit
)+{
++++onItemSelectedListener+=+object+:+AdapterView.OnItemSelectedListener+{
++++++++override+fun+onNothingSelected(parent:+AdapterView<*>?)+{
++++++++}

++++++++override+fun+onItemSelected(parent:+AdapterView<*>,+view:+View,+position:+Int,+id:+Long)+{
++++++++++++itemSelected.invoke(parent,+view,+position,+id)
++++++++}
++++}
}|code-block|syntax|javascript|707946|Usaage示例|707947|val+list+=+listOf("String+1",+"String+2",+"String+3")
val+defaultData+=+"String+2"

//+load+data+to+spinner
your_spinner.load(context,+list,+defaultData)

//+load+data+without+default+selection,+it+points+to+first+item
your_spinner.load(context,+list)

//+for+watching+item+selection
your_spinner.onItemSelected+{+parent,+view,+position,+id+->+
++++//+do+on+item+selection
}|707948|entityMap^0|5|7|0|0|A|0|0|0|8|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|W|8|@$9|X|A|Y|B|H]]|D|@]|E|$]]|$1|I|3|J|5|K|7|Z|8|@]|D|@]|E|$L|M]]|$1|N|3|O|5|6|7|10|8|@$9|11|A|12|B|H]]|D|@]|E|$]]|$1|P|3|Q|5|K|7|13|8|@]|D|@]|E|$L|M]]|$1|R|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|S|$]]

I had made some extension function of <code>Spinner</code> for loading data and tracking item selection.

Spinner.kt

<pre><code>fun &lt;T&gt; Spinner.load(context: Context, items: List&lt;T&gt;, item: T? = null) {
 adapter = ArrayAdapter(context, android.R.layout.simple_spinner_item, items).apply {
 setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
 }

 if (item != null &amp;&amp; items.isNotEmpty()) setSelection(items.indexOf(item))
}

inline fun Spinner.onItemSelected(
 crossinline itemSelected: (
 parent: AdapterView&lt;*&gt;,
 view: View,
 position: Int,
 id: Long
 ) -&gt; Unit
) {
 onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
 override fun onNothingSelected(parent: AdapterView&lt;*&gt;?) {
 }

 override fun onItemSelected(parent: AdapterView&lt;*&gt;, view: View, position: Int, id: Long) {
 itemSelected.invoke(parent, view, position, id)
 }
 }
}
</code></pre>

Usaage Example

<pre><code>val list = listOf("String 1", "String 2", "String 3")
val defaultData = "String 2"

// load data to spinner
your_spinner.load(context, list, defaultData)

// load data without default selection, it points to first item
your_spinner.load(context, list)

// for watching item selection
your_spinner.onItemSelected { parent, view, position, id -&gt; 
 // do on item selection
}
</code></pre>

blocks|key|951646|text|下面是我使用的Kotlin扩展：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|951647|fun+Spinner.setItem(list:+Array<CharSequence>,+value:+String)+{
++++val+index+=+list.indexOf(value)
++++this.post+{+this.setSelection(index)+}
}|code-block|syntax|javascript|951648|用法：|951649|spinnerPressure.setItem(resources.getTextArray(R.array.array_pressure),+pressureUnit)|951650|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Here is the Kotlin extension I am using:
<pre><code>fun Spinner.setItem(list: Array&lt;CharSequence&gt;, value: String) {
 val index = list.indexOf(value)
 this.post { this.setSelection(index) }
}
</code></pre>
Usage:
<pre><code>spinnerPressure.setItem(resources.getTextArray(R.array.array_pressure), pressureUnit)
</code></pre>

blocks|key|951673|text|这对我起了作用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|951674|mySpinner.post(new+Runnable()+{
++++@Override
++++public+void+run()+{
++++++++mySpinner.setSelection(position);

++++++++spinnerAdapter.notifyDataSetChanged();
++++}
});|code-block|syntax|javascript|951675|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This Worked For me:
<pre><code>mySpinner.post(new Runnable() {
 @Override
 public void run() {
 mySpinner.setSelection(position);

 spinnerAdapter.notifyDataSetChanged();
 }
});
</code></pre>

blocks|key|705906|text|是的，您可以通过在旋转器的setSelection函数中传递所需的spinner项的索引来实现这一点。例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|705907|spinnerObject.setSelection(INDEX_OF_CATEGORY).|705908|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Yes, you can achieve this by passing the index of the desired spinner item in the setSelection function of spinner. For example:
spinnerObject.setSelection(INDEX_OF_CATEGORY).

blocks|key|705910|text|在Kotlin中，我使用lambda找到了一个简单的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|705911|spinnerObjec.post+{spinnerObjec.setSelection(yourIndex)}|code-block|syntax|javascript|705912|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In Kotlin I found a simple solution using a lambda:
<pre><code>spinnerObjec.post {spinnerObjec.setSelection(yourIndex)}
</code></pre>

I am working on an android project and I am using a spinner which uses an array adapter which is populated from the database. 

I can't find out how I can set the selected item programmatically from the list. For example if, in the spinner I have the following items:

<ul>
<li>Category 1</li>
<li>Category 2</li>
<li>Category 3</li>
</ul>

How would I programmatically make Category 2 the selected item when the screen is created. I was thinking it might be similar to c# I.E Spinner.SelectedText = "Category 2" but there doesn't seem to be any method similar to this for Android.

Set selected item of spinner programmatically

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在处理一个android项目，我使用的是一个旋转器，它使用的是从数据库中填充的数组适配器。我无法找到如何从列表中以编程方式设置所选项目。例如，如果在旋转器中有以下项目：类别1第2类第3类在创建屏幕时，我将如何以编程方式使类别2成为选定的项。我在想，它可能类似于c# I.E . Spinner.SelectedTex...

问以编程方式设置自旋器的选定项
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