blocks|key|708879|text|只需覆盖下面的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|708880|@Override
++++public+boolean+onOptionsItemSelected(MenuItem+item)+{
++++++++++++switch+(item.getItemId())+{
++++++++++++case+android.R.id.home:
+++++++++++++//do+whatever+you+want+to+do+here.

++++++++++++}
++++++++++++return+true;
++++}|code-block|syntax|javascript|708881|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|$]]

Just override below method. 

<pre><code>@Override
 public boolean onOptionsItemSelected(MenuItem item) {
 switch (item.getItemId()) {
 case android.R.id.home:
 //do whatever you want to do here.

 }
 return true;
 }
</code></pre>

blocks|key|1138709|text|您应该为您的manifest.xml添加元数据，以便进行您想要的活动。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1138710|喜欢|1138711|<activity
++++++++android:name=".Example"
++++++++android:label="@string/Example"
++++++++android:theme="Theme.AppCompat.Light">
++++++++<meta-data
++++++++++++android:name="android.support.PARENT_ACTIVITY"
++++++++++++android:value=".MainActivity"+/>
++++</activity>|code-block|syntax|javascript|1138712|例如，您的代码应该如下所示|1138713|+@Override
+protected+void+onCreate(Bundle+savedInstanceState)+{
+.......
+++++++++getActionBar().setDisplayHomeAsUpEnabled(true);

......
}
@Override
public+boolean+onOptionsItemSelected(MenuItem+item)+{
++++switch+(item.getItemId())+{
++++++++//+Respond+to+the+action+bar's+Up/Home+button
++++++++case+android.R.id.home:
++++++++++++NavUtils.navigateUpFromSameTask(this);
++++++++++++return+true;
++++}
++++return+super.onOptionsItemSelected(item);
}|1138714|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You should add meta data your manifest.xml for which activity you want it

Like 

<pre><code>&lt;activity
 android:name=".Example"
 android:label="@string/Example"
 android:theme="Theme.AppCompat.Light"&gt;
 &lt;meta-data
 android:name="android.support.PARENT_ACTIVITY"
 android:value=".MainActivity" /&gt;
 &lt;/activity&gt;
</code></pre>

and your code should be like this in Example

<pre><code> @Override
 protected void onCreate(Bundle savedInstanceState) {
 .......
 getActionBar().setDisplayHomeAsUpEnabled(true);

......
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
 switch (item.getItemId()) {
 // Respond to the action bar's Up/Home button
 case android.R.id.home:
 NavUtils.navigateUpFromSameTask(this);
 return true;
 }
 return super.onOptionsItemSelected(item);
}
</code></pre>

blocks|key|709800|text|尝试如下:与其使用onOptionsItemSelected来检测搜索更改，不如使用OnQueryTextListener。然后使用back按钮(以及查询文本更改的任何其他时间)调用onQueryTextChanged。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|709801|设置菜单时，将侦听器分配给searchView。当搜索条件发生变化时(在任何键盘上按下搜索按钮除外)，onQueryTextChange都会被调用，当按下后退按钮时，它将被一个空字符串调用。当按下键盘上的搜索按钮时，onQueryTextSubmit将被调用。|709802|@Override
public+boolean+onCreateOptionsMenu(Menu+menu)+{

++++getMenuInflater().inflate(R.menu.main,+menu);

++++final+SearchView+searchView+=+(SearchView)menu.findItem(R.id.action_search).getActionView();
++++searchView.setOnQueryTextListener(new+SearchView.OnQueryTextListener()+{
++++++++@Override
++++++++public+boolean+onQueryTextSubmit(String+s)+{
++++++++++++Log.i(TAG,"onQueryTextSubmit:+"+%2B+s);
++++++++++++searchView.clearFocus();
++++++++++++return+true;
++++++++}

++++++++@Override
++++++++public+boolean+onQueryTextChange(String+s)+{
++++++++++++Log.i(TAG,"onQueryTextChange:+"+%2B+s);
++++++++++++FragmentManager+fragmentManager+=+getSupportFragmentManager();
++++++++++++Fragment+fragment+=+fragmentManager.findFragmentByTag(currentFragmentTag);
++++++++++++if+(fragment.getClass().getName().startsWith("com.mydomain.myapp.mainactivity.MyFragment"))+{
++++++++++++++++if+(s.isEmpty())+{
++++++++++++++++++++((SingleICPListFragment)fragment).clearSearchCriteria();
++++++++++++++++}+else+{
++++++++++++++++++++((SingleICPListFragment)+fragment).applySearchCriteria(s);
++++++++++++++++}
++++++++++++}
++++++++++++return+true;
++++++++}
++++});

++++SearchManager+searchManager+=+(SearchManager)getSystemService(Context.SEARCH_SERVICE);
++++searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));

++++return+true;
}|code-block|syntax|javascript|709803|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Try this: rather than use the onOptionsItemSelected to detect the search change, use an OnQueryTextListener. The onQueryTextChanged will then get called with the back button (and any other time the query text changes).

When you set up your menu, assign the searchView the listener. The onQueryTextChange will get called whenever the search criteria changes (on any keyboard press except the search button), and it will get called with a blank string when the back button is pressed. The onQueryTextSubmit will get called when the search button is pressed on the keyboard.

<pre><code>@Override
public boolean onCreateOptionsMenu(Menu menu) {

 getMenuInflater().inflate(R.menu.main, menu);

 final SearchView searchView = (SearchView)menu.findItem(R.id.action_search).getActionView();
 searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
 @Override
 public boolean onQueryTextSubmit(String s) {
 Log.i(TAG,"onQueryTextSubmit: " + s);
 searchView.clearFocus();
 return true;
 }

 @Override
 public boolean onQueryTextChange(String s) {
 Log.i(TAG,"onQueryTextChange: " + s);
 FragmentManager fragmentManager = getSupportFragmentManager();
 Fragment fragment = fragmentManager.findFragmentByTag(currentFragmentTag);
 if (fragment.getClass().getName().startsWith("com.mydomain.myapp.mainactivity.MyFragment")) {
 if (s.isEmpty()) {
 ((SingleICPListFragment)fragment).clearSearchCriteria();
 } else {
 ((SingleICPListFragment) fragment).applySearchCriteria(s);
 }
 }
 return true;
 }
 });

 SearchManager searchManager = (SearchManager)getSystemService(Context.SEARCH_SERVICE);
 searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));

 return true;
}
</code></pre>

blocks|key|1138756|text|将其放在onCreateOptionsMenu方法上：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1138757|MenuItemCompat.setOnActionExpandListener(menu.findItem(R.id.action_search),+new+MenuItemCompat.OnActionExpandListener()+{
++++@Override
++++public+boolean+onMenuItemActionExpand(MenuItem+item)+{

++++++++return+true;
++++}

++++@Override
++++public+boolean+onMenuItemActionCollapse(MenuItem+item)+{

++++++++//DO+SOMETHING+WHEN+THE+SEARCHVIEW+IS+CLOSING

++++++++return+true;
++++}
});|code-block|syntax|javascript|1138758|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|$]]

Put this on onCreateOptionsMenu method:

<pre><code>MenuItemCompat.setOnActionExpandListener(menu.findItem(R.id.action_search), new MenuItemCompat.OnActionExpandListener() {
 @Override
 public boolean onMenuItemActionExpand(MenuItem item) {

 return true;
 }

 @Override
 public boolean onMenuItemActionCollapse(MenuItem item) {

 //DO SOMETHING WHEN THE SEARCHVIEW IS CLOSING

 return true;
 }
});
</code></pre>

blocks|key|708959|text|可能重复的how+to+override+action+bar+back+button+in+android?|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|708960|无论如何：|708961|Toolbar+toolbar+=+findViewById(R.id.toolbar);
++++++++setSupportActionBar(toolbar);

++++++++getSupportActionBar().setDisplayHomeAsUpEnabled(true);


++++++++toolbar.setNavigationOnClickListener(new+View.OnClickListener()+{
++++++++++++@Override
++++++++++++public+void+onClick(View+v)+{
++++++++++++++++//Do+what+you+want+to+do
++++++++++++}
++++++++});|code-block|syntax|javascript|708962|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/14437745/how-to-override-action-bar-back-button-in-android^0|5|1E|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

Possible duplicate of <a href="https://stackoverflow.com/questions/14437745/how-to-override-action-bar-back-button-in-android">how to override action bar back button in android?</a>

Anyways:

<pre><code>Toolbar toolbar = findViewById(R.id.toolbar);
 setSupportActionBar(toolbar);

 getSupportActionBar().setDisplayHomeAsUpEnabled(true);


 toolbar.setNavigationOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 //Do what you want to do
 }
 });
</code></pre>

I have an action bar containing a <code>searchview</code>. When user click on the search button and collapse the search view the action bar shows a back button on the left side. 

<img src="https://i.stack.imgur.com/InIft.png" alt="enter image description here">

How can we detect when user click on this back button?

Edit

based on the answer I checked my <code>OnOptionsItemSelected</code> but it is not calling too. This is the code of my <code>OnOptionsItemSelected</code>:

<pre><code>@Override
public boolean onOptionsItemSelected(MenuItem item) {

 // Handle action bar item clicks here. The action bar will
 // automatically handle clicks on the Home/Up button, so long
 // as you specify a parent activity in AndroidManifest.xml.
 int id = item.getItemId();

 if (item != null &amp;&amp; id == android.R.id.home) {
 if (mNavigationDrawerFragment.isDrawerOpen(Gravity.RIGHT)) {
 mNavigationDrawerFragment.closeDrawer(Gravity.RIGHT);
 } else {
 mNavigationDrawerFragment.openDrawer(Gravity.RIGHT);

 }
 return true;
 }
 if (id == R.id.action_search) {
 return true;
 }
 return super.onOptionsItemSelected(item);
}
</code></pre>

detecting a click on action bar back button -(OnOptionsItemSelected not calling when click on action bar back button)

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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我有一个包含searchview的动作条。当用户单击搜索按钮并折叠搜索视图时，操作栏在左侧显示一个后退按钮。​​当用户单击“后退”按钮时，我们如何检测？编辑根据答案，我检查了我的OnOptionsItemSelected，但它没有调用。这是我的OnOptionsItemSelected代码@Overridepublic...

问检测到单击动作栏后退按钮-(当单击动作栏后退按钮时，OnOptionsItemSelected没有调用)
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问检测到单击动作栏后退按钮-(当单击动作栏后退按钮时，OnOptionsItemSelected没有调用)EN