blocks|key|2809600|text|int+upId+=+Resources.getSystem().getIdentifier("up",+"id",+"android");
if+(upId+>+0)+{
++++ImageView+up+=+(ImageView)+findViewById(upId);
++++up.setImageResource(R.drawable.ic_drawer_indicator);
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2809601|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>int upId = Resources.getSystem().getIdentifier("up", "id", "android");
if (upId &gt; 0) {
 ImageView up = (ImageView) findViewById(upId);
 up.setImageResource(R.drawable.ic_drawer_indicator);
}
</code></pre>

blocks|key|3022205|text|@matthias的解决方案并不适用于所有设备，更改homeAsUpIndicator的一个更好的解决方案是在样式中设置为@null，并以编程方式更改徽标资源。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3022206|下面是我来自style.xml的代码|3022207|<style+name="Theme.HomeScreen"+parent="AppBaseTheme">
++<item+name="displayOptions">showHome%7CuseLogo</item>
++<item+name="homeAsUpIndicator">@null</item>
++<item+name="android:homeAsUpIndicator">@null</item>
</style>|code-block|syntax|javascript|3022208|在代码中，您可以使用setLogo()方法更改徽标。|3022209|getSupportActionBar().setLogo(R.drawable.abc_ic_ab_back_holo_light);+//for+ActionBarCompat
getActionBar().setLogo(R.drawable.abc_ic_ab_back_holo_light);+//for+default+actionbar+for+post+3.0+devices|3022210|还要注意，Android+API+18具有以编程方式编辑homeAsUpIndicator的方法refer+documentation。|3022211|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/app/ActionBar.html#setHomeAsUpIndicator%2528android.graphics.drawable.Drawable%2529^0|Q|H|0|0|0|A|9|0|0|5|E|1C|J|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|13|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|14|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|15|8|@$9|16|A|17|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|18|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@$9|1C|A|1D|1|1E]]|E|$]]|$1|S|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]]]

The solution by @matthias doesn't work on all devices, A better solution to change the <code>homeAsUpIndicator</code> is to set it @null in style and change the logo resource programmatically.

Below is my code from style.xml

<pre><code>&lt;style name="Theme.HomeScreen" parent="AppBaseTheme"&gt;
 &lt;item name="displayOptions"&gt;showHome|useLogo&lt;/item&gt;
 &lt;item name="homeAsUpIndicator"&gt;@null&lt;/item&gt;
 &lt;item name="android:homeAsUpIndicator"&gt;@null&lt;/item&gt;
&lt;/style&gt;
</code></pre>

In code you can change the logo using <code>setLogo()</code> method.

<pre><code>getSupportActionBar().setLogo(R.drawable.abc_ic_ab_back_holo_light); //for ActionBarCompat
getActionBar().setLogo(R.drawable.abc_ic_ab_back_holo_light); //for default actionbar for post 3.0 devices
</code></pre>

Also note that the <code>Android API 18</code> has methods to edit the homeAsUpIndicator programatically, <a href="http://developer.android.com/reference/android/app/ActionBar.html#setHomeAsUpIndicator%28android.graphics.drawable.Drawable%29">refer documentation</a>.

blocks|key|2809741|text|这对我很有效|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2809742|getSupportActionBar().setHomeAsUpIndicator(R.drawable.my_home_as_up)|code-block|syntax|javascript|2809743|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>getSupportActionBar().setHomeAsUpIndicator(R.drawable.my_home_as_up)
</code></pre>

blocks|key|3022366|text|尽管this+answer可能会达到预期的行为，正如你可以在它下面的评论中看到的那样：“这个黑客攻击在某些设备上不起作用”。根据Adneal's+answer的说法，我找到了另一种方法，它给了我线索，特别是正确的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3022367|3022368|较低接口:使用id+R.id.up检索相关的ImageView。|unordered-list-item|style|BOLD|CODE|3022369|+>=+14:获取|3022370|ImageView+(android.R.id.up).的相对Parent，并检索第一个子节点，即UpIndicator+API|3022371|然后，此代码片段动态更改UpIndicator：|3022372|if(Build.VERSION.SDK_INT+>=+Build.VERSION_CODES.ICE_CREAM_SANDWICH)+{
++++//+get+the+parent+view+of+home+(app+icon)+imageview
++++ViewGroup+home+=+(ViewGroup)+findViewById(android.R.id.home).getParent();
++++//+get+the+first+child+(up+imageview)
++++(+(ImageView)+home.getChildAt(0)+)
++++++++//+change+the+icon+according+to+your+needs
++++++++.setImageDrawable(getResources().getDrawable(R.drawable.custom_icon_up));
}+else+{
++++//+get+the+up+imageview+directly+with+R.id.up
++++(+(ImageView)+findViewById(R.id.up)+)
++++++++.setImageDrawable(getResources().getDrawable(R.drawable.custom_icon_up));
}++|code-block|syntax|javascript|3022373|我没有在多个设备上测试过(这就是为什么我不确定上面的代码是否适用于所有设备)，但是这在the+update+part+here中提到的API中似乎工作得很好。|3022374|注意:如果不区分高接口和低接口，会得到一个NullPointerException，因为高接口不支持R.id.up，低接口不支持android.R.id.up。|3022375|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/16404232/2668136|1|https://stackoverflow.com/a/23486947/2668136|2|https://stackoverflow.com/q/23486202/2668136^0|2|B|0|1S|F|1|0|0|A|7|M|9|0|0|0|9|V|6|1D|B|B|F|0|C|B|0|0|17|K|2|0|1E|7|1S|F|0^^$0|@$1|2|3|4|5|6|7|1B|8|@]|9|@$A|1C|B|1D|1|1E]|$A|1F|B|1G|1|1H]]|C|$]]|$1|D|3|-4|5|6|7|1I|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|1J|8|@$A|1K|B|1L|H|I]|$A|1M|B|1N|H|J]]|9|@]|C|$]]|$1|K|3|L|5|G|7|1O|8|@]|9|@]|C|$]]|$1|M|3|N|5|6|7|1P|8|@$A|1Q|B|1R|H|J]|$A|1S|B|1T|H|J]|$A|1U|B|1V|H|J]|$A|1W|B|1X|H|I]]|9|@]|C|$]]|$1|O|3|P|5|6|7|1Y|8|@$A|1Z|B|20|H|J]]|9|@]|C|$]]|$1|Q|3|R|5|S|7|21|8|@]|9|@]|C|$T|U]]|$1|V|3|W|5|6|7|22|8|@]|9|@$A|23|B|24|1|25]]|C|$]]|$1|X|3|Y|5|6|7|26|8|@$A|27|B|28|H|J]|$A|29|B|2A|H|J]]|9|@]|C|$]]|$1|Z|3|-4|5|6|7|2B|8|@]|9|@]|C|$]]]|10|$11|$5|12|13|14|C|$15|16]]|17|$5|12|13|14|C|$15|18]]|19|$5|12|13|14|C|$15|1A]]]]

Although <a href="https://stackoverflow.com/a/16404232/2668136">this answer</a> might achieve the expected behaviour, as you can read in the comments below it: "This hack does not work on some devices". I found another way according to <a href="https://stackoverflow.com/a/23486947/2668136">Adneal's answer</a> which gives me the clue and specially the right way to do. 

<ul>
<li>Lower API: use id R.id.up to retrieve the related <code>ImageView</code>. </li>
<li>API >= 14: get the relative <code>Parent</code> of Home <code>ImageView</code> (android.R.id.home) and retrieve the first child which is the <code>UpIndicator</code> (android.R.id.up). </li>
</ul>

Then, this snippet code changes dynamically the <code>UpIndicator</code>: 

<pre><code>if(Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
 // get the parent view of home (app icon) imageview
 ViewGroup home = (ViewGroup) findViewById(android.R.id.home).getParent();
 // get the first child (up imageview)
 ( (ImageView) home.getChildAt(0) )
 // change the icon according to your needs
 .setImageDrawable(getResources().getDrawable(R.drawable.custom_icon_up));
} else {
 // get the up imageview directly with R.id.up
 ( (ImageView) findViewById(R.id.up) )
 .setImageDrawable(getResources().getDrawable(R.drawable.custom_icon_up));
} 
</code></pre>

I have not tested on multiple devices (that's why I'm not sure this above code works for all devices), however this seems to work great in APIs mentioned in <a href="https://stackoverflow.com/q/23486202/2668136">the update part here</a>.

Note: If you don't make the difference between higher and lower APIs, you will get a NullPointerException because <code>R.id.up</code> is not available in higher API while <code>android.R.id.up</code> is not available in lower API.

blocks|key|3022324|text|我为此编写了解决方案。它不是很漂亮，但很有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3022325|public+static+ImageView+getHomeAndUpIndicator(View+decorView)+{
++++ImageView+res+=+null;

++++int+upId+=+Resources.getSystem().getIdentifier("up",+"id",+"android");
++++if+(upId+>+0)+{
++++++++res+=+(ImageView)+decorView.findViewById(upId);
++++}+else+{
++++++++if+(android.os.Build.VERSION.SDK_INT+<=+10)+{
++++++++++++ViewGroup+acbOverlay+=+(ViewGroup)((ViewGroup)decorView).getChildAt(0);
++++++++++++ViewGroup+abcFrame+=+(ViewGroup)acbOverlay.getChildAt(0);
++++++++++++ViewGroup+actionBar+=+(ViewGroup)abcFrame.getChildAt(0);
++++++++++++ViewGroup+abLL+=+(ViewGroup)actionBar.getChildAt(0);
++++++++++++ViewGroup+abLL2+=+(ViewGroup)abLL.getChildAt(1);
++++++++++++res+=+(ImageView)abLL2.getChildAt(0);
++++++++}+else+if+(android.os.Build.VERSION.SDK_INT+>+10+&&+android.os.Build.VERSION.SDK_INT+<+16)+{
++++++++++++ViewGroup+acbOverlay+=+(ViewGroup)((ViewGroup)decorView).getChildAt(0);
++++++++++++ViewGroup+abcFrame+=+(ViewGroup)acbOverlay.getChildAt(0);
++++++++++++ViewGroup+actionBar+=+(ViewGroup)abcFrame.getChildAt(0);
++++++++++++ViewGroup+abLL+=+(ViewGroup)actionBar.getChildAt(1);
++++++++++++res+=+(ImageView)abLL.getChildAt(0);
++++++++}+else+{
++++++++++++ViewGroup+acbOverlay+=+(ViewGroup)((ViewGroup)decorView).getChildAt(0);
++++++++++++ViewGroup+abcFrame+=+(ViewGroup)acbOverlay.getChildAt(1);
++++++++++++ViewGroup+actionBar+=+(ViewGroup)abcFrame.getChildAt(0);
++++++++++++ViewGroup+abLL+=+(ViewGroup)actionBar.getChildAt(0);
++++++++++++ViewGroup+abF+=+(ViewGroup)abLL.getChildAt(0);
++++++++++++res+=+(ImageView)abF.getChildAt(0);
++++++++}
++++}
++++return+res;
}|code-block|syntax|javascript|3022326|作为参数put:+getWindow().getDecorView()|3022327|在少数设备(nexus7+(4.4.2)、三星galaxy+s%2B+(2.3.6)、yaiu+g3+(4.2.2))和安卓2.3.3和4.1.1模拟器上进行测试|3022328|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]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I write solution for this. It's not beautiful but works:

<pre><code>public static ImageView getHomeAndUpIndicator(View decorView) {
 ImageView res = null;

 int upId = Resources.getSystem().getIdentifier("up", "id", "android");
 if (upId &gt; 0) {
 res = (ImageView) decorView.findViewById(upId);
 } else {
 if (android.os.Build.VERSION.SDK_INT &lt;= 10) {
 ViewGroup acbOverlay = (ViewGroup)((ViewGroup)decorView).getChildAt(0);
 ViewGroup abcFrame = (ViewGroup)acbOverlay.getChildAt(0);
 ViewGroup actionBar = (ViewGroup)abcFrame.getChildAt(0);
 ViewGroup abLL = (ViewGroup)actionBar.getChildAt(0);
 ViewGroup abLL2 = (ViewGroup)abLL.getChildAt(1);
 res = (ImageView)abLL2.getChildAt(0);
 } else if (android.os.Build.VERSION.SDK_INT &gt; 10 &amp;&amp; android.os.Build.VERSION.SDK_INT &lt; 16) {
 ViewGroup acbOverlay = (ViewGroup)((ViewGroup)decorView).getChildAt(0);
 ViewGroup abcFrame = (ViewGroup)acbOverlay.getChildAt(0);
 ViewGroup actionBar = (ViewGroup)abcFrame.getChildAt(0);
 ViewGroup abLL = (ViewGroup)actionBar.getChildAt(1);
 res = (ImageView)abLL.getChildAt(0);
 } else {
 ViewGroup acbOverlay = (ViewGroup)((ViewGroup)decorView).getChildAt(0);
 ViewGroup abcFrame = (ViewGroup)acbOverlay.getChildAt(1);
 ViewGroup actionBar = (ViewGroup)abcFrame.getChildAt(0);
 ViewGroup abLL = (ViewGroup)actionBar.getChildAt(0);
 ViewGroup abF = (ViewGroup)abLL.getChildAt(0);
 res = (ImageView)abF.getChildAt(0);
 }
 }
 return res;
}
</code></pre>

As a param put: getWindow().getDecorView()

Test on few devices (nexus 7 (4.4.2), samsung galaxy s+ (2.3.6), yaiu g3 (4.2.2)) and emulators with android 2.3.3 and 4.1.1

blocks|key|189272|text|下面是可用的代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|189273|final+Drawable+upArrow+=+getResources().getDrawable(R.drawable.ic_arrow_back_black_24dp);
++++++++upArrow.setColorFilter(Color.parseColor("#000000"),+PorterDuff.Mode.SRC_ATOP);
++++++++getSupportActionBar().setHomeAsUpIndicator(upArrow);|code-block|syntax|javascript|189274|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|$]]

Here is working code

<pre><code>final Drawable upArrow = getResources().getDrawable(R.drawable.ic_arrow_back_black_24dp);
 upArrow.setColorFilter(Color.parseColor("#000000"), PorterDuff.Mode.SRC_ATOP);
 getSupportActionBar().setHomeAsUpIndicator(upArrow);
</code></pre>

I know how to <a href="https://stackoverflow.com/a/9265774/435605">change the homeAsUpIndicator in the styles xml file</a>. The question is how to change it programmatically.

The reason I want to do it because in some views I support side navigation (sliding menu) - pressing the up/back title button, shows the side menu.

In other views I support the natural up/back botton.

Thus I would like to different indicator icons to indicate the two different logics - side navigation vs. up/back.

Please, lets not argue on the motivation of doing this. That's the given state. Thanks.

How to change home as up resource programmatically?

Android

我知道如何。问题是如何以编程的方式对其进行更改。我之所以要这样做，是因为在一些视图中，我支持侧导航(滑动菜单)--按下up/back标题按钮，就会显示侧菜单。在其他视图中，我支持自然的up/back botton。因此，我想用不同的指示器图标来表示两种不同的逻辑--侧导航与上/后导航。请不要争论这样做的动机。这就是给定的状态。谢谢。

问如何以编程方式将home更改为up资源？
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回答 6

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问如何以编程方式将home更改为up资源？EN

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问如何以编程方式将home更改为up资源？
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