blocks|key|4567819|text|尝试使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4567820|ActionBar+ab+=+getSupportActionBar();
ab.setHomeButtonEnabled(true);
ab.setDisplayUseLogoEnabled(true);
ab.setLogo(R.drawable.ic_launcher);|code-block|syntax|javascript|4567821|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|$]]

Try using:

<pre><code>ActionBar ab = getSupportActionBar();
ab.setHomeButtonEnabled(true);
ab.setDisplayUseLogoEnabled(true);
ab.setLogo(R.drawable.ic_launcher);
</code></pre>

blocks|key|61659|text|getSupportActionBar().setDisplayShowHomeEnabled(true);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|61660|随同|unstyled|61661|getSupportActionBar().setIcon(R.drawable.ic_launcher);|61662|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>getSupportActionBar().setDisplayShowHomeEnabled(true);
</code></pre>

along with 

<pre><code>getSupportActionBar().setIcon(R.drawable.ic_launcher);
</code></pre>

blocks|key|4567838|text|这对我很有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4567839|++++getSupportActionBar().setHomeButtonEnabled(true);
++++getSupportActionBar().setDisplayShowHomeEnabled(true);
++++getSupportActionBar().setDisplayUseLogoEnabled(true);
++++getSupportActionBar().setLogo(R.drawable.ic_logo);
++++getSupportActionBar().setDisplayShowTitleEnabled(false);+//optional|code-block|syntax|javascript|4567840|以及：|4567841|++++getSupportActionBar().setHomeButtonEnabled(true);
++++getSupportActionBar().setDisplayShowHomeEnabled(true);
++++getSupportActionBar().setIcon(R.drawable.ic_logo);+//also+displays+wide+logo
++++getSupportActionBar().setDisplayShowTitleEnabled(false);+//optional|4567842|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|$]]

This worked for me:

<pre><code> getSupportActionBar().setHomeButtonEnabled(true);
 getSupportActionBar().setDisplayShowHomeEnabled(true);
 getSupportActionBar().setDisplayUseLogoEnabled(true);
 getSupportActionBar().setLogo(R.drawable.ic_logo);
 getSupportActionBar().setDisplayShowTitleEnabled(false); //optional
</code></pre>

as well as:

<pre><code> getSupportActionBar().setHomeButtonEnabled(true);
 getSupportActionBar().setDisplayShowHomeEnabled(true);
 getSupportActionBar().setIcon(R.drawable.ic_logo); //also displays wide logo
 getSupportActionBar().setDisplayShowTitleEnabled(false); //optional
</code></pre>

blocks|key|61715|text|如果您想要设置主页或后退图标(而不是徽标或静态图标)，则可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|61716|+getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+getSupportActionBar().setHomeAsUpIndicator(+getResources().getDrawable(R.drawable.home)+);|code-block|syntax|javascript|61717|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 want to set the home or back icon (not logo or static icon) so you can use

<pre><code> getSupportActionBar().setDisplayHomeAsUpEnabled(true);
 getSupportActionBar().setHomeAsUpIndicator( getResources().getDrawable(R.drawable.home) );
</code></pre>

blocks|key|4567897|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4567898|import+android.support.v7.app.ActionBar;
import+android.support.v7.app.AppCompatActivity;
...
++++ActionBar+actionbar+=+getSupportActionBar();
++++actionbar.setDisplayHomeAsUpEnabled(true);
++++actionbar.setHomeAsUpIndicator(R.drawable.ic_launcher);

so+your+icon+will+be+used+for+Home+/+back
or

import+android.support.v7.app.ActionBar;
import+android.support.v7.app.AppCompatActivity;
...
++++ActionBar+actionbar+=+getSupportActionBar();
++++actionbar.setDisplayShowHomeEnabled(true);
++++actionbar.setIcon(R.drawable.ic_launcher);|code-block|syntax|javascript|4567899|对于静态图标|4567900|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|$]]

Try this:

<pre><code>import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
...
 ActionBar actionbar = getSupportActionBar();
 actionbar.setDisplayHomeAsUpEnabled(true);
 actionbar.setHomeAsUpIndicator(R.drawable.ic_launcher);

so your icon will be used for Home / back
or

import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
...
 ActionBar actionbar = getSupportActionBar();
 actionbar.setDisplayShowHomeEnabled(true);
 actionbar.setIcon(R.drawable.ic_launcher);
</code></pre>

for static icon

blocks|key|4567922|text|在Xamarin.Android中，您可以使用以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4567923|SupportActionBar.SetHomeButtonEnabled(true);
SupportActionBar.SetDisplayShowHomeEnabled(true);
SupportActionBar.SetDisplayUseLogoEnabled(true);
SupportActionBar.SetIcon(Resource.Drawable.ic_launcher);
SupportActionBar.SetDisplayShowTitleEnabled(false);|code-block|syntax|javascript|4567924|需要使用Android.Support.V7.App.AppCompatActivity。|4567925|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|$]]

In Xamarin.Android you can use these:

<pre><code>SupportActionBar.SetHomeButtonEnabled(true);
SupportActionBar.SetDisplayShowHomeEnabled(true);
SupportActionBar.SetDisplayUseLogoEnabled(true);
SupportActionBar.SetIcon(Resource.Drawable.ic_launcher);
SupportActionBar.SetDisplayShowTitleEnabled(false);
</code></pre>

using Android.Support.V7.App.AppCompatActivity is required.

blocks|key|4567934|text|尝尝这个。对我来说，它起作用了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4567935|getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayUseLogoEnabled(true);|code-block|syntax|javascript|4567936|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|$]]

Try this. For me it worked

<pre><code>getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayUseLogoEnabled(true);
</code></pre>

blocks|key|61802|text|最简单的事情；只需添加：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|61803|app:navigationIcon="@drawable/ic_action_navigation_menu">|code-block|syntax|javascript|61804|添加到<android.support.v7.widget.Toolbar标记|offset|length|style|CODE|61805|其中@drawable/ic_action_navigation_menu是图标的名称|61806|entityMap^0|0|0|3|Y|0|2|Z|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@$I|W|J|X|K|L]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

simplest thing to do; just add:

<pre><code>app:navigationIcon="@drawable/ic_action_navigation_menu"&gt;
</code></pre>

to the <code>&lt;android.support.v7.widget.Toolbar</code> tag

where <code>@drawable/ic_action_navigation_menu</code> is the name of icon

blocks|key|61832|text|对于Actionbar：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|61833|getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeAsUpIndicator(R.drawable.ic_action_back);|code-block|syntax|javascript|61834|对于工具栏：|61835|getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_action_back);|61836|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|$]]

For Actionbar:

<pre><code>getActionBar().setDisplayHomeAsUpEnabled(true);
getActionBar().setHomeAsUpIndicator(R.drawable.ic_action_back);
</code></pre>

For Toolbar:

<pre><code>getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_action_back);
</code></pre>

blocks|key|61850|text|toolbar.setLogo(resize(logo,+(int)+Float.parseFloat(mContext.getResources().getDimension(R.dimen._120sdp)+%2B+""),+(int)+Float.parseFloat(mContext.getResources().getDimension(R.dimen._35sdp)+%2B+"")));


public+Drawable+resize(Drawable+image,+int+width,+int+height)
{
++++Bitmap+b+=+((BitmapDrawable)+image).getBitmap();
++++Bitmap+bitmapResized+=+Bitmap.createScaledBitmap(b,+width,+height,+false);
++++return+new+BitmapDrawable(getResources(),+bitmapResized);
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|61851|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>toolbar.setLogo(resize(logo, (int) Float.parseFloat(mContext.getResources().getDimension(R.dimen._120sdp) + ""), (int) Float.parseFloat(mContext.getResources().getDimension(R.dimen._35sdp) + "")));


public Drawable resize(Drawable image, int width, int height)
{
 Bitmap b = ((BitmapDrawable) image).getBitmap();
 Bitmap bitmapResized = Bitmap.createScaledBitmap(b, width, height, false);
 return new BitmapDrawable(getResources(), bitmapResized);
}
</code></pre>

blocks|key|61864|text|在Kotlin中，我执行了以下操作来显示图标：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|61865|supportActionBar?.setDisplayShowHomeEnabled(true)
supportActionBar?.setIcon(R.drawable.ic_icon_small)|code-block|syntax|javascript|61866|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 did the following to just show the icon:

<pre><code>supportActionBar?.setDisplayShowHomeEnabled(true)
supportActionBar?.setIcon(R.drawable.ic_icon_small)
</code></pre>

I tried these - but still do not see the icon like before:

<pre><code>getSupportActionBar().setLogo(R.drawable.ic_launcher);
getSupportActionBar().setDisplayUseLogoEnabled(true);
getSupportActionBar().setIcon(R.drawable.ic_launcher);
</code></pre>

It seems to work when I use custom toolbar - but that would force me to touch all layouts - is there a better way to do so?

show icon in actionbar/toolbar with AppCompat-v7 21

Android

Xamarin

Kotlin

我试过这些--但还是没有看到像以前那样的图标：getSupportActionBar().setLogo(R.drawable.ic_launcher);getSupportActionBar().setDisplayUseLogoEnabled(true);getSupportActionBar().setIcon(...

问使用AppCompat-v7 21在动作栏/工具栏中显示图标
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