AppCompat v21 support?

[nitrico]

Is there any way to get it working with the new appcompat support library? They introduced many changes on it and I don't find how to solve the problem of getActionBarIconView() always returning null.

[nitrico]

Ok, I managed it by adding a toolbar to the activity layout and setting it as the ActionBar. This toolbar contains an ImageView and a TextView to replace the former ActionBar's icon and title.

[gfucka]

Hi, please can you explain me how you solve it??
I have to add a toolbar in activity_main.xml and then?? How i set it as ActionBar??

Thank you so much

[nitrico]

Sure :) That's what I did:

In TransparentTheme style:

• remove: <item name="homeAsUpIndicator">@drawable/abc_ic_ab_back_holo_dark</item>
• add: <item name="windowActionBar">false</item>

Add this toolbar at the end of the activity_main.xml but inside the main root FrameLayout. Of course you can tweak it:

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="56dp" >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal" >
        <ImageView
            android:id="@+id/icon"
            android:layout_marginLeft="12dp"
            android:layout_marginTop="6dp"
            android:layout_marginBottom="6dp"
            android:layout_width="44dp"
            android:layout_height="44dp" />
        <TextView
            android:id="@+id/title"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center_vertical"
            style="@style/TextAppearance.AppCompat.Widget.ActionBar.Title" />
    </LinearLayout>
</android.support.v7.widget.Toolbar>

Then, in the MainActivity.java:

• Add this attributes:

  private Toolbar toolbar;
  private TextView title;
  private ImageView icon;
  

• In onCreate method, after setContentView, add:

  toolbar = (Toolbar) findViewById(R.id.toolbar);
  setSupportActionBar(toolbar);
  icon = (ImageView) findViewById(R.id.icon);
  title = (TextView) findViewById(R.id.title);
  

• Replace getActionBarIconView method with this one:

  private ImageView getActionBarIconView() {
      return icon;
  }
  

• Replace setTitleAlpha method with this one:

  private void setTitleAlpha(float alpha) {
      mAlphaForegroundColorSpan.setAlpha(alpha);
      mSpannableString.setSpan(mAlphaForegroundColorSpan, 0, mSpannableString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
      title.setText(mSpannableString);
  }
  

And I think that's all.

[gfucka]

Hi, I do all but now I have NullPointerException on line 156 of MainActivity
float scaleY = 1.0F + interpolation * (mRect2.height() / mRect1.height() - 1.0F);

why??

Thanks again

[nitrico]

Hmm... don't know why. I have made all the modifications again, thinking I could forget anything but it just works fine for me. You can post the trace of the exception to try to find the problem.

[jigar-sp]

thanks...

its perfectly working

[ed-george]

Thank you @nitrico, I can also confirm that this work around does rectify the issues with AppCompat v21

[cjgehinscott]

I can confirm that this fix does not work anymore...

07-07 09:56:15.633 3430-3430/com.bah.is.esd.zoneapp E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.bah.is.esd.zoneapp, PID: 3430
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.bah.is.esd.zoneapp/com.bah.is.esd.zoneapp.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setAlpha(float)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setAlpha(float)' on a null object reference
at com.bah.is.esd.nineoldandroids.view.ViewHelper$Honeycomb.setAlpha(ViewHelper.java:185)
at com.bah.is.esd.nineoldandroids.view.ViewHelper.setAlpha(ViewHelper.java:19)
at com.bah.is.esd.zoneapp.MainActivity.layoutView(MainActivity.java:525)
at com.bah.is.esd.zoneapp.MainActivity.onCreate(MainActivity.java:135)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
            at android.app.ActivityThread.access$800(ActivityThread.java:151)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5254)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

[cjgehinscott]

Make your theme a child of Theme.AppCompat.Light.NoActionBar like so: