Android Toolbar Three questions: Modify the left arrow color, how to modify the right side and toolbar in the child activity to add a return arrow

1) How to change the color of the small arrow on the left? 2) How to change the color of the three points on the right and how to replace the three points with my own icon?

3) How to make the "trade list" of the 4 words in the center display?

First set theme to Appcompat.noactionbar.

(1) toolbar can be set Setnavigatetionicon, an icon will be passed in to replace the left-most small arrow, but you need to implement its own action.

(2) Add in your own theme definition

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2. <item name="Actionoverflowbuttonstyle"> @style/overflowbuttonstyle</Item >
4. <style name= "overflowbuttonstyle" parent= "@android: Style/widget.actionbutton.overflow ">
8. <item name="android:src"> @drawable/float_button</Item>
10. </Style><pre><code class="Language-text"> You can change those three points. </Code>

(3) It is my personal practice not to use settitle, but to insert a TextView in the toolbar XML definition and then set its layout_gravity to center, which is in the middle.

The other arrow shows the code .

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2. Getsupportactionbar (). Setdisplayhomeasupenabled (True);
4. Want to respond to this return time. In fact, it is onoptionsitemselected () through android.r.id.home monitoring to get
6. <pre name="code" class="java"> @Override
8. public boolean onoptionsitemselected (MenuItem item) {
10. if (item.getitemid () = = Android. R.id.home) {
12. Onbackpressed ();
14. }
16. return true;
18. }

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1. After entering a child activity from the mainactivity, how do you make a return arrow appear to the left of the toolbar and return to the mainactivity after clicking? It's really simple, just two lines of code.
3. Add activity to add the return button to the Androidmanifest.xml in the toolbar property
4. Android:parentactivityname= "Com.example.myfirstapp.MainActivity"

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2. <application ... >
4. ...
6. <!--the main/home activity (it has no parent activity)--
8. <activity
10. android:name="com.example.myfirstapp.MainActivity" ... >
12. ...
14. </Activity>
16. <!--A Child of the main activity--
18. <activity
20. android:name="com.example.myfirstapp.DisplayMessageActivity"
22. android:label="@string/title_activity_display_message"
24. android:parentactivityname="com.example.myfirstapp.MainActivity" >
26. <!--Parent activity Meta-data to support 4.0 and lower-
28. <meta-data
30. android:name="Android.support.PARENT_ACTIVITY"
32. android:value="com.example.myfirstapp.MainActivity" />
34. </Activity>
36. </Application>

And then add a line of code to the program to implement the

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1. @Override
2. public void OnCreate (Bundle savedinstancestate) {
3. ...
4. Getactionbar (). Setdisplayhomeasupenabled (True);
5. }

Android Toolbar Three questions: Modify the left arrow color, how to modify the right side and toolbar in the child activity to add a return arrow