Android工具栏中的自定义图标

Question

I'm trying to use define a custom icon in the support Toolbar but the only icon shown is a left arrow... I tried to set it in the layout and programmatically but the result is the same.

Here is my Activity

public class MainActivity extends ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Toolbar toolbar = (Toolbar) findViewById(R.id.my_toolbar);
    toolbar.setNavigationIcon(R.drawable.ic_launcher);
    toolbar.setTitle("");
    setSupportActionBar(toolbar);
}

And my toolbar layout

<android.support.v7.widget.Toolbar
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/my_toolbar"
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    app:navigationIcon="@drawable/ic_action_bar"
    android:minHeight="@dimen/action_bar_size"
    android:background="?attr/colorPrimary"
    app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
    />

Answer 1

Just tried it myself and the issue seems to be that you have to call setNavigationIcon after setSupportActionBar(toolbar) . Otherwise it'll only show the arrow as you've described.
So to fix this issue just change the code like this:

//...
Toolbar toolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(toolbar);
toolbar.setNavigationIcon(R.drawable.ic_launcher);
toolbar.setTitle("");

Note: Same goes for setting the title, contentDescription etc. I don't know if this a bug or if it is intended, but it's definitely kinda strange.

Answer 2

In case you want to change menu icon . (maybe somebody will need it)

1. In your activity

    @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.menu_info, menu); return true; } 

2. in your menu folder in res. (menu_info.xml)

    <?xml version="1.0" encoding="utf-8"?> <menu xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto"> <item android:id="@+id/menu_info_action" android:icon="@drawable/ic_info_icon" android:title="@string/information" app:showAsAction="ifRoom"/> </menu> 

Answer 3

The current most efficient way to achieve this:

first display the left hand side icon correctly, call this function in onCreateView or onCreate:

protected void enableDisplayHomeAsHome(boolean active) {
    ActionBar actionBar = getSupportActionBar();
    if (actionBar != null) {
        actionBar.setDisplayHomeAsUpEnabled(active); // switch on the left hand icon
        actionBar.setHomeAsUpIndicator(R.drawable.ic_action_home); // replace with your custom icon
    }
}

Now you can intercept this button press in your activity:

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home: {  //index returned when home button pressed
            homeButtonPressed();
            return true;
        }
    }
    return super.onOptionsItemSelected(item);
}

Answer 4

ActionBar.setHomeAsUpIndicator(...);

这个对我有用。