安卓开发之Toolbar返回键

布局:

 <android.support.design.widget.AppBarLayout
        android:layout_alignParentTop="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />

    </android.support.design.widget.AppBarLayout>

代码:

public class NavAboutActivity extends AppCompatActivity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_nav_about);
        android.support.v7.widget.Toolbar toolbar=findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);//添加默认的返回图标
        getSupportActionBar().setHomeButtonEnabled(true); //设置返回键可用
    }
}

在清单文件中声明父母Activity(实现返回):

用这种方式有过渡动画,比直接监听按钮后调用finish()的做法自然.

<application ... >
    ...

    <!-- The main/home activity (it has no parent activity) -->

    <activity
        android:name="com.example.myfirstapp.MainActivity" ...>
        ...
    </activity>

    <!-- A child of the main activity -->
    <activity
        android:name="com.example.myfirstapp.MyChildActivity"
        android:label="@string/title_activity_child"
        android:parentActivityName="com.example.myfirstapp.MainActivity" >

        <!-- Parent activity meta-data to support 4.0 and lower -->
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="com.example.myfirstapp.MainActivity" />
    </activity>
</application>

设置返回键为白色:

在style.xml中添加:

<item name="colorControlNormal">@android:color/white</item>

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安卓开发之Toolbar返回键

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