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>