這一次要實現的是特殊的地步導航欄,如下圖
這裏涉及到幾個知識點,首先這裏我們用到了ImageButton和FloatingActionButton控件,這裏準備了四張圖片作爲按鍵的圖片素材,都用PhotoShop處理成透明背景圖片。
接下來是佈局代碼
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.drw.myapplication.MainActivity" android:background="#DDD"> <android.support.design.widget.FloatingActionButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:layout_marginBottom="10dp" app:fabSize="normal"/> <LinearLayout android:layout_width="match_parent" android:layout_height="70dp" android:layout_alignParentBottom="true" android:orientation="horizontal" android:background="#fff" > <ImageButton android:id="@+id/first" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="3" android:padding="20dp" android:background="@mipmap/first_selected" android:onClick="first" /> <ImageButton android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="2" android:visibility="invisible"/> <ImageButton android:id="@+id/second" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="3" android:padding="20dp" android:background="@mipmap/second_unselected" android:onClick="second"/> </LinearLayout> </RelativeLayout>
FloatingActionButton的大小設置需要創建dimens.xml文件,並輸入如下代碼,這裏的80dp是需要設置的大小,注意這裏是覆蓋了源碼對fabsize=“normal”中normal代表的大小
<?xml version="1.0" encoding="utf-8"?> <resources> <dimen name="design_fab_size_normal">80dp</dimen> </resources>
然後是主類
public class MainActivity extends AppCompatActivity { boolean first_selected=false; boolean second_selected=false; ImageButton first; ImageButton second; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); first=(ImageButton)findViewById(R.id.first); second=(ImageButton)findViewById(R.id.second); } public void first(View v){ if(first_selected==true) return; second.setBackgroundResource(R.mipmap.second_unselected); first.setBackgroundResource(R.mipmap.first_selected); first_selected=true; second_selected=false; } public void second(View v){ if(second_selected==true) return; first.setBackgroundResource(R.mipmap.first_unselected); second.setBackgroundResource(R.mipmap.second_selected); first_selected=false; second_selected=true; } }
好了,這個簡單的例子就到這裏了,我是菜鳥,多多指教。DRW