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本篇文章為大家展示了Android中怎么利用組合控件復用布局,內容簡明扼要并且容易理解,絕對能使你眼前一亮,通過這篇文章的詳細介紹希望你能有所收獲。
首先,我們需要寫出布局文件layout_custom_titlebar.xml。
<?xml version="1.0" encoding="utf-8"?> <merge xmlns:android="http://schemas.android.com/apk/res/android"> <!-- 使用merge標簽減少層級 --> <Button android:id="@+id/title_bar_left" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_centerVertical="true" android:layout_marginLeft="5dp" android:background="@null" android:minHeight="45dp" android:minWidth="45dp" android:textSize="14sp" /> <TextView android:id="@+id/title_bar_title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:singleLine="true" android:textSize="17sp" /> <Button android:id="@+id/title_bar_right" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_centerVertical="true" android:layout_marginRight="7dp" android:background="@null" android:minHeight="45dp" android:minWidth="45dp" android:textSize="14sp" /> </merge>
2.定義自定義屬性
<declare-styleable name="CustomTitleBar"> <!--標題欄背景色--> <attr name="title_background_color" format="reference|integer" /> <!--左邊按鈕是否可見--> <attr name="left_button_visible" format="boolean" /> <!--右邊按鈕是否可見--> <attr name="right_button_visible" format="boolean" /> <!--標題文字--> <attr name="title_text" format="string" /> <!--標題文字顏色--> <attr name="title_text_color" format="color" /> <!--標題文字圖標--> <attr name="title_text_drawable" format="reference|integer" /> <!--左邊按鈕文字--> <attr name="left_button_text" format="string" /> <!--左邊按鈕文字顏色--> <attr name="left_button_text_color" format="color" /> <!--左邊按鈕圖標--> <attr name="left_button_drawable" format="reference|integer" /> <!--右邊按鈕文字--> <attr name="right_button_text" format="string" /> <!--右邊按鈕文字顏色--> <attr name="right_button_text_color" format="color" /> <!--右邊按鈕圖標--> <attr name="right_button_drawable" format="reference|integer" /> </declare-styleable>
3.自定義一個View繼承ViewGroup子類,這里我們繼承RelativeLayout。
public class CustomTitleBar extends RelativeLayout { private Button titleBarLeftBtn; private Button titleBarRightBtn; private TextView titleBarTitle; public CustomTitleBar(Context context) { super(context); } public CustomTitleBar(Context context, AttributeSet attrs) { super(context, attrs); LayoutInflater.from(context).inflate(R.layout.layout_custom_titlebar,this,true); titleBarLeftBtn = (Button) findViewById(R.id.title_bar_left); titleBarRightBtn = (Button) findViewById(R.id.title_bar_right); titleBarTitle = (TextView) findViewById(R.id.title_bar_title); TypedArray typedArray=context.obtainStyledAttributes(attrs,R.styleable.CustomTitleBar); if(typedArray!=null){ //titleBar背景色 int titleBarBackGround=typedArray.getResourceId(R.styleable.CustomTitleBar_title_background_color, Color.BLUE); setBackgroundColor(titleBarBackGround); //獲取是否要顯示左邊按鈕 boolean leftButtonVisible = typedArray.getBoolean(R.styleable.CustomTitleBar_left_button_visible, true); if (leftButtonVisible) { titleBarLeftBtn.setVisibility(View.VISIBLE); } else { titleBarLeftBtn.setVisibility(View.INVISIBLE); } //設置左邊按鈕的文字 String leftButtonText = typedArray.getString(R.styleable.CustomTitleBar_left_button_text); if (!TextUtils.isEmpty(leftButtonText)) { titleBarLeftBtn.setText(leftButtonText); //設置左邊按鈕文字顏色 int leftButtonTextColor = typedArray.getColor(R.styleable.CustomTitleBar_left_button_text_color, Color.WHITE); titleBarLeftBtn.setTextColor(leftButtonTextColor); } else { //設置左邊圖片icon 這里是二選一 要么只能是文字 要么只能是圖片 int leftButtonDrawable = typedArray.getResourceId(R.styleable.CustomTitleBar_left_button_drawable, R.mipmap.titlebar_back_icon); if (leftButtonDrawable != -1) { titleBarLeftBtn.setBackgroundResource(leftButtonDrawable); } } //先獲取標題是否要顯示圖片icon int titleTextDrawable = typedArray.getResourceId(R.styleable.CustomTitleBar_title_text_drawable, -1); if (titleTextDrawable != -1) { titleBarTitle.setBackgroundResource(titleTextDrawable); } else { //如果不是圖片標題 則獲取文字標題 String titleText = typedArray.getString(R.styleable.CustomTitleBar_title_text); if (!TextUtils.isEmpty(titleText)) { titleBarTitle.setText(titleText); } //獲取標題顯示顏色 int titleTextColor = typedArray.getColor(R.styleable.CustomTitleBar_title_text_color, Color.WHITE); titleBarTitle.setTextColor(titleTextColor); } //獲取是否要顯示右邊按鈕 boolean rightButtonVisible = typedArray.getBoolean(R.styleable.CustomTitleBar_right_button_visible, true); if (rightButtonVisible) { titleBarRightBtn.setVisibility(View.VISIBLE); } else { titleBarRightBtn.setVisibility(View.INVISIBLE); } //設置右邊按鈕的文字 String rightButtonText = typedArray.getString(R.styleable.CustomTitleBar_right_button_text); if (!TextUtils.isEmpty(rightButtonText)) { titleBarRightBtn.setText(rightButtonText); //設置右邊按鈕文字顏色 int rightButtonTextColor = typedArray.getColor(R.styleable.CustomTitleBar_right_button_text_color, Color.BLUE); titleBarRightBtn.setTextColor(rightButtonTextColor); } else { //設置右邊圖片icon 這里是二選一 要么只能是文字 要么只能是圖片 int rightButtonDrawable = typedArray.getResourceId(R.styleable.CustomTitleBar_right_button_drawable, -1); if (rightButtonDrawable != -1) { titleBarRightBtn.setBackgroundResource(rightButtonDrawable); } } typedArray.recycle(); } } public void setTitleClickListener(OnClickListener onClickListener) { if (onClickListener != null) { titleBarLeftBtn.setOnClickListener(onClickListener); titleBarRightBtn.setOnClickListener(onClickListener); } } public Button getTitleBarLeftBtn() { return titleBarLeftBtn; } public Button getTitleBarRightBtn() { return titleBarRightBtn; } public TextView getTitleBarTitle() { return titleBarTitle; } }
4.正確地使用它
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <com.mumubin.demoproject.view.CustomTitleBar android:id="@+id/ctb_view" android:layout_width="match_parent" android:layout_height="45dp" app:right_button_drawable="@mipmap/sure" app:title_text="@string/app_name" /> <com.mumubin.demoproject.view.CustomTitleBar android:layout_width="match_parent" android:layout_height="45dp" android:layout_marginTop="4dp" app:title_background_color="@color/colorPrimary" app:title_text="@string/app_name" app:title_text_color="@color/colorAccent" app:left_button_text="左邊" app:right_button_text="右邊"/> <com.mumubin.demoproject.view.CustomTitleBar android:layout_width="match_parent" android:layout_height="45dp" android:layout_marginTop="4dp" app:title_text_drawable="@mipmap/ic_launcher" app:title_background_color="@color/colorAccent" app:left_button_text="左邊" app:right_button_text="右邊"/> </LinearLayout>
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