在开发中，经常会遇到很多控件用在一起，并且用在很多地方，造成布局文件看起来很乱，当然我们可以用include，merge，viewStub标签来优化标签。本文采用自定义控件的方式来优化
-
自定义view的组合控件首先需要继承ViewGroup或者它的子类，如LineatLayout，RelativeLauout，FrameLayout等。
public class MenuItemLayout extends FrameLayout -
重写构造函数
public MenuItemLayout(Context context) { this(context,null); } public MenuItemLayout( Context context, AttributeSet attrs) { this(context,attrs,0); } public MenuItemLayout( Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context,attrs); }一般实现前两个构造函数就可以了，第一个构造函数只能在的意思是只能在代码中添加，第二个的可以在代码和xml中添加，第三个是在view有主题属性的时候使用
-
当我们重写完构造函数之后，接下来要做的就是加载我们要的布局，这个布局就是我们要组合起来的控件
LayoutInflater inflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); mView = inflater.inflate(R.layout.menu_item_layout, this, true);加载完布局之后，直接找我们需要的控件就可以了
titleTv = (TextView) findViewById(R.id.menu_item_text); -
给控件赋值有两种方式，①是通过xml中指定，我们取值，然后赋值给相应的控件。②在代码中我们写一个public方法，提供给外界调用，用来改变控件的值，这里我我合并这一种
-
通过xml赋值的话，我们需要写一个控件的属性集合，在value下面新建一个attrs.xml文件，在attrs文件里声明我们需要的属性
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="MenuItemLayout"> <attr name="title_text" format="string"/> <attr name="hint_text" format="string"/> <attr name="icon_reference" format="reference"/> <attr name="icon_uri" format="string"/> <attr name="jump_url" format="string"/> <attr name="divider_line_style" format="integer"/> </declare-styleable> </resources>name属性可以随便写(当然要有意义)，format是这个attr的数据类型。写完这个之后我们可以在我们的组合控件里获取这些属性的值，然后赋值给相应的控件。
TypedArray a = mContext.obtainStyledAttributes(attrs, R.styleable.MenuItemLayout); //获取属性的值 a.getString(R.styleable.MenuItemLayout_title_text) setTitleText(a.getString(R.styleable.MenuItemLayout_title_text));//既可以在代码里调用给控件赋值，又可以通过给xml里的属性给控件赋值 public void setTitleText(String titleText) { if (!TextUtils.isEmpty(titleText)){ this.titleText = titleText; titleTv.setText(titleText); } }完整代码
public class MenuItemLayout extends FrameLayout { private Context mContext; private View mView; private TextView titleTv, hintTv; private ImageView iconImg,redHintImg; private String titleText,hintText,jumpUrl,onclickId; private int iconImageId; public static final int NO_LINE = 0; public static final int DIVIDE_LINE = 1; public static final int DIVIDE_AREA = 2; private int divideLineStyle = NO_LINE; private boolean isShowRedHintImg; public boolean isShowRedHintImg() { return isShowRedHintImg; } public void setShowRedHintImg(boolean showRedHintImg) { isShowRedHintImg = showRedHintImg; redHintImg.setVisibility(showRedHintImg ? VISIBLE : GONE); } public String getJumpUrl() { return jumpUrl; } private void setJumpUrl(String jumpUrl) { if (!TextUtils.isEmpty(jumpUrl)){ this.jumpUrl = jumpUrl; } } public int getIconImageId() { return iconImageId; } private void setIconImageId(int iconImageId) { if (iconImageId != 10000){ this.iconImageId = iconImageId; iconImg.setImageResource(iconImageId); } } public String getHintText() { return hintText; } private void setHintText(String hintText) { if (!TextUtils.isEmpty(hintText)){ this.hintText = hintText; hintTv.setText(hintText); } } public String getTitleText() { return titleText; } public void setTitleText(String titleText) { if (!TextUtils.isEmpty(titleText)){ this.titleText = titleText; titleTv.setText(titleText); } } public String getOnclickId() { return onclickId; } public void setOnclickId(String onclickId) { this.onclickId = onclickId; } public MenuItemLayout(Context context) { this(context,null); } public MenuItemLayout( Context context, AttributeSet attrs) { this(context,attrs,0); } public MenuItemLayout( Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(context,attrs); } private void init(Context context, AttributeSet attrs) { this.mContext = context; LayoutInflater inflater = (LayoutInflater)mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE); mView = inflater.inflate(R.layout.menu_item_layout, this, true); titleTv = (TextView) findViewById(R.id.menu_item_text); hintTv = (TextView) findViewById(R.id.menu_item_text_hint); iconImg = (ImageView) findViewById(R.id.menu_item_icon_img); redHintImg = (ImageView) findViewById(R.id.menu_item_red_hint); TypedArray a = mContext.obtainStyledAttributes(attrs,R.styleable.MenuItemLayout); setTitleText(a.getString(R.styleable.MenuItemLayout_title_text)); setHintText(a.getString(R.styleable.MenuItemLayout_hint_text)); setIconImageId(a.getResourceId(R.styleable.MenuItemLayout_icon_reference,10000)); setJumpUrl(a.getString(R.styleable.MenuItemLayout_jump_url)); divideLineStyle = a.getInt(R.styleable.MenuItemLayout_divider_line_style, NO_LINE); setDivideLine(divideLineStyle); a.recycle(); } private void setDivideLine(int bottomLineStyle) { View lineView = findViewById(R.id.divider_line_view); View areaView = findViewById(R.id.divider_area_view); lineView.setVisibility(GONE); areaView.setVisibility(GONE); if (bottomLineStyle == DIVIDE_LINE){ lineView.setVisibility(VISIBLE); }else if (bottomLineStyle == DIVIDE_AREA){ areaView.setVisibility(VISIBLE); } } public TextView getTitleTv() { return titleTv; } public TextView getHintTv() { return hintTv; } }布局文件
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/menu_item_layout" android:orientation="vertical" android:background="@android:color/white" android:layout_width="match_parent" android:layout_height="wrap_content"> <View android:id="@+id/divider_line_view" android:layout_width="match_parent" android:layout_height="@dimen/dp_0_5" android:layout_marginLeft="@dimen/dp_50" android:background="@color/divider" android:visibility="gone"/> <View android:id="@+id/divider_area_view" android:layout_width="match_parent" android:layout_height="@dimen/dp_10" android:background="@color/main_bg"/> <LinearLayout android:layout_width="match_parent" android:layout_height="@dimen/dp_50" android:gravity="center_vertical" android:orientation="horizontal" android:paddingLeft="@dimen/dp_15" android:paddingRight="@dimen/dp_15"> <ImageView android:id="@+id/menu_item_icon_img" android:layout_width="@dimen/dp_24" android:layout_height="@dimen/dp_24" /> <TextView android:id="@+id/menu_item_text" android:layout_width="@dimen/dp_0" android:layout_weight="1" android:layout_height="wrap_content" android:layout_marginLeft="@dimen/dp_10" android:gravity="center_vertical" android:textSize="@dimen/sp_15" android:text="标题文字"/> <TextView android:id="@+id/menu_item_text_hint" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="@color/divider" android:textSize="@dimen/sp_13" android:layout_marginRight="@dimen/dp_10" android:text="提示文字"/> <ImageView android:id="@+id/menu_item_red_hint" android:layout_width="@dimen/dp_10" android:layout_height="@dimen/dp_10" android:layout_marginRight="@dimen/dp_10" android:visibility="gone"/> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@mipmap/my_return"/> </LinearLayout> </LinearLayout>属性集合
<?xml version="1.0" encoding="utf-8"?> <resources> <declare-styleable name="MenuItemLayout"> <attr name="title_text" format="string"/> <attr name="hint_text" format="string"/> <attr name="icon_reference" format="reference"/> <attr name="icon_uri" format="string"/> <attr name="jump_url" format="string"/> <attr name="divider_line_style" format="integer"/> </declare-styleable> </resources>
-
