Android開發(fā)在保證性能的前提下，UI必須要酷酷的可以為你的應(yīng)用加分不少，自定義View的方法中組合控件是經(jīng)常會用到的，所謂自定義都是有套路。

下面以創(chuàng)建常見的TitleBar為例講一下實(shí)現(xiàn)流程~

先上效果圖（很簡單）：

shortcut.jpg

步驟：

• 第一步：自定義布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent" 
     android:layout_height="@dimen/titleBarView_height" 
     android:paddingEnd="5dp" 
     android:gravity="center_vertical" 
     android:background="@android:color/holo_blue_light">   

 <ImageButton        
    android:id="@+id/titleBar_leftMenu"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"  
    android:layout_alignParentLeft="true"  
    android:layout_marginStart="-10dp"  
 />    
<TextView 
      android:id="@+id/titleBar_title"  
      android:layout_width="wrap_content"  
      android:layout_height="wrap_content" 
      android:layout_centerInParent="true" 
      android:gravity="center"   
      android:textColor="@color/white"  
      android:textSize="@dimen/titleBarView_titleSize" 
       />   

 <ImageButton  
      android:id="@+id/titleBar_rightMenu"  
      android:layout_width="wrap_content"   
      android:layout_height="wrap_content" 
      android:layout_alignParentEnd="true"
        />
</RelativeLayout>

• 第二步：聲明自定義屬性

如果對自定義屬性不熟悉可參考《手摸手教你自定義UI之__自定義控件屬性》

<?xml version="1.0" encoding="utf-8"?><resources>
    <declare-styleable name="TitleBarView" > 
       <attr name="titleName" format="reference|string"/>
       <attr name="leftMenuSrc" format="reference|integer"/>
       <attr name="rightMenuSrc" format="reference|integer"/>
       <attr name="leftMenuVisible" format="boolean"/> 
       <attr name="rightMenuVisible" format="boolean"/>
    </declare-styleable></resources>

• 第三步：代碼邏輯實(shí)現(xiàn)

package com.dailymanager.smartarvin.view;
 
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageButton;
import android.widget.RelativeLayout;
import android.widget.TextView;
 
import com.dailymanager.smartarvin.dailymanager.R;
 
/**
 * Todo：自定義TitleBar組合控件
 * Author：Arvin
 * Date：2016/11/12 22:38
 * Email：smartarvin199111@gmail.com
 */
 
public class TitleBarView extends RelativeLayout {
 
    private Context mContext ;
    private OnMenuClickListener mMenuClickListener ;
 
    private int titleResId ;
    private int leftMenuSrcId ;
    private int rightMenuSrcId ;
    private boolean leftMenuVisible = true ;
    private boolean rightMenuVisible = true;
 
    private ImageButton leftMenu ;
    private TextView title ;
    private ImageButton rightMenu ;
 
    public TitleBarView(Context context) {
        this(context , null);
    }
 
    public TitleBarView(Context context , AttributeSet attrs) {
        super(context , attrs );
        mContext = context ;
        findViews();
        initDefaultStyle(context , attrs);
    }
 
 
    private void findViews() {
        LayoutInflater.from(mContext).inflate(R.layout.view_titlebar, this, true);
        leftMenu = (ImageButton) findViewById(R.id.titleBar_leftMenu);
        title = (TextView) findViewById(R.id.titleBar_title);
        rightMenu = (ImageButton) findViewById(R.id.titleBar_rightMenu);
 
        leftMenu.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                if (mMenuClickListener != null) {
                    mMenuClickListener.onLeftMenuClick();
                }
            }
        });
 
        rightMenu.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                if (mMenuClickListener != null) {
                    mMenuClickListener.onRightMenuClick();
                }
            }
        });
    }
 
    /**
    * 初始化原始屬性
    * params: Context
    * return: void
    * throw: null
    */
    private void initDefaultStyle(Context context , AttributeSet attrs){
        TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.TitleBarView);
        titleResId = a.getResourceId(R.styleable.TitleBarView_titleName , R.string.app_name);
        leftMenuSrcId = a.getResourceId(R.styleable.TitleBarView_leftMenuSrc , R.mipmap.ic_launcher);
        rightMenuSrcId = a.getResourceId(R.styleable.TitleBarView_rightMenuSrc , R.mipmap.ic_launcher);
        leftMenuVisible = a.getBoolean(R.styleable.TitleBarView_leftMenuVisible , true);
        rightMenuVisible = a.getBoolean(R.styleable.TitleBarView_rightMenuVisible , true);
        a.recycle();
 
        title.setText(titleResId);
        leftMenu.setBackgroundResource(leftMenuSrcId);
        rightMenu.setBackgroundResource(rightMenuSrcId);
        leftMenu.setVisibility(leftMenuVisible ? View.VISIBLE : View.GONE);
        rightMenu.setVisibility(rightMenuVisible ? View.VISIBLE : View.GONE);
    }
 
    public void setOnMenuClickListener(OnMenuClickListener mMenuClickListener) {
        this.mMenuClickListener = mMenuClickListener;
    }
 
    /**
      * 自定義監(jiān)聽器回調(diào)接口
      * params: null
      * return: null
      * throw: null 
      */
    public interface OnMenuClickListener {
        void onLeftMenuClick();
        void onRightMenuClick();
    }
}

• 第四步：控件使用
• XML中引用

<com.dailymanager.smartarvin.view.TitleBarView  
    android:id="@+id/home_titleBar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    apps:titleName="@string/app_name" 
    apps:leftMenuSrc="@mipmap/menu" 
    apps:rightMenuSrc="@mipmap/more"
    apps:leftMenuVisible="true"
    apps:rightMenuVisible="true"
    />

• 代碼中使用

private void findViews() { 
       mTitleBarView = (TitleBarView) findViewById(R.id.home_titleBar);   
       mTitleBarView.setOnMenuClickListener(new     
       TitleBarView.OnMenuClickListener() {
        @Override
        public void onLeftMenuClick() {  
          Toast.makeText(HomeActivity.this, "Left" , Toast.LENGTH_SHORT).show();        
        } 

       @Override
        public void onRightMenuClick() {
            Toast.makeText(HomeActivity.this, "Right" , Toast.LENGTH_SHORT).show();       
         }    
      });
}

自定義組合控件很簡單，不用執(zhí)行重復(fù)繪制view等復(fù)雜邏輯，對于應(yīng)用中會多次重復(fù)使用的控件可以使用該方法。

謹(jǐn)以作為開發(fā)記錄，如果有幫到您，記得點(diǎn)贊哦