• 继承Toolbar

public class MyToolBar extends Toolbar {

    private EditText mSearch_view;
    private TextView mToolbar_title;
    private Button mRight_button;
    private LayoutInflater mInflater;
    private View mView;

    public MyToolBar(Context context) {
        this(context, null);
    }

    public MyToolBar(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public MyToolBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        initView();
        //设置边距
        setContentInsetsRelative(10, 10);

        //读取自定义的属性attrs文件
        final TintTypedArray mTypeArray = TintTypedArray.obtainStyledAttributes(getContext(),
                attrs,
                R.styleable.MyToolBar,
                defStyleAttr,0);
        //获取自定义属性
        final Drawable rightbutton = mTypeArray.getDrawable(R.styleable.MyToolBar_RightButton);
        //设置右上角按钮图标
        if (rightbutton != null) {
            setRightButtonIcon(rightbutton);
        }

        //设置右上角按钮的文字
        final CharSequence rightText = mTypeArray.getText(R.styleable.MyToolBar_rightButtonText);
        if (rightText != null){
            setRightButtonText(rightText);
        }

        //设置显示空件
        boolean isShowSearchView = mTypeArray.getBoolean(R.styleable.MyToolBar_isShowSearchView, false);
        if (isShowSearchView) {
            showSearchView();
            hideRightButtonView();
            hideTitleView();
        } else {
            showTitleView();
            showRightButtonView();
            hideSearchView();
        }

        //回收设置属性
        mTypeArray.recycle();
    }

    private void initView() {
        if (mView == null) {
            mInflater = LayoutInflater.from(getContext());
            mView = mInflater.inflate(R.layout.toolbar, null);

            mSearch_view = (EditText) mView.findViewById(R.id.search_edit);
            mToolbar_title = (TextView) mView.findViewById(R.id.toolbar_title);
            mRight_button = (Button) mView.findViewById(R.id.toolbar_right_button);

            //设置toolbar在父容器的布局
            LayoutParams lp = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT, Gravity.CENTER_HORIZONTAL);

            //加载视图到父视图
            addView(mView,lp);

        }

    }

    //设置按钮监听事件
    public void setRightButtonClickListener(OnClickListener listener) {
        mRight_button.setOnClickListener(listener);
    }

    //调用此方法传入资源ID，然后调用父类的setTitle设置标题
    @Override
    public void setTitle(@StringRes int resId) {
        setTitle(getContext().getText(resId));
    }

    @Override
    public void setTitle(CharSequence title) {
        initView();
        if (mToolbar_title != null) {
            mToolbar_title.setText(title);
            showTitleView();
        }
    }

    public void showTitleView() {
        if (mToolbar_title != null) {
            mToolbar_title.setVisibility(VISIBLE);
        }
    }

    public void hideTitleView() {
        if (mToolbar_title != null) {
            mToolbar_title.setVisibility(GONE);
        }
    }

    public void showRightButtonView() {
        if (mRight_button != null) {
            mRight_button.setVisibility(VISIBLE);
        }
    }

    public void hideRightButtonView() {
        if (mRight_button != null) {
            mRight_button.setVisibility(GONE);
        }
    }

    public void showSearchView() {
        if (mSearch_view != null) {
            mSearch_view.setVisibility(VISIBLE);
        }
    }

    public void hideSearchView() {
        if (mSearch_view != null) {
            mSearch_view.setVisibility(GONE);
        }
    }

    //设置右上角图标的函数
    public void  setRightButtonIcon(int icon){

        setRightButtonIcon(ContextCompat.getDrawable(getContext(),icon));
    }

    public void setRightButtonIcon(Drawable rightButtonIcon) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            mRight_button.setBackground(rightButtonIcon);
        }
        mRight_button.setVisibility(VISIBLE);
    }

    //设置右上角按钮文字
    public void setRightButtonText(CharSequence text){
        mRight_button.setText(text);
        mRight_button.setVisibility(VISIBLE);
    }

    public void setRightButtonText(int id){
        setRightButtonText(getResources().getString(id));
    }
    //获取按钮实例
    public Button getRightButton(){
        return this.mRight_button;
    }
}

• 创建布局文件Toolbar.xml

<?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="wrap_content">
    <!--搜索框-->
    <EditText 
        android:id="@+id/search_edit"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:drawableLeft="@mipmap/icon_search"
        android:layout_margin="5dp"
        android:hint="@string/seach_edit_hint"
        android:gravity="center"
        style="@style/search_view"
        android:visibility="gone"
        />
    <!--居中的Title-->
    <TextView
        android:id="@+id/toolbar_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_centerInParent="true"
        android:text="主页"
        android:visibility="gone"
        android:textColor="@color/white"
        android:textSize="@dimen/toolbar_title"
        />
    <!--右上角的按钮-->
    <Button
        android:id="@+id/toolbar_right_button"
        android:layout_width="25dp"
        android:layout_height="25dp"
        android:layout_marginRight="13dp"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:visibility="gone"
        />
</RelativeLayout>

• 创建自定义属性

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="MyToolBar">
        <attr name="RightButton" format="reference"/>
        <attr name="isShowSearchView" format="boolean"/>
        <attr name="rightButtonText" format="string"/>
    </declare-styleable>
</resources>

• 使用，在主布局里添加控件

<news.huoren.com.myshop.widget.MyToolBar
        android:id="@+id/tab_home_toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:isShowSearchView="true"
        />