自定义一个 导航栏，仿 iOS 界面：

创建一个 layout_title.xml :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#cc9900">

    <Button
        android:id="@+id/title_back"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_margin="5dp"
        android:text="Back"
        android:textColor="#fff"
        android:background="#cc0099"/>

    <TextView
        android:id="@+id/title_text"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_weight="1"
        android:gravity="center"
        android:text="Title Text"
        android:textColor="#fff"
        android:textSize="24sp"/>

    <Button
        android:id="@+id/title_edit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_margin="5dp"
        android:text="Edit"
        android:textColor="#fff"
        android:background="#ee00ff"/>

</LinearLayout>

引入到 activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <include layout="@layout/layout_title" />
    
</LinearLayout>

通过 include 语句引入。

在 MainActivity.java 隐藏系统自带的标题栏：

import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        ActionBar actionBar = getSupportActionBar();
        if (actionBar != null) {
            actionBar.hide();
        }
    }
}

自定义控件：
TitleLayout.java:

import android.app.Activity;
import android.content.Context;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Toast;

public class TitleLayout extends LinearLayout {

    public Button titleBack;

    public Button titleEdit;

    public TitleLayout(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);

        LayoutInflater.from(context).inflate(R.layout.layout_title, this);

        titleBack = findViewById(R.id.title_back);
        titleEdit = findViewById(R.id.title_edit);

        titleBack.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                ((Activity)getContext()).finish();
            }
        });

        titleEdit.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getContext(),"You clicked Edit button", Toast.LENGTH_SHORT).show();
            }
        });

    }
}

引入到 activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <com.example.muzico.learnandroid03.TitleLayout
        android:id="@+id/titleLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

............................大致是这样吧。