自定义View之简单顶部标题栏

<span style="font-size:18px;"><?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:orientation="horizontal" >
<Button
android:id="@+id/back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="返回"/>
<TextView
android:id="@+id/title"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:gravity="center"
android:text="标题"/>
<Button
android:id="@+id/option"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="操作"/>

</LinearLayout>
</span>

<span style="font-size:18px;">package com.example.my;

import android.content.Context;
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 Title extends LinearLayout{

public Title(Context context, AttributeSet attrs) {
super(context, attrs);
LayoutInflater.from(context).inflate(R.layout.title, this);
Button back=(Button) findViewById(R.id.back);
back.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
Toast.makeText(getContext(), "点击了返回键", Toast.LENGTH_SHORT).show();
}
});
}

}
</span>

<span style="font-size:18px;"><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.my.MainActivity" >

<!-- <include layout="@layout/title"/> -->
<com.example.my.Title
android:layout_width="match_parent"
android:layout_height="wrap_content"/>

</RelativeLayout>
</span>