//Topbar.java文件

package com.example.myview;

import android.content.Context;

import android.content.res.TypedArray;

import android.graphics.drawable.Drawable;

import android.util.AttributeSet;

import android.view.Gravity;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.RelativeLayout;

import android.widget.TextView;

public class Topbar extends RelativeLayout {

private Button leftButton, rightButton;

private TextView tvTitle;

private int leftTextColor;

private Drawable leftBackground;

private String leftText;

private int rightTextColor;

private Drawable rightBackground;

private String rightText;

private float titleTextSize;

private int titleTextColor;

private String title;

private LayoutParams leftParams, rightParams, titleParams;

private topbarClickListener listener;

public interface topbarClickListener {

public void leftClick();

public void rightClick();

}

public void setOnTopbarClickListener(topbarClickListener listener) {

this.listener = listener;

}

public Topbar(Context context, AttributeSet attrs) {

super(context, attrs);

TypedArray ta = context.obtainStyledAttributes(attrs,

R.styleable.Topbar);// ������ֵ�����Ե�ӳ��

// ȡ���Զ�������ֵ

leftTextColor = ta.getColor(R.styleable.Topbar_leftTextColor, 0);

leftBackground = ta.getDrawable(R.styleable.Topbar_leftBackground);

leftText = ta.getString(R.styleable.Topbar_leftText);

rightTextColor = ta.getColor(R.styleable.Topbar_rightTextColor, 0);

rightBackground = ta.getDrawable(R.styleable.Topbar_rightBackground);

rightText = ta.getString(R.styleable.Topbar_rightText);

titleTextSize = ta.getDimension(R.styleable.Topbar_titleTextSize, 0);

titleTextColor = ta.getColor(R.styleable.Topbar_titleTextColor, 0);

title = ta.getString(R.styleable.Topbar_title);

ta.recycle();// ������Դ

leftButton = new Button(context);

rightButton = new Button(context);

tvTitle = new TextView(context);

// �����Ը�ֵ���ؼ�

leftButton.setTextColor(leftTextColor);

leftButton.setBackground(leftBackground);

leftButton.setText(leftText);

rightButton.setTextColor(rightTextColor);

rightButton.setBackground(rightBackground);

rightButton.setText(rightText);

tvTitle.setTextSize(titleTextSize);

tvTitle.setTextColor(titleTextColor);

tvTitle.setText(title);

tvTitle.setGravity(Gravity.CENTER);

setBackgroundColor(0x12321);

leftParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,

LayoutParams.WRAP_CONTENT);// �������

leftParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT, TRUE);

addView(leftButton, leftParams);

rightParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,

LayoutParams.WRAP_CONTENT);// �������

rightParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, TRUE);

addView(rightButton, rightParams);

titleParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,

LayoutParams.MATCH_PARENT);// �������

titleParams.addRule(RelativeLayout.CENTER_IN_PARENT, TRUE);

addView(tvTitle, titleParams);

leftButton.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

listener.leftClick();

}

});

rightButton.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

listener.rightClick();

}

});

}

}

//布局文件

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:customer="http://schemas.android.com/apk/res/com.example.view"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" 

    >

    <TextView 

        android:layout_width="wrap_content"

        android:layout_height="40dp"

        android:layout_marginTop="50dp"

        android:text="@string/app_name"

        android:background="#123432"

        />

<com.example.myview.Topbar

   android:id="@+id/tb"

   android:layout_width="match_parent"

   android:layout_height="40dp"

   customer:leftBackground="#123212"

   customer:leftText="Back"

   customer:leftTextColor="#FFFFFF"

   customer:rightBackground="#abc321"

   customer:rightText="More"

   customer:rightTextColor="#FFFFFF"

   customer:titleTextColor="#123412"

   customer:titleTextSize="10sp"

   customer:title="波波" />

</RelativeLayout>

//atts.xml

<?xml version="1.0" encoding="utf-8"?>

<resources>

    <declare-styleable name="Topbar">

        <attr name="title" format="string"/>

        <attr name="titleTextSize" format="dimension"/>

        <attr name="titleTextColor" format="color"/>

        <attr name="leftTextColor" format="color"/>

        <attr name="leftBackground" format="reference|color"/>

        <attr name="leftText" format="string" />

        <attr name="rightTextColor" format="color"/>

        <!-- reference 引用资源文件 -->

        <attr name="rightBackground" format="reference|color"/>

        <attr name="rightText" format="string" />

    </declare-styleable>

</resources>

代码没报错  但是运行出错。静态时运行没问题，但是加上监听事件就运行出错。