<declare-styleable name="titleBar">
  <attr name="title" format="string" />
  <attr name="titleTextSize" format="dimension" />
  <attr name="titleTextColor" format="color" />
  <attr name="titleLeftText" format="string" />
  <attr name="titleLeftBackground" format="color|reference" />
  <attr name="titleLeftTextColor" format="color" />
  <attr name="titleRightText" format="string" />
  <attr name="titleRightBackground" format="color|reference" />
  <attr name="titleRightTextColor" format="color" />
 </declare-styleable>

private void initAttrs(AttributeSet attrs) {
  TypedArray ta = this.getContext().obtainStyledAttributes(attrs,
    R.styleable.titleBar);
  if (ta != null) {
   title = ta.getString(R.styleable.titleBar_title);
   titleTextSize = ta.getDimension(R.styleable.titleBar_titleTextSize,
     16);
   titleTextColor = ta
     .getColor(R.styleable.titleBar_titleTextColor, 0);
   titleLeftText = ta.getString(R.styleable.titleBar_titleLeftText);
   titleLeftBackground = ta
     .getDrawable(R.styleable.titleBar_titleLeftBackground);
   titleLeftTextColor = ta.getColor(
     R.styleable.titleBar_titleLeftTextColor, 0);
   titleRightText = ta.getString(R.styleable.titleBar_titleRightText);
   titleRightBackground = ta
     .getDrawable(R.styleable.titleBar_titleRightBackground);
   titleRightTextColor = ta.getColor(
     R.styleable.titleBar_titleRightTextColor, 0);
   ta.recycle();
  }
 }

 private void initView() {
  leftButton = new Button(getContext());
  titleTextView = new TextView(getContext());
  rightButton = new Button(getContext());

  leftButton.setTextColor(titleLeftTextColor);
  leftButton.setBackgroundDrawable(titleLeftBackground);
  leftButton.setText(titleLeftText);

  rightButton.setTextColor(titleRightTextColor);
  rightButton.setBackgroundDrawable(titleRightBackground);
  rightButton.setText(titleRightText);

  titleTextView.setText(title);
  titleTextView.setTextSize(titleTextSize);
  titleTextView.setTextColor(titleTextColor);

  mLeftLayoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT,
    LayoutParams.MATCH_PARENT);
  mLeftLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
  addView(leftButton, mLeftLayoutParams);

  mCenterLayoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT,
    LayoutParams.MATCH_PARENT);
  mCenterLayoutParams.addRule(RelativeLayout.CENTER_IN_PARENT);
  addView(titleTextView, mCenterLayoutParams);

  mRightLayoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT,
    LayoutParams.MATCH_PARENT);
  mRightLayoutParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
  addView(rightButton, mRightLayoutParams);
 }

 public interface ClickListener {
  void Click(int tag);
 }

 private ClickListener listener;

private void setListener() {
  leftButton.setOnClickListener(this);
  rightButton.setOnClickListener(this);
 }

 @Override
 public void onClick(View v) {
  if (listener != null) {
   if (v == leftButton) {
    listener.Click(LEFT_BUTTON);
   } else if (v == rightButton) {
    listener.Click(RIGHT_BUTTON);
   }
  }

 }

titleBar.setListener(new ClickListener() {
   
   @Override
   public void Click(int tag) {
    switch (tag) {
   case TitleBar.LEFT_BUTTON:
    Toast.makeText(MainActivity.this, "左边按钮被点击了", 0).show();
    break;
   case TitleBar.RIGHT_BUTTON:
    Toast.makeText(MainActivity.this, "右边按钮被点击了", 0).show();
    break;
   default:
    break;
   } 
   }
  });

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:custom="http://schemas.android.com/apk/res/com.example.test"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:padding="5dp"
 tools:context=".MainActivity">

 <!-- <include layout="@layout/topbar" /> -->

 <com.example.test.TitleBar
  android:id="@+id/titleBar"
  android:layout_width="match_parent"
  android:layout_height="40dp"
  custom:titleLeftBackground="@drawable/blue_button"
  custom:titleLeftText="Back"
  custom:titleLeftTextColor="#FFFFFF"
  custom:titleRightBackground="@drawable/blue_button"
  custom:titleRightText="More"
  custom:titleRightTextColor="#FFFFFF"
  custom:title="自定义标题"
  custom:titleTextColor="#123412"
  custom:titleTextSize="10sp"/>

</RelativeLayout>