rightParams.addRule(RelativeLayout.ALIGN_RIGHT,TRUE);这一局里面不能填ALIGN_RIGHT,要填ALIGN_END.不要问为什么,我也不知道.理论上面,后者是为了防止一些国家右边为先而设置的,但是前者的设置其实也行啊

TOPbar.java/代码

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);

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();

leftButton = new Button(context);

rightButton = new Button(context);

tvTitle = new TextView(context);

leftButton.setTextColor(leftTextColor);

leftButton.setBackground(leftBackground);

leftButton.setText(leftText);

rightButton.setTextColor(rightTextColor);

rightButton.setBackground(rightBackground);

rightButton.setText(rightText);

tvTitle.setTextColor(titleTextColor);

tvTitle.setTextSize(titleTextSize);

tvTitle.setText(title);

tvTitle.setGravity(Gravity.CENTER);

setBackgroundColor(0xFFF59563);

leftParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);

leftParams.addRule(RelativeLayout.ALIGN_LEFT,TRUE);

addView(leftButton,leftParams);

rightParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);

rightParams.addRule(RelativeLayout.ALIGN_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 arg0) {

// TODO Auto-generated method stub

listener.leftClick();

}

});

rightButton.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

listener.rightClick();

}

});

}

}

xml/代码

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

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

       xmlns:custom="http://schemas.android.com/apk/res/com.example.recipes">

<LinearLayout 

android:orientation="vertical" 

android:layout_width="fill_parent" 

android:layout_height="fill_parent">

<com.example.recipes.Topbar

   android:id="@+id/topbar"

   android:layout_width="match_parent" 

android:layout_height="45dp"

custom:leftBackground="@drawable/servise"

custom:leftTextColor="#FFFFFF"

custom:rightBackground="@drawable/saerch"

custom:rightTextColor="#FFFFFF"

        custom:title="分类"

        custom:titleTextColor="#123412"

        custom:titleTextSize="10sp">

</com.example.recipes.Topbar>

<LinearLayout 

android:orientation="vertical" 

android:layout_width="fill_parent" 

android:layout_height="0dp" 

android:layout_weight="1">

<ListView 

android:id="@+id/app_index_list_view" 

android:layout_width="fill_parent" 

android:layout_height="wrap_content" 

android:descendantFocusability="blocksDescendants"

android:fadingEdge="vertical" 

android:fadingEdgeLength="5dip" 

android:divider="@null"

android:cacheColorHint="#00000000" />

</LinearLayout>

<include layout="@layout/tab" />

</LinearLayout>

</merge>