Android自定义布局

<?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="leftText" format="string"/>
        <attr name="leftTextBackgroud"  format="reference|color" />
        <attr name="leftTextColor" format="color" />
        
         <attr name="rightText" format="string"/>
        <attr name="rightTextBackgroud"  format="reference|color" />
        <attr name="rightTextColor" format="color" />
    </declare-styleable>
</resources>

public class TopBar extends RelativeLayout {

	//自定义控件
	private Button leftButton ,rightButton;
	private TextView tvTitle;
	//自定义属性
	private int leftTextColor;
	private Drawable leftBackGround;
	private String leftText;
	
	private int rightTextColor;
	private Drawable rightBackGround;
	private String rightText;
	
	private String titleText;
	private float titleTextSize;
	private int titleTextColor;
	private topBarListener tListener;
	
	public void settListener(topBarListener tListener) {
		this.tListener = tListener;
	}
	public interface topBarListener{
		public void clickLeft();
		public void clickRight();
	}
	private LayoutParams leftParams,rightParams,titleParams;
	@SuppressLint("NewApi")
	public TopBar(Context context, AttributeSet attrs) {
		super(context, attrs);
		// TODO Auto-generated constructor stub
		//获取属性值
		TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.topbar);
		leftTextColor = ta.getColor(R.styleable.topbar_leftTextColor, 0);
		leftBackGround = ta.getDrawable(R.styleable.topbar_leftTextBackgroud);
		leftText = ta.getString(R.styleable.topbar_leftText);
		
		rightTextColor = ta.getColor(R.styleable.topbar_rightTextColor, 0);
		rightBackGround = ta.getDrawable(R.styleable.topbar_rightTextBackgroud);
		rightText = ta.getString(R.styleable.topbar_rightText);
		
		titleText = ta.getString(R.styleable.topbar_title);
		titleTextSize = ta.getDimension(R.styleable.topbar_titleTextSize, 0);
		titleTextColor = ta.getColor(R.styleable.topbar_titleTextColor, 0);
		
		ta.recycle();
		//初始化控件
		leftButton = new Button(context);
		rightButton = new Button(context);
		tvTitle = new TextView(context);
		
		leftButton.setText(leftText);
		leftButton.setBackground(leftBackGround);
		leftButton.setTextColor(leftTextColor);
		
		rightButton.setText(rightText);
		rightButton.setTextColor(rightTextColor);
		rightButton.setBackground(rightBackGround);
		
		tvTitle.setText(titleText);
		tvTitle.setTextSize(titleTextSize);
		tvTitle.setTextColor(titleTextColor);
		tvTitle.setGravity(Gravity.CENTER);
		
		setBackgroundColor(0xfff5346);
		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 View.OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				tListener.clickLeft();	
			}
		});
		
		rightButton.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				tListener.clickRight();	
			}
		});
	}

}

public class MainActivity extends Activity {

	TopBar top  ;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		top = (TopBar)findViewById(R.id.myTop);
		top.settListener(new topBarListener() {
			
			@Override
			public void clickRight() {
				// TODO Auto-generated method stub
				Toast.makeText(getApplicationContext(), "clicked the right Button!", 1000).show();
			}
			
			@Override
			public void clickLeft() {
				// TODO Auto-generated method stub
				Toast.makeText(getApplicationContext(), "clicked the left Button!", 1000).show();
			}
		});
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:custom="http://schemas.android.com/apk/res/com.example.topbardemo"
    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"
    >

    <com.example.topbardemo.TopBar 
        android:id="@+id/myTop"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    custom:leftText="left"
    custom:leftTextColor="#003300"
    custom:leftTextBackgroud="#00BFFF"
    custom:title="title"
    custom:titleTextColor="#000000"
    custom:titleTextSize="14sp"
    custom:rightText="right"
    custom:rightTextColor="#000000"
     custom:rightTextBackgroud="#00BFFF">
    </com.example.topbardemo.TopBar>
</RelativeLayout>