自定义控件属性

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name ="Topbar">
        <attr name = "title" format="string"/>
        <attr name = "titleSize" 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"/>
        <attr name = "rightBackground" format = "reference|color"/>
        <attr name = "rightText" format = "string"/>       
    </declare-styleable>
</resources>

public class Topbar extends RelativeLayout {
	private Button leftButton,rightButton;
	private TextView tvText;
	
	/**
	 * 左边字体的颜色
	 */
	private int leftTextColor;
	/**
	 * 左边背景的颜色
	 */
	private Drawable leftBackground;
	/**
	 * 左边butto文字
	 */
	private String leftText;
	/**
	 * 右边字体的颜色
	 */
	private int rightTextColor;
	/**
	 * 右边背景的颜色
	 */
	private Drawable rightBackground;
	/**
	 * 右边butto文字
	 */
	private String rightText;
	
	/**
	 * title要显示文字的大小
	 */
	private float titleTextSize;
	/**
	 * title字体的颜色
	 */
	private int titleTextColor;
	/**
	 * title的文字
	 */
	private String title;
	
	private LayoutParams leftParams,rightParams,titleParams;
	
	private topbarClickListener listener;
	/**
	 * 实现自己的接口
	 * @author Kevin
	 *
	 */
	public interface topbarClickListener{
		public void leftClick();
		public void rightClick();
	}
	/**
	 * 将传进来的映射
	 * @param listener
	 */
	public void setOnTopClickListener(topbarClickListener listener){
		this.listener = listener;
	}
	
    //需要自定义属性，所以需要attrs参数
	public Topbar(Context context, AttributeSet attrs) {
		super(context, attrs);
		//存取自定义属性中的值返回到TypedArray
		TypedArray ta = context.obtainStyledAttributes(attrs,R.styleable.Topbar);
		//完成属性赋值
		leftTextColor = ta.getColor(R.styleable.Topbar_leftTextColor, 0);
		leftBackground = ta.getDrawable(R.styleable.Topbar_leftBackground);
		rightText = ta.getString(R.styleable.Topbar_rightText);
		
		rightTextColor = ta.getColor(R.styleable.Topbar_rightTextColor, 0);
		rightBackground = ta.getDrawable(R.styleable.Topbar_rightBackground);
		leftText = ta.getString(R.styleable.Topbar_leftText);
		
		titleTextSize = ta.getDimension(R.styleable.Topbar_titleSize,0);
		titleTextColor = ta.getColor(R.styleable.Topbar_titleTextColor,0);
		title = ta.getString(R.styleable.Topbar_title);
		
		//TypedArray一定要回收，避免浪费资源和由于缓存造成的错误
		ta.recycle();
		
		leftButton = new Button(context);
		rightButton = new Button(context);
		tvText = new TextView(context);
		
		//自定义属性赋值给自定义的控件
		leftButton.setTextColor(leftTextColor);
		leftButton.setBackgroundDrawable(leftBackground);
		leftButton.setText(leftText);
		
		rightButton.setTextColor(rightTextColor);
		rightButton.setBackgroundDrawable(rightBackground);
		rightButton.setText(rightText);
		
		tvText.setTextColor(titleTextColor);
		tvText.setTextSize(titleTextSize);
		tvText.setText(title);
		tvText.setGravity(Gravity.CENTER);
		
		setBackgroundColor(0xFFF59563);
		//设置布局参数
		leftParams = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
		//居左对齐
		leftParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT,TRUE);
		
		//以leftParams的方式添加进去
		addView(leftButton,leftParams);
		
		//设置布局参数
		rightParams = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);
		//居右对齐
		rightParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT,TRUE);		
		addView(rightButton,rightParams);
		
		titleParams = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.MATCH_PARENT);
		titleParams.addRule(RelativeLayout.CENTER_IN_PARENT,TRUE);		
		addView(tvText,titleParams);		
		
		
		leftButton.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				listener.leftClick();
			}
		});
		
		rightButton.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				listener.rightClick();
			}
		});
		
	}
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:custom="http://schemas.android.com/apk/res/com.llc.defineview"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.llc.defineview.MainActivity" >
    <com.llc.defineview.Topbar 
        android:id="@+id/topbar"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        custom:leftBackground="@drawable/back_bg"
        custom:leftText="back"
        custom:leftTextColor="#ffffff"
        custom:rightBackground="@drawable/edit_bg"
        custom:rightText="more"
        custom:rightTextColor="#ffffff"
        custom:title="自定义标题"
        custom:titleTextColor="#123421"
        custom:titleSize="10sp">      
    </com.llc.defineview.Topbar>
</RelativeLayout>

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Topbar topbar = (Topbar) findViewById(R.id.topbar);
        topbar.setOnTopClickListener(new Topbar.topbarClickListener() {
			
			@Override
			public void rightClick() {
				Toast.makeText(MainActivity.this, "left", Toast.LENGTH_LONG).show();
			}
			
			@Override
			public void leftClick() {
				Toast.makeText(MainActivity.this, "right", Toast.LENGTH_LONG).show();
			}
		});
    }
}