android自定义组件实现方法

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <declare-styleable name="TopBar">
    <attr name="titleText" format="string"/>
    <attr name="titleTextSize" format="dimension"/>
    <attr name="titleTextColor" format="color"/>
    <attr name="leftText" format="string"/>
    <attr name="leftBackground" format="reference|color"/>
    <attr name="leftTextColor" format="color"/>
    <attr name="rightText" format="string"/>
    <attr name="rightBackground" format="reference|color"/>
    <attr name="rightTextColor" format="color"/>
  </declare-styleable>
</resources>

package com.cd.administrator.mytopbar;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.os.Build;
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;
import android.widget.Toast;
/**
 * Created by Administrator on 2015/1/8.
 */
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 int titleTextColor;
  private String titleText;
  private float titleTextSize;
  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;
  }
  @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
  public TopBar(final 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);
    titleTextColor = ta.getColor(R.styleable.TopBar_titleTextColor,0);
    titleTextSize = ta.getDimension(R.styleable.TopBar_titleTextSize,0);
    titleText = ta.getString(R.styleable.TopBar_titleText);
    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(titleText);
    tvTitle.setGravity(Gravity.CENTER);
    setBackgroundColor(0xf59563);
    leftParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
    leftParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT,TRUE);
    addView(leftButton,leftParams);
    rightParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
    rightParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT,TRUE);
    addView(rightButton,rightParams);
    titleParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.MATCH_PARENT);
    titleParams.addRule(RelativeLayout.CENTER_IN_PARENT,TRUE);
    addView(tvTitle,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-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:paddingLeft="@dimen/activity_horizontal_margin"
  android:paddingRight="@dimen/activity_horizontal_margin"
  android:paddingTop="@dimen/activity_vertical_margin"
  android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
  <com.cd.administrator.mytopbar.TopBar
    android:id="@+id/topBar"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    custom:leftBackground="@drawable/blue"
    custom:leftText="Back"
    custom:leftTextColor="#ffffff"
    custom:rightBackground="@drawable/blue"
    custom:rightText="More"
    custom:rightTextColor="#ffffff"
    custom:titleTextColor="#121212"
    custom:titleTextSize="15sp"
    custom:titleText="自定义标题">
  </com.cd.administrator.mytopbar.TopBar>
</RelativeLayout>

package com.cd.administrator.mytopbar;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity {
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    TopBar topBar = (TopBar) findViewById(R.id.topBar);
    topBar.setOnTopBarClickListener(new TopBar.topBarClickListener() {
      @Override
      public void leftClick() {
        Toast.makeText(MainActivity.this, "cd--left", Toast.LENGTH_SHORT).show();
      }
      @Override
      public void rightClick() {
        Toast.makeText(MainActivity.this,"cd--right",Toast.LENGTH_SHORT).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.menu_main, menu);
    return true;
  }
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
      return true;
    }
    return super.onOptionsItemSelected(item);
  }
}