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);
  }
}