定义组合控件的基本思路

1. 布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@android:color/holo_green_light"
    android:orientation="horizontal" >
    <ImageButton 
        android:id="@+id/ibtn_back"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:background="@drawable/selector_back_btn"
        />
    <TextView 
        android:id="@+id/tv_title"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:textSize="25sp"
        android:layout_marginLeft="20dp"
        android:layout_gravity="center"
        android:gravity="center_vertical"
        android:textColor="@android:color/background_dark"
        android:text="Test"
        />

</LinearLayout>

2.

package com.bwf.view_06;

import android.app.Activity;
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.TextView;

/**
 * 定义组合控件的基本思路
 *         1. 创建一个布局文件用于展示组合控件的视图
 *         2. 把需要的控件定义在该文件中
 *         3. 将布局文件加载到我们定义的某一个容器ViewGroup
 *         4. 在该容器中实现相关功能，并且将一些公共的操作方法提供出去
 *         5. 在布局文件、或者java代码中去使用组合控件
 * 
 * */
public class View_Title extends LinearLayout{
    View view;
    ImageButton ibtn;
    TextView tv;
    Context context;
    
    public View_Title(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        // TODO Auto-generated constructor stub
        init(context);
    }

    public View_Title(Context context, AttributeSet attrs) {
        super(context, attrs);
        // TODO Auto-generated constructor stub
        init(context);
    }

    public View_Title(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
        init(context);
    }

    private void init(final Context context) {
        view = LayoutInflater.from(context).inflate(R.layout.view_title, null);
        
        ibtn = (ImageButton) view.findViewById(R.id.ibtn_back);
        tv = (TextView) view.findViewById(R.id.tv_title);
        
        // 将view添加到当前LinearLayout上
        addView(view, LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        
        this.context = context;
    }
    
    /**
     * 设置标题
     * */
    public void setTitleText(String s){
        tv.setText(s);
    }
    
    /**
     * 获取标题内容
     * */
    public String getTitleText(){
        return tv.getText()+"";
    }
    
    /**
     * 启用结束按钮
     * */
    public void setEnableFinishClick(){
        ibtn.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                ((Activity)context).finish();
            }
        });
    }
    
}

3.

package com.bwf.view_06;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class MainActivity extends Activity {
    View_Title vt;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        vt = (View_Title) findViewById(R.id.vt);
        
        // 设置组合View标题
        vt.setTitleText("组合View展示");
        // 启用结束activity的按钮
        vt.setEnableFinishClick();
    }

    @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:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/black" >

    <com.bwf.view_06.View_Title
        android:id="@+id/vt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        />

</RelativeLayout>