自定义控件（17）---布局方式组合系统控件，并封装自定义控件思想(自定义CheckBox)

先看主布局

activity_main.xml（就一个自定义控件）

<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"  
    tools:context="com.example.customerview.MainActivity" >  
  
    <com.example.customerview.CustomerView  
        android:layout_width="fill_parent"  
        android:layout_height="wrap_content" />  
  
</RelativeLayout>  

MainActivity（简单吧，就加载一个主布局文件）

package com.example.customerview;  
  
import android.app.Activity;  
import android.os.Bundle;  
import android.view.Menu;  
import android.view.MenuItem;  
  
public class MainActivity extends Activity {  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
    }  
  
} 

来看自定义控件

CustomerView

package com.example.customerview;  
  
import android.content.Context;  
import android.util.AttributeSet;  
import android.view.View;  
import android.widget.LinearLayout;  
import android.widget.Toast;  
  
public class CustomerView extends LinearLayout implements View.OnClickListener {  
    private Context context;  
  
    public CustomerView(Context context, AttributeSet attrs, int defStyleAttr) {  
        super(context, attrs, defStyleAttr);  
        init(context);  
    }  
  
    public CustomerView(Context context, AttributeSet attrs) {  
        super(context, attrs);  
        init(context);  
    }  
  
    public CustomerView(Context context) {  
        super(context);  
        init(context);  
    }  
  
    /** 
     * 初始化 
     */  
    private void init(Context context) {  
        this.context = context;  
        inflate(context, R.layout.childview, this);  
        View button1 = findViewById(R.id.button1);  
        View button2 = findViewById(R.id.button2);  
        button1.setOnClickListener(this);  
        button2.setOnClickListener(this);  
    }  
  
    @Override  
    public void onClick(View v) {  
        switch (v.getId()) {  
        case R.id.button1:  
            Toast.makeText(context, "button1", 0).show();  
            break;  
  
        case R.id.button2:  
            Toast.makeText(context, "button2", 0).show();  
            break;  
        default:  
            break;  
        }  
    }  
  
}  

inflate(context, R.layout.childview, this);这行代码加载的布局
childview.xml（简单把）

<?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="match_parent"  
    android:orientation="horizontal" >  
  
    <Button  
        android:id="@+id/button2"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:text="Button" />  
  
    <Button  
        android:id="@+id/button1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:text="Button" />  
  
</LinearLayout>  

接下来看一个自定义的CheckBox系统控件

+++++++++++++++++++++++++++++++++++++++++++开始+++++++++++++++++++++++++++++++++++++++++++

activity_main.xml

<?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="match_parent" >

    <com.aigestudio.customviewdemo.activities.CustomCheckBox
        android:id="@+id/main_ccb"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" >
    </com.aigestudio.customviewdemo.activities.CustomCheckBox>

</LinearLayout>

view_custom_check_box.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ImageView
        android:id="@+id/view_custom_check_box_on"
        android:layout_width="60dp"
        android:layout_gravity="center"
        android:scaleType="fitCenter"
        android:layout_height="60dp" />

    <ImageView
        android:id="@+id/view_custom_check_box_off"
        android:layout_gravity="center"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:scaleType="fitCenter" />

</FrameLayout>

MainActivity

package com.aigestudio.customviewdemo.activities;

import android.app.Activity;
import android.os.Bundle;
import android.widget.Toast;

import com.aigestudio.customviewdemo.R;
import com.aigestudio.customviewdemo.activities.CustomCheckBox.CustomCheckBoxChangeListener;

/**
 * 主界面
 */
public class MainActivity extends Activity {
	private CustomCheckBox ccbTest;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		ccbTest = (CustomCheckBox) findViewById(R.id.main_ccb);
		ccbTest.setCustomCheckBoxChangeListener(new CustomCheckBoxChangeListener() {
			@Override
			public void customCheckBoxOn() {
				Toast.makeText(MainActivity.this, "Check on", Toast.LENGTH_SHORT).show();
			}

			@Override
			public void customCheckBoxOff() {
				Toast.makeText(MainActivity.this, "Check off", Toast.LENGTH_SHORT).show();
			}
		});
	}
}

MeasureUtil

package com.aigestudio.customviewdemo.activities;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.util.DisplayMetrics;

/**
 * 测绘工具类
 */
public final class MeasureUtil {
	/**
	 * 获取屏幕尺寸
	 * 
	 * @param activity
	 *            Activity
	 * @return 屏幕尺寸像素值，下标为0的值为宽，下标为1的值为高
	 */
	public static int[] getScreenSize(Activity activity) {
		DisplayMetrics metrics = new DisplayMetrics();
		activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
		return new int[] { metrics.widthPixels, metrics.heightPixels };
	}

}

CustomCheckBox

package com.aigestudio.customviewdemo.activities;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageView;

import com.aigestudio.customviewdemo.R;

/**
 * 自定义CheckBox
 * 
 */
public class CustomCheckBox extends FrameLayout {
	private ImageView ivCheckOn, ivCheckOff;// 两种状态的ImageView

	private boolean isCheck;// 是否被选中的标志值

	public CustomCheckBox(Context context) {
		this(context, null);
	}

	public CustomCheckBox(Context context, AttributeSet attrs) {
		this(context, attrs, 0);
	}

	public CustomCheckBox(Context context, AttributeSet attrs, int defStyleAttr) {
		super(context, attrs, defStyleAttr);

		// 设置布局文件
		LayoutInflater.from(context).inflate(R.layout.view_custom_check_box, this);

		// 获取控件元素
		ivCheckOn = (ImageView) findViewById(R.id.view_custom_check_box_on);
		ivCheckOff = (ImageView) findViewById(R.id.view_custom_check_box_off);

		// 设置两个ImageView的点击事件
		ivCheckOn.setOnClickListener(new ClickListener());
		ivCheckOff.setOnClickListener(new ClickListener());


		int imageOnResId = getResources().getIdentifier("bluedot", "drawable" , context.getPackageName());  
		int imageOffResId = getResources().getIdentifier("reddot", "drawable" , context.getPackageName());  
		
		// 设置显示资源
		setOnImage(imageOnResId);
		setOffImage(imageOffResId);

		// 默认显示的是没被选中的状态
		setCheckOff();
	}
	/**
	 * 设置开启状态时CustomCheckBox的图片
	 */
	public void setOnImage(int resId) {
		ivCheckOn.setImageResource(resId);
	}

	/**
	 * 设置关闭状态时CustomCheckBox的图片
	 */
	public void setOffImage(int resId) {
		ivCheckOff.setImageResource(resId);
	}

	/**
	 * 设置CustomCheckBox为关闭状态
	 */
	public void setCheckOff() {
		isCheck = false;
		ivCheckOn.setVisibility(GONE);
		ivCheckOff.setVisibility(VISIBLE);
	}
	/**
	 * 设置CustomCheckBox为开启状态
	 */
	public void setCheckOn() {
		isCheck = true;
		ivCheckOn.setVisibility(VISIBLE);
		ivCheckOff.setVisibility(GONE);
	}

	/**
	 * 状态改变监听接口
	 */
	private CustomCheckBoxChangeListener customCheckBoxChangeListener;// 切换的监听器
	public interface CustomCheckBoxChangeListener {
		void customCheckBoxOn();
		void customCheckBoxOff();
	}
	public void setCustomCheckBoxChangeListener(
			CustomCheckBoxChangeListener customCheckBoxChangeListener) {
		this.customCheckBoxChangeListener = customCheckBoxChangeListener;
	}



	/**
	 * 自定义CustomCheckBox中控件的事件监听器
	 */
	private class ClickListener implements OnClickListener {

		@Override
		public void onClick(View v) {
			switch (v.getId()) {
			case R.id.view_custom_check_box_on:
				setCheckOff();
				customCheckBoxChangeListener.customCheckBoxOff();
				break;
			case R.id.view_custom_check_box_off:
				setCheckOn();
				customCheckBoxChangeListener.customCheckBoxOn();
				break;
			}
		}
	}
}