类似iPhone的分段控件SegmentBar（带有小图标）

michaelye1988

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博客分类：

自定义Widget

这个相对于之前封装的那个空间，在每个Item中多了一个小图标，用来指示当前被点击了。

下面是效果图：

相对于之前封装的SegmentBar，代码的改动比较少，主要是控制Button的一个方法setCompoundDrawablesWithIntrinsicBounds(context.getResources().getDrawable(R.drawable.icon_arraw_bottom), null, null, null);

这个方法对应到布局文件中就是android:drawableLeft=""这个属性。

如果4个参数都为null，就代表不要图标。

下面直接上代码：

SegmentBar.java

import android.content.Context;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;

import com.michael.widget.segmentbarwithicon.R;

/**
 * 带小图标的分段控件
 * 
 * @author MichaelYe
 * @since 2012-8-21
 * 
 * */
public class SegmentBar extends LinearLayout implements OnClickListener
{
	private String[] stringArray;
	private Context mContext;
	
	public SegmentBar(Context context, AttributeSet attrs)
	{
		super(context, attrs);
		mContext = context;
	}

	public SegmentBar(Context context) 
	{
		super(context);
		mContext = context;
	}
	
	/**
	 * determine the number of segment bar items by the string array.
	 * 
	 * 根据传递进来的数组，决定分段的数量
	 * 
	 * 
	 * */
	public void setValue(Context context, String[] stringArray)
	{
		this.stringArray = stringArray;
		if(stringArray.length <= 1)
		{
			throw new RuntimeException("the length of String array must bigger than 1");
		}
		this.stringArray = stringArray;
		resolveStringArray(context);
	}
	
	/**
	 * resolve the array and generate the items.
	 * 
	 * 对数组进行解析，生成具体的每个分段
	 * 
	 * */
	private void resolveStringArray(Context context)
	{
		int length = this.stringArray.length;
		for(int i = 0; i < length; i++)
		{
			Button button = new Button(context);
			button.setText(stringArray[i]);
			button.setGravity(Gravity.CENTER);
//			button.setCompoundDrawablesWithIntrinsicBounds(context.getResources().getDrawable(R.drawable.icon_arraw_bottom), null, null, null);
			button.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, 1));
			button.setTag(i);
			button.setOnClickListener(this);
			
			if(i == 0)//左边的按钮
			{
				button.setBackgroundDrawable(context.getResources().getDrawable(R.drawable.tab_bar_selector));
				//button.setBackgroundResource(R.drawable.left_button_bg_selector);
			}
			else if(i != 0 && i < (length-1))//右边的按钮
			{
				button.setBackgroundResource(R.drawable.tab_bar_selector);
			}
			else//中间的按钮
			{
				button.setBackgroundResource(R.drawable.tab_bar_selector);
			}
			
			this.addView(button);
		}
	}

	private int lastIndex = 0;//记录上一次点击的索引
	public void onClick(View v)
	{
		int index = (Integer)v.getTag();
		onSegmentBarChangedListener.onBarItemChanged(index);
		
		Button lastButton = (Button)this.getChildAt(lastIndex);
		lastButton.setSelected(false);
		lastButton.setCompoundDrawablesWithIntrinsicBounds(null, null, null, null);//android:drawableTop
		
		Button currButton = (Button)this.getChildAt(index);
		currButton.setSelected(true);
		currButton.setCompoundDrawablesWithIntrinsicBounds(mContext.getResources().getDrawable(R.drawable.icon_arraw_bottom), null, null, null);
		
		lastIndex = index;
	}
	
	/**
	 * set the default bar item of selected
	 * 
	 * 设置默认选中的SegmentBar
	 * 
	 * */
	public void setDefaultBarItem(int index)
	{
		if(index > stringArray.length)
		{
			throw new RuntimeException("the value of default bar item can not bigger than string array's length");
		}
		lastIndex = index;
		Button btn = (Button)this.getChildAt(index);
		btn.setSelected(true);
		btn.setCompoundDrawablesWithIntrinsicBounds(mContext.getResources().getDrawable(R.drawable.icon_arraw_bottom), null, null, null);
		if(onSegmentBarChangedListener != null)
		{
			onSegmentBarChangedListener.onBarItemChanged(index);
		}
	}
	
	/**
	 * set the text size of every item
	 * 
	 * 设置文字的大小
	 * 
	 * */
	public void setTextSize(float sizeValue)
	{
		int index = this.getChildCount();
		for(int i = 0; i < index; i++)
		{
			((Button)this.getChildAt(i)).setTextSize(sizeValue);
		}
	}
	
	/**
	 * set the text color of every item
	 * 
	 * 设置文字的颜色
	 * 
	 * */
	public void setTextColor(int color)
	{
		int index = this.getChildCount();
		for(int i = 0; i < index; i++)
		{
			((Button)this.getChildAt(i)).setTextColor(color);
		}
	}
	
	private OnSegmentBarChangedListener onSegmentBarChangedListener;
	
	/**
	 * define a interface used for listen the change event of Segment bar
	 * 
	 * 定义一个接口，用来实现分段控件Item的监听
	 * 
	 * */
	public interface OnSegmentBarChangedListener
	{
		public void onBarItemChanged(int segmentItemIndex);
	}
	
	/**
	 * set the segment bar item changed listener,if the bar item changed, 
	 * the method onBarItemChanged()will be called.
	 * 
	 * 设置分段控件的监听器，当分段改变的时候，onBarItemChanged()会被调用
	 * 
	 * */
	public void setOnSegmentBarChangedListener(OnSegmentBarChangedListener onSegmentBarChangedListener)
	{
		this.onSegmentBarChangedListener = onSegmentBarChangedListener;
	}
}

MainActivity.java

/**
 * This class shows how to use the custom widget some like the widget of SegmentBar with Icon.
 * 
 * 这个类展示的是如何使用制作类似iPhone的并且带有图标的SegmentBar控件
 * 
 * @author MichaelYe
 * @since 2012-9-5
 * */
public class MainActivity extends Activity
{

    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        final TextView textView = (TextView)findViewById(R.id.tv_show);
        SegmentBar segmentBar = (SegmentBar)findViewById(R.id.ll_segment_bar);  
        segmentBar.setValue(MainActivity.this, new String[]{"Item0", "Item1", "Item2", "Item3"});  
        segmentBar.setTextSize(13);  
        segmentBar.setTextColor(this.getResources().getColor(R.color.title_color_white));  
        segmentBar.setOnSegmentBarChangedListener(new OnSegmentBarChangedListener()  
        {  
            public void onBarItemChanged(int segmentItemIndex)   
            {  
                textView.setText(segmentItemIndex+"");  
            }  
        });  
        segmentBar.setDefaultBarItem(0);  
    }

}

布局文件：

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/bg_login" >

    <RelativeLayout
        android:id="@+id/rl_title"
        android:layout_width="fill_parent"
        android:layout_height="45dip"
        android:layout_alignParentTop="true"
        android:background="@drawable/bg_title_bar"
        android:gravity="center_vertical" >

        <Button
            android:id="@+id/btn_back"
            android:layout_width="70dip"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_marginLeft="8dip"
            android:background="@drawable/title_btn_back_selector"
            android:text="@string/workbench_home_page"
            android:textColor="@color/title_button_color_gray" />

        <Button
            android:id="@+id/btn_add"
            android:layout_width="70dip"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_marginRight="8dip"
            android:background="@drawable/title_btn_rect_selector"
            android:text="@string/workbench_add_task"
            android:textColor="@color/title_button_color_gray" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:gravity="center"
            android:text="@string/workbench_title"
            android:textColor="@color/title_color_white"
            android:textSize="22sp" />
    </RelativeLayout>

    <com.michael.widget.SegmentBar
        android:id="@+id/ll_segment_bar"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/rl_title" />

    <TextView
        android:id="@+id/tv_show"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:textColor="@color/title_color_white"
        android:textSize="30sp" />

</RelativeLayout>

项目下载地址：

https://github.com/michaelye/DemoSegmentBarWithIcon