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Android自定义控件之我的电话小键盘

 
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关于Android的自定义控件,之前也写了两个,一个是简单地继承View,另一个通过继承Layout实现一个省市联动控件。这篇,将通过继承ViewGroup来实现一个电话拨打小键盘。本人一贯风格,懒得罗里吧嗦讲一大堆,直接上图上代码,一切尽在注释中!



1、MyPhoneCard.java

/**
 * 
 * 自定义一个4*3的拨打电话的布局控件,
 *
 *
 */
public class MyPhoneCard extends ViewGroup{
	
	private static final int COLUMNS = 3;
	private static final int ROWS = 4;
	private static final int NUM_BUTTON = COLUMNS*ROWS;
	
	private View[] mButtons = new View[NUM_BUTTON];
	
	private int mButtonWidth;
	private int mButtonHeight;
	private int mPaddingLeft;
	private int mPaddingRight;
	private int mPaddingTop;
	private int mPaddingBottom;
	private int mWidthInc;
	private int mHeightInc;
	private int mWidth;
	private int mHeight;

	public MyPhoneCard(Context context) {
		super(context);
	}
	
	public MyPhoneCard(Context context, AttributeSet attrs){
		super(context,attrs);
	}
	
	public MyPhoneCard(Context context, AttributeSet attrs, int defStyle){
		super(context,attrs,defStyle);
	}
	
	/**
	 * 当从xml将所有的控件都调入内存后,触发的动作
	 * 在这里获取控件的大小,并计算整个ViewGroup需要的总的宽和高
	 */
	@Override
	protected void onFinishInflate(){
		super.onFinishInflate();
		final View[] btns = mButtons;
		
		for(int i=0; i<NUM_BUTTON; i++){
			btns[i] = this.getChildAt(i);
			btns[i].measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
		}
		
		//缓存大小
		final View child = btns[0];
		mButtonWidth = child.getMeasuredWidth();
		mButtonHeight = child.getMeasuredHeight();
		mPaddingLeft = this.getPaddingLeft();
		mPaddingRight = this.getPaddingRight();
		mPaddingTop = this.getPaddingTop();
		mPaddingBottom = this.getPaddingBottom();
		mWidthInc = mButtonWidth + mPaddingLeft + mPaddingRight;
		mHeightInc = mButtonHeight + mPaddingTop + mPaddingBottom;
		
		mWidth = mWidthInc*COLUMNS;
		mHeight = mHeightInc*ROWS;
		
		Log.v("Finish Inflate:", "btnWidth="+mButtonWidth+",btnHeight="+mButtonHeight+",padding:"+mPaddingLeft+","+mPaddingTop+","+mPaddingRight+","+mPaddingBottom);

		
		
	}
	
	/**
	 * 这个方法在onFinishInflate之后,onLayout之前调用。这个方面调用两次
	 */
	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){
		super.onMeasure(widthMeasureSpec, heightMeasureSpec);
		Log.v("ViewGroup SIZE:width=", mWidth+"");
		Log.v("ViewGroup SIZE: height=",mHeight+"");
		final int width = resolveSize(mWidth, widthMeasureSpec);//传入我们希望得到的宽度,得到测量后的宽度
		final int height = resolveSize(mHeight,heightMeasureSpec);//传入我们希望得到的高度,得到测量后的高度
		Log.v("ViewGroup Measured SIZE: width=", width+"");
		Log.v("ViewGroup Measured SIZE: height=", height+"");
		//重新计算后的结果,需要设置。下面这个方法必须调用
		setMeasuredDimension(width, height);
	}

	/**
	 * 这个方法在onMeasure之后执行,这个自定义控件中含有12个子控件(每个小键),所以,重写这个方法,
	 * 调用每个键的layout,将他们一个一个布局好
	 * 就是4*3的放置,很简单,一个嵌套循环搞定
	 */
	@Override
	protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
		final View[] buttons = mButtons;
		int i = 0;
		Log.v("BOTTOM:", bottom+"");
		Log.v("TOP", top+"");
		
		int y = (bottom - top) - mHeight + mPaddingTop;//这里其实bottom-top=mHeight,所以y=mPaddingTop
		Log.v("Y=", y+"");
		for(int row=0; row<ROWS; row++){
			int x = mPaddingLeft;
			for(int col = 0; col < COLUMNS; col++){
				buttons[i].layout(x, y, x+mButtonWidth, y+mButtonHeight);
				x = x + mWidthInc;
				i++;
			}
			y = y + mHeightInc;
		}
	}

}

2、布局文件:

<?xml version="1.0" encoding="utf-8"?>
<demo.phone.card.MyPhoneCard
  xmlns:android="http://schemas.android.com/apk/res/android" 
  android:id = "@+id/dialpad" 
  android:paddingLeft="7dp" 
  android:paddingRight="7dp" 
  android:paddingTop="6dp" 
  android:paddingBottom="6dp" 
  android:layout_gravity="center" 
  android:layout_width="wrap_content"
  android:layout_height="wrap_content" 
  android:layout_marginBottom="5dp">
  
  	<ImageButton android:id="@+id/one" 
  		android:src="@drawable/dial_num_1_no_vm" 
  		style="@style/dial_btn_style" 
  		/>
  		
  	<ImageButton android:id="@+id/two" 
  		android:src="@drawable/dial_num_2" 
  		style="@style/dial_btn_style"/>  
  		
  	<ImageButton android:id="@+id/three" 
  		android:src="@drawable/dial_num_3" 
  		style="@style/dial_btn_style"/>  
  		
  	<ImageButton android:id="@+id/four" 
  		android:src="@drawable/dial_num_4" 
  		style="@style/dial_btn_style"/>  
  		
  	<ImageButton android:id="@+id/five" 
  		android:src="@drawable/dial_num_5" 
  		style="@style/dial_btn_style"/>
  		
  	<ImageButton android:id="@+id/six" 
  		android:src="@drawable/dial_num_6" 
  		style="@style/dial_btn_style"/> 
  		
  	<ImageButton android:id="@+id/seven" 
  		android:src="@drawable/dial_num_7" 
  		style="@style/dial_btn_style"/>
  		
  	<ImageButton android:id="@+id/eight" 
  		android:src="@drawable/dial_num_8" 
  		style="@style/dial_btn_style"/>
  		
  	<ImageButton android:id="@+id/nine" 
  		android:src="@drawable/dial_num_9" 
  		style="@style/dial_btn_style"/>  
  		
  	<ImageButton android:id="@+id/star" 
  		android:src="@drawable/dial_num_star" 
  		style="@style/dial_btn_style"/>   
  		
  	<ImageButton android:id="@+id/zero" 
  		android:src="@drawable/dial_num_0" 
  		style="@style/dial_btn_style"/>   
  		
  	<ImageButton android:id="@+id/pound" 
  		android:src="@drawable/dial_num_pound" 
  		style="@style/dial_btn_style"/>     		  		  		   		     		     		    		   		 		  				
    
</demo.phone.card.MyPhoneCard>

这样,就实现了上图的小键盘。这个例子参考Android自带电话应用的实现。可见,在开发中,灵活运用自定义的控件,可以实现独特而富有魅力的效果!
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