Android自定义控件之我的电话小键盘
Android自定义控件之我的电话小键盘
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;
- }
- }
- }
- <?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>
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