系统拼音输入法的键盘绘制通过在XmlKeyboardLoader.java解析skb_template1.xml skb_xxx.xml等文件，获取键盘和各按键的属性，
softKeyboard.addSoftKey(softKey)；将按键包装在softkey类，并添加到键盘softkeyboard类中，在SoftKeyboardView.java中绘制键盘。
skb_template1.xml 设置了全局属性要读懂xml文件，需要配合解析方法一起看。
<skb_template
skb_bg="@drawable/skb_container_bg" // 键盘背景
key_xmargin="0%p" //按键间距
key_ymargin="0%p"
balloon_bg="@drawable/key_balloon_bg"
popup_bg="@drawable/miniskb_bg"
color="@color/label_color" //lable颜色
color_highlight="@color/label_color" //press lable颜色
color_balloon="@color/balloon_color"> //气泡颜色
<key_type //背景图
id="0"
bg="@drawable/normal_key_bg" //normal状态背景
hlbg="@drawable/normal_key_hl_bg" //press状态背景
color_highlight="@color/label_color_hl0"/> //press lable颜色
<!-- Default ic** for enter key --> //图标
<key_icon code="66" icon="@drawable/enter_icon"
icon_popup="@drawable/enter_popup_icon"/>
<!-- Default key definition --> //默认按键
<!-- Enter key for QWERTY-like keyboards.-->
<key id="1" start_pos_x="83.5%p" start_pos_y="80%p"
width="10%p" height="20%p" code="66" key_type="1">
<toggle_state state_id="@string/toggle_enter_go" label="去往" code="66"/>
<toggle_state state_id="@string/toggle_enter_search" code="66"
icon="@drawable/search_icon" icon_popup="@drawable/search_popup_icon"/>
<toggle_state state_id="@string/toggle_enter_send" label="发送" code="66"/>
<toggle_state state_id="@string/toggle_enter_next" label="下一个" code="66"/>
<toggle_state state_id="@string/toggle_enter_done" label="完成" code="66"/>
</key>
</skb_template>
XmlKeyboardLoader.java中
private int mSkbTemplateId;
private Drawable mSkbBg;
private Drawable mBalloonBg;
private Drawable mPopupBg;
private float mXMargin = 0;
private float mYMargin = 0; //分别保存全局的样式
private Vector<SoftKeyType> mKeyTypeList = new Vector<SoftKeyType>(); //背景图 通过key_type索引
private Vector<KeyIconRecord> mKeyIconRecords = new Vector<KeyIconRecord>(); //功能键图标 通过code索引
private Vector<KeyRecord> mKeyRecords = new Vector<KeyRecord>(); //功能键 通过id索引
分别保存了 key_type key_icon key 3中标签的数据
SoftKey.java中
softkey的属性
protected SoftKeyType mKeyType; //key_type
protected Drawable mKeyIcon; //key_icon
protected Drawable mKeyIconPopup; //气泡图
protected String mKeyLabel; //lable
protected int mKeyCode; //code
protected boolean mKeySelected;
public int mPopupSkbId;
public float mLeftF;
public float mRightF;
public float mTopF;
public float mBottomF; //相对尺寸
public int mLeft;
public int mRight;
public int mTop;
public int mBottom; //绝对尺寸
Environment.java
onConfigurationChanged 配置了键盘大小，lable字体大小，气泡大小 ，等。
private static final float NORMAL_KEY_TEXT_SIZE_RATIO = 0.075f;
private static final float FUNCTION_KEY_TEXT_SIZE_RATIO =0.055f;
两种大小由key_type
XmlKeyboeardLoarder
skb_template2
key属性
id ；默认值-1 ，用于中定义defaultkey defaultkey可以制定更多属性 而qwerty里面的key继承属性width height type repeat balloon
start_pos_x x位置
start_pos_y y位置
code
lable
with 宽
height 高
key_type type里面定义了背景
repeat
balloon
key_xmargin 这两个属性并不是按键之间的间距
key_ymargin
private void drawSoftKey(Canvas canvas, SoftKey softKey, int keyXMargin,
int keyYMargin) {
Drawable bg;
int textColor;
if (mKeyPressed && softKey == mSoftKeyDown) {
bg = softKey.getKeyHlBg();
textColor = Color.BLACK;
} else {
bg = softKey.getKeyBg();
bg = r.getDrawable(R.drawable.softkey_bg_unselect);
textColor = Color.BLACK;
}
if (null != bg) {
if (softKey.isKeySelected()) {
if (isSkbOnFocus) {
mActiveCellDrawable.setBounds(softKey.mLeft + keyXMargin+1, softKey.mTop + keyYMargin+1,
softKey.mRight - keyXMargin-1, softKey.mBottom - keyYMargin-1);
mActiveCellDrawable.draw(canvas);
} else {
mActiveCellNoFocusDrawable.setBounds(softKey.mLeft + keyXMargin+1, softKey.mTop + keyYMargin+1,
softKey.mRight - keyXMargin-1, softKey.mBottom - keyYMargin-1);
mActiveCellNoFocusDrawable.draw(canvas);
}
} else {
bg.setBounds(softKey.mLeft + keyXMargin+1, softKey.mTop + keyYMargin+1,
softKey.mRight - keyXMargin-1, softKey.mBottom - keyYMargin-1);
bg.draw(canvas);
}
}
String keyLabel = softKey.getKeyLabel();
Drawable keyIcon = softKey.getKeyIcon();
if (null != keyIcon) {
Drawable icon = keyIcon;
int marginLeft = (softKey.width() - icon.getIntrinsicWidth()) / 2;
int marginRight = softKey.width() - icon.getIntrinsicWidth()
- marginLeft;
int marginTop = (softKey.height() - icon.getIntrinsicHeight()) / 2;
int marginBottom = softKey.height() - icon.getIntrinsicHeight()
- marginTop;
icon.setBounds(softKey.mLeft + marginLeft,
softKey.mTop + marginTop, softKey.mRight - marginRight,
softKey.mBottom - marginBottom);
icon.draw(canvas);
} else if (null != keyLabel) {
mPaint.setColor(textColor);
float x = softKey.mLeft
+ (softKey.width() - mPaint.measureText(keyLabel)) / 2.0f;
int fontHeight = mFmi.bottom - mFmi.top;
float marginY = (softKey.height() - fontHeight) / 2.0f;
float y = softKey.mTop + marginY - mFmi.top + mFmi.bottom / 1.5f;
canvas.drawText(keyLabel, x, y + 1, mPaint);
}
}
XmlResourceParser xml资源文件解析demo
public SkbTemplate loadSkbTemplate(int resourceId) {
if (null == mContext || 0 == resourceId) {
return null;
}
Resources r = mResources;
XmlResourceParser xrp = r.getXml(resourceId);
KeyCommonAttributes attrDef = new KeyCommonAttributes(xrp);
KeyCommonAttributes attrKey = new KeyCommonAttributes(xrp);
mSkbTemplate = new SkbTemplate(resourceId);
int lastKeyTypeId = KEYTYPE_ID_LAST;
int globalColor = 0;
int globalColorHl = 0;
int globalColorBalloon = 0;
try {
mXmlEventType = xrp.next();
while (mXmlEventType != XmlResourceParser.END_DOCUMENT) {
mNextEventFetched = false;
if (mXmlEventType == XmlResourceParser.START_TAG) {
String attribute = xrp.getName();
if (XMLTAG_SKB_TEMPLATE.compareTo(attribute) == 0) {
Drawable skbBg = getDrawable(xrp, XMLATTR_SKB_BG, null);
Drawable balloonBg = getDrawable(xrp,
XMLATTR_BALLOON_BG, null);
Drawable popupBg = getDrawable(xrp, XMLATTR_POPUP_BG,
null);
if (null == skbBg || null == balloonBg
|| null == popupBg) {
return null;
}
mSkbTemplate.setBackgrounds(skbBg, balloonBg, popupBg);
float xMargin = getFloat(xrp, XMLATTR_KEY_XMARGIN, 0);
float yMargin = getFloat(xrp, XMLATTR_KEY_YMARGIN, 0);
mSkbTemplate.setMargins(xMargin, yMargin);
// Get default global colors.
globalColor = getColor(xrp, XMLATTR_COLOR, 0);
globalColorHl = getColor(xrp, XMLATTR_COLOR_HIGHLIGHT,
0xffffffff);
globalColorBalloon = getColor(xrp,
XMLATTR_COLOR_BALLOON, 0xffffffff);
} else if (XMLTAG_KEYTYPE.compareTo(attribute) == 0) {
int id = getInteger(xrp, XMLATTR_ID, KEYTYPE_ID_LAST);
Drawable bg = getDrawable(xrp, XMLATTR_KEYTYPE_BG, null);
Drawable hlBg = getDrawable(xrp, XMLATTR_KEYTYPE_HLBG,
null);
int color = getColor(xrp, XMLATTR_COLOR, globalColor);
int colorHl = getColor(xrp, XMLATTR_COLOR_HIGHLIGHT,
globalColorHl);
int colorBalloon = getColor(xrp, XMLATTR_COLOR_BALLOON,
globalColorBalloon);
if (id != lastKeyTypeId + 1) {
return null;
}
SoftKeyType keyType = mSkbTemplate.createKeyType(id,
bg, hlBg);
keyType.setColors(color, colorHl, colorBalloon);
if (!mSkbTemplate.addKeyType(keyType)) {
return null;
}
lastKeyTypeId = id;
} else if (XMLTAG_KEYICON.compareTo(attribute) == 0) {
int keyCode = getInteger(xrp, XMLATTR_KEY_CODE, 0);
Drawable icon = getDrawable(xrp, XMLATTR_KEY_ICON, null);
Drawable iconPopup = getDrawable(xrp,
XMLATTR_KEY_ICON_POPUP, null);
if (null != icon && null != iconPopup) {
mSkbTemplate.addDefaultKeyIc**(keyCode, icon,
iconPopup);
}
} else if (XMLTAG_KEY.compareTo(attribute) == 0) {
int keyId = this.getInteger(xrp, XMLATTR_ID, -1);
if (-1 == keyId) return null;
if (!attrKey.getAttributes(attrDef)) {
return null;
}
// Update the key position for the key.
mKeyXPos = getFloat(xrp, XMLATTR_START_POS_X, 0);
mKeyYPos = getFloat(xrp, XMLATTR_START_POS_Y, 0);
SoftKey softKey = getSoftKey(xrp, attrKey);
if (null == softKey) return null;
mSkbTemplate.addDefaultKey(keyId, softKey);
}
}
// Get the next tag.
if (!mNextEventFetched) mXmlEventType = xrp.next();
}
xrp.close();
return mSkbTemplate;
} catch (XmlPullParserException e) {
// Log.e(TAG, "Ill-formatted keyboard template resource file");
} catch (IOException e) {
// Log.e(TAG, "Unable to keyboard template resource file");
}
return null;
}
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