1.platform/packages/apps/Browser/src/com/android/browser/BrowserSettings.java
2.platform/packages/apps/Browser/res/values/strings.xml
在strings.xml中找到這壹段：
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<!-- Do not tranlsate. Development option -->
<string-array name="pref_development_ua_choices" translatable="false">
<item>Android</item>
<item>Desktop</item>
<item>iPhone</item>
</string-array>
<!-- Do not tranlsate. Development option -->
<string-array name="pref_development_ua_values" translatable="false">
<item>0</item>
<item>1</item>
<item>2</item>
</string-array>
這壹段中pref_development_ua_choices對應的是Browser的debug模式下選擇UserAgent時選項的名字，pref_development_ua_values對應的是不同的UserAgent，壹會我會講到這些數字分別對應的是什麽UserAgent。
在BrowserSettings.java中找到這兩段：
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private static final String DESKTOP_USERAGENT = "Mozilla/5.0 (Macintosh; " +
"U; Intel Mac OS X 10_5_7; en-us) AppleWebKit/530.17 (KHTML, " +
"like Gecko) Version/4.0 Safari/530.17";
private static final String IPHONE_USERAGENT = "Mozilla/5.0 (iPhone; U; " +
"CPU iPhone OS 3_0 like Mac OS X; en-us) AppleWebKit/528.18 " +
"(KHTML, like Gecko) Version/4.0 Mobile/7A341 Safari/528.16";
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public void update(Observable o, Object arg) {
BrowserSettings b = (BrowserSettings)o;
WebSettings s = mSettings;
s.setLayoutAlgorithm(b.layoutAlgorithm);
if (b.userAgent == 0) {
// use the default ua string
s.setUserAgentString(null);
} else if (b.userAgent == 1) {
s.setUserAgentString(DESKTOP_USERAGENT);
} else if (b.userAgent == 2) {
s.setUserAgentString(IPHONE_USERAGENT);
}
由此我們可以看出第壹段Java代碼是不同的UserAgent字符串，從第二段代碼中我們可以看出strings.xml中那個整數的數組和不同UserAgent的對應關系，0對應默認的UserAgent，即Android Chrome Lite自己的UserAgent，1對應的是Mac OS的UserAgent，2對應的是IPhone OS的UserAgent。
有了上述信息，添加壹個自己的UserAgent就不是什麽難事了，首先在strings.xml中添加壹個UserAgent選項的名字，然後添加壹個序號，然後在BrowserSettings.java中添加壹個自己的UserAgent字符串，然後在最後壹個if後面寫壹個
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else if (b.userAgent == 3) {
s.setUserAgentString(YOUR_OWN_USERAGENT);
}
然後就大功告成了！