Android实用的代码片段 常用代码总结
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2022-08-17 19:47:09
1：查看是否有存储卡插入
复制代码 代码如下:
string status=environment.getexternalstoragestate();
if(sta...
1：查看是否有存储卡插入
复制代码 代码如下:
string status=environment.getexternalstoragestate();
if(status.equals(enviroment.media_mounted))
{
说明有sd卡插入
}
2：让某个activity透明
oncreate中不设layout this.settheme(r.style.theme_transparent);
以下是theme_transparent的定义（注意transparent_bg是一副透明的图片）
3：在屏幕元素中设置句柄
使用activity.findviewbyid来取得屏幕上的元素的句柄. 使用该句柄您可以设置或获取任何该对象外露的值.
复制代码 代码如下:
textview msgtextview = (textview)findviewbyid(r.id.msg);
msgtextview.settext(r.string.push_me);
4：发送短信
复制代码 代码如下:
string body="this is mms demo";
intent mmsintent = new intent(intent.action_sendto, uri.fromparts("smsto", number, null));
mmsintent.putextra(messaging.key_action_sendto_message_body, body);
mmsintent.putextra(messaging.key_action_sendto_compose_mode, true);
mmsintent.putextra(messaging.key_action_sendto_exit_on_sent, true);
startactivity(mmsintent);
5：发送彩信
复制代码 代码如下:
stringbuilder sb = new stringbuilder();
sb.append("file://");
sb.append(fd.getabsolutefile());
intent intent = new intent(intent.action_sendto, uri.fromparts("mmsto", number, null));
// below extra datas are all optional.
intent.putextra(messaging.key_action_sendto_message_subject, subject);
intent.putextra(messaging.key_action_sendto_message_body, body);
intent.putextra(messaging.key_action_sendto_content_uri, sb.tostring());
intent.putextra(messaging.key_action_sendto_compose_mode, composemode);
intent.putextra(messaging.key_action_sendto_exit_on_sent, exitonsent);
startactivity(intent)
6：发送mail
复制代码 代码如下:
mime = "img/jpg";
shareintent.setdataandtype(uri.fromfile(fd), mime);
shareintent.putextra(intent.extra_stream, uri.fromfile(fd));
shareintent.putextra(intent.extra_subject, subject);
shareintent.putextra(intent.extra_text, body);
7：注册一个broadcastreceiver
复制代码 代码如下:
registerreceiver(mmasterresetreciever, new intentfilter("oms.action.masterreset"));
private broadcastreceiver mmasterresetreciever = new broadcastreceiver() {
public void onreceive(context context, intent intent){
string action = intent.getaction();
if("oms.action.masterreset".equals(action)){
recoverdefaultconfig();
}
}
}
8：定义contentobserver，监听某个数据表
复制代码 代码如下:
private contentobserver mdownloadsobserver = new downloadschangeobserver(downloads.content_uri);
private class downloadschangeobserver extends contentobserver {
public downloadschangeobserver(uri uri) {
super(new handler());
}
@override
public void onchange(boolean selfchange) {｝
}
9：获得 手机ua
复制代码 代码如下:
public string getuseragent()
{
string user_agent = productproperties.get(productproperties.user_agent_key, null);
return user_agent;
}
10：清空手机上cookie
复制代码 代码如下:
cookiesyncmanager.createinstance(getapplicationcontext());
cookiemanager.getinstance().removeallcookie();11：建立gprs连接
//dial the gprs link.
private boolean opendataconnection() {
// set up data connection.
dataconnection conn = dataconnection.getinstance();
if (connectmode == 0) {
ret = conn.openconnection(mcontext, "cmwap", "cmwap", "cmwap");
} else {
ret = conn.openconnection(mcontext, "cmnet", "", "");
}
}
12：preferenceactivity 用法
复制代码 代码如下:
public class setting extends preferenceactivity
｛
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
addpreferencesfromresource(r.xml.settings)；
}
｝
setting.xml:
android:key="seting2″
android:title="@string/seting2″
android:summary="@string/seting2″/>
android:key="seting1″
android:title="@string/seting1″
android:summaryoff="@string/seting1summaryoff"
android:summaryon="@stringseting1summaryoff"/>
13：通过httpclient从指定server获取数据
复制代码 代码如下:
defaulthttpclient httpclient = new defaulthttpclient();
httpget method = new httpget("");
httpresponse resp;
reader reader = null;
try {
// allclientpnames.timeout
httpparams params = new basichttpparams();
params.setintparameter(allclientpnames.connection_timeout, 10000);
httpclient.setparams(params);
resp = httpclient.execute(method);
int status = resp.getstatusline().getstatuscode();
if (status != httpstatus.sc_ok) return false;
// httpstatus.sc_ok;
return true;
} catch (clientprotocolexception e) {
// todo auto-generated catch block
e.printstacktrace();
} catch (ioexception e) {
// todo auto-generated catch block
e.printstacktrace();
} finally {
if (reader != null) try {
reader.close();
} catch (ioexception e) {
// todo auto-generated catch block
e.printstacktrace();
}
}
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