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.
TextViewmsgTextView=(TextView)findViewById(R.id.msg);
msgTextView.setText(R.string.push_me);4:发送短信
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
StringBuilder sb = new StringBuilder();
sb.append(”file://”);
sb.append(fd.getAbsoluteFile());
Intent intent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(”mmsto”, number, null));
//Belowextradatasarealloptional.
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);
7：发送Mail
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);
8:注册一个BroadcastReceiver
registerReceiver(mMasterResetReciever, new IntentFilter(”OMS.action.MASTERRESET”));
private BroadcastReceiver mMasterResetReciever = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent){
Stringaction=intent.getAction();
if(”oms.action.MASTERRESET”.equals(action)){
RecoverDefaultConfig();
}
}};
9:定义ContentObserver，监听某个数据表
private ContentObserver mDownloadsObserver = new DownloadsChangeObserver(Downloads.CONTENT_URI);
private class DownloadsChangeObserver extends ContentObserver {
publicDownloadsChangeObserver(Uriuri){
super(new Handler());}
@Override
publicvoidonChange(booleanselfChange){｝
}10:获得 手机UA
public String getUserAgent()
{
Stringuser_agent=ProductProperties.get(ProductProperties.USER_AGENT_KEY,null);
returnuser_agent;
}11：清空手机上cookie
CookieSyncManager.createInstance(getApplicationContext());CookieManager.getInstance().removeAllCookie();
12：建立GPRS连接
//Dial the GPRS link.
privatebooleanopenDataConnection(){
//Setupdataconnection.
DataConnection conn = DataConnection.getInstance();if (connectMode == 0) {
ret=conn.openConnection(mContext,“cmwap”,“cmwap”,“cmwap”);
}else{
ret=conn.openConnection(mContext,“cmnet”,“”,“”);
}}
13：PreferenceActivity 用法
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”/>14:通过HttpClient从指定server获取数据
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGetmethod=newHttpGet(“http://www.baidu.com/1.html”);
HttpResponseresp;
Readerreader=null;
try{
//AllClientPNames.TIMEOUT
HttpParamsparams=newBasicHttpParams();
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;
returntrue;
}catch(ClientProtocolExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}finally{
if(reader!=null)try{
reader.close();
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
15:显示toastToast.makeText(this._getApplicationContext(), R.string._item, Toast.LENGTH_SHORT).show();