1、查看是否有存储卡插入
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String status=Environment.getExternalStorageState();
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if ( status.equals ( Enviroment.MEDIA_MOUNTED ) )
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{
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说明有SD卡插入
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}
2、让某个Activity透明
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OnCreate中不设Layout
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this.setTheme(R.style.Theme_Transparent);
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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.
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TextView msgTextView = (TextView)findViewById(R.id.msg);
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msgTextView.setText(R.string.push_me);
4、发送短信
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String body=”this is mms demo”;
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Intent mmsintent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(”smsto”, number, null));
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mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_BODY, body);
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mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE, true);
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mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT, true);
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startActivity(mmsintent);
5、发送彩信
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StringBuilder sb = new StringBuilder();
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sb.append(”file://”);
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sb.append(fd.getAbsoluteFile());
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Intent intent = new Intent(Intent.ACTION_SENDTO, Uri.fromParts(”mmsto”, number, null));
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// Below extra datas are all optional.
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intent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_SUBJECT, subject);
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intent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_BODY, body);
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intent.putExtra(Messaging.KEY_ACTION_SENDTO_CONTENT_URI, sb.toString());
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intent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE, composeMode);
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intent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT, exitOnSent);
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startActivity(intent);
6、显示toast
Toast.makeText(this._getApplicationContext(), R.string._item, Toast.LENGTH_SHORT).show();
7、发送Mail
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mime = “img/jpg”;
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shareIntent.setDataAndType(Uri.fromFile(fd), mime);
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shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(fd));
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shareIntent.putExtra(Intent.EXTRA_SUBJECT, subject);
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shareIntent.putExtra(Intent.EXTRA_TEXT, body);
8、注册一个BroadcastReceiver
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registerReceiver(mMasterResetReciever, new IntentFilter(”OMS.action.MASTERRESET”));
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private BroadcastReceiver mMasterResetReciever = new BroadcastReceiver()
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{
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public void onReceive(Context context, Intent intent)
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{
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String action = intent.getAction();
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if (”oms.action.MASTERRESET”.equals(action) )
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{
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RecoverDefaultConfig();
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}
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}
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};
9、定义ContentObserver，监听某个数据表
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private ContentObserver mDownloadsObserver = new DownloadsChangeObserver(Downloads.CONTENT_URI);
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private class DownloadsChangeObserver extends ContentObserver
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{
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public DownloadsChangeObserver(Uri uri)
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{
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super(new Handler());
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}
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@Override
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public void onChange(boolean selfChange) {}
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}
10、获得 手机UA
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public String getUserAgent()
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{
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String user_agent = ProductProperties.get(ProductProperties.USER_AGENT_KEY, null);
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return user_agent;
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}
11、清空手机上cookie
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CookieSyncManager.createInstance (getApplicationContext() );
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CookieManager.getInstance().removeAllCookie();
12、建立GPRS连接
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//Dial the GPRS link.
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private boolean openDataConnection()
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{
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// Set up data connection.
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DataConnection conn = DataConnection.getInstance();
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if ( connectMode == 0 )
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{
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ret = conn.openConnection ( mContext, “cmwap”, "cmwap”, "cmwap” );
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}
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else
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{
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ret = conn.openConnection(mContext, “cmnet”, "", "");
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}
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}
13、PreferenceActivity 用法
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public class Setting extends PreferenceActivity
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{
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public void onCreate ( Bundle savedInstanceState )
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{
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super.onCreate ( savedInstanceState );
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addPreferencesFromResource ( R.xml.settings );
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}
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}
Setting.xml:
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Android:key=”seting2″
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android:title=”@string/seting2″
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android:summary=”@string/seting2″/>
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android:key=”seting1″
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android:title=”@string/seting1″
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android:summaryOff=”@string/seting1summaryOff”
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android:summaryOn=”@stringseting1summaryOff”/>
14、通过HttpClient从指定server获取数据
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DefaultHttpClient httpClient = new DefaultHttpClient();
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HttpGet method = new HttpGet(“http://www.ligotop.com/index.html”);
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HttpResponse resp;
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Reader reader = null;
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try {
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// AllClientPNames.TIMEOUT
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HttpParams params = new BasicHttpParams();
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params.setIntParameter(AllClientPNames.CONNECTION_TIMEOUT, 10000);
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httpClient.setParams(params);
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resp = httpClient.execute(method);
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int status = resp.getStatusLine().getStatusCode();
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if (status != HttpStatus.SC_OK)
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{
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return false;
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}
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// HttpStatus.SC_OK;
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return true;
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}
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catch (ClientProtocolException e)
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{
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// TODO Auto-generated catch block
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e.printStackTrace();
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