1、查看是否有存储卡插入  

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- 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。
- TextView msgTextView = (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));
 - // 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、显示toast
- view plaincopy
 - Toast.makeText(this._getApplicationContext(), R.string._item, Toast.LENGTH_SHORT).show();
 
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)
 - {
 - String action = 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
 - {
 - public DownloadsChangeObserver(Uri uri)
 - {
 - super(new Handler());
 - }
 - @Override
 - public void onChange(boolean selfChange) {}
 - }
 
10、获得手机UA
- public String getUserAgent()
 - {
 - String user_agent = ProductProperties.get(ProductProperties.USER_AGENT_KEY, null);
 - return user_agent;
 - }
 
11、清空手机上cookie
- CookieSyncManager.createInstance (getApplicationContext() );
 - CookieManager.getInstance().removeAllCookie();
 
12、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”, "", "");
 - }
 - }
 
13、PreferenceActivity 用法
- public class Setting extends PreferenceActivity
 - {
 - public void onCreate ( Bundle savedInstanceState )
 - {
 - super.onCreate ( savedInstanceState );
 - addPreferencesFromResource ( R.xml.settings );
 - }
 - }
 - Setting.xml:
 - [java]
 - 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();- HttpGet method = new HttpGet(“/templets/default/index.html”);
 - 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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本文标题:Android编程中14个解决实际问题的代码片段
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