Android一些很有用的代码片段

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

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OnCreate中不设Layoutthis.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.

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TextView msgTextView = (TextView)findViewById(R.id.msg);   msgTextView.setText(R.string.push_me);

4:发送短信

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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

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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);

7：发送Mail

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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

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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

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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

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public String getUserAgent()    {           String user_agent = ProductProperties.get(ProductProperties.USER_AGENT_KEY, null);            return user_agent;    }

11：清空手机上Cookie

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CookieSyncManager.createInstance(getApplicationContext());        CookieManager.getInstance().removeAllCookie();

12：建立GPRS连接

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//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

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public class Setting extends PreferenceActivity ｛     public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        addPreferencesFromResource(R.xml.settings)；    } ｝

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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

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DefaultHttpClient httpClient = new DefaultHttpClient();            HttpGet method = new HttpGet(“http://www.baidu.com/1.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();                }            }

15:显示toast

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 Toast.makeText(this._getApplicationContext(), R.string._item, Toast.LENGTH_SHORT).show();

原文链接：http://jinguo.javaeye.com/blog/690825