14个简单有用的android源码,适合初学者

1：查看是否有存储卡插入

String status=Environment.getExternalStorageState();  
if(status.equals(Enviroment.MEDIA_MOUNTED))  
{  
   ;//说明有SD卡插入  
} 

2：让某个Activity透明

在OnCreate 中不设Layout,然后this.setTheme(R.style.Theme_Transparent);

3：获取屏幕宽高

DisplayMetrics dm = new DisplayMetrics();    
//获取窗口属性  
getWindowManager().getDefaultDisplay().getMetrics(dm);      
int screenWidth = dm.widthPixels;    
int screenHeight = dm.heightPixels;  

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

[java] view plaincopyprint? 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

[java] view plaincopyprint? 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

[java] view plaincopyprint? 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

[java] view plaincopyprint? 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

[java] view plaincopyprint? public String getUserAgent() { String user_agent = ProductProperties.get(ProductProperties.USER_AGENT_KEY, null); return user_agent; }

11：清空手机上Cookie

[java] view plaincopyprint? CookieSyncManager.createInstance(getApplicationContext()); CookieManager.getInstance().removeAllCookie();

12：建立GPRS 连接

[java] view plaincopyprint? private boolean openDataConnection() { DataConnection conn = DataConnection.getInstance(); if (connectMode == 0) { ret = conn.openConnection(mContext, “cmwap”, “cmwap”, “cmwap”); } else { ret = conn.openConnection(mContext, “cmnet”, “”, “”); } }

13：PreferenceActivity 用法

[java] view plaincopyprint? public class Setting extends PreferenceActivity｛ public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.settings)； } ｝

Setting.xml:

[html] view plaincopyprint? 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

[java] view plaincopyprint? 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(); } }