14个简单有用的android源码,适合初学者(简单又实用的)

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1：查看是否有存储卡插入

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

4:发送短信

5:发送彩信

[java] view plaincopyprint?StringBuilder sb = new StringBuilder(); sb.append(” 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) {｝ }

:获得 手机UA

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

：清空手机上Cookie

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

：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”, “”, “”); } }

：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”/>

:通过 HttpClient从指定server获取数据

[java] view plaincopyprint? DefaultHttpClient httpClient = new DefaultHttpClient(); HttpGet method = new HttpGet(“ HttpResponse resp; Reader reader = null; try { // AllClientPNames.TIMEOUT HttpParams params = new BasicHttpParams(); params.setIntParameter(AllClientPNames.CONNECTION_TIMEOUT, ); 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(); } }

【mclin】手把手叫你在Eclipse里添加Android开发功能（附：完整离线版Android_SDK和Android_ADT下载） 还在使用旧版本的Android_SDK吗？那你就Out了。你还在为更新SDK得到网址被拒绝而烦恼吗？那么现在就是你幸福的时刻了，截止年5月日完整版SDK现在

Eclipse出现java heap space解决方法 javaheapspace解决方法在开发androidapplications时runapk时有时会出现弹出javaheapspace的提示，然后eclipse直接就挂了。在网上搜索了各种方法依然没有解决这个问

Android中与ViewRoot相关的一些概念 1、View和ViewRootViewRoot从名称上来理解乎是View树的根，这很容易让人产生误解。因为ViewRoot并不属于View树的一份子。从源码实现上来看，ViewRoot和View对象