Android编程14个实用的代码片段
jopen
12年前
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
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
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 ); } }
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(); } }