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.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: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);7:注册一个BroadcastReceiverregisterReceiver(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(); } } }; 8: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) {} }
9:获得 手机UA public String getUserAgent() { String user_agent = ProductProperties.get(ProductProperties.USER_AGENT_KEY, null); return user_agent; } 10:清空手机上Cookie CookieSyncManager.createInstance(getApplicationContext()); CookieManager.getInstance().removeAllCookie(); 11: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”, “”, “”); } } 12:PreferenceActivity 用法public class Setting extends PreferenceActivity{ public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); addPreferencesFromResource(R.xml.settings); }}Setting.xml: :key=”seting2″ :title=”@string/seting2″ android:summary=”@string/seting2″/> android:key=”seting1″ android:title=”@string/seting1″ android:summaryOff=”@string/seting1summaryOff” android:summaryOn=”@stringseting1summaryOff”/> 13:通过HttpClient从指定server获取数据 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, 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(); } } 14:显示toastToast.makeText(this._getApplicationContext(), R.string._item, Toast.LENGTH_SHORT).show();15:屏幕显示
程序中默的显示是带有标题栏和系统信息栏的,有的时候,这很影响程序界面的美观。手机默认的是竖屏,或与感应器状态相关,为了某种效果,我们的程序需要限制使用横屏或竖屏。以下的代码就解决了上述问题。//设置为无标题栏 requestWindowFeature(Window.FEATURE_NO_TITLE); //设置为全屏模式 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);//设置为横屏 setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 16:Intent传参 当Activity与Activity/Service(或其它情况)有时与要进行参数传递,最常用也是最简单的方式就是通过Intent来处理。 看如下代码: Intent intent = new Intent(...); Bundle bundle = new Bundle(); bundle.putString("NAME", "zixuan"); intent.putExtras(bundle); context.startActivity(intent); 或 context.startService(intent); 当然,有传送就有接收,接收也很简单,如: Bundle bunde = intent.getExtras(); String name = bunde.getInt("NAME");当然参数KEY要与传送时的参数一致。 17:获取手机号 在j2me中,根本没有办法获取用户的手机号码,就连获取手机串号(IMEI)都基本上无法实现,然后在android手机上一切都是如此的简单,看代码: TelephonyManager tm = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);String imei = tm.getDeviceId(); String tel = tm.getLine1Number();看来,android的确加速了j2me的消亡。 18:振动器 总感觉手机上的振动器没有多大用处(当然静音模式下的振铃很有用),但还是顺带着说一下吧,只有两行代码: 1、获取振动服务的实例 Vibrator vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE); 2、设置振动时长,单位当然也是ms vibrator.vibrate(1000); 如果你觉得这样过去单调的话,可以设个节奏: vibrator.vibrate(new long[]{10, 100, 20, 200}, -1); 两个参数,习惯告诉我第一个是节奏,第二个是重复次数,可事实并没有这么简单,我翻译不好,大家还是看原文吧: public void vibrate (long[] pattern, int repeat) pattern: an array of longs of times to turn the vibrator on or off. repeat: the index into pattern at which to repeat, or -1 if you don't want to repeat.google喜欢弄些技巧,我却觉得这里有点弄巧成拙了。 19:闹钟管理 最近看了一下Android的闹钟管理类(AlarmManager),真不错误,强大又简单,代码如下: 1、建立一个AlarmReceiver继承入BroadcastReceiver,并在AndroidManifest.xml声明
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- public class BootReceiver extends BroadcastReceiver {
- public void onReceive(Context ctx, Intent intent) {
- Log.d("BootReceiver", "system boot completed");
- //start activity
- String action="android.intent.action.MAIN";
- String category="android.intent.category.LAUNCHER";
- Intent myi=new Intent(ctx,CustomDialog.class);
- myi.setAction(action);
- myi.addCategory(category);
- myi.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
- ctx.startActivity(myi);
- //start service
- Intent s=new Intent(ctx,MyService.class);
- ctx.startService(s);
- }
- }
- <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
- <receiver android:name=".app.BootReceiver">
- <intent-filter>
- <action android:name="android.intent.action.BOOT_COMPLETED"/>
- <category android:name="android.intent.category.HOME" />
- </intent-filter>
- </receiver>