Android常用到的一些事件

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: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(); 



}; 

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: 

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”/> 

13:通过HttpClient从指定server获取数据 

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(); 



14:显示toast 

Toast.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 
public static class AlarmReceiver extends BroadcastReceiver { 
@Override 
public void onReceive(Context context, Intent intent) { 
Toast.makeText(context, “闹钟提示:时间到!”, Toast.LENGTH_LONG).show(); 



2)、建立Intent和PendingIntent,来调用目标组件。 
Intent intent = new Intent(this, AlarmReceiver.class); 
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0); 

3)、设置闹钟 
获取闹钟管理的实例: 
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE); 
设置单次闹钟: 
alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (5*1000), pendingIntent); 
设置周期闹钟: 
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + (10*1000), (24*60*60*1000), pendingIntent); 

20:开机自启动 

1).定义一个BroadcastReceiver 

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); 



2).配置Receiver的许可,允许接收系统启动消息,在AndroidManifest.xml中: 


3).配置Receiver,可以接收系统启动消息,在AndroidManifest.xml中 


4).启动模拟器,可以看到系统启动后,弹出一个对话框。 

本文来自CSDN博客,转载请标明出处:http://blog.csdn.net/lxh2808/archive/2010/10/30/5976351.aspx 

posted @ 2013-08-26 15:29  wanghongwin  阅读(387)  评论(0编辑  收藏  举报