Android实用的代码片段 常用代码总结
1:查看是否有存储卡插入
Stringstatus=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.
TextViewmsgTextView=(TextView)findViewById(R.id.msg); msgTextView.setText(R.string.push_me);
4:发送短信
Stringbody="thisismmsdemo"; Intentmmsintent=newIntent(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
StringBuildersb=newStringBuilder(); sb.append("file://"); sb.append(fd.getAbsoluteFile()); Intentintent=newIntent(Intent.ACTION_SENDTO,Uri.fromParts("mmsto",number,null)); //Belowextradatasarealloptional. 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,newIntentFilter("oms.action.MASTERRESET")); privateBroadcastReceivermMasterResetReciever=newBroadcastReceiver(){ publicvoidonReceive(Contextcontext,Intentintent){ Stringaction=intent.getAction(); if("oms.action.MASTERRESET".equals(action)){ RecoverDefaultConfig(); } } }
8:定义ContentObserver,监听某个数据表
privateContentObservermDownloadsObserver=newDownloadsChangeObserver(Downloads.CONTENT_URI); privateclassDownloadsChangeObserverextendsContentObserver{ publicDownloadsChangeObserver(Uriuri){ super(newHandler()); } @Override publicvoidonChange(booleanselfChange){} }
9:获得手机UA
publicStringgetUserAgent() { Stringuser_agent=ProductProperties.get(ProductProperties.USER_AGENT_KEY,null); returnuser_agent; }
10:清空手机上Cookie
CookieSyncManager.createInstance(getApplicationContext()); CookieManager.getInstance().removeAllCookie();11:建立GPRS连接
//DialtheGPRSlink. privatebooleanopenDataConnection(){ //Setupdataconnection. DataConnectionconn=DataConnection.getInstance(); if(connectMode==0){ ret=conn.openConnection(mContext,"cmwap","cmwap","cmwap"); }else{ ret=conn.openConnection(mContext,"cmnet","",""); } }