本文实例总结了android开发常用经典代码段。分享给大家供大家参考，具体如下：
1、图片旋转
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bitmap bitmaporg = bitmapfactory.decoderesource(this.getcontext().getresources(), r.drawable.moon);matrix matrix = new matrix();matrix.postrotate(-90);//旋转的角度bitmap resizedbitmap = bitmap.createbitmap(bitmaporg, 0, 0, bitmaporg.getwidth(), bitmaporg.getheight(), matrix, true);bitmapdrawable bmd = new bitmapdrawable(resizedbitmap); |
2、获取手机号码
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//创建电话管理telephonymanager tm = (telephonymanager)//与手机建立连接activity.getsystemservice(context.telephony_service);//获取手机号码string phoneid = tm.getline1number();//记得在manifest file中添加<uses-permissionandroid:name="android.permission.read_phone_state" />//程序在模拟器上无法实现，必须连接手机 |
3.格式化string.xml 中的字符串
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// in strings.xml..<string name="my_text">thanks for visiting %s. you age is %d!</string>// and in the java code:string.format(getstring(r.string.my_text), "oschina", 33); |
4、android设置全屏的方法
a.在java代码中设置
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/** 全屏设置，隐藏窗口所有装饰 */requestwindowfeature(window.feature_no_title);getwindow().setflags(windowmanager.layoutparams.flag_fullscreen, windowmanager.layoutparams.flag_fullscreen); |
b、在androidmanifest.xml中配置
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<activity android:name=".login.netedit" android:label="@string/label_net_edit" android:screenorientation="portrait" android:theme="@android:style/theme.black.notitlebar.fullscreen"> <intent-filter> <action android:name="android.intent.net_edit" /> <category android:name="android.intent.category.default" /> </intent-filter></activity> |
5、设置activity为dialog的形式
在androidmanifest.xml中配置activity节点是配置theme如下：
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android:theme="@android:style/theme.dialog" |
6、检查当前网络是否连上
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connectivitymanager con=(connectivitymanager)getsystemservice(activity.connectivity_service);boolean wifi=con.getnetworkinfo(connectivitymanager.type_wifi).isconnectedorconnecting();boolean internet=con.getnetworkinfo(connectivitymanager.type_mobile).isconnectedorconnecting(); |
在androidmanifest.xml 增加权限：
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<uses-permission android:name="android.permission.access_network_state" /> |
7、检测某个intent是否有效
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public static boolean isintentavailable(context context, string action) { final packagemanager packagemanager = context.getpackagemanager(); final intent intent = new intent(action); list<resolveinfo> list = packagemanager.queryintentactivities(intent, packagemanager.match_default_only); return list.size() > 0;} |
8、android 拨打电话
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try { intent intent = new intent(intent.action_call); intent.setdata(uri.parse("tel:+110")); startactivity(intent);} catch (exception e) { log.e("sampleapp", "failed to invoke call", e);} |
9、android中发送email
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intent i = new intent(intent.action_send);//i.settype("text/plain"); //模拟器请使用这行i.settype("message/rfc822") ; // 真机上使用这行i.putextra(intent.extra_email, new string[]{"test@gmail.com","test@163.com});i.putextra(intent.extra_subject,"subject goes here");i.putextra(intent.extra_text,"body goes here");startactivity(intent.createchooser(i, "select email application.")); |
10、android中打开浏览器
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intent viewintent = new intent("android.intent.action.view",uri.parse("http://vaiyanzi.cnblogs.com"));startactivity(viewintent); |
11、android 获取设备唯一标识码
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string android_id = secure.getstring(getcontext().getcontentresolver(), secure.android_id); |
12、android中获取ip地址
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public string getlocalipaddress() { try { for (enumeration<networkinterface> en = networkinterface.getnetworkinterfaces(); en.hasmoreelements();) { networkinterface intf = en.nextelement(); for (enumeration<inetaddress> enumipaddr = intf.getinetaddresses(); enumipaddr.hasmoreelements();) { inetaddress inetaddress = enumipaddr.nextelement(); if (!inetaddress.isloopbackaddress()) { return inetaddress.gethostaddress().tostring(); } } } } catch (socketexception ex) { log.e(log_tag, ex.tostring()); } return null;} |
13、android获取存储卡路径以及使用情况
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/** 获取存储卡路径 */file sdcarddir=environment.getexternalstoragedirectory();/** statfs 看文件系统空间使用情况 */statfs statfs=new statfs(sdcarddir.getpath());/** block 的 size*/long blocksize=statfs.getblocksize();/** 总 block 数量 */long totalblocks=statfs.getblockcount();/** 已使用的 block 数量 */long availableblocks=statfs.getavailableblocks(); |
14 android中添加新的联系人
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private uri insertcontact(context context, string name, string phone) { contentvalues values = new contentvalues(); values.put(people.name, name); uri uri = getcontentresolver().insert(people.content_uri, values); uri numberuri = uri.withappendedpath(uri, people.phones.content_directory); values.clear(); values.put(contacts.phones.type, people.phones.type_mobile); values.put(people.number, phone); getcontentresolver().insert(numberuri, values); return uri;} |
15、查看电池使用情况
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intent intentbatteryusage = new intent(intent.action_power_usage_summary);startactivity(intentbatteryusage); |
16、获取进程号
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activitymanager mactivitymanager = (activitymanager) this.getsystemservice(activity_service);list<activitymanager.runningappprocessinfo> mrunningprocess = mactivitymanager.getrunningappprocesses();int i = 1;for (activitymanager.runningappprocessinfo amprocess : mrunningprocess) { log.e("homer application", (i++) + " pid = " + amprocess.pid + "; processname = " + amprocess.processname);} |
希望本文所述对大家android程序设计有所帮助。
