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);
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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-permission
android:name="android.permission.read_phone_state" />
//程序在模拟器上无法实现，必须连接手机
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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);
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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);
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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>
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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"
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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();
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在androidmanifest.xml 增加权限：
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<uses-permission android:name="android.permission.access_network_state" />
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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;
}
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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);
}
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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."));
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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);
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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);
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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;
}
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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();
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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;
}
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15、查看电池使用情况
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intent intentbatteryusage = new intent(intent.action_power_usage_summary);
startactivity(intentbatteryusage);
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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);
}
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希望本文所述对大家android程序设计有所帮助。