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

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

//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

android: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

// in strings.xml..

Thanks for visiting %s. You age is %d!

// 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

/** 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

android:screenOrientation="portrait" android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen">

5、设置Activity为Dialog的形式

在AndroidManifest.xml中配置Activity节点是配置theme如下：

android:theme="@android:style/Theme.Dialog"

6、检查当前网络是否连上

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：

7、检测某个Intent是否有效

public static boolean isIntentAvailable(Context context, String action) {

final PackageManager packageManager = context.getPackageManager();

final Intent intent = new Intent(action);

List list =

packageManager.queryIntentActivities(intent,

PackageManager.MATCH_DEFAULT_ONLY);

return list.size() > 0;

}

8、android 拨打电话

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

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

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

String android_id = Secure.getString(getContext().getContentResolver(), Secure.ANDROID_ID);

12、android中获取IP地址

public String getLocalIpAddress() {

try {

for (Enumeration en = NetworkInterface.getNetworkInterfaces();

en.hasMoreElements();) {

NetworkInterface intf = en.nextElement();

for (Enumeration 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

/** 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

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

Intent intentBatteryUsage = new Intent(Intent.ACTION_POWER_USAGE_SUMMARY);

startActivity(intentBatteryUsage);

16、获取进程号

ActivityManager mActivityManager = (ActivityManager) this.getSystemService(ACTIVITY_SERVICE);

List 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。