Android开发常用经典代码段集锦

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);

//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

// 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);

/** 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);

<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>

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

ConnectivityManager con=(ConnectivityManager)getSystemService(Activity.CONNECTIVITY_SERVICE);boolean wifi=con.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting();boolean internet=con.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).isConnectedOrConnecting();

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

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;}

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);}

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."));

Intent viewIntent = new  Intent("android.intent.action.VIEW",Uri.parse("http://vaiyanzi.cnblogs.com"));startActivity(viewIntent);

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

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;}

/** 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();

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;}

Intent intentBatteryUsage = new Intent(Intent.ACTION_POWER_USAGE_SUMMARY);startActivity(intentBatteryUsage);

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);}