android 开发中常用到的一些代码片段（一）

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    <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:

// 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

/** 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

<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：

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：

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

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<ResolveInfo> 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<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：

/** 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);