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首页 / 操作系统 / Linux / Android---常用代码片段的分享

开发过程中,经常用到的一些Android代码片段,在此分享一下,希望对大家有所帮助....

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);