Commonly used tools in Android 02

1. Read mobile phone contact information

It is generally used to read and upload the address book on a mobile phone.

Import java. util. arrayList; import java. util. list; import android. content. contentResolver; import android. content. context; import android. database. cursor; import android. provider. contactsContract. commonDataKinds. phone; import android. text. textUtils; import com. iss. starwish. bean. phoneContact;/*** read mobile phone contact information */public class ReadPhoneContactUtil {/*** use content observer or mobile phone contact information **/public static List
 
  
GetPhoneContacts (Context mContext) {List
  
   
PhoneContacts = new ArrayList
   
    
(); ContentResolver resolver = mContext. getContentResolver (); String [] PHONES_PROJECTION = new String [] {Phone. NUMBER, Phone. DISPLAY_NAME}; // obtain the mobile phone contact Cursor phoneCursor = resolver. query (Phone. CONTENT_URI, PHONES_PROJECTION, null); if (phoneCursor! = Null) {while (phoneCursor. moveToNext () {// obtain the mobile phone number String phoneNumber = phoneCursor. getString (0); // when the mobile phone number is empty or empty, the current loop if (TextUtils. isEmpty (phoneNumber) continue; // obtain the contact name String contactName = phoneCursor. getString (1); phoneContacts. add (new PhoneContact (contactName, phoneNumber) ;}return phoneContacts ;}}
   
  
 

2. Obtain the resource id by the Resource Name

This is most commonly used in international or one-click topic modification. Different string identifiers are switched based on different language environments. Different topics are switched based on different file names.

Package net. tianyouwang. utils; import android. content. Context;/*** use the field name to dynamically obtain the resource id. This class can be dynamically obtained through the field name. */Public class ResourceUtil {public static int getLayoutId (Context context, String paramString) {return context. getResources (). getIdentifier (paramString, "layout", context. getPackageName ();} public static int getStringId (Context context, String paramString) {return context. getResources (). getIdentifier (paramString, "string", context. getPackageName ();} public static int getDrawableId (Context context, String paramString) {return context. getResources (). getIdentifier (paramString, "drawable", context. getPackageName ();} public static int getStyleId (Context context, String paramString) {return context. getResources (). getIdentifier (paramString, "style", context. getPackageName ();} public static int getId (Context context, String paramString) {return context. getResources (). getIdentifier (paramString, "id", context. getPackageName ();} public static int getColorId (Context context, String paramString) {return context. getResources (). getIdentifier (paramString, "color", context. getPackageName ();} public static int getAnimationId (Context context, String paramString) {return context. getResources (). getIdentifier (paramString, "anim", context. getPackageName ();} public static int getBooleanId (Context context, String paramString) {return context. getResources (). getIdentifier (paramString, "bool", context. getPackageName ();} public static int getArrayId (Context context, String paramString) {return context. getResources (). getIdentifier (paramString, "array", context. getPackageName ());}}

3. Operations on SDCARD status and remaining SDCARD capacity

Import java. io. file; import java. io. fileOutputStream; import java. io. IOException; import android. OS. environment; import android. OS. statFs; import android. text. textUtils;/*** determine the remaining capacity of the SDCard **/public class SDCardAvailableUtils {private static final int imageSize = 1*1024*1024; // 1 M public static boolean isExistSDCard () {if (android. OS. environment. getExternalStorageState (). equals (android. OS. environme Nt. MEDIA_MOUNTED) & getAvailableStore (Environment. getExternalStorageDirectory (). getPath ()> imageSize) {return true;} else return false;} public static void saveDatatoLocalFile (String data, String filePath) {if (! TextUtils. isEmpty (data )&&! TextUtils. isEmpty (filePath) {File file = new File (filePath); FileOutputStream outStr = null; try {if (! File. exists () {file. createNewFile () ;}outstr = new FileOutputStream (file); if (outStr! = Null) {outStr. write (data. getBytes (); outStr. flush () ;}} catch (IOException e) {e. printStackTrace ();} finally {if (outStr! = Null) {try {outStr. close ();} catch (IOException e) {e. printStackTrace () ;}finally {outStr = null ;}}}/ *** get the remaining memory capacity, the Unit is byte ** @ param filePath * @ return availableSpare */public static long getAvailableStore (String filePath) {// get the path of the sdcard file StatFs statFs = new StatFs (filePath ); // obtain the block SIZE long blocSize = statFs. getBlockSize (); // obtain the number of blocks long totalBlocks = statFs. getBlockCount (); // The number of blocks that can be used long availaBlock = statFs. getAvailableBlocks (); long total = totalBlocks * blocSize; // total storage space long availableSpare = availaBlock * blocSize; // return availableSpare ;}}