1、读取手机联系人信息

一般用在读取手机通讯录上传，这一块比較多。

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;
/*** 读取手机联系人信息*/
public class ReadPhoneContactUtil {/*** 通过内容观察者，或者手机联系人相关的信息**/public  static  List<PhoneContact> getPhoneContacts(Context mContext) {List<PhoneContact> phoneContacts = new ArrayList<PhoneContact>();ContentResolver resolver = mContext.getContentResolver();String[] PHONES_PROJECTION = new String[] { Phone.NUMBER,Phone.DISPLAY_NAME };// 获取手机联系人Cursor phoneCursor = resolver.query(Phone.CONTENT_URI,PHONES_PROJECTION, null, null, null);if (phoneCursor != null) {while (phoneCursor.moveToNext()) {// 得到手机号码String phoneNumber = phoneCursor.getString(0);// 当手机号码为空的或者为空字段 跳过当前循环if (TextUtils.isEmpty(phoneNumber))continue;// 得到联系人名称String contactName = phoneCursor.getString(1);phoneContacts.add(new PhoneContact(contactName,phoneNumber));}}return phoneContacts;}}

2、通过资源的名称来获取资源id

这个最经常使用的是在国际化或者一键改动主题这一块。依据不同的语言环境，切换不同的字符串标识。

依据不同的文件名称，切换不同的主题

package net.tianyouwang.utils;import android.content.Context;/*** 通过字段名称来动态的获取资源的id，再来使用。此类，能够通过字段名称动态获取id。*/
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、SDCARD状态和SDCARD剩余容量的操作

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;import android.os.Environment;
import android.os.StatFs;
import android.text.TextUtils;
/**** SDCard的剩余容量推断操作**/
public class SDCardAvailableUtils {private static final int imageSize = 1*1024*1024;//1Mpublic static boolean isExistSDCard() {if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)&& getAvailableStore(Environment.getExternalStorageDirectory().getPath()) > imageSize) {return true;} elsereturn 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;}}}}}/*** 获取存储卡的剩余容量，单位为字节* * @param filePath* @return availableSpare*/public static long getAvailableStore(String filePath) {// 取得sdcard文件路径StatFs statFs = new StatFs(filePath);// 获取block的SIZElong blocSize = statFs.getBlockSize();// 获取BLOCK数量long totalBlocks = statFs.getBlockCount();// 可使用的Block的数量long availaBlock = statFs.getAvailableBlocks();long total = totalBlocks * blocSize;//总的存储空间long availableSpare = availaBlock * blocSize;//当前可用存储空间return availableSpare;}}