文件的读写 和获取应用市场的名称

package com.cardvlaue.sys.util;import android.content.ContentResolver;import android.content.Context;import android.content.pm.ApplicationInfo;import android.content.pm.PackageManager;import android.database.Cursor;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Environment;import android.provider.ContactsContract;import android.text.TextUtils;import android.util.Base64;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.io.OutputStreamWriter;import java.io.StreamCorruptedException;import java.util.List;import java.util.Map;/** * <p>写文件和读取文件<p/> * Created by Administrator on 2016/8/10. */public class ReadUtil {    //文件的目录和路径    private final static String PATH = "/sdcard/digu";    private final static String FILENAME = "/notes.txt";    /**     * 向sdcard写文件     * 写文件     */    @SuppressWarnings("all")    public static void write(String str) {        try {            //1.判断是否存在sdcard            if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {                //目录                File path = new File(PATH);                //文件                File f = new File(PATH + FILENAME);                if (!path.exists()) {                    //2.创建目录，可以在应用启动的时候创建                    path.mkdirs();                }                if (!f.exists()) {                    //3.创建文件                    f.createNewFile();                } else if (f.exists()) {                    f.delete();                    f.createNewFile();                }                OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream(f));                //4.写文件，从EditView获得文本值                osw.write(str);                osw.close();            }        } catch (Exception e) {        }    }    /*     * 写文件     */    public static String read() {        //文件        File f = new File(PATH + FILENAME);        if (!f.exists()) {            return null;        }        FileInputStream is = null;        try {            is = new FileInputStream(f);            ByteArrayOutputStream bos = new ByteArrayOutputStream();            byte[] array = new byte[1024];            int len;//int len=-1;            while ((len = is.read(array)) != -1) {                bos.write(array, 0, len);                bos.close();                is.close();                return bos.toString();            }        } catch (IOException e) {            e.printStackTrace();            try {                is.close();            } catch (IOException e1) {                e1.printStackTrace();            }            return null;        }        return null;    }    /**     * 获取应用市场的名称     * @param context     * @param keyName     * @return     */    public static String readKey(Context context, String keyName) {        try {            ApplicationInfo app = context.getPackageManager().getApplicationInfo(                    context.getPackageName(), PackageManager.GET_META_DATA);            Bundle bundle = app.metaData;            String value = bundle.getString(keyName);            return value;        } catch (PackageManager.NameNotFoundException ex) {            return null;        }    }    /**     * 获取Email     * @param contentResolver     * @param map     * @param sb     * @param contactId     */    public  static void putEmail(ContentResolver contentResolver, Map<String,Object> map, StringBuilder sb, String contactId){        //查询Email类型的数据操作        Cursor emails = contentResolver.query(ContactsContract.CommonDataKinds.Email.CONTENT_URI,                null,                ContactsContract.CommonDataKinds.Email.CONTACT_ID + " = " + contactId,                null, null);        if(emails==null)  return;        String moveTo=""+emails.moveToNext();        if(moveTo.equals("false")){            map.put("email","");        }        while (emails.moveToNext())        {            String emailAddress = emails.getString(emails.getColumnIndex(                    ContactsContract.CommonDataKinds.Email.DATA));            //添加Email的信息            map.put("email", emailAddress);            sb.append(",Email=").append(emailAddress);        }        emails.close();    }    /**     * 获取Adress     * @param contentResolver     * @param map     * @param sb     * @param contactId     */    public static void putAdress(ContentResolver contentResolver,Map<String,Object> map,StringBuilder sb,String contactId){        //查询==地址==类型的数据操作.StructuredPostal.TYPE_WORK        Cursor address = contentResolver.query(ContactsContract.CommonDataKinds.StructuredPostal.CONTENT_URI,                null,                ContactsContract.CommonDataKinds.StructuredPostal.CONTACT_ID + " = " + contactId,                null, null);        if(address==null) return;        String moveToAddress=address.moveToNext()+"";        if(moveToAddress.equals("false")){            map.put("address","");        }        while (address.moveToNext())        {            String workAddress = address.getString(address.getColumnIndex(                    ContactsContract.CommonDataKinds.StructuredPostal.DATA));            //添加Email的信息            sb.append(",address").append(workAddress);            map.put("address", workAddress);        }        address.close();    }    /**     * 获取Company(公司)     * @param contentResolver     * @param map     * @param sb     * @param contactId     * @param id     */    public static void putCompany(ContentResolver contentResolver,Map<String,Object> map,StringBuilder sb,String contactId,String id) {        //查询==公司名字==类型的数据操作.Organization.COMPANY  ContactsContract.Data.CONTENT_URI        String orgWhere = ContactsContract.Data.CONTACT_ID + " = ? AND " + ContactsContract.Data.MIMETYPE + " = ?";        String[] orgWhereParams = new String[]{id,                ContactsContract.CommonDataKinds.Organization.CONTENT_ITEM_TYPE};        Cursor orgCur = contentResolver.query(ContactsContract.Data.CONTENT_URI,                null, orgWhere, orgWhereParams, null);        if(orgCur==null) return;        String moveToorgCur=orgCur.moveToNext()+"";        if(moveToorgCur.equals("false")){            map.put("company","");        }        if (orgCur.moveToFirst()) {            //组织名 (公司名字)            String company = orgCur.getString(orgCur.getColumnIndex(ContactsContract.CommonDataKinds.Organization.DATA));            //职位            String title = orgCur.getString(orgCur.getColumnIndex(ContactsContract.CommonDataKinds.Organization.TITLE));            sb.append(",company").append(company);            sb.append(",title").append(title);            map.put("company", company);            //map.put("title", title);        }        orgCur.close();    }    /**     * 压缩图片     * @param options     * @param minSideLength     * @param maxNumOfPixels     * @return     */    public static int computeSampleSize(BitmapFactory.Options options,                                        int minSideLength, int maxNumOfPixels) {        int initialSize = computeInitialSampleSize(options, minSideLength,                maxNumOfPixels);        int roundedSize;        if (initialSize <= 8) {            roundedSize = 1;            while (roundedSize < initialSize) {                roundedSize <<= 1;            }        } else {            roundedSize = (initialSize + 7) / 8 * 8;        }        return roundedSize;    }    private static int computeInitialSampleSize(BitmapFactory.Options options,                                                int minSideLength, int maxNumOfPixels) {        double w = options.outWidth;        double h = options.outHeight;        int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math                .sqrt(w * h / maxNumOfPixels));        int upperBound = (minSideLength == -1) ? 128 : (int) Math.min(Math                .floor(w / minSideLength), Math.floor(h / minSideLength));        if (upperBound < lowerBound) {            // return the larger one when there is no overlapping zone.            return lowerBound;        }        if ((maxNumOfPixels == -1) && (minSideLength == -1)) {            return 1;        } else if (minSideLength == -1) {            return lowerBound;        } else {            return upperBound;        }    }}