android获取本地文件名字

我写了个例子，你看能用吗

package comdragonredandroidutils;

import javaioBufferedWriter;

import javaioByteArrayOutputStream;

import javaioFile;

import javaioFileInputStream;

import javaioFileOutputStream;

import javaioIOException;

import javaioOutputStreamWriter;

import javaioRandomAccessFile;

import javatextSimpleDateFormat;

import javautilDate;

import androidcontentContext;

import androidcontentSharedPreferences;

import androidosEnvironment;

import androidutilLog;

public final class FileUtils {

public final static String PACKAGE_PATH = "comdragonredandroid";

// public final static String LOG_FILE_NAME = "smartprinttxt";

// public final static String LOG_FILE_PATH = STORE_DIRECTORY_PATH + FileseparatorChar + LOG_FILE_NAME;

/

read key value from preference by key name

@param context

@param keyName

@return

/

public final static String readPreperence(Context context, String keyName) {

SharedPreferences settings = contextgetSharedPreferences(

PACKAGE_PATH, 0);

return settingsgetString(keyName, "");

}

/

write key name and key value into preference

@param context

@param keyName

@param keyValue

/

public final static void writePreperence(Context context, String keyName,

String keyValue) {

SharedPreferences settings = contextgetSharedPreferences(

PACKAGE_PATH, 0);

SharedPreferencesEditor editor = settingsedit();

editorputString(keyName, keyValue);

editorcommit();

}

/

delete key from preference by key name

@param context

@param keyName

/

public final static void deletePreperence(Context context, String keyName) {

SharedPreferences settings = contextgetSharedPreferences(

PACKAGE_PATH, 0);

SharedPreferencesEditor editor = settingsedit();

editorremove(keyName);

editorcommit();

}

public final static String getContextFilePath(Context context, String fileName) {

return contextgetFilesDir()getAbsolutePath() + FileseparatorChar + fileName;

}

public final static boolean existContextFile(Context context, String fileName) {

String filePath = contextgetFilesDir()getAbsolutePath() + FileseparatorChar + fileName;

Logd("filePath", filePath);

File file = new File(filePath);

if (fileexists()) {

return true;

}

return false;

}

public final static void saveContextFile(Context context, String fileName, String content) throws Exception {

FileOutputStream outputStream = contextopenFileOutput(fileName, ContextMODE_PRIVATE);

outputStreamwrite(contentgetBytes());

outputStreamclose();

}

public final static void saveAppendContextFile(Context context, String fileName, String content) throws Exception {

FileOutputStream outputStream = contextopenFileOutput(fileName, ContextMODE_APPEND);

outputStreamwrite(contentgetBytes());

outputStreamclose();

}

public final static void deleteContextFile(Context context, String fileName) throws Exception {

contextdeleteFile(fileName);

}

public final static String readContextFile(Context context, String fileName) throws Exception {

FileInputStream inputStream = contextopenFileInput(fileName);

byte[] buffer = new byte[1024];

ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();

int len = -1;

while ((len = inputStreamread(buffer)) != -1) {

byteArrayOutputStreamwrite(buffer, 0, len);

}

byte[] data = byteArrayOutputStreamtoByteArray();

byteArrayOutputStreamclose();

inputStreamclose();

return new String(data);

}

/

delete file or folders

@param file

/

public final static void deleteFile(File file) {

if (fileexists()) {

if (fileisFile()) {

filedelete();

} else if (fileisDirectory()) {

File files[] = filelistFiles();

for (int i = 0; i < fileslength; i++) {

deleteFile(files[i]);

}

}

filedelete();

} else {

Logd("deleteFile", "The file or directory does not exist!");

}

}

/

make directory on SD card

@param dirPath

@return

/

public final static boolean makeDir(String dirPath) {

File dir = new File(dirPath);

if(!dirisDirectory()) {

if (dirmkdirs()) {

return true;

}

} else {

return true;

}

return false;

}

/

write log file

@param filePath

@param tag

@param content

/

public final static void writeLog(String filePath, String tag, String content) {

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

String logDateTime = sdfformat(new Date());

writeFileByAppend(filePath, logDateTime + "---[" + tag + "]---" + content + "\n");

}

/

write file by append mode

@param filePath

@param content

/

public final static void writeFileByAppend(String filePath, String content) {

// FileWriter writer = null;

// try {

// writer = new FileWriter(filePath, true);

// writerwrite(content);

// } catch (IOException e) {

// eprintStackTrace();

// } finally {

// try {

// writerclose();

// } catch (IOException e) {

// eprintStackTrace();

// }

// }

RandomAccessFile randomFile = null;

try {

randomFile = new RandomAccessFile(filePath, "rw");

long fileLength = randomFilelength();

randomFileseek(fileLength);

randomFilewrite(contentgetBytes());

} catch (IOException e) {

eprintStackTrace();

} finally {

try {

randomFileclose();

} catch (IOException e) {

eprintStackTrace();

}

}

// BufferedWriter out = null;

// try {

// out = new BufferedWriter(new OutputStreamWriter(

// new FileOutputStream(filePath, true), "UTF-8"));

// outwrite(content);

// } catch (Exception e) {

// eprintStackTrace();

// } finally {

// try {

// outclose();

// } catch (IOException e) {

// eprintStackTrace();

// }

// }

}

/

write file by overwrite mode

@param filePath

@param content

/

public final static void writeFile(String filePath, String content) {

// FileWriter writer = null;

// try {

// writer = new FileWriter(filePath, true);

// writerwrite(content);

// } catch (IOException e) {

// eprintStackTrace();

// } finally {

// try {

// writerclose();

// } catch (IOException e) {

// eprintStackTrace();

// }

// }

BufferedWriter out = null;

try {

out = new BufferedWriter(new OutputStreamWriter(

new FileOutputStream(filePath, false), "UTF-8"));

outwrite(content);

} catch (Exception e) {

eprintStackTrace();

} finally {

try {

outclose();

} catch (IOException e) {

eprintStackTrace();

}

}

}

/

check SD card whether or not exist

@param context

@return

/

public final static boolean checkSDCard(Context context) {

if (EnvironmentMEDIA_MOUNTEDequals(Environment

getExternalStorageState())) {

return true;

} else {

// ToastmakeText(context, "Please check your SD card! ",

// ToastLENGTH_SHORT)show();

return false;

}

}

/

read last line from file

@param filePath

@return

/

public final static String readLastLinefromFile(String filePath) {

RandomAccessFile raf = null;

try {

File file = new File(filePath);

if (!fileexists()) {

return null;

}

raf = new RandomAccessFile(filePath, "r");

long len = raflength();

if (len == 0L) {

return "";

} else {

long pos = len - 1;

while (pos > 0) {

pos--;

rafseek(pos);

if (rafreadByte() == '\n') {

break;

}

}

if (pos == 0) {

rafseek(0);

}

byte[] bytes = new byte[(int) (len - pos)];

rafread(bytes);

return new String(bytes);

}

} catch (Exception e) {

eprintStackTrace();

} finally {

if (raf != null) {

try {

rafclose();

} catch (Exception e2) {

}

}

}

return null;

}

}

Cursor mCursor = null;

String[] mAudiocols = new String[] {

MediaStoreAudioMediaTITLE,

MediaStoreAudioMediaDURATION,

MediaStoreAudioMediaARTIST,

MediaStoreAudioMedia_ID,

MediaStoreAudioMediaSIZE,

MediaStoreAudioMediaDATA,

MediaStoreAudioMediaDISPLAY_NAME,

MediaStoreAudioMediaBOOKMARK,

MediaStoreAudioMediaALBUM

};

mCursor =getContentResolver()query(MediaStoreAudioMediaEXTERNAL_CONTENT_URI,mAudiocols,"is_music=1",null,MediaStoreAudioMediaTITLE);

mTotalFiles = mCursorgetCount();

while(mCurrentPos < mTotalFiles){

mCurrentPos++；

mCursormoveToPosition(mCurrentPos);

mCursorgetColumnIndexOrThrow(MediaStoreAudioMediaTITLE));

}

具体没看过，大概流程：

client端的AudioSystem中调用getParameters,调用到IAudioFlinger，然后调用到libs下的AudioFlinger::getParameters，再下去就是要看每个系统了，我们是自己的硬件系统，所以无法给你更多的提示。

目测，你需要建立至少两个类 A -> dir B->dir1，每个类的字段嘛就是这个节点下的所有属性和子节点属性名 然后通过DOM、SAX或者XmlPullParser等来解析

用下面这种方式能实现查询实现查询sd卡某一个子目录下的文件详细信息 ：

//selection: 指定查询条件

String selection = MediaStoreImagesMediaDATA + " like %";

//设定查询目录

String path="/mnt/sdcard/youpicpath";

//定义selectionArgs：

String[] selectionArgs = {path+"%"};

c = thisgetContentResolver()query(MediaStoreImagesMediaEXTERNAL_CONTENT_URI, null,

selection, selectionArgs, null);

其实原理就是改变了下查询语句，在查询条件中增加了MediaStoreImagesMediaDATA字段的限制条件，必须是和指定目录能匹配的才被查询，注意selection和selectionArgs参数是配合使用的。

先获取读取文件的权限，再遍历文件夹及子文件夹，直到结束就可以了。

private void getAllFiles(File root,ArrayList<File> results){

File files[] = rootlistFiles();

if(files != null){

for (File f : files){

if(fisDirectory()){

getAllFiles(f,results);

}

else{

String name = fgetName();

String extension

= namesubstring(namelastIndexOf(""));

if(extensionEqual("pdf")){

resultsadd(f);

}

}

}

}

}

您好，Android的res文件夹是用来存储资源的，可以在res文件夹下建立一个raw文件夹，放置在raw文件夹下的内容会被原样打包，而不会被编译成二进制文件，并且可以通过R文件进行很方便地访问。

比如我们可以将更新信息、版权信息等放到txt文件中，然后放到raw文件中，然后很方便地进行访问。

在raw中放入一个atxt文件，然后就可以在Activity中使用getResources()openRawResource(Rrawa);方法获取一个此文件的InputStream类，而后就可以很方便地进行读写atxt了。

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