Android resources are divided into two types of resource files can be compiled under the res, the resource file that is automatically generated ID of the resource file in R.Java inside, access is very simple, just call R.XXX. id can; the second is to put assets folder below the native resource files placed in the folder the following files are not compiled R file, it is not as straightforward as the first use .Android provides a tool class to help us get a file under the operating assets file: AssetManager
Introduce Functions
String[] list(String path);//列出该目录下的下级文件和文件夹名称InputStream open(String fileName);//以顺序读取模式打开文件，默认模式为ACCESS_STREAMING
InputStream open(String fileName, int accessMode);//以指定模式打开文件。读取模式有以下几种：
//ACCESS_UNKNOWN : 未指定具体的读取模式
//ACCESS_RANDOM : 随机读取
//ACCESS_STREAMING : 顺序读取
//ACCESS_BUFFER : 缓存读取
void close()//关闭AssetManager实例Load the page in the assets directory
webView.loadUrl("file:///android_asset/html/index.htmll");Description: This way you can load the page in the assets directory, and the pages about css, js, pictures and other files are also loaded.
Load picture resources in the assets directory
InputStream is = getAssets().open(fileName);
bitmap = BitmapFactory.decodeStream(is);
ivImg.setImageBitmap(bitmap);Load text files in a directory assets
InputStream is = getAssets().open(fileName);
int lenght = is.available();
byte[] buffer = new byte[lenght];
is.read(buffer);
String result = = new String(buffer, "utf8");Load music catalog assets
// 打开指定音乐文件,获取assets目录下指定文件的AssetFileDescriptor对象
AssetFileDescriptor afd = am.openFd(music);
mPlayer.reset();
// 使用MediaPlayer加载指定的声音文件。
mPlayer.setDataSource(afd.getFileDescriptor(),
afd.getStartOffset(), afd.getLength());
// 准备声音
mPlayer.prepare();
// 播放
mPlayer.start(); Loading video assets under directory
private void initview() {
vv = (CustomVideoView) view.findViewById(R.id.videoView111);
//vv.setVideoPath("/mnt/hd/Wonder Girls - Nobody.avi");
Uri uri = copyFile("one.3gp");
vv.setVideoURI(uri);
vv.start();
}
public Uri copyFile(String name) {
try {
File dir = getActivity().getFilesDir();
File file = new File(dir, name);
if (file.exists()) {
Log.d("Test", "=========file exist=========");
return Uri.fromFile(file);
} else {
file.createNewFile();
OutputStream os = new FileOutputStream(file);
InputStream is = getActivity().getAssets().open(name);
byte[] buffer = new byte[1024];
int bufferRead = 0;
while((bufferRead = is.read(buffer)) != -1) {
os.write(buffer, 0, bufferRead);
}
os.flush();
is.close();
os.close();
Log.d("Test", "=========copyFile success=========");
return Uri.fromFile(file);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}Get raw resource directory and file the return flow path
/**
* 获取raw目录下的资源
*
* @param resId 资源id
*/
public static InputStream getRawStream(Context context, int resId) {
return context.getResources().openRawResource(resId);
}/**
* 获取raw目录下的资源
*
* @param resId 资源id
*/
public static String getRawFilePath(Context context, int resId) {
return "android.resource://" + context.getPackageName() + "/" + resId;
}
Copy the file to the specified path in assets
/**
从assets目录中复制整个文件夹内容
@param context Context 使用CopyFiles类的Activity
@param oldPath String 原文件路径 如：/aa
@param newPath String 复制后路径 如：xx:/bb/cc
*/
public void copyFilesFassets(Context context,String oldPath,String newPath) {
try {
String fileNames[] = context.getAssets().list(oldPath);//获取assets目录下的所有文件及目录名
if (fileNames.length > 0) {//如果是目录
File file = new File(newPath);
file.mkdirs();//如果文件夹不存在，则递归
for (String fileName : fileNames) {
copyFilesFassets(context,oldPath + "/" + fileName,newPath+"/"+fileName);
}
} else {//如果是文件
InputStream is = context.getAssets().open(oldPath);
FileOutputStream fos = new FileOutputStream(new File(newPath));
byte[] buffer = new byte[1024];
int byteCount=0;
while((byteCount=is.read(buffer))!=-1) {//循环从输入流读取 buffer字节
fos.write(buffer, 0, byteCount);//将读取的输入流写入到输出流
}
fos.flush();//刷新缓冲区
is.close();
fos.close();
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
//如果捕捉到错误则通知UI线程
MainActivity.handler.sendEmptyMessage(COPY_FALSE);
}
}
The following is a complete tool category code directly copied to the project you can use
package com.insworks.lib_datas.utils;
import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.util.Log;
import java.io.Closeable;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
/**
* @ProjectName: AndroidTemplateProject2
* @Package: com.insworks.lib_datas.utils
* @ClassName: AssetsUtil
* @Author: Song Jian
* @CreateDate: 2019/8/8 14:33
* @UpdateUser: 更新者
* @UpdateDate: 2019/8/8 14:33
* @UpdateRemark: 更新说明
* @Version: 1.0
* @Description: Assets和raw文件文件读取工具类
* <p>
* String[] list(String path);//列出该目录下的下级文件和文件夹名称
* <p>
* InputStream open(String fileName);//以顺序读取模式打开文件，默认模式为ACCESS_STREAMING
* <p>
* InputStream open(String fileName, int accessMode);//以指定模式打开文件。读取模式有以下几种：
* //ACCESS_UNKNOWN : 未指定具体的读取模式
* //ACCESS_RANDOM : 随机读取
* //ACCESS_STREAMING : 顺序读取
* //ACCESS_BUFFER : 缓存读取
*/
public class AssetsUtil {
/**
* 获取assets目录下的网页
* 这种方式可以加载assets目录下的网页，并且与网页有关的css，js，图片等文件也会的加载。
* webView.loadUrl("file:///android_asset/html/index.html");
*
* @param filePath
*/
public static String getHtml(String filePath) {
return "file:///android_asset/" + filePath;
}
/**
* 获取所有文件
*
* @param path 目录
* @return
*/
public static String[] getfiles(Context context, String path) {
AssetManager assetManager = context.getAssets();
String[] files = null;
try {
files = assetManager.list(path);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
assetManager.close();
}
return files;
}
/**
* 获取assets目录下的图片资源
*
* @param fileName
*/
public static Bitmap getPic(Context context, String fileName) {
InputStream is = null;
Bitmap bitmap = null;
try {
is = context.getAssets().open(fileName);
bitmap = BitmapFactory.decodeStream(is);
} catch (IOException e) {
e.printStackTrace();
} finally {
close(is);
}
return bitmap;
}
/**
* 关闭流
*
* @param is
*/
private static void close(Closeable... is) {
for (Closeable i : is) {
try {
i.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 获取assets目录下的文本资源
*
* @param fileName
*/
public static String getTex(Context context, String fileName) {
InputStream is = null;
String result = "";
try {
is = context.getAssets().open(fileName);
int lenght = is.available();
byte[] buffer = new byte[lenght];
is.read(buffer);
result = new String(buffer, "utf8");
} catch (IOException e) {
e.printStackTrace();
} finally {
close(is);
}
return result;
}
/**
* 获取assets目录下的音频资源
*
* @param fileName
*/
public static AssetFileDescriptor getAudio(Context context, String fileName) {
AssetFileDescriptor afd = null;
try {
// 打开指定音乐文件,获取assets目录下指定文件的AssetFileDescriptor对象
afd = context.getAssets().openFd(fileName);
// MediaPlayer mPlayer=new MediaPlayer();
// mPlayer.reset();
// // 使用MediaPlayer加载指定的声音文件。
// mPlayer.setDataSource(afd.getFileDescriptor(),
// afd.getStartOffset(), afd.getLength());
// // 准备声音
// mPlayer.prepare();
// // 播放
// mPlayer.start();
} catch (IOException e) {
e.printStackTrace();
} finally {
close(afd);
}
return afd;
}
/**
* 获取assets目录下的URI
* 可用于播放视频资源
*
* @param fileName
*/
public static Uri getUri(Context context, String fileName) {
File file = getFile(context, fileName);
//播放视频
// VideoView mVideoView = new VideoView(context);
// mVideoView.setVideoURI(Uri.fromFile(file));
// mVideoView.start();
return Uri.fromFile(file);
}
/**
* 将流拷贝到本地 然后返回本地file 默认拷贝到Files目录
*
* @param context
* @param name
* @return
*/
public static File getFile(Context context, String name) {
InputStream is = null;
FileOutputStream os = null;
try {
File dir = context.getFilesDir();
File file = new File(dir, name);
if (file.exists()) {
return file;
} else {
file.createNewFile();
os = new FileOutputStream(file);
is = context.getAssets().open(name);
byte[] buffer = new byte[1024];
int bufferRead = 0;
while ((bufferRead = is.read(buffer)) != -1) {
os.write(buffer, 0, bufferRead);
}
os.flush();
is.close();
os.close();
Log.d("Test", "=========getFile success=========");
return file;
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
close(is, os);
}
return null;
}
/**
* 获取raw目录下的资源
*
* @param resId 资源id
*/
public static InputStream getRawStream(Context context, int resId) {
return context.getResources().openRawResource(resId);
}
/**
* 获取raw目录下的资源
*
* @param resId 资源id
*/
public static String getRawFilePath(Context context, int resId) {
return "android.resource://" + context.getPackageName() + "/" + resId;
}
/**
* 从assets目录中复制内容到sd卡中
*
* @param context Context 使用CopyFiles类的Activity
* @param assetPath String 原文件路径 如：/aa
* @param newPath String 复制后路径 如：xx:/bb/cc
*/
public static void copyFilesFassets(Context context, String assetPath, String newPath) {
InputStream is = null;
FileOutputStream fos = null;
try {
String fileNames[] = context.getAssets().list(assetPath);//获取assets目录下的所有文件及目录名
if (fileNames.length > 0) {//如果是目录
File file = new File(newPath);
file.mkdirs();//如果文件夹不存在，则递归
for (String fileName : fileNames) {
copyFilesFassets(context, assetPath + "/" + fileName, newPath + "/" + fileName);
}
} else {//如果是文件
is = context.getAssets().open(assetPath);
fos = new FileOutputStream(new File(newPath));
byte[] buffer = new byte[1024];
int byteCount = 0;
while ((byteCount = is.read(buffer)) != -1) {//循环从输入流读取 buffer字节
fos.write(buffer, 0, byteCount);//将读取的输入流写入到输出流
}
fos.flush();//刷新缓冲区
is.close();
fos.close();
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
//如果捕捉到错误则通知UI线程
} finally {
close(is, fos);
}
}
}
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