Android复制assets文件到SD卡

public class CopyAssetsToSd {
final ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(1, 2, 1, TimeUnit.SECONDS,
new LinkedBlockingQueue<Runnable (100));
private Context mContext;
/**
* assets的文件夹 js
*/
private String assetDir;
/**
* 目标文件夹
*/
private String dir;
public CopyAssetsToSd(Context context, String assetDir, String dir) {
mContext = context;
this.assetDir = assetDir;
this.dir = dir;
new MyAsyncTask().execute();
}
/**
* 监听复制完成
*/
public interface onCopyListener {
void success();
}
private onCopyListener mOnCopyListener;
public void setOnCopyListener(onCopyListener onCopyListener) {
this.mOnCopyListener = onCopyListener;
}
public void copyAssets(final String assetDir, final String dir) {
//下面是线程池的方法
threadPoolExecutor.execute(new Runnable() {
@Override
public void run() {
String[] files;
AssetManager assetManager = mContext.getResources().getAssets();
try {
// 获得Assets文件夹下指定文件夹一共有多少文件
files = assetManager.list(assetDir);
} catch (IOException e1) {
return;
}
final File mWorkingPath = new File(dir);
// 如果文件路径不存在
if (!mWorkingPath.exists()) {
mWorkingPath.mkdirs();
}
for (int i = 0; i < files.length; i++) {
int finalI = i;
try {
// 获得每个文件的名字
String fileName = files[finalI];
File outFile = new File(mWorkingPath + "/" + fileName);
// 判断文件是否存在
if (!outFile.exists()) {
outFile.createNewFile();
FileOutputStream out = new FileOutputStream(outFile);
InputStream in = null;
if (0 != assetDir.length())
in = assetManager.open(assetDir + "/" + fileName);
else
in = assetManager.open(fileName);
// Transfer bytes from in to out
byte[] buf = new byte[1024];
int len;
while ((len = in.read(buf))   0) {
out.write(buf, 0, len);
}
in.close();
out.close();
} else {
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
});
//下面是线程的方法
//    new Thread(new Runnable() {
//      @Override
//      public void run() {
//        String[] files;
//        AssetManager assetManager = mContext.getResources().getAssets();
//        try {
//          // 获得Assets一共有几多文件
//          files = assetManager.list(assetDir);
//        } catch (IOException e1) {
//          return;
//        }
//        final File mWorkingPath = new File(dir);
//        // 如果文件路径不存在
//        if (!mWorkingPath.exists()) {
//          mWorkingPath.mkdirs();
//        }
//
//        for (int i = 0; i < files.length; i++) {
//          int finalI = i;
//
//          try {
//            // 获得每个文件的名字
//            String fileName = files[finalI];
//            File outFile = new File(mWorkingPath + "/" + fileName);
//            // 判断文件是否存在
//            if (!outFile.exists()) {
//              outFile.createNewFile();
//              FileOutputStream out = new FileOutputStream(outFile);
//              InputStream in = null;
//              if (0 != assetDir.length())
//                in = assetManager.open(assetDir + "/" + fileName);
//              else
//                in = assetManager.open(fileName);
//              // Transfer bytes from in to out
//              byte[] buf = new byte[1024];
//              int len;
//              while ((len = in.read(buf))   0) {
//                out.write(buf, 0, len);
//              }
//              in.close();
//              out.close();
//            } else {
//
//
//            }
//          } catch (FileNotFoundException e) {
//            e.printStackTrace();
//          } catch (IOException e) {
//            e.printStackTrace();
//          }
//        }
//
//      }
//
//    }).start();
}
class MyAsyncTask extends AsyncTask<String, Void, Bitmap  {
//onPreExecute用于异步处理前的操作
@Override
protected void onPreExecute() {
super.onPreExecute();
}
//在doInBackground方法中进行异步任务的处理.
@Override
protected Bitmap doInBackground(String... params) {
copyAssets(assetDir, dir);
return null;
}
//onPostExecute用于UI的更新.此方法的参数为doInBackground方法返回的值.
@Override
protected void onPostExecute(Bitmap bitmap) {
super.onPostExecute(bitmap);
if (mOnCopyListener != null) {
//复制完成的监听
mOnCopyListener.success();
}
}
}
}