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这是我在网上找到的将一个文件从资产复制到内部存储的原始代码：

Context Context = getApplicationContext();
String DestinationFile = Context.getFilesDir().getPath() + File.separator + "DB.sqlite";
if (!new File(DestinationFile).exists()) {
  try {
    CopyFromAssetsToStorage(Context, "Database/DB.sqlite", DestinationFile);
  } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
  }
}

private void CopyFromAssetsToStorage(Context Context, String SourceFile, String DestinationFile) throws IOException {
  InputStream IS = Context.getAssets().open(SourceFile);
  OutputStream OS = new FileOutputStream(DestinationFile);
  CopyStream(IS, OS);
  OS.flush();
  OS.close();
  IS.close();
}
private void CopyStream(InputStream Input, OutputStream Output) throws IOException {
  byte[] buffer = new byte[5120];
  int length = Input.read(buffer);
  while (length > 0) {
    Output.write(buffer, 0, length);
    length = Input.read(buffer);
  }
}

上面的代码可以很好地复制一个文件。但是，我想要的是复制多个文件而不是一个文件。在 MT8 之后，我将代码修改为以下内容：

public class MainActivity extends Activity{

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

            ArrayList<String> destFiles = new ArrayList<String>();
            destFiles.add("FileB.jpg");
            destFiles.add("FileC.jpg");
            destFiles.add("FileD.jpg");

            for(int i =0 ; i < destFiles.size(); i++) {
            Context Context = getApplicationContext();
            String DestinationFile = Context.getFilesDir().getPath() + File.separator + "FileA.db";
            if (!new File(DestinationFile).exists()) {
              try {
                CopyFromAssetsToStorage(Context, "database/FileA.db", destFiles.get(i));
              } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
              }
            }
            }
    }

            private void CopyFromAssetsToStorage(Context Context, String SourceFile, String DestinationFile) throws IOException {
              InputStream IS = Context.getAssets().open(SourceFile);
              OutputStream OS = new FileOutputStream(DestinationFile);
              CopyStream(IS, OS);
              OS.flush();
              OS.close();
              IS.close();
            }
            private void CopyStream(InputStream Input, OutputStream Output) throws IOException {
              byte[] buffer = new byte[5120];
              int length = Input.read(buffer);
              while (length > 0) {
                Output.write(buffer, 0, length);
                length = Input.read(buffer);
              }
            }
}

但是，不会复制文件。我做错了什么部分？

4

1 回答 1

1 
Step 1 : u need to put the All files name in Arraylist first say ArrayList<String> destFiles .
ArrayList<String> destFiles = new ArrayList<String>(); 
destFiles.add("FileA");
destFiles.add("FileB"); 
destFiles.add("FileC");

Step 2 : For loop :

for(int i=0;i<destFiles.size;i++)
{
Context Context = getApplicationContext();
String DestinationFile = Context.getFilesDir().getPath() + File.separator + "DB.sqlite";
if (!new File(DestinationFile).exists()) {
  try {
    CopyFromAssetsToStorage(Context, "Database/DB.sqlite", destFiles.get(i));
  } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
  }
}

private void CopyFromAssetsToStorage(Context Context, String SourceFile, String DestinationFile) throws IOException {
  InputStream IS = Context.getAssets().open(SourceFile);
  OutputStream OS = new FileOutputStream(DestinationFile);
  CopyStream(IS, OS);
  OS.flush();
  OS.close();
  IS.close();
}
private void CopyStream(InputStream Input, OutputStream Output) throws IOException {
  byte[] buffer = new byte[5120];
  int length = Input.read(buffer);
  while (length > 0) {
    Output.write(buffer, 0, length);
    length = Input.read(buffer);
  }
}
}
于 2013-10-24T02:23:29.267 回答