尝试使用您的Application实例的以下代码（您应该在清单中编写该类）：该代码将资产/文件文件夹的内容复制到应用程序的缓存文件夹中（您可以将其他路径放在copyAssetFolder（）函数中）。仅在首次启动应用程序时
import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import android.app.Application;import android.content.Context;import android.content.res.AssetManager;import android.preference.PreferenceManager;public class MyApplication extends Application { private static Context s_sharedContext; @Override public void onCreate () { super.onCreate();if (!PreferenceManager.getDefaultSharedPreferences( getApplicationContext()) .getBoolean("installed", false)) { PreferenceManager.getDefaultSharedPreferences( getApplicationContext()) .edit().putBoolean("installed", true).commit(); copyAssetFolder(getAssets(), "files", "/data/data/com.example.appname/files"); } } private static boolean copyAssetFolder(AssetManager assetManager, String fromAssetPath, String toPath) { try { String[] files = assetManager.list(fromAssetPath); new File(toPath).mkdirs(); boolean res = true; for (String file : files) if (file.contains(".")) res &= copyAsset(assetManager, fromAssetPath + "/" + file, toPath + "/" + file); else res &= copyAssetFolder(assetManager, fromAssetPath + "/" + file, toPath + "/" + file); return res; } catch (Exception e) { e.printStackTrace(); return false; } } private static boolean copyAsset(AssetManager assetManager, String fromAssetPath, String toPath) { InputStream in = null; OutputStream out = null; try { in = assetManager.open(fromAssetPath); new File(toPath).createNewFile(); out = new FileOutputStream(toPath); copyFile(in, out); in.close(); in = null; out.flush(); out.close(); out = null; return true; } catch(Exception e) { e.printStackTrace(); return false; } } private static void copyFile(InputStream in, OutputStream out) throws IOException { byte[] buffer = new byte[1024]; int read; while((read = in.read(buffer)) != -1){ out.write(buffer, 0, read); } }}
