本文示例主要实现了Android获取assets文件夹中的数据并将其写入到SD卡中，该程序实现的步骤主要为：首先读取assets文件夹中的数据库，再将其写入到SD存储卡中。

完整示例代码如下：

import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import android.content.Context;/*将assets文件夹下的数据库写入SD卡中 * @author Dave */public class WriteToSD { private Context context; String filePath = android.os.Environment.getExternalStorageDirectory()+"/weather"; public WriteToSD(Context context){ this.context = context; if(!isExist()){ write(); } } private void write(){ InputStream inputStream; try { inputStream = context.getResources().getAssets().open("addressId.db"); File file = new File(filePath); if(!file.exists()){ file.mkdirs(); } FileOutputStream fileOutputStream = new FileOutputStream(filePath + "/database.db"); byte[] buffer = new byte[512]; int count = 0; while((count = inputStream.read(buffer)) > 0){ fileOutputStream.write(buffer, 0 ,count); } fileOutputStream.flush(); fileOutputStream.close(); inputStream.close(); System.out.println("success"); } catch (IOException e) { e.printStackTrace(); } } private boolean isExist(){ File file = new File(filePath + "/database.db"); if(file.exists()){ return true; }else{ return false; } }}