AssetsCopyUtil.java

package suda.sudamodweather.util;

import android.content.Context;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * Created by ghbha on 2016/4/27.
 */
public class AssetsCopyUtil {
    /**
     * 将asseet当中的数据库文件拷到程序目录
     */
    public static void copyEmbassy2Databases(Context activity,
                                             String filePath, String fileName) {

        File oldfile = new File(filePath, fileName);

        if (oldfile.exists())
            return;

        File file = new File(filePath, fileName);

        if (file.exists())
            return;

        file.getParentFile().mkdirs();

        InputStream in = null;
        OutputStream out = null;

        try {

            out = new FileOutputStream(file);
            byte[] buff = new byte[1024];
            int len = 0;
            in = activity.getAssets().open(fileName);
            while ((len = in.read(buff)) > 0) {
                out.write(buff, 0, len);
            }
            out.flush();
            in.close();

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (out != null)
                    out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}