Android写文件到Sd卡的一般过程

注意权限：在mainfest添加WRITE权限！
package com.example.writesdcard;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import android.app.Activity;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.view.Menu;import android.view.MenuItem;public class MainActivity extends Activity {    @Override      protected void onCreate(Bundle savedInstanceState) {          super.onCreate(savedInstanceState);            // 首先判断设备是否挂载SDCard          boolean isMounted = Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);            if (isMounted) {              try {                 writeFileToSDCard("强哥","你妹.txt");              } catch (IOException e) {                  e.printStackTrace();              }          } else {              Log.d("SDCard错误", "未安装SDCard！");          }      }           private void writeFileToSDCard(String path,String name) throws IOException {                File parent_path = Environment.getExternalStorageDirectory();            // 可以建立一个子目录专门存放自己专属文件          File dir = new File(parent_path.getAbsoluteFile(),path);          dir.mkdir();            File file = new File(dir.getAbsoluteFile(), name);            Log.d("文件路径", file.getAbsolutePath());            // 创建这个文件，如果不存在          file.createNewFile();            FileOutputStream fos = new FileOutputStream(file);            String data = "hello,world! IT @ CSDN";          byte[] buffer = data.getBytes();            // 开始写入数据到这个文件。          fos.write(buffer, 0, buffer.length);          fos.flush();          fos.close();            Log.d("文件写入", "成功");      }  }
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