【初级】eclipse下读写SD卡代码实现

public void readSd(View view){

    //注意：高版本4.0之后，读sdcard还需要android.permission.READ_EXTERNAL_STORAGE
    try {
        File file = new File("/mnt/sdcard/sdtest.txt");

        FileInputStream fis = new FileInputStream(file);

        BufferedReader br = new BufferedReader(new InputStreamReader(fis));

        String str = br.readLine();

        br.close();
        fis.close();

        Toast.makeText(this, "读到:" + str, Toast.LENGTH_SHORT).show();

    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }


}

public void writeSd(View view){

    //应用程序写sdcard需要申请权限，具体为：
    //android.permission.WRITE_EXTERNAL_STORAGE
    try {
        // /sdcard  和 /mnt/sdcard/  是样效果
        File file = new File("/sdcard/sdtest.txt");

        FileOutputStream fos = new FileOutputStream(file);

        fos.write("hello".getBytes());

        fos.close();

        Toast.makeText(this, "写sdcard卡成功", Toast.LENGTH_SHORT).show();
    } catch (Exception e) {
        Toast.makeText(this, "写sdcard卡失败", Toast.LENGTH_SHORT).show();
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

}