安卓SD卡输入输出

<!-- 在SDCard中创建与删除文件权限 -->
<uses -permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"></uses>
<!-- 往SDCard写入数据权限 -->
<uses -permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses>

<uses -sdk android:minSdkVersion="3"></uses>

// 写文件
try {
    File myFile = new File("/sdcard/mysdfile.txt");
    myFile.createNewFile(); // 创建文件
    FileOutputStream fOut = new FileOutputStream(myFile);
    OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);
    myOutWriter.append(i); // 填内容
    myOutWriter.close();
    fOut.close();
    Toast.makeText(SongsActivity.this, "写入文件成功", Toast.LENGTH_LONG)
        .show();
} catch (Exception e) {
    Toast.makeText(SongsActivity.this, "写入文件失败" + e, Toast.LENGTH_SHORT)
        .show();
}
// 读文件
File file = new File("/sdcard/mysdfile.txt");
try {
    FileInputStream inputStream = new FileInputStream(file);
    byte[] b = new byte[inputStream.available()];
    inputStream.read(b);
    String cc = new String(b);
    Toast.makeText(SongsActivity.this, "读取文件成功", Toast.LENGTH_LONG)
        .show();
    getListView().setDividerHeight(Integer.parseInt(cc));
} catch (Exception e) {
    Toast.makeText(SongsActivity.this, "读取失败" + e, Toast.LENGTH_SHORT)
        .show();
}