Question

我在一个棘手的问题上需要帮助。我编写了一个应用程序，可以使用SD卡上提供的文件 - 操作此文件 - 并将其写回SD卡。到现在为止还挺好。通过SD仿真，Eclipse环境中的一切都运行良好。一旦我在Sony Xperia上安装应用程序 - 该应用程序在SD卡上找不到该文件 - 我也无法找到我在SD卡上存储/创建的文件/目录。我正在发行我为索尼写的测试应用程序，并请您就此问题寻求帮助！

以下是该应用的代码段 - 尝试创建目录：

public class IOTestActivity extends ActionBarActivity {

private boolean mExternalStorageAvailable;
private boolean mExternalStorageWriteable;

TextView debugInfo;
TextView availInfo;
TextView writeInfo;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_iotest);

    debugInfo = (TextView)findViewById(R.id.iotestLbLDebugInfo);
    checkSDCard();
    fillView();
    readSDCard();
}


private void readSDCard() {

    debugInfo.append("...start reading SD dirs\n\n");
    if ((mExternalStorageAvailable==true) &&
            (mExternalStorageWriteable == true)) {

        File root = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
        debugInfo.append("SD-Root='" + root + "'\n");

        File newDir = new File (root, "TEST");
        boolean result = newDir.mkdir();
        debugInfo.append("...creating new dir '" + newDir + "' = " + result);
    }       
}


private void fillView() {

    debugInfo.setText("...entering IO Test\n");
    debugInfo.append("...reading SD-card availability\n");

    availInfo = (TextView)findViewById(R.id.iotestLblInfo1);
    availInfo.setText("" + mExternalStorageAvailable);

    debugInfo.append("...reading SD-card writing rights\n");

    writeInfo = (TextView)findViewById(R.id.iotestLblInfo2);
    writeInfo.setText("" + mExternalStorageWriteable);

}


private void checkSDCard() {
    String state = Environment.getExternalStorageState();

    if (Environment.MEDIA_MOUNTED.equals(state)) {
        // Can read and write the media
        mExternalStorageAvailable = mExternalStorageWriteable = true;
    } else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
        // Can only read the media
        mExternalStorageAvailable = true;
        mExternalStorageWriteable = false;
    } else {
        // Can't read or write
        mExternalStorageAvailable = mExternalStorageWriteable = false;
    }   
}
  }

当然我已添加到我的Manifest.xml：

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" >

这是app的测试输出：

顺便说一句：如果我使用的话，问题独立于：

File root = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);

或

File root = Environment.getExternalStorageDirectory();

当我通过文件浏览器通过USB连接的手机访问SD卡时，我总是收到相同的SD卡内容：

感谢您的帮助！

找不到写入SD卡的文件/目录

0 个答案: