android - 保存文件的更改？

Question

我的 SD 卡上有一个文件。当我正常打开并用“officesuite”更改时，我可以保存更改。当我如下在我的应用程序中打开它时，“officesuite”会显示它但它无法保存更改并且绝不会返回到我的 Activity 。有什么想法吗？
这是我的代码:

import java.io.File;
import java.net.URI;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.webkit.MimeTypeMap;

public class OfficesuiteSaveAsActivity extends Activity {
    private String fileDir;
    private File file;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedlnstanceState) {
        super.onCreate(savedlnstanceState);
        setContentView(R.layout.main);
        String sdCardDir = Environment.getExternalStorageDirectory()
                .getAbsolutePath();
        String fileName = "TestofficeSuite.docx";
        fileDir = sdCardDir + File.separator + fileName;
        file = new File(fileDir);
        displayFile(file.toURI());
    }

    public void displayFile(URI uriString) {
        Uri data = Uri.parse(uriString.toString());
        Intent newlntent1 = new Intent();
        newlntent1.setAction(Intent.ACTION_VIEW);
        MimeTypeMap mtm = MimeTypeMap.getSingleton();
        newlntent1.setDataAndType(data, mtm.getMimeTypeFromExtension("docx"));
        startActivity(newlntent1);
    }
}

Answer 1

我检查 sdcard 中文件的“Uri.parse(file.toURI().toString())”和“Uri.fromFile()”的值:“Uri.parse(file.toURI().toString())”以“file:/mnt/...”开头，“Uri.fromFile()”以“file:///mnt/...”开头!所以我更改了代码并且它工作正常:

public class OfficesuiteSaveAsActivity extends Activity {
    private String fileDir;
    private File file;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedlnstanceState) {
        super.onCreate(savedlnstanceState);
        setContentView(R.layout.main);
        String sdCardDir = Environment.getExternalStorageDirectory()
                .getAbsolutePath();
        String fileName = "TestofficeSuite.docx";
        fileDir = sdCardDir + File.separator + fileName;
        file = new File(fileDir);
        displayFile(file);
    }

    public void displayFile(File file) {
        Uri data = Uri.fromFile(file);
        Intent newlntent1 = new Intent();
        newlntent1.setAction(Intent.ACTION_VIEW);
        MimeTypeMap mtm = MimeTypeMap.getSingleton();
        newlntent1.setDataAndType(data, mtm.getMimeTypeFromExtension("docx"));
        startActivity(newlntent1);
    }
}