Question

我正在尝试使用FileProvider通过电子邮件共享SQL数据库文件。

错误：

java.lang.IllegalArgumentException: Failed to find configured root that contains /data/data/com.columbiawestengineering.columbiawest/databases/testresults.db

我的代码：

<paths xmlns:android="http://schemas.android.com/apk/res/android">
<files-path name="test_results" path="databases/"/>
</paths>

的Manifest.xml：

    <provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="com.columbiawestengineering.columbiawest"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/file_paths" />
    </provider>

Java.code：

    File goob = this.getDatabasePath("testresults.db");
    Log.d("LOG PRINT SHARE DB", "File goob..? getDatabasePath.. here it is: " + goob.toString());

    Uri contentUri = FileProvider.getUriForFile(this, "com.columbiawestengineering.columbiawest", goob);
    Log.d("LOG PRINT SHARE DB", "contentUri got: here is contentUri: " + contentUri.toString());

此外，Logcat for goob显示正确的数据库位置：

....../com.columbiawestengineering.columbiawest D/LOG PRINT SHARE DB: File goob..? getDatabasePath.. here it is: /data/data/com.columbiawestengineering.columbiawest/databases/testresults.db

任何帮助？

从developer.android看来，xml files-path ...表示文件/子目录。但这不是文件存储的位置。我不知所措。

Answer 1

解决了（感谢@CommonsWare）。 FileProvider无法访问SQL数据库文件，因为它位于数据库目录中。我只是将文件从数据库目录复制到文件目录（以便FileProvider可以访问它），添加权限，将其附加到电子邮件，然后在使用start和onActivityForResult（）发送电子邮件时从文件目录中删除数据库方法。

我的Java现在看起来像这样：

    //this copies the .db file from dabases dir where FileProvider cannot access it and moves it to files dir
    File booger = copyFileToFilesDir("testresults.db");
    Log.d("LOG PRINT SHARE DB", "we found a booger, Here it is: " + booger.toString());

    Uri contentUri = FileProvider.getUriForFile(this, "com.columbiawestengineering.columbiawest", booger);
    Log.d("LOG PRINT SHARE DB", "contentUri got: here is contentUri: " + contentUri.toString());

以下是我复制文件的方法：

private File copyFileToFilesDir(String fileName) {
    File file = null;
    String newPath = getFileStreamPath("").toString();
    Log.d("LOG PRINT SHARE DB", "newPath found, Here is string: " + newPath);
    String oldPath = getDatabasePath("testresults.db").toString();
    Log.d("LOG PRINT SHARE DB", "oldPath found, Her is string: " + oldPath);
    try {
        File f = new File(newPath);
        f.mkdirs();
        FileInputStream fin = new FileInputStream(oldPath);
        FileOutputStream fos = new FileOutputStream(newPath + "/" + fileName);
        byte[] buffer = new byte[1024];
        int len1 = 0;
        while ((len1 = fin.read(buffer)) != -1) {
            fos.write(buffer, 0, len1);
        }
        fin.close();
        fos.close();
        file = new File(newPath + "/" + fileName);
        if (file.exists())
            return file;
    } catch (Exception e) {

    }
    return null;
}

Answer 2

此外，Logcat for goob显示正确的数据库位置：

是的，但那不是// Expand the CardView private boolean expand(View cardView) { // Make the shortened ("intro") text invisible and make the full text visible mIntroTextView.setVisibility(View.GONE); mExpandableIndicator.setVisibility(View.GONE); mCollapseIndicator.setVisibility(View.VISIBLE); mInfoTextView.setVisibility(View.VISIBLE); return true; } // Collapse the CardView private boolean collapse(View cardView) { // Make the shortened ("intro") text visible and make the full text invisible mInfoTextView.setVisibility(View.GONE); mCollapseIndicator.setVisibility(View.GONE); mExpandableIndicator.setVisibility(View.VISIBLE); mIntroTextView.setVisibility(View.VISIBLE); return false; }指向的地方。鉴于该数据库路径，等效的<files-path>将是：

getFilesDir()

因此，您的数据库不在/data/data/com.columbiawestengineering.columbiawest/files目录中，这是getFilesDir()使用的目录，这就是<files-path>不满意的原因。 FileProvider不支持从数据库目录共享内容。

Android：FileProvider“找不到配置的根”

2 个答案: