我正在尝试获取内容URI的文件路径 . URL如下所示：content：//com.android.providers.downloads.documents/document/31
游标对象不为null，但cursor.getString（column_index）返回null .
列索引始终为0 .
public static String getPath(Context context, Uri uri) throws URISyntaxException {
if ("content".equalsIgnoreCase(uri.getScheme())) {
String[] projection = { "data"};
Cursor cursor = null;
try {
cursor = context.getContentResolver().query(uri, projection, null, null, null);
int column_index = cursor.getColumnIndexOrThrow( "_data");
if (cursor.moveToFirst()) {
// Method returns here with null value
return cursor.getString(column_index);
}
} catch (Exception e) {
// Eat it
}
}
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
编辑：内容URI从文件管理器返回，因此它应代表一个实际的文件 .
public void filePicker(View view) {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("*/*");
intent.addCategory(Intent.CATEGORY_OPENABLE);
try {
startActivityForResult(
Intent.createChooser(intent, "Select a File to Upload"),
FILE_SELECT_CODE);
} catch (android.content.ActivityNotFoundException ex) {
// Potentially direct the user to the Market with a Dialog
Toast.makeText(this, "Please install a File Manager.",
Toast.LENGTH_SHORT).show();
}
}
1 回答
不要求
content://Uri指向文件，更不用说可以访问的文件了 . 如果要访问文件中的数据，请使用ContentResolver和openInputStream()或openOutputStream().