我正在使用 ContentProvider 发送带有附件的电子邮件。
- 首先,我将文件写入缓存目录。
- 然后我为内容提供者找到的每个文件创建一个带有 URL 的电子邮件
- 然后我开始一个带有 ACTION_SEND_MULTIPLE 意图的新活动。
- 我选择gmail,然后点击发送按钮。
这有时会起作用,它似乎在一段时间内第一次起作用,但在随后的尝试后不起作用......但并不总是这样。
当它不起作用时,电子邮件会卡在 gmail 中发送。这发生在 2.3.3 和 4.0.1 上,在 gmail 客户端中打开邮件并点击发送按钮经常会导致邮件几乎立即发送,但并非每次都发送。
使用 Google Drive 打开 Intent 的行为与 gmail 相同。
到目前为止,使用内置交换邮件客户端打开 Intent 始终有效。
这是发送电子邮件的代码:
Intent sendIntent = new Intent(Intent.ACTION_SEND_MULTIPLE);
sendIntent.putExtra(Intent.EXTRA_EMAIL, exportParams.emailAddresses);
sendIntent.putExtra(Intent.EXTRA_SUBJECT, "Leader Activity Report");
sendIntent.putExtra(Intent.EXTRA_TEXT, "Leader Activity Report, see attached file.");
Uri fileUri = CachedFileProvider.createFileUri(result.fileName);
if (L.dbg())
L.dbg("Using uri:" + fileUri.toString());
ArrayList<Uri> uris = new ArrayList<Uri>();
uris.add(fileUri);
Uri fileUri2 = CachedFileProvider.createFileUri(result.fileNameDayByDay);
uris.add(fileUri2);
if (L.dbg())
L.dbg("Using uri2:" + fileUri2.toString());
sendIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
sendIntent.setType("text/plain");
parent.startActivity(sendIntent);
这是内容提供者
public class CachedFileProvider extends ContentProvider {
private static final String CLASS_NAME = "CachedFileProvider";
public static final String AUTHORITY = "com.josh.lll.file.provider";
private UriMatcher uriMatcher;
@Override
public boolean onCreate() {
uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
uriMatcher.addURI(AUTHORITY, "*", 1);
return true;
}
@Override
public ParcelFileDescriptor openFile(Uri uri, String mode)
throws FileNotFoundException {
try {
String LOG_TAG = CLASS_NAME + " - openFile";
Log.v(LOG_TAG,
"Called with uri: '" + uri + "' - " + uri.getLastPathSegment());
switch (uriMatcher.match(uri)) {
case 1:
String fileLocation = getContext().getCacheDir() + File.separator
+ uri.getLastPathSegment();
Log.i(CLASS_NAME,"Returning file :"+fileLocation);
ParcelFileDescriptor pfd = ParcelFileDescriptor.open(new File(
fileLocation), ParcelFileDescriptor.MODE_READ_ONLY);
return pfd;
default:
Log.v(LOG_TAG, "Unsupported uri: '" + uri + "'.");
throw new FileNotFoundException("Unsupported uri: "
+ uri.toString());
}
} catch (FileNotFoundException t) {
Bug.major(this, t, "Could not return file descriptor");
throw t;
} catch (RuntimeException t) {
Bug.major(this, t, "Could not return file descriptor");
throw t;
} catch (Error t) {
Bug.major(this, t, "Could not return file descriptor");
throw t;
}
}
public static String createFullyQualifiedFileName(Context c, String fileNamePart) {
File cacheDir = c.getCacheDir();
Log.i(CLASS_NAME,"Using cache dir:"+cacheDir);
return cacheDir + File.separator + fileNamePart;
}
public static Uri createFileUri(String fileNamePart) {
return Uri.parse("content://" + AUTHORITY + "/"+ fileNamePart);
}
public int update(Uri uri, ContentValues contentvalues, String s,
String[] as) {
return 0;
}
@Override
public int delete(Uri uri, String s, String[] as) {
return 0;
}
@Override
public Uri insert(Uri uri, ContentValues contentvalues) {
return null;
}
@Override
public String getType(Uri uri) {
return null;
}
@Override
public Cursor query(Uri uri, String[] projection, String s, String[] as1,
String s1) {
return null;
}
}
对于成功和“停滞”的电子邮件,gmail 会打印以下日志消息:
04-03 22:17:35.027: I/Gmail(13206): >>>>> Attachment uri: content://com.josh.lll.file.provider/report_20100401_20130402_LeadetJosh_3_1364980653516.csv
04-03 22:17:35.035: I/Gmail(13206): >>>>> type: text/plain
04-03 22:17:35.035: I/Gmail(13206): >>>>> size: 0
04-03 22:17:35.054: I/Gmail(13206): >>>>> Attachment uri: content://com.josh.lll.file.provider/backup_20100401_20130402_LeadetJosh_3_1364980653516_day_by_day.lll
04-03 22:17:35.054: I/Gmail(13206): >>>>> type: text/plain
04-03 22:17:35.054: I/Gmail(13206): >>>>> size: 0