此处类似的帖子没有帮助的答案...... 我想创建带文件附件的电子邮件，文件在内部存储上。 这是代码：
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("text/plain");
i.putExtra(Intent.EXTRA_EMAIL , new String[]{email});
i.putExtra(Intent.EXTRA_SUBJECT, "Smart Weight Tracker");
i.putExtra(Intent.EXTRA_TEXT , "CSV file is in attachment");
Uri uri;
if(useExternal){
uri = Uri.fromFile(new File(this.getExternalFilesDir(null),fname));
}
else{
File f = new File(this.getFilesDir(),fname);
f.setReadable(true, false);
f.setWritable(true, false);
uri = Uri.fromFile(f);
}
i.putExtra(Intent.EXTRA_STREAM, uri);
try {
startActivity(Intent.createChooser(i, "Send mail..."));
} catch (android.content.ActivityNotFoundException ex) {
Toast.makeText(MainActivity.this, "There are no email clients installed.", Toast.LENGTH_SHORT).show();
}
它与外部存储完美配合，但在使用内部存储时我没有附加功能。 我检查了 - 文件打开了，（通过显示Toast在我的应用程序中显示的长度 - 还可以，＆gt; 0）。
我这样写：
OutputStreamWriter out =
new OutputStreamWriter(con.openFileOutput(fname, Context.MODE_WORLD_READABLE));
在logcat中我看到了
I/Gmail (28480): >>>>> Attachment uri: file:///data/data/Android.MyApp/files /31.10.2011.csv
I/Gmail (28480): >>>>> type: text/plain
I/Gmail (28480): >>>>> name: 31.10.2011.csv
I/Gmail (28480): >>>>> size: 0
Size == 0!
有什么想法吗？
答案 0 :(得分：5)
您好， 尝试使用内容提供商。
emailIntent.putExtra(Intent.EXTRA_STREAM,Uri.parse("content://" + CachedFileProvider.AUTHORITY + "/"+ fileName));
........ Android：将文件从内部缓存附加到Gmail
package com.stephendnicholas.gmailattach;
import java.io.File;
import java.io.FileNotFoundException;
import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.net.Uri;
import android.os.ParcelFileDescriptor;
import android.util.Log;
public class CachedFileProvider extends ContentProvider {
private static final String CLASS_NAME = "CachedFileProvider";
// The authority is the symbolic name for the provider class
public static final String AUTHORITY = "com.stephendnicholas.gmailattach.provider";
// UriMatcher used to match against incoming requests
private UriMatcher uriMatcher;
@Override
public boolean onCreate() {
uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
// Add a URI to the matcher which will match against the form
// 'content://com.stephendnicholas.gmailattach.provider/*'
// and return 1 in the case that the incoming Uri matches this pattern
uriMatcher.addURI(AUTHORITY, "*", 1);
return true;
}
@Override
public ParcelFileDescriptor openFile(Uri uri, String mode)
throws FileNotFoundException {
String LOG_TAG = CLASS_NAME + " - openFile";
Log.v(LOG_TAG,
"Called with uri: '" + uri + "'." + uri.getLastPathSegment());
// Check incoming Uri against the matcher
switch (uriMatcher.match(uri)) {
// If it returns 1 - then it matches the Uri defined in onCreate
case 1:
// The desired file name is specified by the last segment of the
// path
// E.g.
// 'content://com.stephendnicholas.gmailattach.provider/Test.txt'
// Take this and build the path to the file
String fileLocation = getContext().getCacheDir() + File.separator
+ uri.getLastPathSegment();
// Create & return a ParcelFileDescriptor pointing to the file
// Note: I don't care what mode they ask for - they're only getting
// read only
ParcelFileDescriptor pfd = ParcelFileDescriptor.open(new File(
fileLocation), ParcelFileDescriptor.MODE_READ_ONLY);
return pfd;
// Otherwise unrecognised Uri
default:
Log.v(LOG_TAG, "Unsupported uri: '" + uri + "'.");
throw new FileNotFoundException("Unsupported uri: "
+ uri.toString());
}
}
// //////////////////////////////////////////////////////////////
// Not supported / used / required for this example
// //////////////////////////////////////////////////////////////
@Override
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;
}
}
<provider android:name="CachedFileProvider" android:authorities="com.stephendnicholas.gmailattach.provider">
public static void createCachedFile(Context context, String fileName,
String content) throws IOException {
File cacheFile = new File(context.getCacheDir() + File.separator
+ fileName);
cacheFile.createNewFile();
FileOutputStream fos = new FileOutputStream(cacheFile);
OutputStreamWriter osw = new OutputStreamWriter(fos, "UTF8");
PrintWriter pw = new PrintWriter(osw);
pw.println(content);
pw.flush();
pw.close();
}
public static Intent getSendEmailIntent(Context context, String email,
String subject, String body, String fileName) {
final Intent emailIntent = new Intent(
android.content.Intent.ACTION_SEND);
//Explicitly only use Gmail to send
emailIntent.setClassName("com.google.android.gm","com.google.android.gm.ComposeActivityGmail");
emailIntent.setType("plain/text");
//Add the recipients
emailIntent.putExtra(android.content.Intent.EXTRA_EMAIL,
new String[] { email });
emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, subject);
emailIntent.putExtra(android.content.Intent.EXTRA_TEXT, body);
//Add the attachment by specifying a reference to our custom ContentProvider
//and the specific file of interest
emailIntent.putExtra(
Intent.EXTRA_STREAM,
Uri.parse("content://" + CachedFileProvider.AUTHORITY + "/"
+ fileName));
return emailIntent;
}
答案 1 :(得分：1)
Uri fileUri = Uri.fromFile(new File(context.getCacheDir()+ "/"+ fileName));
Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
emailIntent.setType("text/plain");
emailIntent.putExtra(android.content.Intent.EXTRA_SUBJECT,
"Test Subject");
emailIntent.putExtra(android.content.Intent.EXTRA_TEXT,
"go on read the emails");
emailIntent.putExtra(Intent.EXTRA_STREAM, fileUri);
startActivity(emailIntent);
请尝试此代码。希望这会有所帮助。
答案 2 :(得分：0)
我正在按照stephendnicholas代码进行数小时的思考，因为我的设备没有SD卡，因此我无法将文件写入内部存储空间。
创建我的＆＃34;内部＆＃34;像这样的文件对我来说很好：
File file = new File(getExternalFilesDir(null), filename); // :)
它在附件中避免了Gmail限制。
在此之前，我正在创建我的文件对象：
File file = new File(this.getFilesDir(), filename); //will not attach
但是，如果您的文件实际上来自内部存储，那么如果您有疯狂的Android技能，则stephendnicholas内容提供商等工作。