我用这个:

AndroidManifest.xml

AndroidManifest.xml

<provider android:name="com.myapp.main.MyContentProvider" android:authorities="com.myapp.main"></provider>

按钮点击:

        public void onClick(View v) {

            List<Intent> targetedShareIntents = new ArrayList<Intent>();
             Intent shareIntent = new Intent(Intent.ACTION_SEND);
             shareIntent.setType("image/jpg");
             Uri theUri = Uri.parse("content://com.myapp.main/"+srcImage);
             List<ResolveInfo> resInfo = getPackageManager().queryIntentActivities(shareIntent, 0);
             int i=0;
             List<ResolveInfo> reInfoToDelete = new ArrayList<ResolveInfo>();
             if (!resInfo.isEmpty()){
                    for (ResolveInfo resolveInfo : resInfo) {
                        String packageName = resolveInfo.activityInfo.packageName;
                        Intent targetedShareIntent = new Intent(android.content.Intent.ACTION_SEND);
                        targetedShareIntent.setType("image/jpg");
                        targetedShareIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "Share file");
                        if (packageName.equals("com.google.android.gm")){
                             targetedShareIntent.setType("image/png");

                             targetedShareIntent.putExtra(Intent.EXTRA_TEXT, "some text");
                             targetedShareIntent.putExtra(Intent.EXTRA_STREAM, theUri);
                             targetedShareIntent.setPackage(packageName);
                             targetedShareIntents.add(targetedShareIntent);

                        }
                    }



                    startActivity(targetedShareIntents.remove(0));
               }
        }

我的内容提供者类

    public class MyContentProvider extends ContentProvider implements PipeDataWriter<InputStream>{

    @Override
    public AssetFileDescriptor openAssetFile(Uri uri, String mode) throws FileNotFoundException {
        //Adapt this to your code
        AssetManager am = getContext().getAssets();
        String file_name = "path/"+uri.getLastPathSegment();
        if(file_name == null)
            throw new FileNotFoundException();
        AssetFileDescriptor afd = null;
        try {
            afd = am.openFd(file_name);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return afd;//super.openAssetFile(uri, mode);
    }

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public String getType(Uri uri) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public boolean onCreate() {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection,
            String[] selectionArgs, String sortOrder) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public int update(Uri uri, ContentValues values, String selection,
            String[] selectionArgs) {
        // TODO Auto-generated method stub
        return 0;
    }

    public void writeDataToPipe(ParcelFileDescriptor arg0, Uri arg1,
            String arg2, Bundle arg3, InputStream arg4) {
        // Transfer data from the asset to the pipe the client is reading.
        byte[] buffer = new byte[8192];
        int n;
        FileOutputStream fout = new FileOutputStream(arg0.getFileDescriptor());
        try {
            while ((n=arg4.read(buffer)) >= 0) {
                fout.write(buffer, 0, n);
            }
        } catch (IOException e) {
            Log.i("InstallApk", "Failed transferring", e);
        } finally {
            try {
                arg4.close();
            } catch (IOException e) {
            }
            try {
                fout.close();
            } catch (IOException e) {
            }
        }
    }
}