调用系统分享功能

//分享文字
Intent intent = new Intent(Intent.ACTION_SEND);
intent.putExtra(Intent.EXTRA_TEXT, "要分享的文本。");
intent.setType("text/plain");
startActivity(Intent.createChooser(intent, "分享"));

//分享图片
Uri uri = Uri.fromFile(new File("/storage/emulated/0/DCIM/Camera/img.jpg"));
Intent intent = new Intent(Intent.ACTION_SEND);
intent.putExtra(Intent.EXTRA_STREAM, uri);
intent.setType("image/jpeg");
startActivity(Intent.createChooser(intent, "分享"));

//分享一系列图片
ArrayList<Uri> uris = new ArrayList<>();
uris.add(Uri.fromFile(new File("/storage/emulated/0/DCIM/Camera/img.jpg")));
uris.add(Uri.fromFile(new File("/storage/emulated/0/DCIM/Camera/aaa.jpeg")));

Intent intent = new Intent(Intent.ACTION_SEND_MULTIPLE);
intent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
intent.setType("image/*");
startActivity(Intent.createChooser(intent, "分享"));

调用系统分享功能

原文：http://blog.csdn.net/qiantujava/article/details/44195031