由上一个文章我们可以知道，分享到某个应用是传递一个Intent,那么调用系统分享实际上就是编写一个Intent。不多说，直接上代码，在需要调用的时候调用即可：

    public void shareText() {
        Intent shareIntent = new Intent();
        shareIntent.setAction(Intent.ACTION_SEND);
        shareIntent.putExtra(Intent.EXTRA_TEXT, "This is my Share text.");
        shareIntent.setType("text/plain");
        //设置分享列表的标题，并且每次都显示分享列表
        startActivity(Intent.createChooser(shareIntent, "分享到"));
    }

    //分享单张图片
    public void shareSingleImage(View view) {
        String imagePath = Environment.getExternalStorageDirectory() + File.separator + "test.jpg";
        //由文件得到uri
        Uri imageUri = Uri.fromFile(new File(imagePath));
        Log.d("share", "uri:" + imageUri);  //输出：file:///storage/emulated/0/test.jpg

        Intent shareIntent = new Intent();
        shareIntent.setAction(Intent.ACTION_SEND);
        shareIntent.putExtra(Intent.EXTRA_STREAM, imageUri);
        shareIntent.setType("image/*");
        startActivity(Intent.createChooser(shareIntent, "分享到"));
    }

    //分享多张图片
    public void shareMultipleImage(View view) {
        ArrayList<Uri> uriList = new ArrayList<>();

        String path = Environment.getExternalStorageDirectory() + File.separator;
        uriList.add(Uri.fromFile(new File(path+"australia_1.jpg")));
        uriList.add(Uri.fromFile(new File(path+"australia_2.jpg")));
        uriList.add(Uri.fromFile(new File(path+"australia_3.jpg")));

        Intent shareIntent = new Intent();
        shareIntent.setAction(Intent.ACTION_SEND_MULTIPLE);
        shareIntent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uriList);
        shareIntent.setType("image/*");
        startActivity(Intent.createChooser(shareIntent, "分享到"));
    }