先来看看实现效果：

也不过多介绍了，直接上代码：

  private void openMail() {
        Uri uri = Uri.parse("mailto:" + "");
        List<ApplicationInfo> applicationInfoList = getPackageManager().getInstalledApplications(PackageManager.MATCH_UNINSTALLED_PACKAGES);//获取手机应用所有包名
        List<String> tempPkgNameList = new ArrayList<>();
        List<Intent> emailIntents = new ArrayList<>();
        for (ApplicationInfo info : applicationInfoList) {
            String pkgName = info.packageName;
            if (!tempPkgNameList.contains(pkgName)) {
                tempPkgNameList.add(pkgName);
                Intent intent = getPackageManager().getLaunchIntentForPackage(pkgName);
                emailIntents.add(intent);//添加邮箱类型应用
            }
        }
        if (!emailIntents.isEmpty()) {
            String[] email = {"xxxx@qq.com"};
            Intent intent = new Intent(Intent.ACTION_SENDTO, uri);
            intent.putExtra(Intent.EXTRA_EMAIL, email); // 收件人
            intent.putExtra(Intent.EXTRA_SUBJECT, "这是邮件的主题部分"); // 主题
            intent.putExtra(Intent.EXTRA_TEXT, "这是邮件的正文部分"); // 正文
            Intent chooserIntent = Intent.createChooser(intent, "意见反馈");
            if (chooserIntent != null) {
                startActivity(chooserIntent);
            } else {
                Log.d("openEmail","没有邮箱类型应用1");
            }
        } else {
            Log.d("openEmail","没有邮箱类型应用2");
        }
    }