android从自己的应用打开邮箱和QQ

/**
     * 发动邮件
     * @param context
     */
    public static void sendEmail(Context context) {
        Intent intent = new Intent(Intent.ACTION_SEND);
        intent.setType("plain/text");
        intent.putExtra(Intent.EXTRA_EMAIL, new String[]{"[email protected]"});
        intent.putExtra(Intent.EXTRA_SUBJECT, "github");
        intent.putExtra(Intent.EXTRA_TEXT, "coding for fun!");
        try {
            if (!(context instanceof Activity)) {
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            }
            context.startActivity(intent);
        } catch (android.content.ActivityNotFoundException ex) {
            Toast.makeText(context, "未安装邮箱应用！", Toast.LENGTH_SHORT).show();
        }
    }

注意：这里的Intent intent = new Intent(Intent.ACTION_SENDTO)，写成这样子会出现错误。

    /**
     * 打开QQ
     * @param context
     */
    public static void gotoQQ(Context context) {
        try {
            Intent intent = new Intent();
            intent.setAction(Intent.ACTION_MAIN);
            intent.addCategory(Intent.CATEGORY_LAUNCHER);
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.setComponent(new ComponentName("com.tencent.mobileqq", "com.tencent.mobileqq.activity.SplashActivity"));
            if (!(context instanceof Activity)) {
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            }
            context.startActivity(intent);
        } catch (Exception e) {
            e.printStackTrace();
            Toast.makeText(context, "未安装QQ", Toast.LENGTH_SHORT).show();
        }
    }