Question

[需要帮助。如何在工具栏中使用警报对话框执行注销？因为我希望在用户想要注销到他的帐户时显示警告对话框。我正处于学习的阶段。希望你能帮我们嘿嘿。这是我的注销活动的代码::] [1] [2]

  [1]: https://i.stack.imgur.com/lU7i1.png




   @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            getMenuInflater().inflate(R.menu.menu, menu);
            return super.onCreateOptionsMenu(menu);
        }

        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            int id = item.getItemId();
            AlertDialog.Builder alert = new AlertDialog.Builder(MainActivity.this);
            alert.setMessage("Are you sure?")
                    .setPositiveButton("Logout", new DialogInterface.OnClickListener() {

                        public void onClick(DialogInterface dialog, int which) {

                        }
                    }).setNegativeButton("Cancel", null);

            AlertDialog alert1 = alert.create();
            alert1.show();
            if (id == R.id.action_settings) {
                logout();
                return true;
            }
            return super.onOptionsItemSelected(item);
        }

        private void logout() {
            startActivity(new Intent(this, LoginActivity.class));
            finish();
        }

Answer 1

你需要考虑算法结构。

首先，用户单击选项菜单并选择注销。

然后，显示弹出窗口。

最后，用户与此弹出窗口进行交互并验证注销。

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        // This is first step.
        showPopup(); 
        return true;
    }
    return super.onOptionsItemSelected(item);
}

// first step helper function
private void showPopup() {
    AlertDialog.Builder alert = new AlertDialog.Builder(MainActivity.this);
    alert.setMessage("Are you sure?")
            .setPositiveButton("Logout", new DialogInterface.OnClickListener()                 {

                public void onClick(DialogInterface dialog, int which) {

                    logout(); // Last step. Logout function

                }
            }).setNegativeButton("Cancel", null);

    AlertDialog alert1 = alert.create();
    alert1.show();
}

private void logout() {
    startActivity(new Intent(this, LoginActivity.class));
    finish();
}

使用工具栏内的警告对话框显示注销

1 个答案: