Java 如何显示新布局

发布于09月29日

我有一个问题，我想要显示新布局并隐藏旧布局

my layout个我有这个登录页面，如图片所示，当你登录时，你将被重定向到新的布局，而旧的将隐藏

    public void Login(View v){

    EditText Name_input = findViewById(R.id.Name);
    String Name = Name_input.getText().toString();
    EditText Pass_input = findViewById(R.id.Pass);
    String Pass = Pass_input.getText().toString();

    if(Name.equals(Login_Name) && Pass.equals(Login_Pass)){
        TextView textView = findViewById(R.id.text);
        textView.setText("Login Succesful");
        textView.setTextColor(Color.parseColor("#00FF00"));

        //if succesful login create new layout and hide the login page
    }
    else{
        TextView textView = findViewById(R.id.text);
        textView.setText("Login Failed");
        textView.setTextColor(Color.parseColor("#FF0000"));
    }`

推荐答案

我会把这两个布局包装成LinearLayout和ContraintLayout，只要更适合你，添加一个ID，然后用visibility你可以隐藏和显示你想要的任何东西.

这是伪代码:

这将是layout.xml

<ConstraintLayout>
<LinearLayout
  ...
  id = view1>
<View/>
<View/>
<View/>
<View/>
</LinearLayout>
<LinearLayout
  ...
  id = view2>
<View/>
<View/>
<View/>
<View/>
</LinearLayout>
</ConstraintLayout>

这将是MainActivity.kt

if(wantToShowView1){
  binding.view1.isVisible = true
  binding.view2.isVisible = false
} else {
  binding.view2.isVisible = true
  binding.view1.isVisible = false
}

另一种方式是使用Fragments

这将是layout.xml

...
<FrameLayout
    android:id="@+id/fragment_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />
...

这将是MainActivity.kt

if (wantToShowView1) {
            supportFragmentManager.beginTransaction()
                .replace(R.id.fragment_container, Fragment1())
                .commit()
        } else {
            supportFragmentManager.beginTransaction()
                .replace(R.id.fragment_container, Fragment2())
                .commit()
        }