Question

我尝试使用activity_main(xml)将MainActivity的布局从firebase(xml)更改为setContentView()。

问题是，即使我已将活动更改为firebase layout，活动开启时仍会显示activity_main布局。这是我的代码

在更改为firebase（xml）之前

public class MainActivity extends SimpleActivity {
  private FirebaseAuth mAuth;
  private EditText email, password;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    mAuth = FirebaseAuth.getInstance();

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

更改为firebase（xml）后

public class MainActivity extends SimpleActivity {
  private FirebaseAuth mAuth;
  private EditText email, password;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    mAuth = FirebaseAuth.getInstance();

    super.onCreate(savedInstanceState);
    setContentView(R.layout.firebase);
}

activity_main xml的XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:gravity="center">

firebase xml的XML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:gravity="center"
android:id="@+id/firebase"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.johnson.myapplication.MainActivity">

请注意这两个属性

xmlns:tools="http://schemas.android.com/tools"
tools:context="com.example.johnson.myapplication.MainActivity">

正式用于activity_main布局。我删除了它并将其添加到firebase布局属性

setContentView（）不改变布局

0 个答案: