<?xml version="1.0" encoding="utf-8"?>  
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    xmlns:app="http://schemas.android.com/apk/res-auto"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    android:background = "@mipmap/bc"  
    tools:context=".MainActivity">  
    <TextView  
        android:id="@+id/one"  
        android:layout_width="200dp"  
        android:layout_height="100dp"  
        android:layout_centerInParent="true"  
        />  
    <Button  
        android:id="@+id/button"  
        android:layout_width="299dp"  
        android:layout_height="63dp"  
        android:layout_below="@+id/one"  
        android:layout_centerHorizontal="true"  
        android:layout_marginTop="87dp"  
        android:text="你這背景太假了"  
        tools:ignore="MissingConstraints" />  
</RelativeLayout>  

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background = "@mipmap/ck"
    tools:context=".MainActivity">
 
    <TextView
        android:id="@+id/two"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="這是第二個頁面!"
        android:textSize="25dp"
        android:textColor="#663399"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
 
</LinearLayout>

public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        //獲取按鈕
        Button button = (Button) findViewById(R.id.button);
 
        //按鈕進行監(jiān)聽
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //監(jiān)聽按鈕，如果點擊，就跳轉(zhuǎn)
                Intent intent = new Intent();
                //前一個（MainActivity.this）是目前頁面，后面一個是要跳轉(zhuǎn)的下一個頁面
                intent.setClass(MainActivity.this,Sencond.class);
                startActivity(intent);
            }
        });
    }
}
 

public class Sencond extends AppCompatActivity { 
        @Override  
        protected void onCreate(Bundle savedInstanceState) {  
            super.onCreate(savedInstanceState);  
            //這個是獲取布局文件的，這里是你下一個頁面的布局文件//注意這個是跳轉(zhuǎn)界面的不能設(shè)置錯，應(yīng)該是第一個  
                setContentView(R.layout.sencond);  
        }  
    }  

Error:Error: 'O' is not a valid file-based resource name character: File-based resource names must contain only lowercase a-z, 0-9, or underscore
Error:Execution failed for task ':bluetooth:mergeDebugResources'.
 F:\Android_Studio_Project\BLE_APP\bluetooth\src\main\res\layout\automaticOpenLayout.xml: Error: 'O' is not a valid file-based resource name character: File-based resource names must contain only lowercase a-z, 0-9, or underscore
F:\Android_Studio_Project\BLE_APP\bluetooth\src\main\res\layout\automaticOpenLayout.xml