empty activity

admin

1. package com.example.administrator.myapplication3;
   
2. 
   
3. import android.support.v7.app.AppCompatActivity;
   
4. import android.os.Bundle;
   
5. 
   
6. public class MainActivity extends AppCompatActivity {
   
7. 
   
8.     @Override
   
9.     protected void onCreate(Bundle savedInstanceState) {
   
10.         super.onCreate(savedInstanceState);
    
11.         setContentView(R.layout.activity_main);
    
12.     }
    
13. }
    

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admin

1. <?xml version="1.0" encoding="utf-8"?>
   
2. <manifest xmlns:android="http://schemas.android.com/apk/res/android"
   
3.     package="com.example.administrator.myapplication3">
   
4. 
   
5.     <application
   
6.         android:allowBackup="true"
   
7.         android:icon="@mipmap/ic_launcher"
   
8.         android:label="@string/app_name"
   
9.         android:roundIcon="@mipmap/ic_launcher_round"
   
10.         android:supportsRtl="true"
    
11.         android:theme="@style/AppTheme">
    
12.         <activity android:name=".MainActivity">
    
13.             <intent-filter>
    
14.                 <action android:name="android.intent.action.MAIN" />
    
15. 
    
16.                 <category android:name="android.intent.category.LAUNCHER" />
    
17.             </intent-filter>
    
18.         </activity>
    
19.     </application>
    
20. 
    
21. </manifest>

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admin

1. <?xml version="1.0" encoding="utf-8"?>
   
2. <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
   
3.     xmlns:app="http://schemas.android.com/apk/res-auto"
   
4.     xmlns:tools="http://schemas.android.com/tools"
   
5.     android:layout_width="match_parent"
   
6.     android:layout_height="match_parent"
   
7.     tools:context="com.example.administrator.myapplication3.MainActivity">
   
8. 
   
9.     <TextView
   
10.         android:layout_width="wrap_content"
    
11.         android:layout_height="wrap_content"
    
12.         android:text="Hello World!"
    
13.         app:layout_constraintBottom_toBottomOf="parent"
    
14.         app:layout_constraintLeft_toLeftOf="parent"
    
15.         app:layout_constraintRight_toRightOf="parent"
    
16.         app:layout_constraintTop_toTopOf="parent" />
    
17. 
    
18. </android.support.constraint.ConstraintLayout>
    

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admin

values 目录下：

colors.xml

1. <?xml version="1.0" encoding="utf-8"?>
   
2. <resources>
   
3. <color name="colorPrimary">#3F51B5</color>
   
4. <color name="colorPrimaryDark">#303F9F</color>
   
5. <color name="colorAccent">#FF4081</color>
   
6. </resources>

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strings.xml

1. <resources>
   
2.     <string name="app_name">My Application3</string>
   
3. </resources>

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styles.xml

1. <resources>
   
2. 
   
3.     <!-- Base application theme. -->
   
4.     <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
   
5.         <!-- Customize your theme here. -->
   
6.         <item name="colorPrimary">@color/colorPrimary</item>
   
7.         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
   
8.         <item name="colorAccent">@color/colorAccent</item>
   
9.     </style>
   
10. 
    
11. </resources>

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