package com.ww.n1.n1_helloworld;
import android.app.Activity;
import android.os.Bundle;
import android.support.annotation.Nullable;
public class HelloWorldActivity extends Activity{
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_helloworld);
}
}
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.ww.n1.n1_helloworld">
<application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme">
<activity android:name=".HelloWorldActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
</manifest>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent">
<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World" />
</LinearLayout>