What is the way Android HelloWord is written?
What is the way Android HelloWord is written? I believe many inexperienced people don't know what to do about it. Therefore, this article summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.
I believe that people who have studied programming are still fresh in their memory of the way helloword programs are written in various languages. Here we will introduce you in detail about the way Android HelloWord is written to facilitate your understanding of the way this operating system is written.
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Let's first talk about what the whole program is going to do. Simple helloword displays the text Hello xiaoshengDAI in another acitvity by clicking a button.
Let's talk about the steps Android HelloWord does:
1. First of all, build a new project, my side is mainly to test Layout, so this is the name of the project.
two。 We need to display a button. When we click this button, we will go to another activity to display Hello xiaoshengDAI. The new class Layout is mainly used to display * activity or button.
1)。 Configure in the main.xml file
Java code
< ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android= "http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> < Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="来点我吧"/> < /LinearLayout> < ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android= "http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> < Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="来点我吧"/> < /LinearLayout>2)。 Set up monitoring and redirecting actiovity
Java code
Package com.layout
Import android.app.Activity
Import android.content.Intent
Import android.os.Bundle
Import android.view.View
Import android.view.View.OnClickListener
Import android.widget.Button
Public class Layout extends Activity {
/ * Called when the activity is first created. , /
@ Override
Public void onCreate (Bundle savedInstanceState) {
OnClickListener listener1 = null
Button botton1 = null
Listener1 = new OnClickListener () {
Public void onClick (View v) {
Intent intent0 = new Intent (Layout.this
ActivityFrameLayout.class)
SetTitle ("FrameLayout")
StartActivity (intent0)
}
}
Super.onCreate (savedInstanceState)
SetContentView (R.layout.main)
Botton1 = (Button) findViewById (R.id.button1)
Botton1.setOnClickListener (listener1)
}
}
Package com.layout
Import android.app.Activity
Import android.content.Intent
Import android.os.Bundle
Import android.view.View
Import android.view.View.OnClickListener
Import android.widget.Button
Public class Layout extends Activity {
/ * Called when the activity is first created. , /
@ Override
Public void onCreate (Bundle savedInstanceState) {
OnClickListener listener1 = null
Button botton1 = null
Listener1 = new OnClickListener () {
Public void onClick (View v) {
Intent intent0 = new Intent (Layout.this
ActivityFrameLayout.class)
SetTitle ("FrameLayout")
StartActivity (intent0)
}
}
Super.onCreate (savedInstanceState)
SetContentView (R.layout.main)
Botton1 = (Button) findViewById (R.id.button1)
Botton1.setOnClickListener (listener1)
}
}
3. In Android HelloWord writing, create a new activityFrameLayout class and activityFrameLayout.xml file
Java code
< ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android= "http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > < TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Hello xiaoshengDAI" /> < /LinearLayout> < ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android= "http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > < TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Hello xiaoshengDAI" /> < /LinearLayout>Java code
Package com.layout; import android.app.Activity; import android.os.Bundle; public class ActivityFrameLayout extends Activity {@ Override protected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); setTitle (""); setContentView (R.layout.activityframelayout);}} package com.layout; import android.app.Activity; import android.os.Bundle; public class ActivityFrameLayout extends Activity {@ Override protected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState) SetTitle (""); setContentView (R.layout.activityframelayout);}}
4. Configure AndroidManifest.xml to add the new Activity configuration file
Java code for Android HelloWord
< ?xml version="1.0" encoding="utf-8"?> < manifest xmlns:android= "http://schemas.android.com/apk/res/android" package="com.layout" android:versionCode="1" android:versionName="1.0"> < application android:icon="@drawable/icon" android:label="@string/app_name"> < activity android:name=".Layout" android:label="@string/app_name"> < intent-filter> < action android:name="android.intent.action.MAIN" /> < category android:name= "android.intent.category.LAUNCHER" /> < /intent-filter> < /activity> < activity android:name=".ActivityFrameLayout" android:label="activityFrameLayout"> < intent-filter> < action android:name="android.intent.action.MAIN" /> < category android:name= "android.intent.category.LAUNCHER" /> < /intent-filter> < /activity> < /application> < uses-sdk android:minSdkVersion="3" /> < /manifest> < ?xml version="1.0" encoding="utf-8"?> < manifest xmlns:android= "http://schemas.android.com/apk/res/android" package="com.layout" android:versionCode="1" android:versionName="1.0"> < application android:icon="@drawable/icon" android:label="@string/app_name"> < activity android:name=".Layout" android:label="@string/app_name"> < intent-filter> < action android:name="android.intent.action.MAIN" /> < category android:name= "android.intent.category.LAUNCHER" /> < /intent-filter> < /activity> < activity android:name=".ActivityFrameLayout" android:label="activityFrameLayout"> < intent-filter> < action android:name="android.intent.action.MAIN" /> < category android:name= "android.intent.category.LAUNCHER" /> < /intent-filter> < /activity> < /application> < uses-sdk android:minSdkVersion="3" /> < /manifest>5.Android HelloWord is ready to run. Hey, hey.
After reading the above, have you mastered how to write Android HelloWord? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!
