Intellij idea development of the first Android app

1. Create a project

File-->new Project --... -- >finish

2. Create a module

3, Myactivity.java

Package Com.example.myapp;

Import android.app.Activity;

Import Android.app.AlertDialog;

Import Android.os.Bundle;

Import Android.view.View;

Import Android.widget.Toast;

public class MyActivity extends Activity {

/**

* Called when the activity is first created.

*/

@Override

public void OnCreate (Bundle savedinstancestate) {

Super.oncreate (savedinstancestate);

Setcontentview (R.layout.main);

}

public void Onmybuttonclick (view view) {

Toast.maketext (This, " Hello! ", Toast.length_short). Show ();

}

public void Onmybutton2click (view view) {

Alertdialog.builder Builder = new Alertdialog.builder (myactivity.this);

Builder.settitle (" title ");

Builder.setpositivebutton (" OK ", null);

Builder.seticon (Android. R.drawable.ic_dialog_info);

Builder.setmessage (" Simple message box ");

Builder.show ();

}

}

4,layout-->main.xml (layout file)

<?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 world,my name is Liurui."
/>
<button
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
Android:text= "Button1 "
android:onclick= "Onmybuttonclick"
Android:id= "@+id/button" android:layout_gravity= "Center_horizontal"/>
<button
Android:layout_width= "Wrap_content"
android:layout_height= "Wrap_content"
Android:text= "Button2 "
android:onclick= "Onmybutton2click"
Android:id= "@+id/button2" android:layout_gravity= "Center_horizontal"/>
</LinearLayout>

5. Values-->strings.xml

<?xml version= "1.0" encoding= "Utf-8"?>

<resources>

<string name= "App_name" >myapp</string>

<string name= "Hello" >hello world! My name is liurui.</string>

</resources>

6, Gen-->r.java

/*___generated_by_idea___*/

Package Com.example.myapp;

/* This stub was only used by the IDE. It's not the R-class actually packed into the APK * *

Public final class R {

public static final class Attr {

}

public static final class Drawable {

public static final int icon=0x7f020000;

}

public static final class layout {

public static final int main=0x7f030000;

}

}

7. Operation

Run-->run'myapp'

Intellij idea development of the first Android app