Android-compatible Java Engineering 1.0

Android-compatible systems

Package Cn.com.likeshow;import Java.lang.reflect.constructor;import java.lang.reflect.InvocationTargetException; Import myvm.test.myactivity;/* * Author Zhang Zhang * * Time 2014-5-12 * */public class Activity {private Bundle Bundle;//savedi Nstancestate for activity See Transfer parameters protected void OnCreate (Bundle savedinstancestate) {this.bundle=savedinstancestate;} Protected Intent getintent () {return bundle.getintent ();} protected static Context Getapplicationcontext () {return null;} protected void StartActivity (Intent Intent) {//Create activity Activity=intent.getpreactivity () by reflection completion object; Class class1=intent.getafteractivity (); Constructor con=class1.getconstructors () [0]; try {activity activity2= (activity) con.newinstance ();//pass Bundele most parameters, call Getintent () The parameter activity2.oncreate (new bundle (intent)) passed between the activity is obtained from the Bundle. catch (Exception e) {e.printstacktrace ();}} protected void Setcontentview (int id) {System.out.println ("Setcontentview" + ID);} Protected Boolean Oncreateoptionsmenu (Menu menu) {return true;} ProtectedBoolean onoptionsitemselected (MenuItem Item) {return true;} Protected static class Toast{private Context applicationcontext;private static String s;private int t;private Toast (Conte XT ApplicationContext2, string string, int i) {this.applicationcontext=applicationcontext2;this.s=string;this.t=i;} public static Toast Maketext (Context applicationcontext,string String, int i) {//actual Android does not necessarily return toast object, this case is only used to simulate the Android implementation principle RET   Urn New Toast (applicationcontext,string,i);   } public static void show () {int len=s.length () +2; for (int i=0;i<len;i++) System.out.print ("*");  System.out.print ("\n*" +s+ "*\n"); for (int i=0;i<len;i++) System.out.print ("*");   System.out.println (); }}public static void Main (string[] args) {//For convenience, assuming the default startup MyActivity, of course, you can read the configuration file to know the default boot Activitynew myactivity (). OnCreate (new Bundle (null));}}

Package Cn.com.likeshow;public class Bundle {Private  Intent intent;public bundle (Intent Intent) {this.intent= Intent;} Public Intent getintent () {return Intent;} public void Setintent (Intent Intent) {this.intent = Intent;}}

Package Cn.com.likeshow;import Java.io.objectinputstream.getfield;import Java.util.hashmap;import java.util.Map; public class Intent {private map<string, object>map;private Activity activity;private class Class1;public Intent ( Activity activity, CLASS< Extends activity> Class1) {map=new hashmap<string, object> (); this.activity=activity;this.class1=class1;} public void PutExtra (String str,object obj) {map.put (str, obj);} Public Object Getextra (String str) {return  map.get (str);} Public activity getpreactivity () {return activity;} Public Class getafteractivity () {return class1;}}

========== Simple example Android code is as follows =========================================================

Package Myvm.test;import Cn.com.likeshow.activity;import Cn.com.likeshow.bundle;import cn.com.likeshow.Intent; public class MyActivity extends Activity {@Overridepublic void onCreate (Bundle savedinstancestate) {super.oncreate ( Savedinstancestate); System.out.println ("myactivity start"); Setcontentview (1); Toast.maketext (Getapplicationcontext (), "haha toast", 0). Show (); Intent intent=new Intent (Myactivity.this, Secondactivity.class); Intent.putextra ("MyActivity", "Hello 2activity"); StartActivity (intent); Toast.maketext (Getapplicationcontext (), "secondactivity start Complete", 0). Show (); Intent intent2=new Intent (Myactivity.this, Thirdactivity.class); Intent2.putextra ("1", "Hello 3activity"); StartActivity (Intent2); Toast.maketext (Getapplicationcontext (), "thirdactivity start Complete", 0). Show ();}}

Package Myvm.test;import Cn.com.likeshow.activity;import Cn.com.likeshow.bundle;import cn.com.likeshow.Intent; public class Secondactivity extends activity{@Overrideprotected void OnCreate (Bundle savedinstancestate) { Super.oncreate (savedinstancestate); System.out.println ("secondactivity start"); Setcontentview (2); Intent intent=getintent (); Object Object=intent.getextra ("myactivity"); Object Object2=intent.getextra ("1"); System.out.println ("secondactivity" +object); System.out.println ("secondactivity" +object2); Toast.maketext (Getapplicationcontext (), "Secondactivity execution Complete", 0). Show ();}}

Package Myvm.test;import Cn.com.likeshow.activity;import Cn.com.likeshow.bundle;import cn.com.likeshow.Intent; public class Thirdactivity extends Activity {@Overrideprotected void onCreate (Bundle savedinstancestate) { Super.oncreate (savedinstancestate); System.out.println ("thirdactivity start"); Setcontentview (3); Intent intent=getintent (); Object Object=intent.getextra ( "MyActivity"); Object Object2=intent.getextra ("1"); System.out.println ("thirdactivity" +object); System.out.println ("thirdactivity" +object2); Toast.maketext (Getapplicationcontext (), "Thirdactivity execution Complete", 0). Show ();}}

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