兼容安卓的java工程1.0
//兼容安卓的系统
package cn.com.likeshow; import java.lang.reflect.Constructor; import java.lang.reflect.InvocationTargetException; import myvm.test.myActivity; /* * author 张章 * * time 2014-5-12 * */ public class Activity { private Bundle bundle; //savedInstanceState用于activity见传递参数 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) { //通过反射完成对象创建 Activity activity=intent.getPreActivity(); Class class1=intent.getAfterActivity(); Constructor con=class1.getConstructors()[0]; try { Activity activity2=(Activity) con.newInstance(); //把Bundele最为参数传入,调用getIntent()时会从bundle中获取activity间传递的参数 activity2.onCreate(new Bundle(intent)); } catch (Exception e) { e.printStackTrace(); } } protected void setContentView(int id) { System.out.println("setContentView " + id); } protected boolean onCreateOptionsMenu(Menu menu) { return true; } protected boolean onOptionsItemSelected(MenuItem item) { return true; } protected static class Toast { private Context applicationContext; private static String s; private int t; private Toast(Context applicationContext2, String string, int i) { this.applicationContext=applicationContext2; this.s=string; this.t=i; } public static Toast makeText(Context applicationContext,String string, int i) { //实际安卓中不一定是返回Toast对象,该事例只用于模拟安卓实现原理 return 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) { //方便起见,假定默认启动myActivity,当然可以通过读取配置文件,知道默认启动的Activity new 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; } }
//==========简易示例安卓代码如下=========================================================
package myvm.test; import cn.com.likeshow.Activity; import cn.com.likeshow.Bundle; import cn.com.likeshow.Intent; public class myActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); System.out.println("myActivity 启动"); setContentView(1); Toast.makeText(getApplicationContext(),"哈哈Toast",0).show(); Intent intent=new Intent(myActivity.this, SecondActivity.class); intent.putExtra("myActivity", "hello 2activity"); startActivity(intent); Toast.makeText(getApplicationContext(),"SecondActivity启动完毕",0).show(); Intent intent2=new Intent(myActivity.this, ThirdActivity.class); intent2.putExtra("1", "hello 3activity"); startActivity(intent2); Toast.makeText(getApplicationContext(),"ThirdActivity启动完毕",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{ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); System.out.println("SecondActivity 启动"); 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执行完毕",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 { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); System.out.println("ThirdActivity 启动"); 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执行完毕",0).show(); } }
==========效果图 =================
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