f041bf006d76001d1a71cc5950778c7a

Google Android应用框架原理与程序设计 第三版(中文高清PDF)高焕堂

package com.misoo.ex01_01;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class ac01 extends Activity {
	 
	    public static final int PICKUP_ID = Menu.FIRST;
	    public static final int SHOW_ID = Menu.FIRST + 1;

	    @Override
	    public void onCreate(Bundle icicle) {
	        super.onCreate(icicle);
	        setContentView(R.layout.main);
	    }
		@Override
		 public boolean onCreateOptionsMenu(Menu menu) {
		        super.onCreateOptionsMenu(menu);
		        menu.add(0, PICKUP_ID, 0, "Pick Up  An Item");
		        menu.add(1, SHOW_ID, 1, "Show Result");
		        return true;
		 }
		 @Override
		    public boolean onOptionsItemSelected(MenuItem item) {
		        switch (item.getItemId()) {
		        case PICKUP_ID:
		          	Intent in = new Intent(ac01.this, pickup.class);
		        	startActivity(in);
		            return true;
		        case SHOW_ID:
		        	 SharedPreferences passwdfile = getSharedPreferences( 
		                     "ITEM", 0); 
		             String im = passwdfile.getString("ITEM", null); 
		             TextView tv = (TextView)findViewById(R.id.tv);
		             tv.setText("choice: " + im);
 		            return true;
		        }
		        return super.onOptionsItemSelected(item);
		    }
}