ac01.java

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_06;
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class ac01 extends Activity implements OnClickListener {
    /** Called when the activity is first created. */
	private boolean init_state = false;
	Button btn, btn2;
	@Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        init_state = true;
        setContentView(R.layout.ac01);
        btn = (Button)findViewById(R.id.pu_btn);
        btn.setOnClickListener(this);
        btn2 = (Button)findViewById(R.id.exit_btn);
        btn2.setOnClickListener(this);
     }
   	 @Override
	    protected void onResume() {
	        super.onResume();
	        if(init_state)
	        	{ 
	        	  init_state = false;
	        	  return;
	        	}
	     SharedPreferences passwdfile = getSharedPreferences( 
                  "ITEM", 0); 
         String im = passwdfile.getString("ITEM", null); 
         TextView tv = (TextView)findViewById(R.id.tv);
         tv.setText("choice: " + im);		       
	    }
	    
public void onClick(View v) {
 	if (v == btn){
		Intent in = new Intent(ac01.this, pickup.class);
        startActivity(in);
       }
     if(v == btn2){
   		  this.finish();
         }
      }
 
}