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_05;
import android.app.Activity;
import android.content.Intent;
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. */
	static final int PICKUP_REQUEST = 0;
	//TextView tv;
	Button btn, btn2;
	@Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        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 onActivityResult(int requestCode, int resultCode,Intent data)
    {
	        if (requestCode == PICKUP_REQUEST) {
            if (resultCode == RESULT_CANCELED) 
                    setTitle("Canceled...");
                else if(resultCode == RESULT_OK)
                {
                  TextView tv = (TextView)findViewById(R.id.tv);
                  String data_str = (String)data.getCharSequenceExtra("DataKey");
                  tv.setText("choice: " + data_str);
                }
            }
    }

public void onClick(View v) {
 	if (v == btn){
		Intent in = new Intent(ac01.this, pickup.class);
        startActivityForResult(in,PICKUP_REQUEST);
       }
     if(v == btn2){
   		  this.finish();
         }
      }
 
}