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_04x;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

public class ac01 extends Activity implements OnClickListener {
    /** Called when the activity is first created. */
	  static final int PICKUP_REQUEST = 0;
	  LinearLayout layout;
	  TextView tv;
	  Button btn, btn2;
	  @Override
	  public void onCreate(Bundle icicle) {
	        super.onCreate(icicle);
	     	       
	        layout = new LinearLayout(this);
            LayoutParams lp = new LinearLayout.LayoutParams(
            		LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
            layout.setOrientation(LinearLayout.VERTICAL);
            
            tv = new TextView(this);
            layout.addView(tv, lp);
            
            btn = new Button(this);
            btn.setText("Pickup");
            btn.setTextColor(Color.RED);
            btn.setOnClickListener(this);
            layout.addView(btn, lp);
            
            btn2 = new Button(this);
            btn2.setText(" EXIT ");
            btn2.setOnClickListener(this);
            layout.addView(btn2, lp);
            setContentView(layout); 
	    }
		 
		 @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)
		                { 
		                  String data_str = (String)data.getCharSequenceExtra("DataKey");
		                  this.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.equals(btn2)){
		   		  this.finish();
		         }
		      }
		 
	}