ex12.java

来自「Google Android应用框架原理与程序设计 第三版(中文高清PDF)高焕」· Java 代码 · 共 65 行

package com.misoo.ex12;
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.widget.Button;
import android.widget.LinearLayout;

public class ex12 extends Activity {
    /** Called when the activity is first created. */
	private final int WC = LinearLayout.LayoutParams.WRAP_CONTENT; 
   	private LinearLayout layout;
	LinearLayout.LayoutParams para;
	static final int RG_REQUEST = 0;
	private int mColor = Color.YELLOW;
	
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
      
        layout = new LinearLayout(this);
        layout.setOrientation(LinearLayout.VERTICAL);
        para = new LinearLayout.LayoutParams(230, 140); 
        DrawView dv = new DrawView(this);
        layout.addView(dv, para);
        
        Button btn = new Button(this);
        btn.setText("Change Color");
        btn.setOnClickListener(listener);
        para = new LinearLayout.LayoutParams(WC, WC); 
        layout.addView(btn, para);
        setContentView(layout);
    }
    public int getColor()
    {
    	return mColor;
    }
    
    private OnClickListener listener = new OnClickListener()
	 {
	 	public void onClick(View v) {
	 		Intent in = new Intent(ex12.this, rgActivity.class);
        	startActivityForResult(in,RG_REQUEST);
         } 
	   };
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data)
	    {
		        if (requestCode == RG_REQUEST) {
	            if (resultCode == RESULT_CANCELED) 
	                    setTitle("Canceled...");
	                else if(resultCode == RESULT_OK)
	                { 
	                  String data_str = (String)data.getCharSequenceExtra("DataKey");
	                  setTitle(data_str);
	                  if(data_str.contains("Y"))
	                	    mColor = Color.YELLOW;
	                  else  
	                	    mColor = Color.BLUE;
		             }
	            }
	    }
}