checkBox判定

package com.yanjun;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.TextView;

public class MainActivity extends Activity {
  /** Called when the activity is first created. */

  TextView textView;
  Button button;
  CheckBox checkBox;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    textView = (TextView) findViewById(R.id.textView1);
    button = (Button) findViewById(R.id.button1);
    checkBox = (CheckBox) findViewById(R.id.checkBox1);
    //checkBox.setChecked(true);默認已選中
         checkBox.setChecked(true);
    button.setEnabled(false);
    button.setOnClickListener(new OnClickListener() {

      public void onClick(View v) {
        // TODO Auto-generated method stub
        if (checkBox.isChecked()) {
          textView.setText("點擊按鈕顯示內容");
          textView.setTextColor(Color.BLUE);
        }
      }
    });
    checkBox.setOnClickListener(new OnClickListener() {

      public void onClick(View v) {
        // 判斷選中狀態
        if (checkBox.isChecked()) {
          button.setEnabled(true);
          textView.setText("checkBox已選中，顯示按鈕");
          textView.setTextColor(Color.GREEN);
        } else {
          button.setEnabled(false);
          textView.setText("checkBox沒有選中，按鈕變灰");
          textView.setTextColor(Color.RED);
        }
      }
    });

  }
}