Android学习笔记3 - Button & TextView

1、修改HelloWorld程序的main.xml文件，添加如下代码

2、修改HelloWordActivity.java文件，如下

public class HelloWorldActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        Button testbut = (Button)findViewById(R.id.button1);
        final TextView testView = (TextView)findViewById(R.id.view1);
        
        testbut.setOnClickListener(new Button.OnClickListener()
        {

            @Override
            public void onClick(View arg0) {
                testView.setText("Hello TextView!");
                testView.setBackgroundColor(Color.BLUE);
            }
        });
    }
}

3、运行程序，结果如下