我是Android新手。我已经下载了一些代码来运行,但有问题:Android helloWorld带按钮
package t.t.t4;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class Test4Activity extends Activity {
/** Called when the activity is first created. */
OnClickListener listener1 = null;
Button button1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
listener1 = new OnClickListener() {
public void onClick(View v) {
TextView text_view = (TextView) findViewById(R.id.TextView01);
CharSequence text_view_old = text_view.getText();
text_view.setText("Before: "+ text_view_old +"\nAdded information: Hello World again !");
}
};
setContentView(R.layout.main);
button1 = (Button) findViewById(R.id.Button01);
button1.setOnClickListener(listener1);
}
}
R.id.TextView01
是有错误的行。 R和R.id的含义是什么?
把你的main.xml放在这里。 – 2012-02-24 07:18:28
你可以请这里的错误? – 2012-02-24 07:18:41
您是否阅读过[XML布局](http://developer.android.com/guide/topics/ui/declaring-layout.html)指南? – 2012-02-24 07:18:47