我的Android应用程序找不到XML文件中声明的按钮

Question

我的应用程序在读取XML对象之前工作正常，但现在我已经添加到两个按钮和textview，它找不到它们。

所以我在那里添加了三个对象以便更好地控制我的应用程序，而活动类找不到它们

public class TVListingTestActivity extends Activity implements OnClickListener 
{
private static final String TAG = "myApp";

private EditText infoView;
private String result;
private String full;

public int count;

final Context context =this;

private LinkedList<Widget> aList;
private LinkedList<String> stringList;
private LinkedList<Button> buttons;

private Button forwardDay;
private Button backDay;
private TextView display;

private int dayParse= 0;
private String tvListingURL;

@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    stringList = new LinkedList<String>();

    infoView= (EditText) findViewById(R.id.infoView);
    tvListingURL = "http://bleb.org/tv/data/rss.php?ch=bbc1_scotland&day="+dayParse;

    forwardDay=(Button)findViewById(R.id.forwardbutton);
    backDay=(Button)findViewById(R.id.backbutton);
    display=(TextView)findViewById(R.id.displayview);

资源似乎出现在R文件中，所以我无法理解问题所在。以前有没有人遇到这样的事情？

package org.me.myandroidstuff;

public final class R {
public static final class array {
    public static final int shows=0x7f040000;
}
public static final class attr {
}
public static final class drawable {
    public static final int icon=0x7f020000;
}
public static final class id {
    public static final int back=0x7f060002;
    public static final int cspinner=0x7f060007;
    public static final int dialog_info=0x7f060000;
    public static final int infoView=0x7f060003;
    public static final int main=0x7f060004;
    public static final int main_page=0x7f060006;
    public static final int mainll=0x7f060005;
    public static final int reminder=0x7f060001;
}
public static final class layout {
    public static final int dialog_info=0x7f030000;
    public static final int main=0x7f030001;
    public static final int main_page=0x7f030002;
}
public static final class string {
    public static final int app_name=0x7f050001;
    public static final int hello=0x7f050000;
}
}

Answer 1

从java文件中的导入中删除android.R。

Answer 2

检查R.java是否在布局类中包含“main”类。 R.java位于gen文件夹中。

Answer 3

两个按钮的ID和R.java中的TextView不是TVListingTestActivity类中的ID。确保它们在XML布局文件和R.java中相同，清理项目，然后正确初始化：

例如，应该从以下位置更改backDay按钮初始化：

backDay = (Button)findViewById(R.id.backbutton);

为：

backDay = (Button)findViewById(R.id.back);