无法解决错误

Question

只需尝试更改android应用程序选项卡上的文本。谁知道会有这么多麻烦。如何解决"无法解决"&amp无法解决或不是mTabHost、tabs_bg和tabsText 的字段错误

import android.app.Activity;
import android.content.Context;  
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.widget.TabHost;
import android.widget.TabHost.TabContentFactory;
import android.widget.TabHost.TabSpec;
import android.widget.TextView;
public class Tabs extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.tabs);
    mTabHost = (TabHost) findViewById(android.R.id.tabhost);
    setupTab(new TextView(this), "List");
    setupTab(new TextView(this), "Map");
}
private void setupTab(final View view, final String tag) {
    View tabview = createTabViewe(mTabHost.getContext(), tag);
    TabSpec setContent = mTabHost.newTabSpec(tag).setIndicator(tabview).setContent(new TabContentFactory() {
        public View createTabContent(String tag) {return view;}
    });
    mTabHost.addTab(setContent);
}
private static View createTabView(final Context context, final String text) {
    View view = LayoutInflater.from(context).inflate(R.layout.tabs_bg, null);
    TextView tv = (TextView) view.findViewById(R.id.tabsText);
    tv.setText(text);
    return view;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.tabs, menu);
    return true;
}

}

Answer 1

您需要声明mTabHost

TabHost mTabHost;
@Override
protected void onCreate(Bundle savedInstanceState) {

tabs_bg是一种布局。布局文件夹中有tabs_bg.xml吗。此外，您还需要检查tabs_bg.xml 中是否有id为tabsText的文本视图